Heat pipe multi-dip-angle visual temperature synchronous acquisition system and test method

Abstract

The invention discloses a heat pipe multi-dip-angle visual temperature synchronous acquisition system and a test method, and relates to the technical field of heat pipe heat transfer elements. The system comprises a power supply module, cooling water bath equipment, a temperature sensor, a data acquisition module, a 360-degree rotatable rack, a high-speed camera, a computer, a heater and a cooling water block, wherein the power supply module is used for providing electric energy for the heater, the cooling water bath equipment is used for cooling circulating cooling water and controlling the temperature, the temperature sensor is used for collecting the temperature of a to-be-tested sample piece and the temperature of a cooling water inlet and outlet, and the to-be-tested sample piece is placed on the 360-degree rotatable rack and is used for providing a multi-dip-angle working condition test of rotating around a shaft by 360 degrees; the high-speed camera is used for providing image acquisition and real-time observation; the heater is used for providing a heat source for a to-be-tested sample, and the cooling water block is used for providing a cold source for the to-be-tested sample; and a 360-degree rotatable rack for bearing a test sample piece is autonomously designed. According to the invention, synchronous analysis and acquisition of temperature and fluid flow can be realized.

Description

Technical Field

[0001] The invention relates to the technical field of heat pipe heat transfer elements, and in particular to a heat pipe multi-inclination angle visualized temperature synchronous acquisition system and a testing method. Background Art

[0002] Heat pipe technology, including loop heat pipes, pulsating heat pipes, capillary wick heat pipes, thermosiphon heat pipes, and uniform temperature plates, has become an essential heat conduction component in the development of high-performance technology. As a direct means of analyzing the flow of working fluids in heat pipes, visualization research is an effective method for analyzing the working mechanism of heat pipes. With the assistance of high-speed visualization equipment, the instantaneous flow state of the working fluid in the pipe can be captured, thereby more intuitively revealing the flow state transition of the fluid inside the heat pipe, and achieving targeted optimization and mechanism analysis. Secondly, as a conventional three-end (heat absorbing end, heat releasing end, and adiabatic section) temperature signal analysis, it can clearly show the performance and temperature change law of the heat pipe, and measure the thermal performance of the heat pipe.

[0003] The existing experimental analysis system generally adopts a step-by-step research method, namely visualization and asynchronous analysis of temperature signals. The advantage of this method is that the system is simple and easy to operate. However, under special working conditions, the temperature signal characteristic analysis corresponding to the instantaneous flow state change of the working fluid requires the participation of two experimental methods at the same time. In addition, the flow state of some special working fluids is random, and traditional asynchronous analysis methods are no longer applicable. Summary of the invention

[0004] In view of the above problems, the present invention proposes a heat pipe multi-angle visualized temperature synchronous acquisition system and testing method, in an effort to solve or alleviate one or more of the above problems.

[0005] According to one aspect of the present invention, a heat pipe multi-angle visualized temperature synchronous acquisition system is provided, the system comprising:

[0006] Power module 1, cooling water bath equipment 2, temperature sensor 3, data acquisition module 4, 360° rotatable stand 5, high-speed camera 6, computer 7, heater 8, cooling water block 9; wherein,

[0007] The power module 1 is connected to the computer 7 and the heater 8 respectively, and is used to provide electric energy to the heater 8;

[0008] The cooling water bath equipment 2 is connected to the cooling water block 9 and is used to cool and control the temperature of the circulating cooling water;

[0009] The temperature sensor 3 is connected to the data acquisition module 4 and the cooling water block 9 respectively, and is used to collect the temperature of the sample to be tested and the inlet and outlet temperatures of the cooling water, and convert the temperature signal into an electrical signal and output it to the data acquisition module 4;

[0010] The data acquisition module 4 is connected to the computer 7 and the temperature sensor 3 respectively, and is used to convert the received electrical signal into a digital signal and output it to the computer 7;

[0011] The 360° rotatable stand 5 is provided with a sample to be tested, and is used to provide a multi-angle working condition test in which the sample to be tested rotates 360° around an axis;

[0012] The high-speed camera 6 is fixedly placed on a bracket on a 360° rotatable stand 5, and is connected to a computer 7 for providing image acquisition and real-time observation;

[0013] The computer 7 is used to receive the temperature data and the image data, and process and analyze the temperature data and the image data;

[0014] The heater 8 and the cooling water block 9 are both connected to the sample to be tested. The heater 8 is used to provide a heat source for the sample to be tested; and the cooling water block 9 is used to provide a cold source for the sample to be tested.

[0015] Furthermore, the temperature sensor 3 includes a first temperature sensor and a second temperature sensor, wherein the first temperature sensor is connected to the cooling water block 9 for collecting the inlet and outlet temperatures of the cooling water block 9; the second temperature sensor is connected to the surface of the sample to be tested for collecting the surface temperature of the sample to be tested.

[0016] Further, the 360° rotatable gantry 5 includes a base 51, two optical axis support fixing seats 52, three metal rods 53, a support plate 54, three linear optical axes, an aluminum plate 56, an optical axis support fixing seat 57, two axis fixing seats 59, two cross-axis connected small fixing blocks 510, and three cross-axis connected large fixing blocks 511; wherein the three linear optical axes include a horizontal beam linear optical axis 551 and two vertical linear optical axes 552;

[0017] The base 51 is connected to two vertical linear optical axes 552 through two axis fixing seats 59 to form a bottom support frame; a crossbeam linear optical axis 551 is used as a crossbeam and is movably connected to the two vertical linear optical axes 552 on the bottom support frame through two cross axes to realize rotation and up and down movement; the support plate 54 is connected to the crossbeam linear optical axis 551 through two optical axis bracket fixing seats 52 to realize the up and down and rotation movement of the sample to be tested; the optical axis bracket fixing seat 57 is connected to the aluminum plate 56 to form a bracket supporting the high-speed camera 6; three metal rods 53 are cross-connected by connecting the small fixing block 510 through a cross axis and form a high-speed camera moving bracket together with the aluminum plate 56 and the optical axis bracket fixing seat 57 to realize the rotation and left and right up and down movement of the high-speed camera 6, and are connected to the large fixing block 511 through a cross axis to connect with the crossbeam linear optical axis 551 to realize the synchronous rotation of the high-speed camera 6 and the support plate 54.

[0018] Furthermore, the 360° rotatable stand 5 also includes a transparent heat-insulating cover 58, which is used to surround and protect the sample to be tested, and plays a heat-insulating and visual function.

[0019] Furthermore, the system also includes an LED fill light, which is used to increase the amount of light entering the camera during the shooting process of the high-speed camera 6.

[0020] Furthermore, the power module 1 is a DC power supply or an AC power supply; the cooling water bath equipment 2 includes a water chiller or an air cooler; and the heater 8 includes a ceramic heating plate or a heating wire.

[0021] Furthermore, the sample to be tested includes a capillary heat pipe, a pulsating heat pipe or a temperature homogenizing plate.

[0022] According to another aspect of the present invention, a heat pipe multi-angle visualized temperature synchronous acquisition test method is proposed, and the method is implemented based on the heat pipe multi-angle visualized temperature synchronous acquisition system described above, and the method includes:

[0023] The sample to be tested is placed on a 360° rotatable stand 5, the heater 8 is installed at the hot end of the sample to be tested, and the cooling water block 9 is installed at the cold end of the sample to be tested;

[0024] The computer 7 is used to set different cooling water temperatures, input power of the power module 1, and shooting parameters of the high-speed camera 6, and to adjust the inclination angle of the 360° rotatable platform 5;

[0025] Corresponding to different cooling water temperatures, different input powers of the power module 1, and different inclination angles, multiple sets of temperature data are collected, and the temperature data include the inlet and outlet temperatures of the cooling water block 9 and the surface temperature of the sample to be tested;

[0026] Based on the multiple sets of temperature data, the computer 7 is used to process the data and perform experimental analysis to obtain the performance and temperature variation law of the heat pipe;

[0027] Multiple sets of image data are collected corresponding to different cooling water temperatures, different input powers of the power module 1, and different inclination angles, and based on the multiple sets of image data, image processing and experimental analysis are performed using a computer 7 to compare and obtain the required changes in the working fluid flow to be observed.

[0028] Furthermore, the data processing performed by computer 7 based on multiple sets of temperature data includes heat leakage calculation, thermal resistance calculation, and thermal conductivity calculation; wherein the formula for heat leakage calculation is:

[0029] q loss =Q-cm(T2-T1)

[0030] In the formula, Q represents the output power of the power supply; c represents the specific heat of cooling water, m represents the flow rate of cooling water; T2 represents the outlet temperature of the cooling water block, and T1 represents the inlet temperature of the cooling water block;

[0031] The formula for calculating the thermal resistance is:

[0032]

[0033] In the formula, ΔT represents the difference between the average temperature of the hot end and the cold end of the sample to be tested;

[0034] The formula for calculating the thermal conductivity is:

[0035] k=[cm(T2-T1)L] / (AΔT)

[0036] Where L is the heat transfer length of the sample to be tested; A represents the heat transfer cross-sectional area of ​​the sample to be tested.

[0037] Furthermore, the inclination adjustment range of the 360° rotatable stand 5 is 0-90°, wherein the inclination is 90° when the heat transfer direction of the sample to be tested is perpendicular to the horizontal plane.

[0038] The beneficial technical effects of the present invention are:

[0039] The present invention proposes a heat pipe multi-angle visualized temperature synchronous acquisition system and test method, the system includes a power module, a cooling water bath device, a temperature sensor, a data acquisition module, a 360° rotatable stand, a high-speed camera, a computer, a heater, and a cooling water block; wherein, the 360° rotatable stand for carrying the test sample is independently designed, and the 360° rotatable experimental stand can be used to realize signal acquisition and analysis at any inclination angle. The present invention can realize temperature signal analysis and acquisition (single temperature signal acquisition); fluid flow visualization observation analysis and acquisition (single flow analysis); temperature and fluid flow synchronous analysis and acquisition; signal acquisition and analysis under any thermal conditions, including constant / variable heating power, constant / variable cooling temperature, and constant / variable cooling water flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, in which:

[0041] Figure 1 It is a structural schematic diagram of a heat pipe multi-angle visualized temperature synchronous acquisition system described in an embodiment of the present invention.

[0042] Figure 2 It is a structural front view of a 360° rotatable stand 5 in an embodiment of the present invention.

[0043] Figure 3 It is a right side view and a rear view of the structure of the 360° rotatable stand 5 in the embodiment of the present invention.

[0044] Figure 4 2 is a diagram showing an example of physical connection of a system in an embodiment of the present invention.

[0045] Figure 5 It is a logical process diagram of conducting experiments using the system in an embodiment of the present invention.

[0046] Figure 6 It is a test flow chart in an embodiment of the present invention.

[0047] Figure 7 It is a comparison diagram of the actual transferred heat calculated by the inlet and outlet temperature difference of the cooling water and the power input heat in the embodiment of the present invention.

[0048] Figure 8 It is a graph of thermal resistance changes under various working conditions obtained by processing the temperature signals of the hot and cold ends of the sample in the embodiment of the present invention.

[0049] Fig. 9 It is a graph of thermal conductivity variation under various working conditions obtained by processing the temperature signals of the hot and cold ends of the sample and the geometric parameters in the embodiment of the present invention.

[0050] Fig.10 It is an analysis diagram of the hot end flow pattern transition process obtained by image processing in an embodiment of the present invention.

[0051] Fig.11 It is a diagram of the change of liquid plug velocity in each working condition obtained by image acquisition in an embodiment of the present invention. DETAILED DESCRIPTION

[0052] The principles and spirit of the present invention will be described below with reference to several exemplary embodiments. It should be understood that these embodiments are provided only to enable those skilled in the art to better understand and implement the present invention, and are not intended to limit the scope of the present invention in any way. On the contrary, these embodiments are provided to make the present disclosure more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art.

[0053] Those skilled in the art know that the embodiments of the present invention can be implemented as a system, device, equipment, method or computer program product. Therefore, the present disclosure can be specifically implemented in the following forms, namely: complete hardware, complete software (including firmware, resident software, microcode, etc.), or a combination of hardware and software. In this article, it is to be understood that any number of elements in the drawings is for illustration and not limitation, and any naming is only for distinction and does not have any limiting meaning.

[0054] The embodiment of the present invention provides a heat pipe multi-angle visual temperature synchronous acquisition system, such as Figures 1 to 3 As shown, the system includes:

[0055] Power module 1, cooling water bath equipment 2, temperature sensor 3, data acquisition module 4, 360° rotatable stand 5, high-speed camera 6, computer 7, heater 8, cooling water block 9; wherein,

[0056] The power module 1 is connected to the computer 7 and the heater 8 respectively, and is used to provide electric energy to the heater 8;

[0057] The cooling water bath equipment 2 is connected to the cooling water block 9 and is used to cool and control the temperature of the circulating cooling water;

[0058] The temperature sensor 3 is connected to the data acquisition module 4 and the cooling water block 9 respectively, and is used to collect the temperature of the sample to be tested and the inlet and outlet temperatures of the cooling water, and convert the temperature signal into an electrical signal and output it to the data acquisition module 4;

[0059] The data acquisition module 4 is connected to the computer 7 and the temperature sensor 3 respectively, and is used to convert the received electrical signal into a digital signal and output it to the computer 7;

[0060] The 360° rotatable stand 5 is provided with a sample to be tested, and is used to provide a multi-angle working condition test in which the sample to be tested rotates 360° around an axis;

[0061] The high-speed camera 6 is fixedly placed on a bracket on a 360° rotatable stand 5, and is connected to a computer 7 for providing image acquisition and real-time observation;

[0062] The computer 7 is used to receive the temperature data and the image data, and process and analyze the temperature data and the image data;

[0063] The heater 8 and the cooling water block 9 are both connected to the sample to be tested. The heater 8 is used to provide a heat source for the sample to be tested; and the cooling water block 9 is used to provide a cold source for the sample to be tested.

[0064] In this embodiment, optionally, the temperature sensor 3 includes a first temperature sensor and a second temperature sensor, wherein the first temperature sensor is connected to the cooling water block 9 and is used to collect the inlet and outlet temperatures of the cooling water block 9; the second temperature sensor is connected to the surface of the sample to be tested and is used to collect the surface temperature of the sample to be tested.

[0065] In this embodiment, optionally, the 360° rotatable gantry 5 includes a base 51, two optical axis bracket fixing seats 52, three metal rods 53, a support plate 54, three linear optical axes (including two vertical linear optical axes 552 and one horizontal beam linear optical axis 551), an aluminum plate 56, an optical axis bracket fixing seat 57, two axis fixing seats 59, two cross-axis connected small fixing blocks 510, and three cross-axis connected large fixing blocks 511; wherein,

[0066] The base 51 is connected to two vertical linear optical axes 552 through two axis fixing seats 59 to form a bottom support frame; a crossbeam linear optical axis 551 is used as a crossbeam and is movably connected to the two vertical linear optical axes 552 on the bottom support frame through two cross axes to realize rotation and up and down movement; the support plate 54 is connected to the crossbeam linear optical axis 551 through two optical axis bracket fixing seats 52 to realize the up and down and rotation movement of the sample to be tested; the optical axis bracket fixing seat 57 is connected to the aluminum plate 56 to form a bracket supporting the high-speed camera 6; three metal rods 53 are cross-connected by connecting the small fixing block 510 through a cross axis and form a high-speed camera moving bracket together with the aluminum plate 56 and the optical axis bracket fixing seat 57 to realize the rotation and left and right up and down movement of the high-speed camera 6, and are connected to the large fixing block 511 through a cross axis to connect with the crossbeam linear optical axis 551 to realize the synchronous rotation of the high-speed camera 6 and the support plate 54.

[0067] In this embodiment, optionally, the 360° rotatable stand 5 also includes a transparent insulation cover 58, which can be acrylic, glass or other transparent materials with low thermal conductivity, used to surround and protect the test sample, and play a dual function of insulation and visibility.

[0068] In this embodiment, optionally, the system further includes an LED fill light, and the LED fill light is used to increase the amount of light entering the camera during the shooting process of the high-speed camera 6.

[0069] In this embodiment, optionally, the power module 1 is a DC power supply or an AC power supply; the cooling water bath equipment 2 includes a water chiller or an air cooler; and the heater 8 includes a ceramic heating plate or a heating wire.

[0070] In this embodiment, optionally, the sample to be tested includes a capillary heat pipe, a pulsating heat pipe or a temperature homogenizing plate.

[0071] According to an embodiment of the present invention, the power supply module 1 can be any power supply module, including a DC power supply or an AC power supply such as a transformer or a switching power supply. The power supply module 1 is connected to the computer 7 through a serial port and is connected to the heater 8, and is used to provide electrical energy for the heater 8; the cooling water bath device 2 can be a water chiller, or an air cooler or other device that can perform circulating water cooling, which is connected to the computer 7 through a serial port and is connected to the cooling water bath device 2 through an internal physical interface, and is used to cool and control the temperature of the circulating cooling water; the temperature sensor 3 is directly connected to the data acquisition module 4, and is used to convert the temperature signal into an electrical signal for the data acquisition module 4 to read; the data acquisition module 4 is connected to the computer 7 through a serial port, and is used to convert the collected temperature analog model into a digital model for Computer 7 reads; high-speed camera 6 is connected to computer 7 through a serial port, which is used to provide image capture and real-time observation; heater 8 can be a ceramic heating plate or a heating wire or any other electronic device that can provide a heat source, connected to the positive and negative electrodes of the power module 1, which is used to provide a heat source for the test sample; cooling water block 9, which is connected to the test sample in the form of surface bonding, is used to provide a cold source for the test sample, and the inlet and outlet of the cooling water block 9 are respectively installed with PT1000 temperature sensors (i.e., the first temperature sensor, used to measure the temperature difference of the cooling water after heat exchange); LED fill light, connected to the power supply through the positive and negative electrodes, the power supply here can be 220V household electricity, or it can be other power modules, which is used to increase exposure and increase the amount of light entering the camera during the shooting process of the high-speed camera 6.

[0072] The 360° rotatable stand 5 is provided with a sample to be tested, and is used to provide a multi-angle working condition test with a 360° rotation around an axis. Figures 2-3 As shown, 51-base (can be metal, wood, plastic, etc.); 52-optical axis bracket fixing seat (large, 2); 53-metal rod (3); 54-support plate (can be metal, wood, plastic, etc.); linear optical axis (thick, 3, including 551 and 552); 56-aluminum plate; 57-optical axis bracket fixing seat (small, 1); 58-transparent insulation cover; 59-axis fixing seat (2); 510-cross axis connecting small fixing block (small, 2); 511-cross axis connecting large fixing block (large, 3); Among them,

[0073] The base 51 is connected to two thick straight optical axes 551 through an axis fixing base 59 to form a bottom support frame; a thick straight optical axis 552 is connected to the two straight optical axes 551 of the support frame through a cross axis connecting the large fixed block 511, and the connection is a movable connection to realize the functions of rotation and up and down movement; the support plate 54 is connected to the straight optical axis 552 of the beam through the optical axis bracket fixing seat 52, and the support plate 54 realizes the up and down and rotation movement of the sample through the up and down movement and rotation of the beam; the optical axis bracket fixing seat 57 is connected to the aluminum plate 56 to form a high-speed camera bracket to achieve support and heat dissipation; the three metal rods 53 are cross-connected through the cross connection fixing block 510 and form a movable bracket of the high-speed camera 6 together with the optical axis bracket fixing seat 57 and the aluminum plate 56, which can realize the rotation and left and right up and down movement of the high-speed camera 6, and the large fixed block 511 is connected to one end of the straight optical axis 551 of the beam through the cross axis to realize the synchronous rotation of the high-speed camera 6 and the support plate 54.

[0074] Furthermore, examples of the above components are shown in Table 1.

[0075] Table 1 Equipment models and parameters

[0076]

[0077] Figure 4 The physical connection diagram of the system of the present invention is shown.

[0078] Another embodiment of the present invention provides a heat pipe multi-angle visualized temperature synchronous acquisition test method, the method is implemented based on the heat pipe multi-angle visualized temperature synchronous acquisition system described above, the method includes:

[0079] S1, placing the sample to be tested on a 360° rotatable stand 5, the heater 8 is installed at the hot end of the sample to be tested, and the cooling water block 9 is installed at the cold end of the sample to be tested;

[0080] S2, using the computer 7 to set different cooling water temperatures, input power of the power module 1, and shooting parameters of the high-speed camera 6, and adjusting the inclination angle of the 360° rotatable stand 5;

[0081] S3, collecting multiple sets of temperature data corresponding to different cooling water temperatures, different input powers of the power module 1, and different inclination angles, wherein the temperature data includes the inlet and outlet temperatures of the cooling water block 9 and the surface temperature of the sample to be tested;

[0082] S4, based on the multiple sets of temperature data, using computer 7 to process the data and perform experimental analysis to obtain the performance and temperature variation law of the heat pipe;

[0083] S5. Collect multiple sets of image data corresponding to different cooling water temperatures, different input powers of the power module 1, and different inclination angles, and perform image processing and experimental analysis using a computer 7 based on the multiple sets of image data to compare and obtain the required changes in the working fluid flow.

[0084] According to an embodiment of the present invention, the test system logic is as follows: Figure 5 As shown in the figure, by setting the experimental conditions, the experimental parameters are imported into the computer. The computer adjusts the output power and water bath temperature according to the real-time power and temperature information returned by the DC power supply and the constant temperature water bath, so that the output parameters of the equipment are constant at the set values ​​to ensure the reliability of the experiment. The experimental data returned by the data acquisition module and the high-speed camera are synchronized by the internal algorithm of the software to align the data time points for subsequent synchronous analysis. Subsequently, the raw data is processed and saved by calling the data processing function, and the experimental results are displayed in real time.

[0085] Specifically, prepare a test sample (which can be a capillary heat pipe, a pulsating heat pipe, a temperature plate, etc.), and use thermocouple glue to glue a certain number of thermocouples at the corresponding hot end, insulation section and cold end of the test sample; install a heater 8 at the hot end of the test sample, and install a cooling water block 9 at the cold end; wherein, the heater 8 and the cooling water block 9 are bonded and fixed to the hot end and cold end surfaces of the test sample, and the bonded parts are filled with thermal conductive silicone pads or thermal conductive silicone grease, and the test sample is fixed on a 360° rotatable stand 5. After the test sample is assembled, the positive and negative electrodes of the hot end heater 8 are respectively connected to the positive and negative wires of the DC power module 1, and the cold end cooling water block 9 is connected to the cooling water bath equipment 2 to form a circulating cooling water circuit.

[0086] The computer 7 is used to set the cooling water temperature (cooling water bath temperature), the DC power input power, the high-speed camera shooting parameters (resolution, frame rate, etc.), and adjust the inclination angle of the 360° rotatable stand 5; for example, it is set to a gradient design, the water bath temperature: 10-60°C, the gradient interval is 5°C, or only one temperature can be set; the DC power input power can be 10-300W, with any gradient interval, which can be increased or decreased; the inclination angle adjustment range is generally 0-90, and the inclination angle is 90° when the heat transfer direction of the test sample is perpendicular to the horizontal plane.

[0087] Start the test. The test process is as follows: Figure 6 As shown, under the set gradient cooling water temperature and inclination, the data of the temperature sensor 3 at each heating power gradient is recorded, the temperature data is collected by the data acquisition module 4 and saved into the computer 7 through the software, and the image data is collected by the high-speed camera 6 and saved into the computer 7.

[0088] After the acquisition is completed, the temperature data is processed and analyzed as follows:

[0089] a) Heat leakage calculation: Calculate according to the inlet and outlet temperature difference of cooling water block 9, the calculation formula is:

[0090] q loss =Q-cm(T2-T1)

[0091] Among them, Q is the output power of the DC power supply, that is, the input power of the heater 8; c is the specific heat of the cooling water, m is the cooling water flow rate; T2 represents the outlet temperature of the cooling water block 9, and T1 represents the inlet temperature of the cooling water block 9.

[0092] Leakage heat is used to measure the credibility of the experimental system. The smaller the leakage heat, the higher the credibility of the experimental data. Figure 7 It can be seen that the heat leakage is different under different heating powers, which is mainly related to the flow operation state of the working fluid in the heat pipe.

[0093] b) Sample performance - thermal resistance calculation:

[0094]

[0095] Among them, ΔT is the difference between the average temperature of the hot end and the cold end of the test sample under a certain working condition, that is, the surface temperature of the test sample.

[0096] Thermal resistance indicates the degree of resistance in the heat transfer process, similar to the resistance of resistance to current. The smaller the thermal resistance, the stronger the thermal conductivity of the test sample. Figure 8 It can be seen that the thermal resistance of all test samples decreases with the increase of heating power, that is, the performance is better at high power; and at high water bath temperature, the performance of all samples is improved, which is manifested by reduced thermal resistance; Sample 1 has the lowest thermal resistance under most working conditions and the best heat transfer performance.

[0097] c) Sample performance-thermal conductivity calculation:

[0098] k=[cm(T2-T1)L] / (AΔT)

[0099] Wherein, L is the heat transfer length of the sample, and A is the heat transfer cross-sectional area of ​​the sample (the size of L and A is determined by the sample parameters).

[0100] Thermal conductivity is a parameter that measures the thermal conductivity of a sample, and includes the geometric parameters of the sample. The larger the thermal conductivity, the better the performance. Fig. 9 It can be seen that after the water bath temperature is increased, the thermal conductivity of the sample is significantly improved, the heat transfer performance is greatly enhanced, and the maximum value can exceed 20000W / m*k.

[0101] After the acquisition is completed, the image data is processed and analyzed as follows:

[0102] Import the collected images into the corresponding existing software to count the movement speed of the liquid plug; compare the flow changes of the working fluid that need to be observed, such as flow pattern changes, special flow processes and temperature changes.

[0103] Depend on Fig.10 It can be seen that the conclusion of flow pattern capture is: due to the expansion of bubbles and the mutual influence between the working fluids in each channel, the bubbles are squeezed between the channels to form a flow pattern transition. Fig.11 It can be seen that the conclusion of flow velocity statistics is: the driving force generated by bubble expansion under high power is enhanced, which increases the flow velocity of the liquid plug, and different working conditions are also the reasons that affect the change of the flow velocity of the liquid plug, among which working conditions 1-5 are the cases of different filling rates of the samples. The smaller the filling rate, the faster the speed.

[0104] The present invention can realize temperature signal analysis and acquisition (single temperature signal acquisition); fluid flow visualization observation analysis and acquisition (single flow analysis); temperature and fluid flow synchronous analysis and acquisition; signal acquisition and analysis under any thermal working conditions, including constant / variable heating power, constant / variable cooling temperature, and constant / variable cooling water flow.

[0105] It should be noted that, although several units, modules or submodules are mentioned in the above detailed description, this division is merely exemplary and not mandatory. In fact, according to an embodiment of the present invention, the features and functions of two or more modules described above can be embodied in one module. Conversely, the features and functions of one module described above can be further divided into being embodied by multiple modules.

[0106] In addition, although the operations of the method of the present invention are described in a specific order in the drawings, this does not require or imply that the operations must be performed in this specific order, or that all the operations shown must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps.

[0107] Although the spirit and principle of the present invention have been described with reference to several specific embodiments, it should be understood that the present invention is not limited to the disclosed specific embodiments, and the division of various aspects does not mean that the features in these aspects cannot be combined to benefit, and such division is only for the convenience of expression. The present invention is intended to cover various modifications and equivalent arrangements included in the spirit and scope of the attached claims.

Claims

1. A heat pipe multi-angle visual temperature synchronous acquisition system, characterized in that: include: A power module (1), a cooling water bath device (2), a temperature sensor (3), a data acquisition module (4), a 360° rotatable stand (5), a high-speed camera (6), a computer (7), a heater (8), and a cooling water block (9); wherein: The power module (1) is connected to the computer (7) and the heater (8) respectively, and is used to provide electric energy to the heater (8); The cooling water bath device (2) is connected to the cooling water block (9) and is used to cool the circulating cooling water and control the temperature; The temperature sensor (3) is connected to the data acquisition module (4) and the cooling water block (9) respectively, and is used to collect the temperature of the sample to be tested and the inlet and outlet temperatures of the cooling water, and convert the temperature signal into an electrical signal and output it to the data acquisition module (4); The data acquisition module (4) is connected to the computer (7) and the temperature sensor (3) respectively, and is used to convert the received electrical signal into a digital signal and output it to the computer (7); A sample to be tested is placed on the 360° rotatable stand (5), which is used to provide a multi-angle working condition test in which the sample to be tested rotates 360° around an axis; The high-speed camera (6) is fixedly placed on a bracket on a 360° rotatable stand (5), and is connected to a computer (7) for providing image acquisition and real-time observation; The computer (7) is used for receiving the temperature data and the image data, and processing and analyzing the temperature data and the image data; The heater (8) and the cooling water block (9) are both connected to the sample to be tested. The heater (8) is used to provide a heat source for the sample to be tested; and the cooling water block (9) is used to provide a cold source for the sample to be tested.

2. According to claim 1, a heat pipe multi-angle visual temperature synchronous acquisition system is characterized in that: The temperature sensor (3) comprises a first temperature sensor and a second temperature sensor, wherein the first temperature sensor is connected to the cooling water block (9) and is used to collect the inlet and outlet temperatures of the cooling water block (9); and the second temperature sensor is connected to the surface of the sample to be tested and is used to collect the surface temperature of the sample to be tested.

3. The heat pipe multi-angle visual temperature synchronous acquisition system according to claim 1 is characterized in that: The 360° rotatable platform (5) comprises a base (51), two optical axis support fixing seats (52), three metal rods (53), a support plate (54), three linear optical axes, an aluminum plate (56), an optical axis support fixing seat (57), two axis fixing seats (59), two cross-axis connected small fixing blocks (510), and three cross-axis connected large fixing blocks (511); wherein the three linear optical axes comprise a horizontal beam linear optical axis (551) and two vertical linear optical axes (552); The base (51) is connected to two vertical linear optical axes (552) through two shaft fixing seats (59) to form a bottom support frame; a cross beam linear optical axis (551) is movably connected to the two vertical linear optical axes (552) on the bottom support frame through two cross shafts to connect the large fixing block (511) to achieve rotation and up and down movement; the support plate (54) is connected to the cross beam linear optical axis (551) through two optical axis bracket fixing seats (52) to achieve up and down and rotational movement of the sample to be tested; the optical axis bracket fixing seat (52) is connected to the cross beam linear optical axis (551 ... The fixed seat (57) is connected to the aluminum plate (56) to form a bracket supporting the high-speed camera (6); three metal rods (53) are cross-connected to the small fixed block (510) through a cross axis and form a high-speed camera moving bracket together with the aluminum plate (56) and the optical axis bracket fixed seat (57) to realize the rotation and left and right up and down movement of the high-speed camera (6); and the large fixed block (511) is connected to the beam linear optical axis (551) through a cross axis to realize the synchronous rotation of the high-speed camera (6) and the support plate (54).

4. The heat pipe multi-angle visual temperature synchronous acquisition system according to claim 3 is characterized in that: The 360° rotatable stand (5) further comprises a transparent heat-insulating cover (58), which is used to surround and protect the sample to be tested, and plays the role of heat insulation and visualization.

5. The heat pipe multi-angle visual temperature synchronous acquisition system according to claim 1, characterized in that: The system also includes an LED fill light, which is used to increase the amount of light entering the camera during the shooting process of the high-speed camera (6).

6. The heat pipe multi-angle visual temperature synchronous acquisition system according to claim 1, characterized in that: The power module (1) is a direct current power supply or an alternating current power supply; the cooling water bath equipment (2) comprises a water chiller or an air cooler; and the heater (8) comprises a ceramic heating plate or a heating wire.

7. The heat pipe multi-angle visual temperature synchronous acquisition system according to claim 1, characterized in that: The sample to be tested includes a capillary heat pipe, a pulsating heat pipe or a temperature homogenizing plate.

8. A heat pipe multi-angle visual temperature synchronous acquisition test method, characterized in that: The method is implemented based on a heat pipe multi-angle visual temperature synchronous acquisition system according to any one of claims 1 to 7, and the method comprises: The sample to be tested is placed on a 360° rotatable stand (5), the heater (8) is installed at the hot end of the sample to be tested, and the cooling water block (9) is installed at the cold end of the sample to be tested; Using a computer (7) to set different cooling water temperatures, input power of a power module (1), and shooting parameters of a high-speed camera (6), and to adjust the inclination angle of a 360° rotatable platform (5); Corresponding to different cooling water temperatures, different input powers of the power modules (1), and different inclination angles, a plurality of sets of temperature data are collected, wherein the temperature data include the inlet and outlet temperatures of the cooling water block (9) and the surface temperature of the sample to be tested; Based on the multiple sets of temperature data, a computer (7) is used to process the data and conduct experimental analysis to obtain the performance of the heat pipe and the temperature variation law; Multiple sets of image data are collected corresponding to different cooling water temperatures, different input powers of power modules (1), and different inclination angles, and based on the multiple sets of image data, a computer (7) is used to perform image processing and experimental analysis to compare and obtain the required changes in the flow of the working fluid to be observed.

9. A heat pipe multi-angle visualized temperature synchronous acquisition test method according to claim 8, characterized in that: The data processing performed by a computer (7) based on multiple sets of temperature data includes heat leakage calculation, thermal resistance calculation, and thermal conductivity calculation; wherein the formula for heat leakage calculation is: q loss =Q-cm(T2-T1) In the formula, Q represents the output power of the power supply; c represents the specific heat of cooling water, m represents the flow rate of cooling water; T2 represents the outlet temperature of the cooling water block, and T1 represents the inlet temperature of the cooling water block; The formula for calculating the thermal resistance is: In the formula, ΔT represents the difference between the average temperature of the hot end and the cold end of the sample to be tested; The formula for calculating the thermal conductivity is: k=[cm(T2-T1)L] / (AΔT) Where L is the heat transfer length of the sample to be tested; A represents the heat transfer cross-sectional area of ​​the sample to be tested.

10. A heat pipe multi-angle visualized temperature synchronous acquisition test method according to claim 8, characterized in that: The tilt angle adjustment range of the 360° rotatable stand (5) is 0-90°, wherein the tilt angle is 90° when the heat transfer direction of the sample to be tested is perpendicular to the horizontal plane.

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