Method and experimental device for inhibiting boiling drying phenomenon in closed body

Abstract

The invention provides a method and an experimental device for inhibiting a boiling drying phenomenon in a closed body. The method for inhibiting the boiling and drying phenomenon in the closed body comprises the steps that a cavity of the hollow closed body is filled with fluid at the preset temperature, and the hollow closed body is closed; after the closed body is cooled, the liquid in the closed body shrinks, so that a certain vacuum space is formed in the hollow closed body; when the hollow closed body is heated and reaches the preset temperature, the fluid in the closed body expands to fill the closed body, and meanwhile, the pressure higher than the conventional boiling point of the fluid is generated in the hollow closed body, so that the fluid cannot boil. The experimental device can be used for observing different boiling inhibition processes and obtaining various boiling inhibition parameters by filling fluids with different temperatures. Experiment results and experiment parameters can be used for reducing and eliminating the boiling drying phenomenon in the container in the industrial heat transfer field, heat transfer heat resistance caused by the boiling drying phenomenon is eliminated, and the liquid heat transfer effect of the hollow closed body can be greatly improved.

Description

Technical Field

[0001] The present application relates to the field of industrial heat transfer, and in particular to a method and an experimental device for suppressing boiling dry-out phenomenon in a closed body. Background Art

[0002] In industrial heat transfer applications, boiling heat transfer technology in a closed system is the mainstream. However, there is also a bottleneck that has always affected the further improvement of heat transfer capacity, that is, the boiling and drying phenomenon of the heating part, also known as the film boiling phenomenon. If heating continues when film boiling occurs, a large number of bubbles will be generated at the junction of the wall of the closed body and the liquid, and even connected into a piece to form a layer of air film, or a large bubble will be formed, so that the inner wall of the heat transfer device is isolated by the air film or bubbles, so that heat cannot be transferred from the wall of the closed body to the heat transfer medium (i.e., heat transfer medium), causing local overheating of the heat transfer device, resulting in failure of the heat transfer application or damage to the device. In actual heat transfer applications, this must be avoided. In order to overcome the boiling and drying phenomenon, the inventors are aware of the following technologies: First, strengthen the capillary structure of the wall of the closed system, so that the wall has better evaporation efficiency, and enhance the surface tension of the wall, increase the reflux of the heat transfer liquid, reduce the wall temperature, reduce the evaporation amount, and reduce the risk of boiling and drying. Second, design a liquid pool for storing supplementary working fluid to replenish the liquid at the heating point faster. Third, increase the heat carrying capacity of the working fluid or increase the working fluid flow rate. Fourth, apply system pressure from the outside to intervene in the boiling dry-up phenomenon. However, the technical means mentioned in the first to third items above only increase the upper limit of the boiling dry-up phenomenon, and it is difficult to completely suppress the boiling dry-up phenomenon. Although the technical means mentioned in the fourth item above can suppress the boiling dry-up phenomenon, it requires the design of a complex control system. The boiling dry-up phenomenon restricts the improvement of the heat transfer capacity of traditional heat transfer technology. Solving this bottleneck problem can greatly improve the heat transfer capacity of the closed system.

[0003] The Chinese invention patent with publication number "CN111895814A" discloses "a sinusoidal microchannel heat exchanger with a micro-cavity structure and a manufacturing method thereof". The heat exchanger includes a cover plate and a microchannel heat sink that are bonded together. The microchannel heat sink is provided with a number of microchannels arranged in parallel at equal intervals. The microchannel is sinusoidal in the direction of liquid flow. The cross section of the microchannel is an inverted triangle. Micro-rib walls that are sinusoidal in the direction of liquid flow are formed between adjacent microchannels. The cross section of the micro-rib walls is a trapezoid. Micro-cavity structures are provided on the side walls and bottom surfaces of the microchannels. The heat exchanger uses a capillary structure to intervene in the boiling dry-out phenomenon. It is a technology known to the inventor, which increases the upper limit of the boiling dry-out phenomenon, but it is still difficult to efficiently suppress the boiling dry-out phenomenon. Summary of the invention

[0004] The present application is made in view of the above-mentioned state of the prior art. In a first aspect, the present application provides a method for suppressing boiling dry-out phenomenon in a closed body.

[0005] The method adopted in the present application includes: injecting a fluid with a preset temperature into the cavity of a hollow closed body, and the hollow closed body can perform internal and external heat exchange; when the preset temperature is equal to or higher than the boiling point of the fluid at standard atmospheric pressure, the fluid will not fill the closed cavity when it is heated to the boiling point, and will not generate a pressure exceeding the standard atmospheric pressure and the saturated vapor pressure in the hollow closed body; when the preset temperature is lower than the boiling point of the fluid at standard atmospheric pressure, after the fluid is heated to the preset temperature, the fluid will fill the cavity and generate a pressure in the cavity that exceeds the standard atmospheric pressure and the saturated vapor pressure of the hollow closed body.

[0006] As a further improvement of the present application, when the preset temperature is lower than the boiling point of the fluid at standard atmospheric pressure, the preset temperature is higher than the temperature of the fluid at maximum density at normal pressure.

[0007] As a further improvement of the present application, the space in the cavity that is not filled with the fluid forms a cavity, and the ratio of the volume of the cavity to the volume of the cavity is a first decimal. The ratio of the volume of the fluid of equal mass at the preset temperature to the volume at the boiling point under standard atmospheric pressure is a second decimal, and the sum of the first decimal and the second decimal is not greater than 1.

[0008] As a further improvement of the present application, the formula of the first decimal is: Wherein, the volume of the cavity is V1, the volume of the cavity is V2, the first decimal is k1; the formula of the second decimal is; Wherein, the volume of the fluid of the same mass at the preset temperature under standard atmospheric pressure is V3, and the volume at the boiling point is V4, and the second decimal is k2; and

[0009]

[0010] As a further improvement of the present application, the second decimal is greater than 0.95, the fluid is water, and the preset temperature is 4° C.; and / or the first decimal is 0.035, and the fluid is water.

[0011] As a further improvement of the present application, the material of the hollow closed body includes metal or non-metal; the fluid includes organic liquid or inorganic liquid.

[0012] In the second aspect, a test device for suppressing the boiling of liquid in a closed body is provided. The device comprises: a closed cavity / tube, the closed cavity / tube comprises a cavity capable of accommodating a fluid; a T-tube, the T-tube is connected to the closed cavity / tube; a valve, the valve comprises a first valve and a second valve located on the T-tube, the first valve and the second valve respectively controlling the filling and discharge of the fluid; a heater, the heater being capable of heating the closed cavity / tube; wherein the closed cavity / tube forms a hollow closed body filled or not filled with the fluid.

[0013] As a further improvement of the present application, the enclosed cavity / tube is a straight tube or a loop tube, and the enclosed cavity / tube includes a loop tube and a straight tube, and the heater of the loop tube heats the closed body / tube.

[0014] As a further improvement of the present application, the T-shaped pipe includes a first straight pipe and a second straight pipe vertically connected to each other, one end of the second straight pipe is connected to the loop pipe, the first valve and the second valve are both located on the first straight pipe, and the first valve and the second valve are respectively located on both sides of the second straight pipe.

[0015] As a further improvement of the present application, the sealed cavity tube has transparency or is provided with a transparent observation window; the sealed cavity tube is arranged with a pressure detection point and a plurality of temperature detection points.

[0016] The beneficial effects of the method for suppressing boiling and drying up in a closed body of the present application include: a method for obtaining a system pressure for suppressing boiling and drying up by utilizing the relationship between the expansion of the liquid in the hollow closed body and the reserved space of the hollow closed body is proposed. This method is beneficial to the conduction of heat on the heated wall surface of the heat transfer system, thereby reducing and eliminating the boiling and drying up phenomenon in the container in the field of industrial heat transfer, eliminating the heat transfer resistance formed thereby, and can greatly improve the heat transfer capacity of the hollow closed body heat transfer device.

[0017] The principle that the expansion pressure of fluids represented by liquids is greater than that of gases is utilized, and the volume change of liquids after being heated is taken into account. The relationship between the liquid expansion amount and the retained cavity of the hollow enclosure is used to create a system pressure. When the hollow enclosure is heated in actual heat transfer applications, the thermal expansion force generated by the liquid inside due to the temperature rise is greater than the thermal expansion force of saturated steam. This makes the hollow enclosure generate a pressure higher than a standard atmospheric pressure or the saturated steam pressure in the system at a relative temperature, so that the boiling dry phenomenon cannot occur.

[0018] The ratio of the relative temperature volume of the liquid in the hollow closed body to the retained volume of the cavity is precisely used to obtain a system pressure greater than the normal pressure and the saturated vapor pressure generated by the liquid after thermal expansion, thereby suppressing the boiling phenomenon and further suppressing boiling and drying up. If the above ratio relationship is not considered, and liquid is added to the container as in conventional means, the liquid will expand due to thermal expansion, which will generate too large or too small system pressure in the hollow closed body, resulting in the inability to suppress the boiling and drying up phenomenon or causing the hollow closed body to deform or rupture. The method of suppressing the boiling and drying up phenomenon in the closed body of the present application can avoid this problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 This is a schematic diagram of the principle of an embodiment of the method for suppressing boiling and drying phenomenon in a closed body of the present application;

[0021] Figure 1 (a) is a schematic diagram of the principle of the first embodiment of the method for suppressing boiling and drying phenomenon in a closed body of the present application;

[0022] Figure 1 (b) is a schematic diagram of the principle of the second embodiment of the method for suppressing boiling dry-out phenomenon in a closed body of the present application;

[0023] Figure 2 It is a structural schematic diagram of an embodiment of an experimental device for suppressing boiling and drying phenomenon in a closed body of the present application;

[0024] Figure 3 It is a structural schematic diagram of an embodiment of an experimental device for suppressing boiling and drying phenomenon in a closed body of the present application;

[0025] Figure 4 is a flow chart of a first embodiment of the method for suppressing boiling and drying phenomenon in a closed body of the present application;

[0026] Figure 5 is a flow chart of a second embodiment of the method for suppressing boiling and drying phenomenon in a closed body of the present application;

[0027] Figure 6 It is a flow chart of a third embodiment of the method for suppressing boiling dry-out phenomenon in a closed body of the present application.

[0028] Description of Reference Numerals

[0029] 1-heater; 2-first valve; 3-second valve; 4-T-tube; 41-first straight tube; 42-second straight tube; 5-locking block; 6-enclosed cavity / tube; 61-loop tube; 62-straight tube; 7-fluid; 8-cavity; 9-hollow enclosure; 10-pressure detection point; 11-temperature detection point. DETAILED DESCRIPTION

[0030] The exemplary embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, and are not intended to exhaust all possible methods of the present application, nor to limit the scope of the present application.

[0031] The method for suppressing boiling and drying up phenomenon in a closed body and the experimental device for suppressing boiling and drying up phenomenon in a closed body of the present application are further described in detail below in conjunction with specific embodiments.

[0032] See also Figure 1 and Figure 4 The embodiment of the present application provides a method for suppressing boiling and drying phenomenon in a closed body. The method injects a fluid 7 represented by a liquid with a preset temperature into the cavity of a hollow closed body 9. The hollow closed body 9 is a container. The hollow closed body 9 can exchange heat inside and outside. The material of the hollow closed body 9 is conducive to heat conduction, and the heat of the fluid 7 and the environment outside the hollow closed body can be transferred. Figure 1 As shown in (b), when the fluid 7 injected into the hollow enclosure as required is heated and expands in volume, and fills the cavity, a pressure exceeding the standard atmospheric pressure and the saturated vapor pressure in the hollow enclosure 9 will be generated in the cavity. When the fluid 7 is naturally cooled, the volume will shrink, and a cavity 8 will be naturally formed in the hollow enclosure 9. Figure 1 Here, the noun "filled" generally means pressurization, while the noun "filled" generally does not mean pressurization.

[0033] Figures 4 to 6 The flowchart is a schematic diagram of the method for suppressing boiling and drying phenomenon in a closed body of the present application. In different application scenarios, Figure 4 , Figure 5 , Figure 6 There are also differences between Figure 4 The content of the last judgment box is "Is it at the preset temperature or pressure value?" If it is "yes", the whole process ends; if it is "no", the amount of fluid 7 is adjusted. Figure 5 The content of the last judgment box is "Is the pressure exceeding the standard?" If it is "No", the whole process ends. If it is "Yes", the liquid that has been poured in is released. Figure 4 and Figure 5 Both have two judgment boxes, namely Figure 4 and Figure 5 The first judgment box of the Figure 6 There is only one judgment box. Figure 6 The judgment box is "Whether the pressure exceeds the standard after boiling is suppressed". If it is "No", the whole process ends. If it is "Yes", the liquid that has been poured in is released.

[0034] As for the cavity 8 inside the hollow enclosure 9, as long as the fluid 7 filled is less than the maximum density, that is, higher than the maximum density temperature, no matter how many degrees Celsius the preset temperature is, as long as the temperature inside the hollow enclosure 9 decreases, a negative pressure space, that is, the cavity 8, will be formed. The air pressure in this cavity 8 will be lower than one standard atmospheric pressure.

[0035] Conventional methods of weakening boiling include using heat pipes, which increases the evaporation rate or optimizes the evaporation state to conduct heat faster, thereby reducing the temperature and eliminating the boiling dry-out phenomenon. Conventional methods of suppressing boiling dry-out also include using pressurized water reactors, which applies a pressure exceeding the boiling point temperature from the outside of the closed system, thereby making the actual pressure required for the system to reach the conventional boiling point temperature higher, making it impossible for the liquid to boil, thereby suppressing the boiling dry-out phenomenon. The method of the present application utilizes the thermal expansion phenomenon of the liquid in the hollow enclosure 9 itself, and the system pressure generated after the volume of the hollow enclosure 9 is filled is higher than the normal atmospheric pressure or the saturated vapor pressure, thereby suppressing the boiling dry-out phenomenon.

[0036] At present, the most efficient conventional heat transfer is to use the latent heat of phase change, such as heat pipe heat transfer or steam heat transfer. The most commonly used latent heat of phase change is the latent heat in the phase change phenomenon between liquid and vapor. For example, the phase change process of water boiling evaporation and condensation. Therefore, the boiling phenomenon is the most important factor in heat transfer. However, the boiling dry-up phenomenon caused by the boiling phenomenon is an insurmountable bottleneck for improving the boiling heat transfer capacity. The conventional heat pipe heat transfer method cannot actually fill the closed container with liquid, so the boiling dry-up phenomenon occurs.

[0037] The characteristics of the method for suppressing boiling and drying up phenomenon in a closed body of the present application are: first, the liquid in the hollow closed body 9 must fill the hollow closed body 9 before boiling; second, any temperature point below the boiling point of the liquid at normal pressure can also be selected as the preset temperature, and then the hollow closed body 9 is filled by the thermal expansion of the liquid due to the heating.

[0038] In addition, regarding the internal pressure that the hollow closed body 9 can withstand, there is no need to consider the risk of the hollow closed body 9 bursting, because as long as the design of the hollow closed body 9 meets the strength requirements, it can be used normally. The ratio of the volume of the cavity 8 to the volume (or capacity) of the cavity is set to a first decimal. The ratio of the volume of the fluid 7 of equal mass at a preset temperature to the volume at the boiling point under standard atmospheric pressure is set to a second decimal, and both the first decimal and the second decimal are less than 1, and the sum of the first decimal and the second decimal is approximately 1. The sum of the first decimal and the second decimal can be equal to 1, or the sum of the first decimal and the second decimal is slightly less than 1.

[0039] Wherein, assuming that the volume of the cavity 8 is V1, the volume of the cavity is V2, and the first decimal is k1, the formula for obtaining the first decimal is: Assume that the volume of the same mass of fluid 7 at the preset temperature under standard atmospheric pressure is V3, and the volume at the boiling point is V4, and the second decimal is k2. The formula for obtaining the second decimal is: And the sum of the first decimal and the second decimal can be less than 1, that is

[0040] By accurately utilizing the expansion rate parameters of the liquid at different temperatures to calculate and reserve the space after the hollow closed body 9 is filled with liquid, that is, the volume of the cavity 8, it can be obtained that after the liquid in the hollow closed body 9 reaches the preset temperature, the pressure generated in the entire system of the hollow closed body 9 will exceed the normal boiling point pressure of the liquid, thereby preventing boiling from occurring.

[0041] Figure 1 In (a), different filling patterns are used to express the cavity 8 and the fluid 7, that is, the cavity and the liquid can be expressed separately. Figure 1 (a) and Figure 1 The hollow closed body 9 in (b) is indicated by a cylinder. Figure 1 (b) can also be used to express the state of heating and swelling, that is, when it is just filled, it is originally like Figure 1 In the state shown in (a), when the fluid 7 is heated to the full swelling temperature, the volume of the fluid 7 expands until Figure 1 (b) shows the cavity that occupies the entire hollow closed body 9.

[0042] The method of suppressing boiling and drying up in the closed body of the present application is to utilize the expansion of the fluid 7, thereby suppressing the boiling of the fluid 7 in the hollow closed body 9. The method requires that the filling amount (i.e., the actual amount of the fluid 7 added to the hollow closed body 9) matches the expansion rate of the fluid 7, and calculates the filling ratio of the liquid at the initial preset temperature. The volume of the fluid 7 that is finally expanded by heat matches the total volume of the cavity of the hollow closed body 9, which can actually be slightly smaller or larger.

[0043] When a specific liquid and a specific preset temperature are selected, the ratio of the volume of the liquid at the preset temperature to the volume at the boiling point is constant, that is, the second decimal is constant. The first decimal, that is, the ratio of the volume of the cavity 8 to the volume of the cavity, can be easily changed, which can be controlled by changing the actual amount of liquid added. When the sum of the first decimal and the second decimal is equal to 1, theoretically, the liquid will just fill the entire hollow enclosure 9 at the boiling point. When the sum of the first decimal and the second decimal is slightly less than 1, that is, the first decimal can be smaller, that is, the actual volume of the cavity 8 is smaller, and the actual liquid is more, in this case, the liquid will definitely fill the entire hollow enclosure 9 at the boiling point, and it also provides a little margin for the mutual squeezing of liquid expansion and gas expansion, so that the hollow enclosure 9 can achieve the actual optimal effect when the internal liquid boils.

[0044] The method for suppressing the boiling and drying phenomenon in the closed body of the present application utilizes the principle that the expansion pressure of the liquid is greater than the expansion pressure of the gas. It also utilizes the phenomenon that the liquid will leave a certain cavity 8 when it cools down and shrinks in the hollow closed body 9. The boiling phenomenon occurs at the corresponding system pressure and the boiling point temperature of the fluid 7. Any change in either of the two will affect the occurrence of the boiling phenomenon. The thermal expansion rate of the liquid is generally lower than that of the gas, that is, the phenomenon that the liquid changes in volume with temperature is not obvious, but the thermal expansion pressure of the liquid is higher than that of the gas. Therefore, when liquid and gas exist in a hollow closed body 9 at the same time, heating causes volume expansion, and the volume expansion of the liquid will squeeze the volume expansion space of the gas. Using this physical principle, the duty cycle of the liquid in the hollow closed body 9 (i.e., the ratio of the volume of the cavity 8 to the volume of the cavity) is appropriately adjusted, so that after the liquid is heated and fills the hollow closed body 9, the pressure value generated will be higher than the pressure value of the saturated steam generated by boiling, thereby suppressing the boiling phenomenon in the hollow closed body 9, eliminating the overly intense boiling phenomenon, until the boiling and drying phenomenon is eliminated.

[0045] If the liquid is filled into the entire hollow enclosure 9 when the preset temperature is lower than the boiling point, the pressure generated by the thermal expansion of the liquid in the hollow enclosure 9 during the subsequent heating process will be greater than a standard atmospheric pressure.

[0046] like Figure 1 As shown in (b), in one embodiment, a fluid 7 at boiling point and having a boiling point of not more than 100° C. under standard atmospheric pressure is filled into the cavity of the hollow enclosure 9, and the fluid 7 may be water in a liquid.

[0047] like Figure 1 As shown in (a), in one embodiment, the ratio of the volume of the fluid at the preset temperature to the volume at the boiling point is greater than 0.95, that is, the second decimal is greater than 95%, and the fluid 7 can be water in the liquid, and the preset temperature of the water is 4° C. Water at 4° C. has the largest density and the smallest volume.

[0048] For example, when water is used as the working fluid, the expansion rate of water is about 4.13%. As long as water with a preset temperature of 4°C is injected into the hollow closed body 9, when the volume of water accounts for more than 95% of the volume of the cavity, the entire hollow closed body 9 can be nearly filled up during subsequent heating, so that the pressure inside the hollow closed body 9 is maintained at a relatively high level, that is, higher than the level of steam pressure growth, thereby increasing the boiling temperature or increasing the pressure value at the boiling point, so that the boiling dryness phenomenon is weakened or cannot occur.

[0049] The water can be pure water without impurities. Taking pure water as an example, the volume expansion rate of pure water is 4.13%, so the ratio of the volume of the cavity 8 to the volume of the cavity can be less than 4%, preferably 3.5%. In actual operation, method one: fill the hollow enclosure 9 with water (water with a density greater than the maximum and less than the minimum density at normal pressure) with a temperature higher than room temperature to a temperature lower than the boiling point of 100°C, and then seal the hollow enclosure 9. Method two: add water at 4°C (with the highest density at normal pressure) into the hollow enclosure 9, and the volume of water accounts for more than 95.5% of the total volume of the cavity of the hollow enclosure 9. Method three: other filling methods that meet the above-mentioned value requirements can also be used for filling.

[0050] In one embodiment, the ratio of the volume of the cavity 8 to the volume of the cavity is preferably 3.5%, that is, the first decimal is preferably 3.5%. At this time, it also means that the sum of the first decimal and the second decimal is slightly less than 1.

[0051] In one embodiment, the preset temperature is preferably 80° C., and the fluid 7 fills the cavity.

[0052] The expansion rate of the liquid is related to the temperature value before the liquid boils and vaporizes from its maximum density to its minimum density. Therefore, under a standard atmospheric pressure, after the hollow closed body 9 is filled with water at a preset temperature of 80°C and sealed, the liquid temperature drops after a period of time. When heated again, the liquid will fill the hollow closed body 9 at 80°C. Therefore, it is only necessary to fill the hollow closed body 9 with liquid at a preset temperature. After the liquid is cooled, a cavity 8 will appear in the hollow closed body 9 due to the volume contraction of the liquid. When the liquid is heated to the initial preset temperature, the cavity 8 will be filled with liquid at this temperature again, and the cavity 8 will disappear. In addition, the lower the preset temperature of the liquid that initially fills the hollow closed body 9, the smaller the volume of the cavity 8 formed in the container after the liquid is cooled, and the smaller the temperature span required for heating and filling the hollow closed body 9. With the help of this technical concept, the volume of the cavity 8 can be controlled by setting a specific preset temperature, and the specific value of heat transfer that the hollow closed body 9 can achieve from the beginning to the boiling stage can also be controlled.

[0053] 80°C is an example temperature value, and this embodiment can also be simplified to mean that the liquid in the hollow enclosure 9 is heated to a certain temperature before being sealed and allowed to stand for a period of time. When the hollow enclosure 9 is heated to this temperature point again, the liquid will fill the hollow enclosure 9, thereby generating a pressure higher than the normal boiling point of the liquid in the hollow enclosure 9, so that the boiling-drying phenomenon cannot occur.

[0054] In one embodiment, the hollow enclosure 9 is made of metal or non-metal, and the non-metal includes glass. The fluid 7 includes an organic liquid or an inorganic liquid, and water is one of the inorganic liquids and has excellent heat conduction capability.

[0055] If the material of the hollow enclosure 9 is glass, it is convenient for visual operation. If it is made of metal, a metal material that can cope with greater expansion pressure can be selected.

[0056] The method of suppressing the phenomenon of boiling and drying up in a closed body of the present application can be understood as follows: if a container (i.e., the hollow closed body 9) is filled with water at a certain temperature, the water in the container will be full again only when the temperature is returned to that temperature. If the temperature is lower than that, the water in the container is not full. In other words, water at a lower temperature is added to the container, but not filled up. However, after the container is heated to a certain temperature, the water expands due to the heat and fills up the entire container. In conventional methods, the state of being filled up or not filled up is often understood based on water at room temperature, while the method of suppressing the phenomenon of boiling and drying up in a closed body of the present application focuses on the conditions of liquids at different temperatures and densities, and then uses the fullness or dissipation of the liquid in the container as a standard.

[0057] The method of suppressing boiling and drying up in a closed body of the present application utilizes the general physical concept that liquid is incompressible, and also utilizes the phenomenon of liquid expansion and contraction when it is heated and cooled. As the temperature changes, it forms an elastic body that can be appropriately compressed, and then utilizes the expansion force of the liquid to suppress the boiling and drying up phenomenon.

[0058] On the other hand, the present application also provides an experimental device for suppressing boiling and drying phenomenon in a closed body, such as Figure 2 As shown, the device includes a closed cavity / tube 6, a T-shaped tube 4, a valve, and a heater 1. The closed cavity / tube 6 includes a cavity capable of containing a fluid 7. The T-shaped tube 4 is in communication with the closed cavity / tube 6. The valve includes a first valve 2 and a second valve 3 located on the T-shaped tube 4, and the first valve 2 and the second valve 3 respectively control the filling and discharge of the fluid 7. The heater 1 can heat the closed cavity / tube 6. The closed cavity / tube 6 forms a hollow closed body 9 that is filled or not filled with the fluid 7.

[0059] The experimental device for suppressing boiling and drying in a closed body of the present application is used as an experiment. Liquid is added to the closed cavity / tube 6. The volume of the liquid in the closed cavity / tube 6 decreases after cooling. When the liquid in the closed cavity / tube 6 is heated, it can fill the space of the closed cavity / tube 6. The shape of the closed cavity / tube 6 also facilitates the liquid to be heated and flow in the closed cavity / tube 6, ensuring uniform internal temperature.

[0060] In one embodiment, if Figure 2 As shown, the closed cavity / tube 6 includes a loop tube 61 and a straight tube 62. The loop tube 61 and the straight tube 62 are alternately connected to form an annular loop, and the heater 1 heats the straight tube 62. The loop tube 61 can be in an arc shape.

[0061] There can be two loop pipes 61 and two straight pipes 62, and the trajectory of the loop pipe 61 can be a semicircular arc, and the straight pipe 62 is tangentially connected to the two ends of the loop pipe 61. The loop trajectory of the final closed cavity / tube 6 is similar to the outline of the waist-shaped hole. The heater 1 can be located at the lower half of one of the straight pipes 62.

[0062] In one embodiment, if Figure 2 As shown, the T-shaped tube 4 includes a first straight tube 41 and a second straight tube 42 which are vertically connected to each other, one end of the second straight tube 42 is connected to the loop tube 61, the first valve 2 and the second valve 3 are both located on the first straight tube 41, and the first valve 2 and the second valve 3 are respectively located on both sides of the second straight tube 42.

[0063] In one embodiment, if Figure 2 As shown, a locking block 5 is further provided in the second straight tube 42 , and when the fluid 7 in the closed cavity / tube 6 has a tendency to expand or flow outward, the locking block 5 can block the second straight tube 42 .

[0064] The blocked second straight tube 42 turns the sealed cavity / tube 6 into a hollow closed body 9 that can withstand the internal expansion pressure. The locking block 5 can have the freedom of reciprocating translation, that is, the linear reciprocating motion along the through direction of the second straight tube 42, so as to realize the opening and closing of the second straight tube 42. The locking principle of the locking block 5 can be based on its own outer diameter, that is, the outer diameter of the locking block 5 close to the end of the first straight tube 41 is larger than the inner diameter of the junction of the first straight tube 41 and the second straight tube 42, so that once the fluid 7 in the closed cavity / tube 6 has an outward expansion or flow tendency, the locking block 5 can block the junction of the first straight tube 41 and the second straight tube 42. On the contrary, it does not affect the fluid 7 from being injected and discharged into the sealed cavity / tube 6 along the first straight tube 41 and the second straight tube 42 in sequence. Among them, the first valve 2 and the second valve 3 can be manual valves. When the first valve 2 and the second valve 3 are already provided, the locking block 5 is not necessary and the locking block 5 can be cancelled.

[0065] The locking block 5 further facilitates the closed cavity / tube 6 to form a closable communicating body, and the actual liquid filling amount in the closed cavity / tube 6 is controlled by means of the locking block 5 .

[0066] In one embodiment, the sealed cavity / tube 6 has transparency, or the sealed cavity / tube 6 is opaque but is provided with a transparent observation window.

[0067] In one embodiment, if Figure 3 As shown, the sealed cavity / tube 6 can also be a straight tube, and the straight tube can be a vertical cylindrical tube or the like. The sealed cavity / tube 6 is provided with a pressure detection point 10 and several temperature detection points 11. The pressure detection point 10 is used to monitor the actual pressure value of the liquid in the sealed cavity / tube 6 in real time. The several temperature detection points 11 are convenient for detecting the actual temperature of the liquid in the sealed cavity / tube 6, and can also detect the temperature at different positions, so as to judge the uniformity of the temperature.

[0068] The method of suppressing boiling and drying up in a closed body of the present application can be verified and optimized by means of an experimental device for suppressing boiling and drying up in a closed body. The above embodiments are only for illustrating the technical concept and features of the present application, and their purpose is to enable people familiar with this technology to understand the content of the present application and implement it, and cannot be used to limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit of the present application should be included in the protection scope of the present application.

Claims

1. A method for inhibiting boiling and drying out in a closed body, characterized in that: include: Injecting a fluid (7) having a preset temperature into the cavity of a hollow closed body (9), wherein the hollow closed body (9) is capable of performing internal and external heat exchange; When the preset temperature is equal to or higher than the boiling point of the fluid (7) at standard atmospheric pressure, the fluid (7) will not fill the closed cavity when heated to the boiling point, and will not generate a pressure exceeding the standard atmospheric pressure and the saturated vapor pressure in the hollow closed body (9); When the preset temperature is lower than the boiling point of the fluid (7) at standard atmospheric pressure, after the fluid (7) is heated to the preset temperature, the fluid (7) will fill the cavity and generate a pressure in the cavity that exceeds the standard atmospheric pressure and the saturated vapor pressure of the hollow closed body (9).

2. The method for suppressing boiling and drying out in a closed body according to claim 1, characterized in that: When the preset temperature is lower than the boiling point of the fluid (7) at standard atmospheric pressure, the preset temperature is higher than the temperature of the fluid (7) at maximum density at normal pressure.

3. The method for suppressing boiling and drying out in a closed body according to claim 1, characterized in that: The space in the cavity that is not filled by the fluid (7) forms a cavity (8), and the ratio of the volume of the cavity (8) to the volume of the cavity is a first decimal. The ratio of the volume of the fluid (7) of equal mass at the preset temperature to the volume at the boiling point under standard atmospheric pressure is a second decimal, and the sum of the first decimal and the second decimal is not greater than 1.

4. The method for suppressing boiling and drying out in a closed body according to claim 3, characterized in that: The formula for the first decimal is: The volume of the cavity (8) is V1, the volume of the cavity is V2, and the first decimal is k1; The formula for the second decimal is; Wherein, the volume of the fluid (7) of the same mass at the preset temperature under standard atmospheric pressure is V3, and the volume at the boiling point is V4, and the second decimal is k2; and 5. The method for suppressing boiling and drying out in a closed body according to claim 3, characterized in that: The second decimal is greater than 0.95, the fluid (7) is water, and the preset temperature is 4° C.; and / or The first decimal is 0.035, and the fluid (7) is water.

6. The method for suppressing boiling and drying out in a closed body according to claim 1, characterized in that: The material of the hollow closed body (9) includes metal or non-metal; The fluid (7) comprises an organic liquid or an inorganic liquid.

7. An experimental device for suppressing boiling and drying out in a closed body, characterized in that: include: A closed cavity / tube (6), the closed cavity / tube (6) comprising a cavity capable of containing a fluid (7); A T-shaped tube (4), the T-shaped tube (4) being in communication with the closed cavity / tube (6); A valve, the valve comprising a first valve (2) and a second valve (3) located on the T-shaped pipe (4), the first valve (2) and the second valve (3) respectively controlling the filling and discharge of the fluid (7); A heater (1), wherein the heater (1) is capable of heating the sealed cavity / tube (6); The sealed cavity / tube (6) forms a hollow closed body (9) which is filled or not filled with the fluid (7).

8. The experimental device for suppressing boiling and drying out in a closed body according to claim 7, characterized in that: The sealed cavity / tube (6) is a straight tube or a loop tube, and comprises a loop tube (61) and a straight tube (62). The loop tube (61) and the straight tube (62) are alternately connected to form an annular loop, and the heater (1) heats the straight tube (62).

9. The experimental device for suppressing boiling and drying out in a closed body according to claim 8, characterized in that: The T-shaped pipe (4) comprises a first straight pipe (41) and a second straight pipe (42) which are vertically connected to each other, one end of the second straight pipe (42) is connected to the loop pipe (61), the first valve (2) and the second valve (3) are both located on the first straight pipe (41), and the first valve (2) and the second valve (3) are respectively located on both sides of the second straight pipe (42).

10. The experimental device for suppressing boiling and drying out in a closed body according to claim 7, characterized in that: The sealed cavity / tube (6) is transparent or provided with a transparent observation window; The sealed cavity / tube (6) is provided with a pressure detection point (10) and a plurality of temperature detection points (11).

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