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

Abstract

The invention relates to the technical field of micro-channel heat exchangers, and discloses a visual jet flow micro-channel heat exchanger boiling heat transfer experiment method and device, and the device 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 device and the method, the good light transmission of the glass observation window is utilized, the visual observation research on 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 invention relates to the technical field of microchannel heat exchangers, and in particular to a visualized boiling heat transfer experimental method and device for a jet microchannel heat exchanger. Background Art

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

[0003] Due to its special fluid dynamics characteristics, jet microchannels can effectively promote the mixing and heat exchange of heat transfer media. Boiling heat transfer, as a highly efficient phase change enhanced heat transfer method, combined with jets can further improve the heat transfer efficiency. However, the jet impact process is usually difficult to observe directly, which 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 flow and boiling phenomena in microchannels. However, since jet microchannel heat exchangers need to observe the jet impact and bubble breaking phenomenon, existing technologies often set the visualization window at the top, making it difficult to observe the jet impact phenomenon inside the jet microchannel heat exchanger, and thus difficult to effectively analyze the mechanism behind the phenomenon. Summary of the invention

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

[0006] On the one hand, the present invention provides a visualized jet microchannel heat exchanger boiling heat transfer experimental device, comprising:

[0007] A testing device, comprising a jet microchannel heat exchanger, a packaging component, and an observation window detachably mounted on the packaging component;

[0008] 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;

[0009] 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;

[0010] 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;

[0011] 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;

[0012] A camera device is detachably mounted above the testing device.

[0013] Optionally, 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 arranged above the microchannel layer.

[0014] Optionally, the upper component is connected to the lower component by bolts, and a sealant is provided between the upper component and the lower component;

[0015] 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.

[0016] Optionally, two observation windows are provided, respectively arranged above and on the side of the packaging component, and an observation window package is provided outside the side observation window, and the observation window package is fixed to the upper component on one side by bolts, 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.

[0017] Optionally, 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.

[0018] Optionally, a No. 2 thermocouple with a gradient distribution is provided on the heat collecting column, and a heat insulation component is provided on the outer layer of the heater. The heat insulation component is asbestos or glass fiber and is used to isolate the heat exchange between the external environment and the heater.

[0019] Optionally, the heat exchange 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 exchange working fluid outlet through a pipe, and the other end is connected to the constant temperature water tank through a pipe, the side of the constant temperature water tank away from the liquid storage tank is connected to the flow pump through a pipe, 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 fluid inlet.

[0020] Optionally, heat exchange medium is stored in the liquid storage tank.

[0021] Optionally, the camera device includes a microscope, a high-speed camera and a movable platform, and the jet microchannel boiling process is observed and photographed through an observation window above the upper component.

[0022] Optionally, 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.

[0023] On the other hand, the present invention also proposes an experimental method applied to the above-mentioned visualized jet microchannel heat exchanger boiling heat transfer experimental device, the experimental method comprising:

[0024] Set the heating temperature, heat exchange medium flow rate and inlet temperature;

[0025] The liquid storage tank provides heat exchange medium to flow into the test device to complete the entire heat exchange cycle;

[0026] Observe and record the heat transfer medium flowing through the jet microchannel heat exchanger;

[0027] The data acquisition system collects pressure, temperature, and flow data;

[0028] After the experiment, the heating device and the heat exchange medium circulation device are turned off, and the collected data are analyzed and evaluated.

[0029] Compared with the prior art, the beneficial effect of the present invention is that the present invention provides a visual jet microchannel heat exchanger boiling heat transfer experimental device and its experimental method. The device enables researchers to directly observe the boiling heat transfer process in the jet microchannel by setting the upper and side observation windows. This design is helpful for real-time monitoring and analysis of microscopic boiling phenomena, further improving the intuitiveness of the experiment and the accuracy of the data. The packaging components and observation windows are detachable, which is convenient for replacing and maintaining the components in the experimental device. At the same time, the stability and sealing of the experimental device are ensured by the combined use of bolts and sealants, avoiding the problem of fluid leakage during the experiment. The heating device is equipped with gradient-distributed thermocouples and thermal insulation components, which can achieve precise temperature control and effective heat isolation, reducing experimental errors. In addition, the data acquisition system integrates temperature sensors, pressure sensors and other equipment, which can accurately collect key data in the experimental process and improve the reliability of the experimental results. The experimental method allows researchers to set conditions such as heating temperature, fluid flow rate and inlet temperature according to different experimental requirements. This flexibility makes the device suitable for different research scenarios and has broad 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, which ensures the stable supply and precise control of the heat exchange medium, thereby improving the repeatability of the experiment and the accuracy of the results. The camera device and data acquisition system used in the experiment can record the boiling process in all aspects and analyze the collected data in detail, helping researchers to better understand the boiling heat transfer mechanism in the jet microchannel. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0031] Figure 1 A schematic diagram of the system structure of a visualized jet microchannel heat exchanger boiling heat transfer experimental device provided in an embodiment of the present invention;

[0032] Figure 2 A schematic diagram of the assembly of a jet microchannel boiling heat exchange test device and a heating device provided in an embodiment of the present invention;

[0033] Figure 3 A schematic diagram of the structure of a packaging assembly provided by an embodiment of the present invention;

[0034] Figure 4 A schematic diagram of a heating device provided in an embodiment of the present invention;

[0035] Figure 5A cross-sectional view of a packaging assembly provided by an embodiment of the present invention;

[0036] 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. mobile platform; 5. data acquisition system; 211. heating rod; 212. heating box; 213. insulation component; 214. heat collecting column; 215. bottom plate; 216. No. 2 thermocouple; 111. jet layer; 112. microchannel layer; 121. upper component; 122. lower component; 123. heat exchange medium inlet; 124. heat exchange medium outlet; 125. No. 1 thermocouple; 126 observation window; 127. observation package; 128. groove. DETAILED DESCRIPTION

[0037] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0038] This embodiment aims to solve the problem that the jet impact of the jet microchannel heat exchanger cannot be observed in the existing experimental system. By designing a visualized jet microchannel boiling heat transfer experimental method and device, it can not only realize the direct visualized observation of the jet microchannel boiling heat transfer process, but also provide an experimental platform with simple operation and high test accuracy to promote in-depth research and optimal design of the jet microchannel boiling heat transfer mechanism.

[0039] See also Figure 1 As shown, the embodiment of the present invention provides a visualized jet microchannel heat exchanger boiling heat transfer experimental device, comprising:

[0040] The testing device 1 comprises a fluidic microchannel heat exchanger, a packaging component, and an observation window 126 detachably mounted on the packaging component;

[0041] The packaging component is configured as an upper component 121 and a lower component 122. Two cavities for the flow of heat exchange medium are arranged in the upper component 121, one of which is a heat exchange medium inlet 123, and the other cavity is a heat exchange medium outlet 124. A limiting groove having the same size as the jet microchannel heat exchanger is arranged at the connection between the two cavities, and the jet microchannel heat exchanger is arranged in the limiting groove;

[0042] A heating device, connected to the testing device 1, comprising a power source 22 and a heating element 21, wherein the power source 22 is electrically connected to the heating element 21, and the heating element 21 is disposed below the testing device 1;

[0043] A heat exchange medium circulation device is connected to the upper component 121 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 component 121;

[0044] The data acquisition system 5 is electrically connected to the test device 1 and is used to record and analyze the data acquisition system 5 during the jet microchannel boiling heat transfer experiment;

[0045] A camera device, wherein the camera device is detachably mounted above the testing device 1 .

[0046] 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 .

[0047] In this preferred embodiment, the upper component 121 is connected to the lower component 122 by bolts, and a sealant is provided between the upper component 121 and the lower component 122;

[0048] A thermocouple No. 125 is also arranged between the upper component 121 and the lower component 122. The thermocouple No. 125 is arranged below the jet microchannel heat exchanger, and a through hole is arranged directly below the jet microchannel heat exchanger. The through hole has the same size as the jet microchannel heat exchanger. A groove 128 connected to the heating device is also arranged below the lower component 122.

[0049] In this preferred embodiment, the observation window 126 is arranged above and on the side of the packaging component, and an observation window packaging component 127 is arranged outside the observation window 126 on the side. The observation window packaging component 127 is fixed to the upper component 121 on one side by bolts, and is fixed to the lower component 122 on the other side; the observation window 126 is used to observe the jet microchannel heat exchanger in the jet microchannel boiling heat transfer experiment.

[0050] It can be understood that the core of this experimental device is a test device 1, which consists of a jet microchannel heat exchanger, a packaging component, and an observation window 126 that can be detachably installed on the packaging component. The jet microchannel heat exchanger is the key part of the experiment. It consists of a jet layer 111 and a microchannel layer 112. The two layers are connected by glue, and the jet layer 111 is located above the microchannel layer 112. The packaging component is divided into an upper component 121 and a lower component 122. Two cavities are provided inside the upper component 121, which are used for the inlet and outlet of the heat exchange medium respectively. The two cavities are provided with a limit groove matching the size of the jet microchannel heat exchanger at the connection to ensure that the heat exchanger can be firmly placed in the appropriate position. In order to heat the jet microchannel heat exchanger, the 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 is powered by the power supply 22 to work. The heat exchange medium circulation device is connected to the upper component 121 through a pipeline to form a closed water circuit, so that the heat exchange medium can 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 exchange experiment, including key parameters such as pressure, temperature and flow; the camera device can be detachably installed above the test device 1, and the boiling process inside the jet microchannel heat exchanger can be photographed and observed through the observation window 126. The upper component 121 and the lower component 122 are connected by bolts, and a sealant is set in the middle to ensure the sealing. At the same time, a No. 1 thermocouple 125 is set, located below the jet microchannel heat exchanger, and is in direct contact with the heat exchanger through a through hole for measuring temperature. A groove 128 is also provided below the lower component 122, which is connected to the heating device to provide uniform heating.

[0051] The observation window 126 is arranged above and on the side of the packaging component. The side observation window 126 has a packaging component outside and 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.

[0052] In this preferred embodiment, the heating element 21 includes a heater 212, a heating rod 211, a heat collecting column 214 and a base plate 215. The heating rod 211 is arranged inside the heater 212, and the heat collecting column 214 is arranged above the heater 212 to concentrate the heat generated by the heating rod 211. The top of the heat collecting column 214 is connected to the groove 128 below the lower layer component 122, and the heating rod 211 and the heater 212 are fixedly connected to the base plate 215.

[0053] In this preferred embodiment, a gradient-distributed No. 2 thermocouple 216 is provided on the heat collecting column 214 , and an outer layer of the heater 212 is provided with a heat insulation component 213 , which is asbestos or glass fiber and is used to isolate the heat exchange between the external environment and the heater 212 .

[0054] It is understood that the heat collecting column 214 is a component used to concentrate and transfer heat in the experimental device. 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. The second thermocouple 216 with a gradient distribution is set on the heat collecting column 214, which means that multiple thermocouples are installed at different positions of the heat collecting column 214. These thermocouples can detect the temperature at different positions in the heat collecting column 214 to form a temperature distribution diagram. This is very important for analyzing the transfer path and efficiency of heat in the heat collecting column 214, which can help researchers optimize thermal design and understand temperature changes in different areas. The heater 212 is a device for providing a heat source. In the experiment, the role of the heater 212 is to provide enough heat for the part that needs to be heated so that the experimental conditions meet the requirements. The heat insulation component 213 set on the outer layer of the heater 212 is to reduce the loss of heat. Insulating materials, such as asbestos or glass fiber, have good thermal insulation properties and can effectively isolate the heat exchange between the external environment and the heater 212. By using the heat insulation assembly 213, the heat of the heater 212 is mainly concentrated on the part that needs to be heated during the experiment, and will not be easily dissipated to the outside world. This not only improves the heating efficiency, but also ensures the stability of the experimental conditions and avoids interference of the external environment on the experimental results.

[0055] In this preferred embodiment, the heat exchange working medium 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 medium outlet 124 through a pipeline, and the other end is connected to the constant temperature water tank 32 through a pipeline. The 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, the side of the flow pump 31 away from the constant temperature water tank 32 is connected to the flow meter 34, and the side of the flow meter 34 close to the testing device 1 is connected to the heat exchange working medium inlet 123.

[0056] It is understandable that the flowmeter 34 is used to measure the flow rate of the working fluid through the heat exchange working fluid circulation system. It ensures that researchers can accurately control and monitor the amount of working fluid flowing through the microchannel during the experiment, thereby improving the accuracy and repeatability of the experiment. The flow pump 31 is responsible for driving the heat exchange working fluid to flow throughout the 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 connects other components of the circulation system to ensure sufficient supply of working fluid in the experiment and provides an initial source of working fluid for the system.

[0057] The heat exchange medium starts from the liquid storage tank 33 and enters the constant temperature water tank 32 through the pipeline, where it is heated or cooled to the required experimental temperature. The medium that has passed through the constant temperature water tank 32 then enters the flow pump 31, which pushes the medium to the flow meter 34 to ensure that the medium flows at a set flow rate. The flow meter 34 accurately measures the flow rate of the medium flowing through the system and guides it to the test device 1, where the medium completes the heat exchange process. Finally, the medium after heat exchange flows through the outlet and returns to the liquid storage tank 33 again, completing a cycle. This cycle can continue so that researchers can monitor and analyze the heat exchange process for a long time.

[0058] In this preferred embodiment, the liquid storage tank 33 stores heat exchange medium.

[0059] In this preferred embodiment, the imaging device includes a microscope, a high-speed camera 41 and a movable platform 42, and the jet microchannel boiling process is observed and photographed through the observation window 126 above the upper component 121.

[0060] It is understandable that the microscope is used to observe the boiling process in the jet microchannel in detail. Since the structure and bubble generation and dissipation process in the microchannel are very small, the microscope can provide a magnification function to help researchers observe detailed changes, such as bubble generation, growth and disappearance. The high-speed camera 41 is used to record the boiling phenomenon that occurs rapidly in the jet microchannel. These phenomena often occur in a very short time, and the high-speed camera 41 can capture the rapidly changing details such as bubble dynamics and fluid movement, which is convenient for subsequent slow-motion analysis. The movable platform 42 allows the camera device to flexibly adjust its position to ensure that microchannels at different angles and different parts can be accurately photographed. By adjusting the position of the platform, the most critical experimental area can be captured to enhance the observation effect of the experiment. These camera devices are observed and photographed through the observation window 126 of the upper component 121. The observation window 126 provides a direct field of view, allowing the microscope and the high-speed camera 41 to observe the experimental area in real time. Boiling process Through the combination of the microscope and the high-speed camera 41, researchers can observe the boiling process in the microchannel in detail. This includes complex phenomena such as bubble generation, fusion, and rupture, as well as the flow of liquid in microchannels. 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 heat transfer and fluid flow behavior at the microscale and provide visual support for experimental results.

[0061] The system design allows researchers to grasp 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 in the boiling process more carefully and comprehensively. Through this detailed 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.

[0062] In this preferred embodiment, the data acquisition system 5 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.

[0063] It is understood that the temperature sensor is used to measure the temperature of the heat exchange medium flowing through the jet microchannel heat exchanger during the experiment in real time. This is essential for analyzing the heat transfer performance and boiling process. The pressure sensor is used to monitor the pressure changes of the heat exchange medium in the microchannel. This can help researchers evaluate the flow state and heat transfer efficiency. The data acquisition device, as the central device of the data, is responsible for receiving 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, the two sensors are connected to the data acquisition device via cables to transmit the measurement data in real time. The electrical connection ensures the stability and reliability of the signal, enabling the data acquisition system 5 to obtain accurate experimental data in a timely manner. The data acquisition device is electrically connected to the data processing computer, and the data acquisition device sends the collected temperature and pressure data to the data processing computer. This connection allows the computer to analyze, visualize and store the data, thereby providing a basis for subsequent data analysis. By aggregating data from temperature and pressure sensors to a data processing computer, researchers can use the computer's powerful computing power to perform complex calculations and analyses. This may include trend analysis, performance evaluation, boiling characteristics research, etc.

[0064] In summary, the present invention provides a visual jet microchannel heat exchanger boiling heat transfer experimental device and its experimental method. The device enables researchers to directly observe the boiling heat transfer process in the jet microchannel by setting the upper and side observation windows 126. This design helps to monitor and analyze the microscopic boiling phenomenon in real time, further improving the intuitiveness of the experiment and the accuracy of the data. The packaging component and the observation window 126 are detachable, which is convenient for replacing and maintaining the components in the experimental device. At the same time, the stability and sealing of the experimental device are ensured by the combined use of bolts and sealants, avoiding the problem of fluid leakage during the experiment. The heating device is equipped with a gradient-distributed thermocouple and a heat insulation component 213, which can achieve precise control of temperature and effective heat isolation, reducing experimental errors. In addition, the data acquisition system 5 integrates equipment such as temperature sensors and pressure sensors, which can accurately collect key data during the experiment and improve the reliability of the experimental results. The experimental method allows researchers to set conditions such as heating temperature, fluid flow rate and inlet temperature according to different experimental requirements. This flexibility makes the device suitable for different research scenarios and has a wide range of 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, which ensures the stable supply and precise control of the heat exchange medium, thereby improving the repeatability of the experiment and the accuracy of the results. The camera device and data acquisition system 5 used in the experiment can record the boiling process in all directions and analyze the collected data in detail, helping researchers to better understand the boiling heat transfer mechanism in the jet microchannel.

[0065] See also Figure 2 As shown, the embodiment of the present invention also provides a visual jet microchannel heat exchanger boiling heat transfer experimental method, including:

[0066] Set the heating temperature, heat exchange medium flow rate and inlet temperature;

[0067] The liquid storage tank provides heat exchange medium to flow into the test device to complete the entire heat exchange cycle;

[0068] Observe and record the heat transfer medium flowing through the jet microchannel heat exchanger;

[0069] The data acquisition system collects pressure, temperature, and flow data;

[0070] After the experiment, the heating device and the heat exchange medium circulation device are turned off, and the collected data are analyzed and evaluated.

[0071] In summary, the present invention provides a visualized jet microchannel heat exchanger boiling heat transfer experimental device and an experimental method thereof. The device enables researchers to directly observe the boiling heat transfer process in the jet microchannel by setting observation windows on the upper layer and the side. This design helps to monitor and analyze the microscopic boiling phenomenon in real time, further improving the intuitiveness of the experiment and the accuracy of the data. The packaging components 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, the stability and sealing of the experimental device are ensured by the combined use of bolts and sealants, and the problem of fluid leakage during the experiment is avoided. The heating device is equipped with a gradient-distributed thermocouple and a heat insulation component, which can achieve precise temperature control and effective heat isolation, and reduce experimental errors. In addition, the data acquisition system integrates temperature sensors, pressure sensors and other equipment, which can accurately collect key data in the experimental process and improve the reliability of the experimental results. The experimental method allows researchers to set conditions such as heating temperature, fluid flow rate and inlet temperature according to different experimental requirements. This flexibility makes the device suitable for different research scenarios and has broad 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, which ensures the stable supply and precise control of the heat exchange medium, thereby improving the repeatability of the experiment and the accuracy of the results. The camera device and data acquisition system used in the experiment can record the boiling process in all aspects and analyze the collected data in detail, helping researchers to better understand the boiling heat transfer mechanism in the jet microchannel.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

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 is detachably mounted above the testing device.

2. The visualized jet microchannel heat exchanger boiling heat transfer experimental device according to claim 1 is characterized in that: The jet microchannel heat exchanger comprises a jet layer and a microchannel layer, the jet layer and the microchannel layer are connected by glue, and the jet layer is arranged above the microchannel layer.

3. The visualized jet microchannel heat exchanger boiling heat transfer experimental device according to claim 1 is characterized in that: 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.

4. 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.

5. The visualized jet microchannel heat exchanger boiling heat transfer experimental device according to claim 4 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.

6. 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.

7. The visualized jet microchannel heat exchanger boiling heat transfer experimental device according to claim 6 is characterized in that: The liquid storage tank stores heat exchange medium.

8. 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.

9. 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.

10. A visualized jet microchannel heat exchanger boiling heat transfer experimental method, applied to the visualized jet microchannel boiling heat transfer experimental device described in any one of claims 1 to 9, characterized in that: The method comprises: Set the heating temperature, heat exchange medium flow rate and inlet temperature; The liquid storage tank provides heat exchange medium to flow into the test device to complete the entire heat exchange cycle; Observe and record the heat transfer medium flowing through the jet microchannel heat exchanger; The data acquisition system collects pressure, temperature, and flow data; After the experiment, the heating device and the heat exchange medium circulation device are turned off, and the collected data are analyzed and evaluated.

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