Visual jet flow micro-channel heat exchanger boiling heat transfer experiment device

Abstract

The utility model relates to the technical field of micro-channel heat exchangers, and discloses a visual jet flow boiling heat transfer experimental device for a micro-channel heat exchanger, which comprises a testing device, a heating device connected with the testing device, and a heat exchange working medium circulating device communicated with the testing device, the visual observation device is used for carrying out a boiling heat transfer experiment on the jet flow micro-channel; and the data acquisition system is used for recording and analyzing data in the jet flow micro-channel boiling heat transfer experiment process. The testing device comprises a jet flow micro-channel heat exchanger, a packaging assembly of the jet flow micro-channel heat exchanger and an observation window detachably installed on the packaging assembly. According to the utility model, the good light transmission of the glass observation window is utilized, the visual observation research on the boiling heat transfer of the jet flow micro-channel is realized by virtue of the visual observation device, the operation is convenient, and the test precision is high.

Description

Technical Field

[0001] The utility model relates to the technical field of microchannel heat exchangers, and more specifically, to a visualization jet microchannel heat exchanger boiling heat transfer experimental device. Background Technique

[0002] With the rapid development of modern industry and scientific research, the demand for efficient heat transfer technology is increasing day by day. Among many heat transfer technologies, jet microchannel heat exchangers have received extensive attention due to their compact design, high heat efficiency, and excellent temperature uniformity. However, there are still some limitations in the existing jet microchannel heat exchangers in practical applications, especially the problem that the jet impact and boiling heat transfer during the experiment cannot be observed.

[0003] Due to its special hydrodynamic characteristics, the jet microchannel can effectively promote the mixing and heat exchange of heat transfer working fluids. Boiling heat transfer, as an efficient phase change enhanced heat transfer method, combined with the jet can further improve the heat transfer efficiency. However, since the jet impact process is usually difficult to directly observe, this limits the in-depth understanding of its internal flow and heat transfer mechanism.

[0004] To overcome these challenges, researchers have developed a variety of visualization techniques to observe and analyze the flow and boiling phenomena in microchannels. However, since the jet microchannel heat exchanger needs to observe the jet impact and bubble fragmentation phenomenon, the existing technology often sets the visualization window above, making it difficult to observe the jet impact phenomenon inside the jet microchannel heat exchanger, and thus it is difficult to effectively analyze the mechanism behind the phenomenon. Content of the Utility Model

[0005] In view of this, the utility model proposes a visualization jet microchannel heat exchanger boiling heat transfer experimental device, aiming to solve the problem that the jet impact and boiling heat transfer during the experiment cannot be observed in the current technology.

[0006] On the one hand, a visualization jet microchannel heat exchanger boiling heat transfer experimental device proposed by the utility model includes:

[0007] A test device, including a jet microchannel heat exchanger, a packaging component, and an observation window detachably installed on the packaging component;

[0008] The packaging component is set as an upper component and a lower component. Two cavities for the heat transfer working fluid to flow are arranged in the upper component, one of which is an inlet for the heat transfer working fluid, and the other cavity is an outlet for the heat transfer working fluid. A limiting groove with the same size as the jet microchannel heat exchanger is arranged at the connection of the two cavities, and the jet microchannel heat exchanger is arranged in the limiting groove;

[0009] A heating device, connected to the testing device, includes a power supply and a heating element. The power supply is electrically connected to the heating element, and the heating element is disposed below the testing device.

[0010] A heat transfer working fluid circulation device, connected to the upper component through pipes, and the heat transfer working fluid circulation device forms a closed water circuit through the pipe openings at both ends of the upper component.

[0011] A data acquisition system, electrically connected to the testing device; the data acquisition system is used to record and analyze data during the jet microchannel boiling heat transfer experiment.

[0012] A camera device, detachably installed above the testing device.

[0013] The jet microchannel heat exchanger includes a jet layer and a microchannel layer. The jet layer and the microchannel layer are connected by glue, and the jet layer is disposed above the microchannel layer.

[0014] The upper component and the lower component are connected by bolts, and a sealant is provided between the upper component and the lower component.

[0015] A first thermocouple is also provided between the upper component and the lower component. The first thermocouple is disposed below the jet microchannel heat exchanger, and a through hole is provided directly below the jet microchannel heat exchanger. The through hole has the same size as the jet microchannel heat exchanger. A groove connected to the heating device is also provided below the lower component.

[0016] Optionally, two observation windows are provided, respectively disposed above and on the side of the encapsulation component. An observation window encapsulation piece is provided outside the observation window on the side. The observation window encapsulation piece is fixed to the upper component on one side by bolts and to the lower component on the other side; the observation window is used to observe the jet microchannel heat exchanger during the jet microchannel boiling heat transfer experiment.

[0017] Optionally, the heating element includes a heater, a heating rod, a heat collecting column, and a bottom plate. The heating rod is disposed inside the heater, and the heat collecting column is disposed above the heater for concentrating the heat generated by the heating rod. The upper part of the heat collecting column is connected to the groove below the lower component, and the heating rod and the heater are fixedly connected to the bottom plate.

[0018] Optionally, second thermocouples with a gradient distribution are provided on the heat collecting column, and a heat insulation component is provided outside the heater. The heat insulation component is asbestos or fiberglass, used to isolate the heat exchange between the external environment and the heater.

[0019] Optionally, the heat transfer working fluid circulation device includes a flow meter, a flow pump, a constant temperature water tank and a liquid storage tank. One end of the liquid storage tank is connected to the heat transfer working fluid outlet through a pipeline, and the other end is connected to the constant temperature water tank through a pipeline. The side of the constant temperature water tank away from the liquid storage tank is connected to the flow pump through a pipeline. The side of the flow pump away from the constant temperature water tank is connected to the flow meter, and the side of the flow meter close to the test device is connected to the heat transfer working fluid inlet.

[0020] Optionally, the liquid storage tank stores a heat transfer working fluid.

[0021] Optionally, the imaging device includes a microscope, a high-speed camera and a movable platform, and observes and images the jet microchannel boiling process through the observation window above the upper layer assembly.

[0022] Optionally, the data acquisition system includes a temperature sensor, a pressure sensor, a data collector and a data processing computer. The pressure sensor and the temperature sensor are arranged in the test device, and the pressure sensor and the temperature sensor are electrically connected to the data collector, and the data collector is electrically connected to the data processing computer.

[0023] Compared with the prior art, the beneficial effects of the present utility model are as follows: The present utility model provides a visualization jet microchannel heat exchanger boiling heat transfer experimental device. By setting observation windows on the upper layer and the side, researchers can directly observe the boiling heat transfer process in the jet microchannel. This design helps to monitor and analyze microscopic boiling phenomena in real time, further enhancing the intuitiveness of the experiment and the accuracy of the data. The encapsulation assembly and the observation window adopt a detachable design, which is convenient for replacing and maintaining the components in the experimental device. At the same time, through the combined use of bolts and sealant, the stability and tightness of the experimental device are ensured, avoiding the problem of working fluid leakage during the experiment. The heating device is equipped with thermocouples with a gradient distribution and a heat insulation assembly, which can achieve precise temperature control and effective heat isolation, reducing experimental errors. In addition, the data acquisition system integrates devices such as temperature sensors and pressure sensors, which can accurately collect key data during the experiment, improving the reliability of the experimental results. The experimental method allows researchers to set conditions such as heating temperature, working fluid flow rate and inlet temperature according to different experimental requirements. This flexibility enables the device to be applicable to different research scenarios and has a wide range of application prospects. The experimental device is equipped with a circulation system including a flow meter, a flow pump, a constant temperature water tank and a liquid storage tank, ensuring a stable supply and precise control of the heat transfer working fluid, thereby improving the repeatability of the experiment and the accuracy of the results. The imaging device and the data acquisition system used during the experiment can record the boiling process comprehensively and analyze the collected data in detail, helping researchers better understand the boiling heat transfer mechanism in the jet microchannel. Brief Description of the Drawings

[0024] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present utility model. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0025] Figure 1 is a schematic structural diagram of a visualization jet microchannel heat exchanger boiling heat transfer experimental device system provided by an embodiment of the present utility model;

[0026] Figure 2 is an assembled schematic diagram of a jet microchannel boiling heat transfer test device and a heating device provided by an embodiment of the present utility model;

[0027] Figure 3 is a schematic structural diagram of a packaging component provided by an embodiment of the present utility model;

[0028] Figure 4 is a schematic diagram of a heating device provided by an embodiment of the present utility model;

[0029] Figure 5 is a cross-sectional view of a packaging component provided by an embodiment of the present utility model;

[0030] In the figure, 1, test device; 21, heating element; 22, power supply; 31, flow pump; 32, constant temperature water tank; 33, liquid storage tank; 34, flow meter; 41, camera; 42, moving platform; 5, data acquisition system; 211, heating rod; 212, heating box; 213, heat insulation component; 214, heat collecting column; 215, bottom plate; 216, second thermocouple; 111, jet layer; 112, microchannel layer; 121, upper component; 122, lower component; 123, heat exchange working fluid inlet; 124, heat exchange working fluid outlet; 125, first thermocouple; 126 observation window; 127, observation package; 128, groove. Detailed Embodiments

[0031] Hereinafter, exemplary embodiments of the present disclosure will be described in more detail with reference to the drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art. It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other. Hereinafter, the present utility model will be described in detail with reference to the drawings and in combination with the embodiments.

[0032] This embodiment aims to solve the problem that the jet impingement in the existing experimental system of the jet microchannel heat exchanger cannot be observed. By designing a visualization jet microchannel boiling heat transfer experimental device, it can not only directly visualize and observe the jet microchannel boiling heat transfer process, but also provide an experimental platform with simple operation and high test accuracy to promote the in-depth research and optimized design of the jet microchannel boiling heat transfer mechanism.

[0033] Refer to Figure 1 As shown in the figure, the embodiment of the present utility model provides a visualization jet microchannel heat exchanger boiling heat transfer experimental device, including:

[0034] The test device 1 includes a jet microchannel heat exchanger, a packaging component, and an observation window 126 detachably installed on the packaging component;

[0035] The packaging component is set as an upper component 121 and a lower component 122. Two cavities for the heat transfer working medium to flow are arranged in the upper component 121. One of them is a heat transfer working medium inlet 123, and the other cavity is a heat transfer working medium outlet 124. A limiting groove with the same size as the jet microchannel heat exchanger is arranged at the connection of the two cavities, and the jet microchannel heat exchanger is arranged in the limiting groove;

[0036] The heating device is connected to the test device 1 and includes a power supply 22 and a heating element 21. The power supply 22 is electrically connected to the heating element 21, and the heating element 21 is arranged below the test device 1;

[0037] The heat transfer working medium circulation device is connected to the upper component 121 through a pipeline, and the heat transfer working medium circulation device forms a closed water circuit through the pipeline openings at both ends of the upper component 121;

[0038] The data acquisition system 5 is electrically connected to the test device 1 and is used to record and analyze the data during the jet microchannel boiling heat transfer experiment;

[0039] The camera device is detachably installed above the test device 1.

[0040] In this preferred embodiment, the jet microchannel heat exchanger includes a jet layer 111 and a microchannel layer 112. The jet layer 111 and the microchannel layer 112 are connected by glue, and the jet layer 111 is arranged above the microchannel layer 112.

[0041] In this preferred embodiment, the upper component 121 and the lower component 122 are connected by bolts, and a sealant is arranged between the upper component 121 and the lower component 122;

[0042] A first thermocouple 125 is further provided between the upper component 121 and the lower component 122. The first thermocouple 125 is disposed below the jet microchannel heat exchanger, and a through hole is provided directly below the jet microchannel heat exchanger in the first thermocouple 125. The through hole has the same size as the jet microchannel heat exchanger. A groove 128 connected to the heating device is further provided below the lower component 122.

[0043] In this preferred embodiment, the observation window 126 is disposed above and on the side of the encapsulation component, and an observation window encapsulation member 127 is provided outside the observation window 126 on the side. One side of the observation window encapsulation member 127 is fixed to the upper component 121 by bolts, and the other side is fixed to the lower component 122. The observation window 126 is used to observe the jet microchannel heat exchanger during the jet microchannel boiling heat transfer experiment.

[0044] It can be understood that the core of this experimental device is a test device 1, which consists of a jet microchannel heat exchanger, an encapsulation component, and an observation window 126 that can be detachably installed on the encapsulation component. The jet microchannel heat exchanger is a key part of the experiment. It consists of a jet layer 111 and a microchannel layer 112, and the two layers are connected by glue. The jet layer 111 is located above the microchannel layer 112. The encapsulation component is divided into an upper component 121 and a lower component 122. Two cavities are provided inside the upper component 121, which are respectively used for the inlet and outlet of the heat exchange working medium. A limiting groove matching the size of the jet microchannel heat exchanger is provided at the connection of these two cavities to ensure that the heat exchanger can be stably placed in place. To heat the jet microchannel heat exchanger, this device includes a heating device, which consists of a power supply 22 and a heating element 21. The heating element 21 is located below the test device 1 and operates by being powered by the power supply 22. The heat exchange working medium circulation device is connected to the upper component 121 through a pipeline to form a closed-loop water path, enabling the heat exchange working medium to circulate in the system. The data acquisition system 5 is electrically connected to the test device 1 and is used to record and analyze data during the jet microchannel boiling heat transfer experiment, including key parameters such as pressure, temperature, and flow rate. The camera device can be detachably installed above the test device 1 and is used to photograph and observe the boiling process inside the jet microchannel heat exchanger through the observation window 126. The upper component 121 and the lower component 122 are connected by bolts, and a sealant is provided in the middle to ensure the sealing performance. At the same time, a first thermocouple 125 is provided below the jet microchannel heat exchanger and is in direct contact with the heat exchanger through the through hole, which is used to measure the temperature. A groove 128 is also provided below the lower component 122 and is connected to the heating device to provide uniform heating.

[0045] The observation window 126 is arranged above and on the side of the encapsulation component. There is an encapsulation piece outside the observation window 126 on the side, which is fixed to the upper and lower layer components 122 by bolts, ensuring that the boiling phenomenon inside the jet microchannel heat exchanger can be clearly observed during the experiment.

[0046] In this preferred embodiment, the heating element 21 includes a heater 212, a heating rod 211, a heat collecting column 214, and a bottom plate 215. The heating rod 211 is arranged inside the heater 212, and the heat collecting column 214 is arranged above the heater 212 for concentrating the heat generated by the heating rod 211. The upper part of the heat collecting column 214 is connected to the groove 128 under the lower layer component 122, and the heating rod 211 and the heater 212 are fixedly connected to the bottom plate 215.

[0047] In this preferred embodiment, the heat collecting column 214 is provided with a second thermocouple 216 with a gradient distribution, and the outer layer of the heater 212 is provided with a heat insulation component 213, which is asbestos or fiberglass, for isolating the heat exchange between the external environment and the heater 212.

[0048] It can be understood that the heat collecting column 214 is a component in the experimental device for concentrating and transferring heat. The design of the heat collecting column 214 can optimize the heat transfer efficiency and ensure effective heating or heat collection in the required area. Setting the second thermocouple 216 with a gradient distribution on the heat collecting column 214 means that multiple thermocouples are installed at different positions on the heat collecting column 214. These thermocouples can detect the temperatures at different positions inside the heat collecting column 214 and form a temperature distribution map. This is very important for analyzing the heat transfer path and efficiency in the heat collecting column 214, which can help researchers optimize the thermal design and understand the temperature changes in different regions. The heater 212 is a device for providing a heat source. In the experiment, the function of the heater 212 is to provide sufficient heat for the part that needs to be heated, so that the experimental conditions meet the requirements. The heat insulation component 213 arranged on the outer layer of the heater 212 is to reduce heat loss. Heat insulation materials, such as asbestos or fiberglass, have good heat insulation performance and can effectively isolate the heat exchange between the external environment and the heater 212. By using the heat insulation component 213, the heat of the heater 212 in the experiment is mainly concentrated in the part that needs to be heated and will not easily dissipate to the outside. This not only improves the heating efficiency but also ensures the stability of the experimental conditions and avoids the interference of the external environment on the experimental results.

[0049] In this preferred embodiment, the heat exchange working fluid circulation device includes a flow meter 34, a flow pump 31, a constant temperature water tank 32, and a liquid storage tank 33. One end of the liquid storage tank 33 is connected to the heat exchange working fluid outlet 124 through a pipeline, and the other end is connected to the constant temperature water tank 32 through a pipeline. One side of the constant temperature water tank 32 away from the liquid storage tank 33 is connected to the flow pump 31 through a pipeline. One side of the flow pump 31 away from the constant temperature water tank 32 is connected to the flow meter 34. One side of the flow meter 34 close to the test device 1 is connected to the heat exchange working fluid inlet 123.

[0050] It can be understood that the flow meter 34 is used to measure the flow rate of the working fluid passing through the heat exchange working fluid circulation system. It ensures that researchers can precisely control and monitor the amount of working fluid flowing through the microchannel in the experiment, thereby improving the accuracy and repeatability of the experiment. The flow pump 31 is responsible for pushing the heat exchange working fluid to flow in the entire circulation system. The function of the flow pump 31 is to provide sufficient pressure and flow rate so that the working fluid can circulate effectively and achieve heat exchange through the test device 1. The constant temperature water tank 32 is used to maintain the temperature of the working fluid constant. The constant temperature water tank 32 ensures that the working fluid entering the microchannel remains within the set temperature range by adjusting the water temperature, thereby providing stable temperature conditions for the experiment. The liquid storage tank 33 is used to store and prepare the heat exchange working fluid. It is connected to other components of the circulation system to ensure an adequate supply of working fluid in the experiment and provide an initial source of working fluid for the system.

[0051] The heat exchange working fluid starts from the liquid storage tank 33, enters the constant temperature water tank 32 through a pipeline, and is heated or cooled to the required experimental temperature in the constant temperature water tank 32. The working fluid passing through the constant temperature water tank 32 then enters the flow pump 31, and the flow pump 31 pushes the working fluid to the flow meter 34 to ensure that the working fluid flows at a set flow rate. The flow meter 34 precisely measures the flow rate of the working fluid flowing through the system and guides it to the test device 1, where the working fluid completes the heat exchange process. Finally, the heat-exchanged working fluid flows through the outlet and returns to the liquid storage tank 33 again to complete a cycle. This cycle can continue so that researchers can monitor and analyze the heat exchange process for a long time.

[0052] In this preferred embodiment, the liquid storage tank 33 stores the heat exchange working fluid.

[0053] In this preferred embodiment, the imaging device includes a microscope, a high-speed camera 41, and a movable platform 42, and observes and images the jet microchannel boiling process through the observation window 126 above the upper layer component 121.

[0054] It can be understood that the microscope is used for fine observation of the boiling process in the jet microchannel. Since the structure in the microchannel and the processes of bubble generation and dissipation are very tiny, the microscope can provide a magnification function to help researchers observe the detailed changes, such as the generation, growth, and disappearance of bubbles. The high-speed camera 41 is used to record the rapid boiling phenomena occurring in the jet microchannel. These phenomena often occur in an extremely short time, and the high-speed camera 41 can capture the details of rapid changes such as bubble dynamics and fluid motion, facilitating subsequent slow-motion analysis. The movable platform 42 enables the imaging device to flexibly adjust its position to ensure accurate shooting of the microchannel at different angles and different parts. By adjusting the position of the platform, the most critical experimental area can be captured, improving the observation effect of the experiment. These imaging devices observe and shoot through the observation window 126 of the upper component 121. The observation window 126 provides a direct view, enabling the microscope and the high-speed camera 41 to observe the experimental area in real time. Through the combination of the microscope and the high-speed camera 41 during the boiling process, researchers can observe the boiling process in the microchannel in detail. This includes complex phenomena such as bubble generation, coalescence, rupture, and the flow of liquid in the microchannel. The image data captured by the high-speed camera 41 can be recorded for playback and analysis after the experiment. These image data can help researchers better understand the heat transfer and fluid flow behaviors at the microscale, providing visual support for the experimental results.

[0055] The system is designed such that researchers can master the complex heat transfer process in the microchannel through real-time observation and high-speed recording. Compared with traditional experimental devices, this system can capture the dynamic changes of microscopic phenomena during the boiling process more meticulously and comprehensively. Through such fine observation, researchers can analyze the heat transfer characteristics in the microchannel more deeply, thereby improving the accuracy of the experiment and the reliability of the results.

[0056] In this preferred embodiment, the data acquisition system 5 includes a temperature sensor, a pressure sensor, a data collector, and a data processing computer. The pressure sensor and the temperature sensor are disposed in the test device, and the pressure sensor and the temperature sensor are electrically connected to the data collector, and the data collector is electrically connected to the data processing computer.

[0057] It is understandable that the temperature sensor is used to measure in real time the temperature of the heat transfer working fluid flowing through the jet microchannel heat exchanger during the experiment. This is crucial for analyzing the heat transfer performance and the boiling process. The pressure sensor is used to monitor the pressure change of the heat transfer working fluid in the microchannel. This can help researchers evaluate the flow state and the heat transfer efficiency. The data collector, as the central device for data, is responsible for receiving the signals from the temperature sensor and the pressure sensor, and processing and storing these signals. The data processing computer is used to further analyze and process the collected data. It can run specialized software to generate experimental results, charts, and reports. The electrical connection of the pressure sensor and the temperature sensor. These two sensors are connected to the data collector via cables to transmit the measurement data in real time. The electrical connection ensures the stability and reliability of the signals, enabling the data acquisition system 5 to obtain accurate experimental data in a timely manner. The electrical connection between the data collector and the data processing computer. The data collector sends the collected temperature and pressure data to the data processing computer. This connection allows the computer to analyze, visualize, and store the data, thus providing a basis for subsequent data analysis. By aggregating the data of the temperature and pressure sensors to the data processing computer, researchers can utilize the powerful computing capabilities of the computer to perform complex calculations and analyses. This may include trend analysis, performance evaluation, boiling characteristic research, etc.

[0058] In summary, the present utility model provides a visualization jet microchannel heat exchanger boiling heat transfer experimental device. By setting the observation windows 126 on the upper layer and the side, researchers can directly observe the boiling heat transfer process in the jet microchannel. This design helps to monitor and analyze microscopic boiling phenomena in real time, further enhancing the intuitiveness of the experiment and the accuracy of the data. The encapsulation component and the observation window 126 are designed to be detachable, facilitating the replacement and maintenance of the components in the experimental device. At the same time, through the combined use of bolts and sealant, the stability and sealing of the experimental device are ensured, avoiding the problem of working fluid leakage during the experiment. The heating device is equipped with thermocouples with a gradient distribution and a heat insulation component 213, which can achieve precise temperature control and effective heat isolation, reducing experimental errors. In addition, the data acquisition system 5 integrates devices such as temperature sensors and pressure sensors, which can accurately collect key data during the experiment, improving the reliability of the experimental results. The experimental method allows researchers to set conditions such as heating temperature, working fluid flow rate, and inlet temperature according to different experimental requirements. This flexibility enables the device to be applicable to different research scenarios and has broad application prospects. The experimental device is equipped with a circulation system including a flow meter 34, a flow pump 31, a constant temperature water tank 32, and a liquid storage tank 33, ensuring the stable supply and precise control of the heat exchange working fluid, thereby improving the repeatability of the experiment and the accuracy of the results. The camera device and the data acquisition system 5 used during the experiment can record the boiling process comprehensively and analyze the collected data in detail, helping researchers better understand the boiling heat transfer mechanism in the jet microchannel.

[0059] Referring to Figure 2 as shown, the embodiment of the present utility model also provides a visualization jet microchannel heat exchanger boiling heat transfer experimental method, including:

[0060] Setting the heating temperature, the flow rate of the heat exchange working fluid, and the inlet temperature;

[0061] The liquid storage tank provides the heat exchange working fluid to flow into the test device to complete the entire heat exchange cycle;

[0062] Observing and recording the heat exchange working fluid flowing through the jet microchannel heat exchanger;

[0063] The data acquisition system collects pressure, temperature, and flow rate data;

[0064] After the experiment, turn off the heating device and the heat exchange working fluid circulation device, and analyze and evaluate the collected data.

[0065] In summary, the present utility model provides a visualization jet microchannel heat exchanger boiling heat transfer experimental device. By setting observation windows on the upper layer and the side, researchers can directly observe the boiling heat transfer process in the jet microchannel. This design helps to monitor and analyze microscopic boiling phenomena in real time, further enhancing the intuitiveness of the experiment and the accuracy of the data. The encapsulation component and the observation window adopt a detachable design, facilitating the replacement and maintenance of components in the experimental device. At the same time, through the combined use of bolts and sealant, the stability and sealing of the experimental device are ensured, avoiding the problem of working medium leakage during the experiment. The heating device is equipped with thermocouples with a gradient distribution and a heat insulation component, which can achieve precise temperature control and effective heat isolation, reducing experimental errors. In addition, the data acquisition system integrates devices such as temperature sensors and pressure sensors, capable of accurately collecting key data during the experiment, enhancing the reliability of the experimental results. The experimental method allows researchers to set conditions such as heating temperature, working medium flow rate, and inlet temperature according to different experimental requirements. This flexibility enables the device to be applicable to different research scenarios and has broad application prospects. The experimental device is equipped with a circulation system including a flowmeter, a flow pump, a constant temperature water tank, and a liquid storage tank, ensuring the stable supply and precise control of the heat exchange working medium, thereby improving the repeatability of the experiment and the accuracy of the results. The camera device and the data acquisition system used during the experiment can record the boiling process comprehensively and analyze the collected data in detail, helping researchers better understand the boiling heat transfer mechanism in the jet microchannel.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them. Although the present utility model has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent replacements can still be made to the specific embodiments of the present utility model. Any modification or equivalent replacement that does not depart from the spirit and scope of the present utility model shall be covered by the protection scope of the claims of the present utility model.

Claims

1. A visualized jet microchannel heat exchanger boiling heat transfer experimental device, characterized in that: include: A testing device, comprising a jet microchannel heat exchanger, a packaging component, and an observation window detachably mounted on the packaging component; The packaging component is configured as an upper component and a lower component, wherein the upper component is provided with two cavities for the flow of heat exchange medium, one of which is the heat exchange medium inlet, and the other cavity is the heat exchange medium outlet, and a limiting groove having the same size as the jet microchannel heat exchanger is provided at the connection between the two cavities, and the jet microchannel heat exchanger is arranged in the limiting groove; The observation windows are provided with two, which are respectively provided above and on the side of the packaging component, and an observation window packaging part is provided outside the observation window on the side, and the observation window packaging part is fixed to the upper component by bolts on one side and fixed to the lower component on the other side; the observation window is used to observe the jet microchannel heat exchanger in the jet microchannel boiling heat transfer experiment; A heating device, connected to the testing device, comprising a power source and a heating element, wherein the power source is electrically connected to the heating element, and the heating element is disposed below the testing device; A heat exchange medium circulation device is connected to the upper layer component through a pipeline, and the heat exchange medium circulation device forms a closed loop waterway through the pipeline openings at both ends of the upper layer component; A data acquisition system is electrically connected to the test device; the data acquisition system is used to record and analyze the data acquisition system during the jet microchannel boiling heat transfer experiment; A camera device, which is detachably mounted above the testing device; The jet microchannel heat exchanger comprises a jet layer and a microchannel layer, wherein the jet layer and the microchannel layer are connected by glue, and the jet layer is arranged above the microchannel layer; The upper component is connected to the lower component by bolts, and a sealant is provided between the upper component and the lower component; A No. 1 thermocouple is also arranged between the upper component and the lower component. The No. 1 thermocouple is arranged below the jet microchannel heat exchanger, and the No. 1 thermocouple is provided with a through hole directly below the jet microchannel heat exchanger. The through hole has the same size as the jet microchannel heat exchanger. A groove connected to the heating device is also arranged below the lower component.

2. The visualized jet microchannel heat exchanger boiling heat transfer experimental device according to claim 1 is characterized in that: The heating element includes a heater, a heating rod, a heat collecting column and a base plate. The heating rod is arranged inside the heater, and the heat collecting column is arranged above the heater to concentrate the heat generated by the heating rod. The top of the heat collecting column is connected to the groove below the lower component, and the heating rod and the heater are fixedly connected to the base plate.

3. The visualized jet microchannel heat exchanger boiling heat transfer experimental device according to claim 2 is characterized in that: The heat collecting column is provided with a No. 2 thermocouple with gradient distribution, and the outer layer of the heater is provided with a heat insulation component, which is asbestos or glass fiber and is used to isolate the heat exchange between the external environment and the heater.

4. The visualized jet microchannel heat exchanger boiling heat transfer experimental device according to claim 1 is characterized in that: The heat exchange working medium circulation device includes a flow meter, a flow pump, a constant temperature water tank and a liquid storage tank. One end of the liquid storage tank is connected to the heat exchange working medium outlet through a pipeline, and the other end is connected to the constant temperature water tank through a pipeline. The side of the constant temperature water tank away from the liquid storage tank is connected to the flow pump through a pipeline, the side of the flow pump away from the constant temperature water tank is connected to the flow meter, and the side of the flow meter close to the testing device is connected to the heat exchange working medium inlet.

5. The visualized jet microchannel heat exchanger boiling heat transfer experimental device according to claim 4 is characterized in that: The liquid storage tank stores heat exchange medium.

6. The visualized jet microchannel heat exchanger boiling heat transfer experimental device according to claim 1 is characterized in that: The camera device comprises a microscope, a high-speed camera and a movable platform, and observes and films the jet microchannel boiling process through an observation window above the upper component.

7. The visualized jet microchannel heat exchanger boiling heat transfer experimental device according to claim 1 is characterized in that: The data acquisition system includes a temperature sensor, a pressure sensor, a data acquisition device and a data processing computer. The pressure sensor and the temperature are arranged in the testing device, and the pressure sensor and the temperature sensor are electrically connected to the data acquisition device, and the data acquisition device is electrically connected to the data processing computer.

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