Space temperature distribution measuring mechanism

Abstract

The invention discloses a space temperature distribution measuring mechanism in the technical field of space evaporation heat transfer, which comprises a displacement mechanism and a temperature measuring device fixedly mounted on the displacement mechanism, and the displacement mechanism can drive the temperature measuring device to linearly move. And the linear movement direction is perpendicular to a base plane, used for forming liquid drops, of the evaporation table, so that the temperatures of gas-liquid interfaces at different positions are measured. The displacement mechanism can drive the temperature measuring device to linearly move, the linear movement direction is perpendicular to the base plane, used for forming liquid drops, of the evaporation table, and the distance between the first temperature sensor in the temperature measuring device and the base of the evaporation table can be adjusted, namely, the position of the first temperature sensor on a gas-liquid interface is adjusted; the temperature of the gas-liquid interface at different positions is comprehensively measured, and sufficient data support is provided for studying the discontinuous (jumping) change rule of temperature distribution in the normal direction of the evaporation gas-liquid interface.

Description

Technical Field

[0001] This invention relates to the field of space evaporation heat transfer technology, specifically to a space temperature distribution measurement mechanism and a gas-liquid interface temperature jump experimental system. Background Technology

[0002] The biggest difference between space science experiments and ground science experiments lies in the different environments they take place in. Under microgravity conditions, phenomena such as buoyancy convection, gravity settling, and liquid pressure gradients in fluids caused by the original ground gravity effect basically disappear. Some secondary effects masked by the ground gravity effect become prominent, and fluid morphology and physicochemical processes undergo significant changes, which will affect flow and heat transfer mechanisms, as well as the processing and preparation of related materials. At the same time, since some basic physics experiments are no longer affected by gravity, experiments can be carried out with higher indicators and precision, and important basic physics theories can be verified.

[0003] Evaporation and condensation are ubiquitous phenomena in nature, and their phase change heat transfer (heat transfer during liquid boiling and steam condensation) process is a classic problem that physics has long studied. For example, water evaporation and precipitation (condensation) are the basic guarantees for maintaining the human living environment on Earth. This cycle is greatly affected by natural (buoyancy) convection caused by gravity at every moment. On Earth, such evaporation and convection affect human production and life. For example, heat exchangers such as air conditioners and heat pipes are designed using the principle of phase change heat transfer.

[0004] The microgravity environment in spacecraft (such as manned space stations and satellites) lacks natural convection, which greatly affects the evaporation and condensation phase change processes. The working environment of thermal equipment will also be completely different from that on Earth. In order to study this difference, it is necessary to conduct scientific experiments on space evaporation and condensation phase change heat transfer in the microgravity environment. Through these experiments, we can study the special phenomena of space phase change heat transfer, understand its special laws, and then master new methods and technologies to overcome the adverse effects of space phase change heat transfer, so as to develop thermal equipment that can be well adapted to the space environment.

[0005] In space experiments, to study the discontinuous (jumping) temperature distribution at the normal direction of the evaporating gas-liquid interface, multiple temperature sensors are usually set up along the normal direction of the gas-liquid interface to measure the temperature at different locations. However, since the temperature sensors are fixed and there are intervals between adjacent temperature sensors, the measurement results are not comprehensive enough. Summary of the Invention

[0006] The purpose of this invention is to provide a spatial temperature distribution measurement mechanism to solve the technical problem that in the prior art, temperature sensors are fixed and there are gaps between adjacent temperature sensors, resulting in incomplete measurement results.

[0007] To address the aforementioned technical problems, the present invention specifically provides a spatial temperature distribution measurement mechanism, comprising a displacement mechanism and a temperature measuring device fixedly mounted on the displacement mechanism. The displacement mechanism is capable of driving the temperature measuring device to move linearly, and the direction of linear movement is perpendicular to the base plane of the evaporation stage used to form droplets, so as to measure the gas-liquid interface temperature at different locations.

[0008] In a preferred embodiment of the present invention, both the displacement mechanism and the temperature measuring device are installed in a sealed evaporation liquid pool.

[0009] As a preferred embodiment of the present invention, the temperature measuring device comprises a temperature measuring bracket, a temperature measuring rod, and a first temperature sensor. The temperature measuring bracket is fixedly installed on the displacement mechanism, and the temperature measuring rod is fixedly installed on the side of the temperature measuring bracket near the evaporation platform. The length direction of the temperature measuring rod is consistent with the linear movement direction of the temperature measuring device. At least two first temperature sensors are provided on the temperature measuring rod along its length direction to simultaneously measure the gas-liquid interface temperature at multiple locations.

[0010] As a preferred embodiment of the present invention, multiple first temperature sensors are provided on the temperature measuring rod, and the spacing between adjacent first temperature sensors gradually decreases along the direction close to the evaporation platform to adapt to changes in the temperature gradient at the gas-liquid interface.

[0011] In a preferred embodiment of the present invention, the displacement mechanism includes a slide table and a slider mounted on the slide table, the temperature measuring bracket is fixedly mounted on the slider, and the slider can drive the temperature measuring bracket to move linearly.

[0012] As a preferred embodiment of the present invention, a light source device is further provided between the displacement mechanism and the evaporation stage. The light source device is used to provide a light source for the evaporation stage to observe the morphology and formation pattern of the droplets.

[0013] To solve the above-mentioned technical problems, the present invention further provides a gas-liquid interface temperature jump experimental system, including an evaporation platform and the above-mentioned spatial temperature distribution measuring mechanism, wherein the evaporation platform and the spatial temperature distribution measuring mechanism are both arranged in a closed evaporation liquid pool.

[0014] The evaporation platform includes a base for forming droplets, a heat flow sensor for measuring changes in heat flow at the bottom of the droplets, a top seat for supporting the base, and a heating device for heating the base, arranged sequentially in a direction away from the temperature measuring device.

[0015] The base has a liquid injection hole, the heat flow sensor has a sensing hole, and the top seat has a liquid inlet pipe. The liquid injection hole, the sensing hole, and the liquid inlet pipe are all connected, and the end of the liquid inlet pipe away from the sensing hole is connected to a liquid injection connector to provide liquid to the base for forming droplets.

[0016] As a preferred embodiment of the present invention, a plurality of second temperature sensors are also installed on the side of the top seat. The second temperature sensors are used to measure the temperature at different positions on the bottom surface of the droplet inside the base, so as to reflect the influence of evaporation effect and thermocapillary convection on the heat transfer characteristics inside the droplet.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] The displacement mechanism can drive the temperature measuring device to move linearly, and the direction of linear movement is perpendicular to the base plane of the evaporation stage used to form droplets. It can adjust the distance between the first temperature sensor in the temperature measuring device and the base of the evaporation stage, that is, adjust the position of the first temperature sensor at the gas-liquid interface, so as to comprehensively measure the temperature of the gas-liquid interface at different positions, and provide sufficient data support for studying the discontinuous (jump) change law of temperature distribution in the normal direction of the evaporation gas-liquid interface. Attached Figure Description

[0019] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a compact, movable space temperature distribution measurement mechanism suitable for use in a closed liquid tank, provided by the present invention, in one direction.

[0021] Figure 2 This is a schematic diagram of another direction of the compact, movable space temperature distribution measurement mechanism provided by the present invention, which is suitable for use in a closed liquid pool.

[0022] Figure 3 This is an assembly diagram of an evaporation device, a limiting mechanism, a displacement mechanism, a temperature measuring mechanism, a light source device, and a pressure plate provided by the present invention.

[0023] Figure 4 yes Figure 3 A magnified view of a portion of point A in another direction;

[0024] Figure 5This is a schematic diagram of the arrangement of multiple first temperature sensors on a temperature measuring rod provided by the present invention;

[0025] Figure 6 This is an assembly diagram of an evaporation device, a displacement mechanism, a temperature measuring mechanism, a light source device, and a pressure plate provided by the present invention;

[0026] Figure 7 This is an assembly diagram of a displacement mechanism, a temperature measuring mechanism, and a pressure plate provided by the present invention;

[0027] Figure 8 This is an assembly diagram of a limiting mechanism, a displacement mechanism, a temperature measuring mechanism, a light source device, and a pressure plate provided by the present invention. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] This embodiment provides a compact, movable space temperature distribution measurement mechanism suitable for use in a closed liquid pool. It includes a displacement mechanism 1, a limiting mechanism 2, and an evaporation device 3. The displacement mechanism 1 and the evaporation device 3 are arranged opposite to each other, and the limiting mechanism 2 is located between the displacement mechanism 1 and the evaporation device 3. The displacement mechanism 1 includes a slide table 11 and a slider 12 slidably connected to the slide table 11. A temperature measuring device 4 is located on the side of the slider 12 away from the slide table 11. Part of the temperature measuring device 4 passes through the limiting mechanism 2. The slider 12 drives the temperature measuring device 4 to reciprocate along the direction X pointing from the evaporation device 3 towards the displacement mechanism 1. The temperature measuring device 4 includes a temperature measuring bracket 41 and a temperature measuring rod 42 connected to the temperature measuring bracket 41. The temperature measuring rod 42 is located on the side of the temperature measuring bracket 41 closer to the evaporation device 3, and the length extension direction of the temperature measuring rod 42 is the same as the length extension direction of the temperature measuring bracket 41. The temperature measuring bracket 41 is connected to the slider 12.

[0030] The evaporation device 3 includes an evaporation platform 31, which includes a base 310 for forming droplets. The base 310 faces the limiting mechanism 2. The width extension direction of the base 310 along the thickness direction Z of the slider 12 is perpendicular to the length extension direction of the slider 12. At least two first temperature sensors 421 are provided on the temperature measuring rod 42. The at least two first temperature sensors 421 are arranged along the direction X of the evaporation device 3 pointing towards the displacement mechanism 1. The first temperature sensors 421 are used to measure the gas-liquid interface temperature in the base 310. When the slider 12 drives the temperature measuring rod 42 to reciprocate along the direction X of the evaporation device 3 pointing towards the displacement mechanism 1, the gas-liquid interface temperature at different positions between the base 310 and the limiting mechanism 2 is measured.

[0031] Specifically, the compact, movable space temperature distribution measurement mechanism suitable for use within a sealed liquid tank can be a compact, movable space temperature distribution measurement mechanism, applicable to space stations. More specifically, this compact, movable space temperature distribution measurement mechanism is suitable for microgravity environments in space. The compact, movable space temperature distribution measurement mechanism can be installed inside a sealed liquid tank. When the sealed liquid tank includes a housing, the compact, movable space temperature distribution measurement mechanism is directly installed inside the housing. Of course, depending on the actual situation, the compact, movable space temperature distribution measurement mechanism can also be directly mounted on other objects. This embodiment does not impose specific limitations; this example only illustrates the installation of the compact, movable space temperature distribution measurement mechanism inside a sealed liquid tank.

[0032] Continue to refer to Figures 1-4 As shown, the compact movable space temperature distribution measurement mechanism suitable for use in a closed liquid pool includes a displacement mechanism 1, a limiting mechanism 2, and an evaporation device 3. The displacement mechanism 1 and the evaporation device 3 can be arranged opposite each other, and the limiting mechanism 2 is located between the displacement mechanism 1 and the evaporation device 3. It can be understood that the displacement mechanism 1, the limiting mechanism 2, and the evaporation device 3 are arranged opposite each other in pairs. The displacement mechanism 1 is used to carry and guide the temperature measuring device 4 to make reciprocating linear motion in a given direction; the limiting mechanism 2 is used to limit the displacement mechanism 1 from deviating during the reciprocating linear motion; and the evaporation device 3 is used to provide a liquid droplet evaporation experimental platform.

[0033] The displacement mechanism 1 includes a slide table 11 and a slider 12 slidably connected to the slide table 11. The cross-section of the slide table 11 is concave along the thickness direction Z of the slider 12 so that the slider 12 can be located inside the slide table 11. The slider 12 and the slide table 11 are slidably connected. The slide table 11 is used to provide support and guidance for the slider 12. The length extension direction of the slide table 11 along the direction X of the evaporation device 3 pointing to the displacement mechanism 1 is the same as the length extension direction of the slider 12 along the direction X of the evaporation device 3 pointing to the displacement mechanism 1. The slider 12 can make linear reciprocating motion within the slide table 11 along the direction X of the evaporation device 3 pointing to the displacement mechanism 1. The slider 12 can be a driving component, such as a cylinder. A temperature measuring device 4 is installed on the side of the slider 12 away from the slide table 11. The temperature measuring device 4 is used to measure the gas-liquid interface temperature of the evaporation device 3. The temperature measuring device 4 and the slider 12 can be fixedly connected, such as by bolts. The temperature measuring device 4 passes through the limiting mechanism 2 on the side of the evaporation device 3 that is close to the displacement mechanism 1 in the direction X of the evaporation device 3. The slider 12 can drive the temperature measuring device 4 to make linear reciprocating motion in the direction X of the evaporation device 3 that is close to the displacement mechanism 1.

[0034] The temperature measuring device 4 includes a temperature measuring bracket 41 and a temperature measuring rod 42 connected to the temperature measuring bracket 41. The temperature measuring rod 42 is located on the side of the temperature measuring bracket 41 closer to the evaporation device 3, so that the first temperature sensor 421 can be installed on the temperature measuring rod 42, which is beneficial for measuring the gas-liquid interface temperature of the evaporation device 3. The length extension direction of the temperature measuring rod 42 is the same as the length extension direction of the temperature measuring bracket 41. Along the direction X from the evaporation device 3 to the displacement mechanism 1, the length of the temperature measuring bracket 41 can be greater than the length of the temperature measuring rod 42, so that the temperature measuring bracket 41 is more firmly fixed to the slider 12. When the space station is running at high speed, it can also avoid the risk of separation between the temperature measuring device 4 and the slider 12, ensuring that the temperature measuring device 4 is firmly fixed on the slider 12. Along the length direction Y of the limiting mechanism 2, the width of the temperature measuring bracket 41 can be less than the width of the slider 12, which can avoid the width of the temperature measuring bracket 41 being too wide along the length direction Y of the limiting mechanism 2. This not only fixes the temperature measuring bracket 41 to the slider 12, but also avoids occupying too much space, and at the same time helps to reduce costs. The temperature measuring bracket 41 and the slider 12 can be detachably fixedly connected, such as by threaded connection, which has the advantages of simple structure, reliable connection and convenient installation and removal.

[0035] The evaporation apparatus 3 includes an evaporation platform 31, which provides an experimental platform for droplets to evaporate. This facilitates the subsequent study of discontinuous (jumping) temperature distribution at the gas-liquid interface in the normal direction, and other thermodynamic non-equilibrium effects at the phase transition interface. The evaporation platform 31 includes a base 310, which faces the limiting mechanism 2. The base 310 is used to form droplets. The base 310 can be made of silver, polytetrafluoroethylene (PTFE), polymethyl methacrylate (PMMA), silicon, or graphite. The material of the base 310 can be selected according to the actual situation, and this embodiment does not impose specific limitations on it. It should be noted that the evaporation rate of the droplets will vary depending on the material of the base 310.

[0036] The plane of the evaporation platform 31 along the thickness direction Z of the slider 12 is perpendicular to the length extension direction of the temperature measuring device 4. Similarly, the plane of the base 310 along the thickness direction Z of the slider 12 is perpendicular to the length extension direction of the temperature measuring rod 42. This is beneficial for studying the discontinuous (jumping) temperature distribution at the gas-liquid interface and other thermodynamic non-equilibrium effects at the phase transition interface. Multiple first temperature sensors 421 are installed on the temperature measuring rod 42. These sensors are arranged sequentially along the direction X from the evaporation device 3 towards the displacement mechanism 1. The gas-liquid interface temperature is measured using the first temperature sensors 421. Optionally, the first temperature sensor 421 can be a thermocouple, specifically a TE-12167 model. The thermocouple model can be adjusted according to actual conditions; this embodiment does not impose specific limitations. The temperature measurement range of the thermocouple can be -200℃ to +350℃. In this embodiment, the diameter of the thermocouple can be selected from 25μm to 250μm. For example, the diameter of the thermocouple can be 25μm, 50μm, 75μm, 100μm, 125μm, 150μm, 175μm, 200μm, 225μm, or 250μm. Preferably, the diameter range of the thermocouple is 75μm-150μm. When the slider 12 drives the temperature measuring rod 42 to move linearly back and forth along the direction X pointing to the displacement mechanism 1 of the evaporation device 3, the multiple first temperature sensors 421 can measure the gas-liquid interface temperature at different positions between the base 310 and the limiting mechanism 2.

[0037] Compared with the prior art, the compact, movable space temperature distribution measurement mechanism for closed liquid pools provided in this embodiment achieves at least the following beneficial effects:

[0038] This embodiment provides a compact, movable space temperature distribution measurement mechanism suitable for use in a closed liquid tank. It includes a displacement mechanism 1, a limiting mechanism 2, and an evaporation device 3. The displacement mechanism 1 and the evaporation device 3 are arranged opposite to each other, and the limiting mechanism 2 is located between the displacement mechanism 1 and the evaporation device 3. The displacement mechanism 1 includes a slide table 11 and a slider 12 slidably connected to the slide table 11. A temperature measuring device 4 is located on the side of the slider 12 away from the slide table 11. The temperature measuring device 4 passes through the limiting mechanism 2. The slider 12 drives the temperature measuring device 4 to reciprocate along the direction X of the evaporation device 3 towards the displacement mechanism 1. The temperature measuring device 4 includes a temperature measuring bracket 41 and a temperature measuring rod 42 connected to the temperature measuring bracket 41. The temperature measuring rod 42 is located on the side of the temperature measuring bracket 41 closer to the evaporation device 3, and the length extension direction of the temperature measuring rod 42 is the same as the length extension direction of the temperature measuring bracket 41. The temperature measuring bracket 41 is connected to the slider 12. The evaporation device 3 includes an evaporation platform 31. The platform 31 includes a base 310 for forming droplets, with the base 310 facing the limiting mechanism 2. The width extension direction of the base 310 along the thickness direction Z of the slider 12 is perpendicular to the length extension direction of the slider 12. At least two first temperature sensors 421 are provided on the temperature measuring rod 42. The at least two first temperature sensors 421 are arranged along the direction X of the evaporation device 3 pointing towards the displacement mechanism 1. The first temperature sensors 421 are used to measure the gas-liquid interface temperature in the base 310. When the slider 12 drives the temperature measuring rod 42 to reciprocate along the direction X of the evaporation device 3 pointing towards the displacement mechanism 1, the gas-liquid interface temperature at different positions between the base 310 and the limiting mechanism 2 is measured. Through the mutual coordination between the displacement mechanism 1, the evaporation device 3, and the temperature measuring device 4, it is beneficial to study the discontinuous (jump) change law of temperature distribution in the normal direction of the evaporation gas-liquid interface and other phase change interface thermodynamic non-equilibrium effects.

[0039] Optionally, continue to refer to Figure 2 As shown, the temperature measuring bracket 41 has a temperature measuring weight reduction hole 4102. The temperature measuring weight reduction hole 4102 extends through the thickness direction of the temperature measuring bracket 41, which can not only reduce the overall weight of the temperature measuring bracket 41, but also reduce the cost. The number of temperature measuring weight reduction holes 4102 can be adjusted according to the actual situation, and this embodiment does not make a specific limitation on this.

[0040] In one alternative embodiment, refer to Figure 4 and Figure 5 As shown, Figure 5 This is a schematic diagram of the arrangement of multiple first temperature sensors on a temperature measuring rod provided by the present invention; in this embodiment, at least two first temperature sensors 421 are arranged at non-equidistant intervals, or at least two first temperature sensors 421 are arranged at equidistant intervals.

[0041] Specifically, in combination Figure 4 and Figure 5As shown, the multiple first temperature sensors 421 are arranged in a non-equidistant manner. By arranging adjacent first temperature sensors 421 in a non-equidistant manner, the temperature information of different gas-liquid interfaces can be measured more effectively. This helps to more accurately measure the temperature distribution at the gas-liquid interface and can, to some extent, test for temperature deviations and misleading results at the gas-liquid interface. It should be noted that: non-equidistant arrangement means that the spacing between adjacent first temperature sensors 421 is not equal. This embodiment uses only four first temperature sensors 421 as an example. The four first temperature sensors 421 can be respectively a first sub-temperature sensor 421, a second sub-temperature sensor 421, a third sub-temperature sensor 421, and a fourth sub-temperature sensor 421. The first sub-temperature sensor 421, the second sub-temperature sensor 421, the third sub-temperature sensor 421, and the fourth sub-temperature sensor 421 are respectively installed on the temperature measuring rod 42 along the direction X from the evaporation device 3 to the displacement mechanism 1. The first sub-temperature sensor 421 is located at the end of the temperature measuring rod 42 near the base 310, and the fourth sub-temperature sensor 421 is located at the end away from the temperature measuring rod 42 near the base 310. The second sub-temperature sensor 421 and the third sub-temperature sensor 421 are arranged sequentially on the temperature measuring rod 42 between the first sub-temperature sensor 421 and the fourth sub-temperature sensor 421. The distance between the first sub-temperature sensor 421 and the second sub-temperature sensor 421 on the temperature measuring rod 42 can be smaller than the distance between the third sub-temperature sensor 421 and the fourth sub-temperature sensor 421, or the distances between the first sub-temperature sensor 421, the second sub-temperature sensor 421, the third sub-temperature sensor 421 and the fourth sub-temperature sensor 421 on the temperature measuring rod 42 can all be equal.

[0042] In one alternative embodiment, when at least two first temperature sensors 421 are not equidistantly arranged, the spacing between at least two first temperature sensors 421 on the side closer to the base 310 is smaller than the spacing between at least two first temperature sensors 421 on the side farther from the base 310.

[0043] Specifically, continue to refer to Figure 5 As shown, when the multiple first temperature sensors 421 are not arranged at equal intervals, shortening the distance between two adjacent first temperature sensors 421 on the side closer to the base 310 and lengthening the distance between adjacent first temperature sensors 421 on the side farther from the base 310 can be understood as: the two adjacent first temperature sensors 421 on the side closer to the base 310 are arranged more densely, and the adjacent first temperature sensors 421 on the side farther from the base 310 are arranged more sparsely. Since the temperature gradient at the gas-liquid interface changes more significantly, while the temperature change away from the gas-liquid interface tends to be more stable, the above scheme can make the temperature change at the gas-liquid interface more clearly measured.

[0044] It should be noted that the first temperature sensor 421 can be directly fixed to the temperature measuring rod 42. For example, the first temperature sensor 421 can be directly fixed to the temperature measuring rod 42 using tape (not shown in the figure). This embodiment does not make specific limitations on this.

[0045] Figure 5 Only the arrangement of the multiple first temperature sensors 421 is shown.

[0046] In one alternative embodiment, refer to Figure 6 As shown, Figure 6 This is an assembly diagram of an evaporation device, a displacement mechanism, a temperature measuring mechanism, a light source device, and a pressure plate provided by the present invention; Figure 7 This is an assembly diagram of a displacement mechanism, a temperature measuring mechanism, and a pressure plate provided by the present invention. In this embodiment, the temperature measuring bracket 41 includes a bracket body 410 and a bracket connecting part 411 connected to the bracket body 410. The bracket connecting part 411 is located on the side of the bracket body 410 near the base 310. The side of the bracket body 410 near the limiting mechanism 2 is fixedly connected to the side of the bracket connecting part 411 away from the limiting mechanism 2. The side of the temperature measuring rod 42 near the bracket connecting part 411 can be inserted into the bracket connecting part 411 for easy assembly by the operator. The bracket body 410 is connected to the slider 12. Optionally, the bracket body 410 and the slider 12 are fixedly connected, such as by a threaded connection. The bracket body 410 can be a cuboid structure, such as a strip cuboid structure. Since the bracket body 410 can be a cuboid structure, it can fully contact the slider 12, which is beneficial for more stable fixation on the slider 12 later. At least two first temperature sensors 421 are connected to the side of the temperature measuring rod 42 away from the bracket connection part 411. This embodiment also uses four first temperature sensors 421 as an example. The first sub-temperature sensor 421, the second sub-temperature sensor 421, the third sub-temperature sensor 421 and the fourth sub-temperature sensor 421 are respectively arranged on the side of the temperature measuring rod 42 away from the bracket connection part 411.

[0047] Optionally, continue to refer to Figures 6-8 As shown, the bracket body 410 and the bracket connecting part 411 can be an integral structure. Adopting an integral structure for the bracket body 410 and the bracket connecting part 411 can not only improve the overall stability of the temperature measuring bracket 41, but also reduce the assembly time between the bracket body 410 and the bracket connecting part 411, and improve the assembly efficiency between the temperature measuring bracket 41 and the slider 12.

[0048] In one alternative embodiment, combined with Figures 6-8As shown, the bracket connecting part 411 has a temperature measuring insertion hole (not shown in the figure) that matches the temperature measuring rod 42, which extends in the direction X from the evaporator 3 to the displacement mechanism 1. The temperature measuring insertion hole extends in the direction X from the evaporator 3 to the displacement mechanism 1. The bracket body part 410 has a temperature measuring threaded hole 4101 on the side near the bracket connecting part 411. The temperature measuring insertion hole is connected to the temperature measuring threaded hole 4101. The temperature measuring rod 42 can be directly inserted into the bracket connecting part 411 through the temperature measuring insertion hole for easy operation by the staff.

[0049] In one alternative embodiment, combined with Figure 4 and Figure 6 As shown, along the thickness direction Z of the slider 12, the cross-sectional shape of the bracket connecting part 411 on the side away from the bracket body part 410 is a concave structure (not marked in the figure). Designing the cross-sectional shape of the bracket connecting part 411 on the side away from the bracket body part 410 as a concave structure is beneficial for snapping the temperature measuring rod 42 into the concave structure, and can also limit the movement of the temperature measuring rod 42.

[0050] Optionally, combined Figure 6 and Figure 7 As shown, a V-shaped groove (not shown in the figure) is provided on the upper surface of the bracket connection part 411 near the groove structure along the direction X of the evaporation device 3 pointing towards the displacement mechanism 1. The V-shaped groove facilitates the binding of the first temperature sensor 421 to the temperature measuring rod 42, avoiding additional space occupation. The side wall of the bracket connection part 411 along the length direction Y of the limiting mechanism 2 is a mirror-symmetrical curved surface structure 4112. The mirror-symmetrical curved surface structure 4112 is located on both sides of the V-shaped groove along the width direction of the slider 12. The mirror-symmetrical curved surface structure 4112 can not only hold the temperature measuring rod 42, but also facilitates its passage through the limiting mechanism 2.

[0051] Optionally, combined Figure 6 and Figure 8 As shown, the temperature measuring rod 42 can be a circular structure. The diameter of the circular structure on the side of the temperature measuring rod 42 away from the base 310 is equal. The diameter of the temperature measuring rod 42 on the side closer to the base 310 along the direction X from the evaporation device 3 to the side closer to the displacement mechanism 1 gradually increases, which is beneficial for installing multiple first temperature sensors 421.

[0052] In one alternative embodiment, refer to Figure 2 and Figure 8 As shown, Figure 8This is an assembly diagram of a limiting mechanism, a displacement mechanism, a temperature measuring mechanism, a light source device, and a pressure plate provided by the present invention. In this embodiment, the limiting mechanism 2 includes a heat dissipation bracket 21 and a fixed bracket 22 connected to the heat dissipation bracket 21. The heat dissipation bracket 21 and the fixed bracket 22 are fixedly connected, such as by a threaded connection. The heat dissipation bracket 21 and the fixed bracket 22 are arranged opposite to each other along the direction X of the evaporation device 3 pointing towards the displacement mechanism 1. The fixed bracket 22 is located on the side of the heat dissipation bracket 21 near the base 310, and the shape of the fixed bracket 22 is approximately the shape of a ping-pong paddle. A heat dissipation hole 210 is provided on the heat dissipation bracket 21, and the heat dissipation hole 210 penetrates the heat dissipation bracket 21 along the direction X of the evaporation device 3 pointing towards the displacement mechanism 1. The fixed bracket 22 has a fixing hole 220 that communicates with the heat dissipation hole 210. The fixing hole 220 passes through the fixed bracket 22 along the direction X of the evaporation device 3 pointing to the displacement mechanism 1. The heat dissipation hole 210 and the fixing hole 220 can be circular in shape. The heat dissipation hole 210 and the fixing hole 220 can be on the same axis along the direction X of the evaporation device 3 pointing to the displacement mechanism 1. The temperature measuring rod 42 and part of the temperature measuring bracket 41 pass through the heat dissipation hole 210 and the fixing hole 220 in sequence. The slider 12 drives the temperature measuring rod 42 to reciprocate along the direction X of the evaporation device 3 pointing to the displacement mechanism 1 through the temperature measuring bracket 41. Since multiple first temperature sensors 421 are installed on the temperature measuring rod 42, the temperature of the gas-liquid interface can be measured through the first temperature sensors 421.

[0053] Optionally, combined Figure 2 and Figure 8 As shown, the heat dissipation bracket 21 includes a horizontal plate 212, and a fixing hole 220 is located on the horizontal plate 212. The shape of the horizontal plate 212 can be a rectangular structure, such as a rectangular structure. A first adapter plate 213 and a second adapter plate 214 are arranged on opposite sides of the horizontal plate 212 along the width direction of the slider 12. The first adapter plate 213 and the second adapter plate 214 are arranged on the side away from the base 310. The first adapter plate 213 and the second adapter plate 214 are arranged in a mirror symmetrical manner. The shape of the first adapter plate 213 and the second adapter plate 214 can be an L-shaped structure. A portion of the first adapter plate 213 and a portion of the second adapter plate 214 form a concave structure with the horizontal plate 212 along the direction X from the evaporation device 3 to the displacement mechanism 1. The opening of the concave structure is away from the base 310. The side of the first adapter plate 213 and the second adapter plate 214 away from the horizontal plate 212 is connected to an adapter, which is used to fix the heat dissipation bracket 21.

[0054] Optionally, combined Figure 2 and Figure 8As shown, the first adapter plate 213 and the second adapter plate 214 are respectively provided with adapters 215 on the side away from the horizontal plate 212. The horizontal plate 212 is fixed by the adapters 215, making the limiting mechanism 2 more stable and ensuring that the temperature measuring rod 42 passes through the horizontal plate 212 normally. This is beneficial for measuring the droplets formed on the base 310 and observing the morphology, evaporation rate and formation process of the droplets.

[0055] Optionally, a heat dissipation threaded hole 211 is provided on the horizontal plate 212. The heat dissipation threaded hole 211 penetrates the horizontal plate 212 in the direction X from the evaporator 3 to the displacement mechanism 1. The orthographic projection of the heat dissipation threaded hole 211 in the direction X from the evaporator 3 to the displacement mechanism 1 does not overlap with the orthographic projection of the fixing hole 220. A fixing threaded hole 221 is provided on the fixing bracket 22. The fixing threaded hole 221 penetrates the heat dissipation bracket 22 in the direction X from the evaporator 3 to the displacement mechanism 1. The fixing threaded hole 221 and the heat dissipation threaded hole 211 correspond to each other. In this embodiment, the number of heat dissipation threaded holes 211 and fixing threaded holes 221 can be 4, and the 4 heat dissipation threaded holes 211 can be arranged around the fixing hole 220. The number of heat dissipation threaded holes 211 and fixing threaded holes 221 can also be increased or decreased according to the actual situation. This embodiment does not make a specific limitation.

[0056] In one alternative embodiment, combined with Figures 1-3 As shown, in this embodiment, the evaporation platform 31 also includes a top seat 311 connected to the base 310. The top seat 311 is fixedly connected to the base 310 and supports the base 310, which helps to assist in the formation of droplets inside the base 310. A heat flow sensor 312 is provided between the top seat 311 and the base 310. The heat flow sensor 312 can accurately measure the change in heat flow at the bottom of the droplets inside the base 310, reflecting the influence of evaporation effect and thermocapillary convection on the heat transfer characteristics inside the droplets. The aforementioned thermocapillary convection phenomenon refers to the thermocapillary flow driven by surface tension becoming the main form of natural convection under the special conditions of complete weightlessness in the space environment. It is also the main factor affecting the heat and mass transport process of space fluids. Thermocapillary convection is a thermal convection phenomenon related to the fluid surface or interface. Later, the base 310 presses the heat flow sensor 312 tightly, and a heating device 313 is set between the top seat 311 and the base 310. The heating device 313 is installed on the side of the top seat 311 away from the base 310. The base 310 is heated by the heating device 313. Later, it is beneficial to study the discontinuous (jump) change law of temperature distribution in the normal direction of the evaporation gas-liquid interface and other phase change interface thermodynamic non-equilibrium effects.

[0057] A second temperature sensor 3104 is installed on the top base 311. This second temperature sensor 3104 is used to accurately measure the temperature at different locations on the bottom surface of the droplet within the base 310, reflecting the influence of evaporation and thermocapillary convection on the internal heat transfer characteristics of the droplet. The second temperature sensor 3104 can be a thermocouple, specifically a 5TC-TT-T-36-36 model. The thermocouple model can be adjusted according to actual conditions; this embodiment does not impose a specific limitation. The temperature measurement range of the thermocouple can be -200℃ to +350℃. Alternatively, other temperature sensors, such as resistance temperature sensors, can be used as the second temperature sensor 3104, depending on the actual situation. In this embodiment, the diameter of the thermocouple can also be selected from 25μm to 250μm. For example, the diameter of the thermocouple can be 25μm, 50μm, 75μm, 100μm, 125μm, 150μm, 175μm, 200μm, 225μm or 250μm. Preferably, the diameter range of the thermocouple is 75μm-150μm.

[0058] A liquid injection hole 3101 is provided on the base 310, and the liquid injection hole 3101 extends through the thickness direction of the base 310. A sensing hole (not shown in the figure) is provided on the heat flow sensor 312, and the sensing hole extends through the thickness direction of the heat flow sensor 312. A liquid inlet pipe (not shown in the figure) is provided on the top seat 311 and communicates with the liquid injection hole 3101. Both the liquid injection hole 3101 and the sensing hole are connected to the liquid inlet channel. A liquid injection connector 3103 is provided on the side wall of the top seat 311. The liquid injection connector 3103 is used to connect to the injection device (not shown in the figure). The injection device injects liquid into the base 310 through the liquid injection connector 3103. The liquid injection connector 3103 is connected to the liquid inlet channel. The liquid injection connector 3103 is connected to the liquid injection hole 3101 through the liquid inlet pipe and the sensing hole in sequence to provide liquid to the base 310 and form droplets on the base 310.

[0059] The evaporation device 3 also includes a base 32 connected to the evaporation platform 31. The heating device 313 is placed between the top seat 311 and the base 32, and the top seat 311 assists the base 310 in heating. The base 32 and the top seat 311 can be made of metal. Metal materials have high strength and hardness, can withstand large loads and deformations, and have good thermal conductivity and corrosion resistance, such as copper, steel or aluminum. This embodiment does not make specific limitations on them.

[0060] The above scheme was realized, utilizing the microgravity environment of space to study the physical mechanism of interfacial temperature discontinuity in the evaporation phase change interface under the interference of buoyancy effect, experimentally observing and studying the influence of different evaporating liquid interface temperature jumps, thermocapillary convection, evaporation rate (environmental pressure change) on it, and proposing a theoretical expression for the evaporation interface temperature discontinuity.

[0061] Optionally, the base 310 is provided with a base groove 3105, which can be an annular structure. The base groove 3105 helps to limit the droplet diameter. It can be understood that the droplet diameter is limited to the range of the diameter of the base groove 3105. The diameter of the base groove 3105 can be adjusted according to the actual situation, and this embodiment does not make a specific limitation. Optionally, combined Figure 1 and Figure 8 As shown, the evaporation platform 31 also includes a heat insulation device 314, which is sleeved on part of the top seat 311. The heat insulation device 314 prevents the heat loss generated by the heating device 313 inside the top seat 311 and plays a role in heat preservation of the top seat 311. This accelerates the evaporation and vaporization of the droplets inside the base 310, while forming a uniform and rapid temperature difference for the droplets inside the base 310 and reducing heat loss inside the base 310.

[0062] Optionally, combined Figure 1 and Figure 8 As shown, a support frame 321 is provided on the base 32. The support frame 321 is arranged opposite to the liquid injection connector 3103. The support frame 321 is used to support part of the heat flow sensor 312. The bottom surface of part of the heat flow sensor 312 is in contact with the top surface of the support frame 321 to avoid the wires of the heat flow sensor 312 from breaking, which would affect the high-precision heat flow measurement of the droplets.

[0064] In one alternative embodiment, continue to refer to Figure 6 and Figure 8 As shown, this embodiment also includes a light source device 5 and a pressure plate 6 connected to the light source device 5. The pressure plate 6 can directly abut against the light source device 5. The light source device 5 is used to provide a light source for the evaporation stage 31, which is beneficial for observing the morphology and formation pattern of the droplets. The light source device 5 and the pressure plate 6 are arranged opposite each other along the direction X of the evaporation device 3 pointing towards the displacement mechanism 1. The pressure plate 6 is located on the side of the slide table 11 away from the slider 12. The pressure plate 6 can support the slide table 11 and is fixedly connected to the slide table 11. For example, the pressure plate 6 and the slide table 11 can be connected by a thread. The slide table 11 is located above the pressure plate 6. The light source device 5 is provided with a pressure plate receiving space 51 on the side near the pressure plate 6. The cross-sectional shape of the pressure plate receiving space 51 along the thickness direction Z of the slider 12 can be L-shaped. The pressure plate receiving space 51 extends along the width direction of the slider 12, which is beneficial for the pressure plate 6 to directly abut against the pressure plate receiving space 51.

[0065] The side of the light source device 5 near the slide table 11 and the side of the pressure plate 6 near the slide table 11 are on the same horizontal plane, which is conducive to the evaporation device 3, the limiting mechanism 2 and the displacement mechanism 1 being on the same plane, and is beneficial for observing the droplets later.

[0066] The base 32 abuts against the side of the light source device 5 away from the pressure plate 6. The orthographic projection of the evaporation stage 31 along the thickness direction Z of the slider 12 overlaps with the orthographic projection of the light source device 5, so as to make the base 32, the evaporation stage 31 and the light source device 5 as compact as possible.

[0067] In one alternative embodiment, combined with Figure 7 and Figure 8 As shown, at least two pressing blocks 61 are provided on the side of the pressure plate 6 near the light source device 5. The bottom surface of the pressing blocks 61 and the side of the pressing blocks 61 near the light source device 5 are in complete contact with the light source device 5, which can increase the contact area between the pressure plate 6 and the light source device 5, and help the pressure plate 6 to be more firmly fixed on the light source device 5. The pressing blocks 61 can be rectangular in structure, and there can be two pressing blocks 61. At least two pressing blocks 61 are arranged along the length Y of the limiting mechanism 2. The two pressing blocks 61 can be arranged along the length Y of the limiting mechanism 2. There is a gap 62 between two adjacent pressing blocks 61. The gap 62 facilitates the passage of the cable of the light source device 5, and further improves the compactness between the light source device 5 and the pressure plate 6.

[0068] Optionally, the pressure plate 6 is provided with a pressure plate weight reduction hole 63. The pressure plate weight reduction hole 63 penetrates the pressure plate 6 along the thickness direction Z of the slider 12. The orthographic projection of the pressure plate weight reduction hole 63 along the thickness direction Z of the slider 12 overlaps with the orthographic projection of the slide table 11. The shape of the pressure plate weight reduction hole 63 can be rectangular. The pressure plate weight reduction hole 63 can not only reduce the weight of the pressure plate 6, but also help to reduce the cost of the pressure plate 6.

[0069] It should be noted that the light source device 5 and the pressure plate 6, the light source device 5 and the evaporation device 3, the limiting mechanism 2 and the displacement mechanism 1, and the evaporation mechanism, the limiting mechanism 2 and the displacement mechanism 1 and the light source device 5 and the pressure plate 6 are all designed in a compact manner, which meets the requirements of aerospace payload structure.

[0070] As can be seen from the above embodiments, the compact, movable space temperature distribution measurement mechanism for closed liquid pools provided by the present invention achieves at least the following beneficial effects:

[0071] This invention provides a compact, movable space temperature distribution measurement mechanism suitable for use in a sealed liquid tank. The mechanism includes a displacement mechanism, a limiting mechanism, and an evaporation device. The displacement mechanism and the evaporation device are arranged opposite to each other, and the limiting mechanism is located between the displacement mechanism and the evaporation device. The displacement mechanism includes a slide table and a slider slidably connected to the slide table. A temperature measuring device is located on the side of the slider away from the slide table, and the temperature measuring device passes through the limiting mechanism. The slider drives the temperature measuring device to reciprocate along the direction from the evaporation device towards the displacement mechanism. The temperature measuring device includes a temperature measuring bracket and a temperature measuring rod connected to the temperature measuring bracket. The temperature measuring rod is located on the side of the temperature measuring bracket closer to the evaporation device, and the length extension direction of the temperature measuring rod is the same as the length extension direction of the temperature measuring bracket. The temperature measuring bracket is connected to the slider. The evaporation device includes an evaporation platform, and the evaporation platform includes... The device includes a base for forming droplets, with the base facing the limiting mechanism. The width extension direction of the base along the thickness direction of the slider is perpendicular to the length extension direction of the slider. At least two first temperature sensors are provided on the temperature measuring rod, arranged along the direction of the evaporation device pointing towards the displacement mechanism. The first temperature sensors are used to measure the gas-liquid interface temperature in the base. When the slider drives the temperature measuring rod to reciprocate along the direction of the evaporation device pointing towards the displacement mechanism, the gas-liquid interface temperature at different positions between the base and the limiting mechanism is measured. Through the mutual coordination between the displacement mechanism, the evaporation device, and the temperature measuring device, it is beneficial to study the discontinuous (jump) change law of temperature distribution in the normal direction of the evaporation gas-liquid interface and other phase change interface thermodynamic non-equilibrium effects.

[0072] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A spatial temperature distribution measuring mechanism, characterized in that, it comprises a displacement mechanism (1) and a temperature measuring device (4) fixedly installed on the displacement mechanism (1), the displacement mechanism (1) can drive the temperature measuring device (4) to move linearly, and the direction of linear movement is perpendicular to the plane of the base (310) of the evaporation table (31) for forming droplets, so as to measure the gas-liquid interface temperature at different positions. 2.The spatial temperature distribution measuring mechanism according to claim 1, characterized in that, the displacement mechanism (1) and the temperature measuring device (4) are both installed in a closed evaporation liquid pool. 3.The spatial temperature distribution measuring mechanism according to claim 1, characterized in that, the temperature measuring device (4) comprises a temperature measuring support (41), a temperature measuring rod (42) and a first temperature sensor (421), the temperature measuring support (41) is fixedly installed on the displacement mechanism (1), the temperature measuring rod (42) is fixedly installed on the temperature measuring support (41) close to the evaporation table (31), the length direction of the temperature measuring rod (42) is consistent with the linear movement direction of the temperature measuring device (4), and at least two first temperature sensors (421) are arranged on the temperature measuring rod (42) along the length direction, so as to simultaneously measure the gas-liquid interface temperature at multiple positions. 4.The spatial temperature distribution measuring mechanism according to claim 3, characterized in that, a plurality of first temperature sensors (421) are arranged on the temperature measuring rod (42), and the interval between adjacent first temperature sensors (421) gradually decreases in the direction close to the evaporation table (31), so as to adapt to the change of the gas-liquid interface temperature gradient. 5.The spatial temperature distribution measuring mechanism according to claim 3, characterized in that, the displacement mechanism (1) comprises a sliding table (11) and a sliding block (12) installed on the sliding table (11), the temperature measuring support (41) is fixedly installed on the sliding block (12), and the sliding block (12) can drive the temperature measuring support (41) to move linearly. 6.The spatial temperature distribution measuring mechanism according to claim 1, characterized in that, a light source device (5) is further arranged between the displacement mechanism (1) and the evaporation table (31), the light source device (5) is used to provide light source for the evaporation table (31), so as to observe the morphology and formation rule of the droplets. 7.A gas-liquid interface temperature jump experiment system, characterized in that, it comprises an evaporation table (31) and the spatial temperature distribution measuring mechanism according to any one of claims 1-6, and the evaporation table (31) and the spatial temperature distribution measuring mechanism are both arranged in a closed evaporation liquid pool; the evaporation table (31) comprises, in sequence along the direction away from the temperature measuring device (4), a base (310) for forming droplets, a heat flow sensor (312) for measuring the change of heat flow at the bottom of the droplets, a top seat (311) for bearing the base (310), and a heating device (313) for heating the base (310). The base (310) is provided with a liquid injection hole (3101), the thermal flow sensor (312) is provided with a sensing hole, and the top seat (311) is provided with a liquid inlet pipeline, the liquid injection hole (3101), the sensing hole and the liquid inlet pipeline are communicated, and the liquid inlet pipeline is connected with a liquid injection joint (3103) at an end away from the sensing hole, so as to provide liquid for forming liquid drops to the base (310).

8. The system according to claim 7, wherein, The side surface of the top seat (311) is further provided with a plurality of second temperature sensors (3104), and the second temperature sensors (3104) are used for measuring the temperature of different positions of the bottom surface of the liquid drop in the base (310), so as to reflect the influence of the evaporation effect and the thermal capillary convection on the internal heat transfer characteristics of the liquid drop.

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