Device and method for detecting hydraulic characteristics of wick based on multi-modal perception

Abstract

The invention relates to a device and a method for detecting hydraulic characteristics of a wick based on multi-modal perception. The detection device comprises a contour image acquisition device, a surface color temperature acquisition device and a mass transfer quality detection device, the contour image acquisition device acquires a wick contour image and extracts wick contour data from the wick contour image; the surface color temperature acquisition device acquires surface color temperature data of the wick by taking the wick contour data as a detection range; the mass detection device detects the mass of the working medium sucked from the working medium container by the wick in real time; and the upper computer extracts a wetted area and a non-wetted area of the wick according to the surface color temperature data of the wick, calculates the real-time climbing height and the climbing speed of the working medium in the wick according to the wetted area, and calculates the mass transfer amount and the mass transfer rate of the wick at the corresponding working medium climbing height. And comprehensive analysis is carried out through multiple test data sources, so that a more accurate evaluation result of the hydraulic characteristics of the wick is obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pipe wick hydraulic performance detection technology, and in particular to a wick hydraulic property detection device and method based on multi-modal sensing. Background Art

[0002] As a porous medium, the wick can transfer liquid working fluid well inside through its capillary action and has a wide range of applications in the field of heat pipes.

[0003] The hydraulic properties of the wick determine the overall performance of the heat pipe. Currently, researchers often test the hydraulic properties of the wick through capillary rise experiments of the working fluid.

[0004] The conventional testing method is usually to immerse the lower end of the liquid wick in the working fluid of the working fluid container, and to provide a qualitative analysis result by observing the climbing height of the working fluid in the liquid wick within a certain period of time.

[0005] It has the following technical problems: Only climbing height is used as the test data source, which is too single and difficult to conduct a comprehensive evaluation; the qualitative analysis and evaluation of the hydraulic characteristics of the wick is based solely on the subjective feelings of the testers, resulting in inaccurate qualitative analysis results. Summary of the invention

[0006] In view of the problems existing in the prior art, the purpose of the present invention is to provide a device and method for detecting the hydraulic characteristics of a liquid-absorbing core based on multimodal sensing, which can provide multiple test data sources and perform comprehensive evaluation to obtain more accurate analysis results of the hydraulic characteristics of the liquid-absorbing core.

[0007] In order to achieve the above object, the present invention adopts the following technical solution: A device for detecting hydraulic characteristics of a liquid-absorbing core based on multimodal sensing, wherein the lower end of the liquid-absorbing core is immersed in a working medium in a working medium container, and the detection device comprises a frame and a host computer, and a contour image acquisition device, a surface color temperature acquisition device and a mass transfer detection device are arranged on the frame; The contour image acquisition device is used to acquire the contour image of the liquid wick, and extract the contour data of the liquid wick from the contour image of the liquid wick and send it to the surface color temperature acquisition device; The surface color temperature acquisition device is used to collect the surface color temperature data of the wick using the received wick outline data as the detection range, and send it to the host computer; The mass detection device is used to detect in real time the mass of the working fluid sucked by the liquid wick from the working fluid container; The host computer is used to extract the wetted area and unwetted area of ​​the absorbent core according to the color temperature data of the surface of the absorbent core, calculate the real-time climbing height and climbing speed of the working fluid in the absorbent core through the wetted area, and calculate the mass transfer and mass transfer rate of the absorbent core at the corresponding working fluid climbing height according to the real-time climbing height, climbing speed and mass of the pumped working fluid.

[0008] Furthermore, an X-axis dovetail groove slide module is provided on the frame, a Z-axis dovetail groove slide module is provided above the X-axis dovetail groove slide module, the contour image acquisition device and the surface color temperature acquisition device are an infrared thermal imager and an industrial area array camera respectively, and the infrared thermal imager and the industrial area array camera are both fixed on the Z-axis dovetail groove slide module and correspond to the liquid absorption core.

[0009] Furthermore, the infrared thermal imager and the industrial area array camera are arranged correspondingly up and down.

[0010] Furthermore, the mass transfer detection device includes an electronic balance, the working fluid container is placed on the electronic balance, and the frame is provided with a motor slide module, which is used to drive the electronic balance to move up and down.

[0011] Furthermore, the rack is provided with a sample fixing plate, the sample fixing plate is provided with a groove for clamping the liquid-absorbing core, and the infrared thermal imager and the industrial area array camera are respectively arranged corresponding to the grooves.

[0012] Furthermore, the frame is provided with a motor push rod, which is used to hold the liquid-absorbing core against the sample fixing plate so that the liquid-absorbing core remains in a vertical state.

[0013] Furthermore, the frame is provided with a background plate, which is arranged on one side of the sample fixing plate and is used to provide a high-contrast background for collecting the liquid-absorbing core contour image.

[0014] A method for detecting hydraulic characteristics of a liquid absorbent core based on multimodal sensing, using the above-mentioned device for detecting hydraulic characteristics of a liquid absorbent core based on multimodal sensing, comprises the following steps: The contour image acquisition device acquires the contour image of the liquid wick, and extracts the contour data of the liquid wick from the contour image of the liquid wick and sends it to the surface color temperature acquisition device; The surface color temperature acquisition device uses the received wick contour data as the detection range to collect the wick surface color temperature data and sends it to the host computer; The mass detection device detects the mass of the working fluid sucked from the working fluid container by the liquid absorption core in real time and sends it to the host computer; The host computer extracts the wetted area and unwetted area of ​​the absorbent core according to the color temperature data of the surface of the absorbent core, calculates the real-time climbing height and climbing speed of the working fluid in the absorbent core through the wetted area, and calculates the mass transfer and mass transfer rate of the absorbent core at the corresponding working fluid climbing height according to the mass of the working fluid sucked by the absorbent core in real time.

[0015] Furthermore, the hydraulic characteristic parameters of the wick include the capillary pressure ΔP cap and permeability K, through the fluid climbing rate and the mass transfer rate of the working fluid Solve: (1) By transforming equation (1), we can get: (2) In the formula, is the working fluid density, is the climbing height of the working fluid, is the dynamic viscosity of the working fluid, is the capillary climbing speed of the working fluid in the wick; the working fluid climbing rate The inverse of the working fluid climbing height The linear relationship is formed, and the permeability K and capillary pressure of the absorbent core to be tested are solved by the linear fitting algorithm. .

[0016] Furthermore, the hydraulic characteristic parameters of the wick include the porosity φ, and the solution process is as follows: Working fluid mass transfer rate With the working fluid climbing rate There are the following corresponding relationships: (3) In the formula, is the mass transfer rate of the working fluid, is the cross-sectional area of ​​the absorbent core; the real-time porosity of the absorbent core is obtained by transforming equation (3) , as shown below: (4) Real-time porosity of wick Represents the working fluid climbing rate at the current working fluid The porosity of the height h segment when the downward climb corresponds to the height h.

[0017] In general, the present invention has the following advantages: By using multiple types of sensors to detect different modal data, multiple test data sources are obtained, and the host computer is used to conduct a comprehensive analysis of the multiple test data sources to obtain more accurate evaluation results of the hydraulic characteristics of the wick. At the same time, automated testing equipment is designed to automate the capillary rise experiment of the wick working fluid and accurately collect the data on the capillary rise of the working fluid in the wick. The experimental data collection process is standardized to enable relevant practitioners to quickly and accurately obtain the hydraulic characteristics of the wick samples. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1A schematic structural diagram of a device for detecting hydraulic characteristics of a liquid-wick based on multimodal sensing provided in an embodiment of the present invention.

[0019] Figure 2 This is an oblique view of a slide moving module provided in an embodiment of the present invention.

[0020] Figure 3 A schematic diagram of the structure of an experiment control module provided in an embodiment of the present invention.

[0021] Figure 4 This is a perspective view of an electric control module provided in an embodiment of the present invention.

[0022] In the figure: 1-1 is the frame, 1-2 is the detection box, and 1-3 is the foot pad; 2-1 is an industrial array camera, 2-2 is an infrared thermal imager, and 2-3 is an electronic balance; 3-1 is the X-axis dovetail slot slide module, 3-2 is the Z-axis dovetail slot slide module, and 3-3 is the camera fixing bracket; 4-1 is a gantry, 4-2 is a background plate, 4-3 is a motor slide module, 4-4 is a motor slide module fixed back plate, 4-5 is a motor slide module fixed bottom plate, 4-6 is a gantry fixed block, 4-7 is a slide bracket, 4-8 is an electronic balance fixed frame, 4-9 is a linear motor fixed frame, 4-10 is a linear push rod motor, 4-11 is a spring top block, 4-12 is a sample fixing plate, 4-13 is a liquid core sample, and 4-14 is a working fluid container; 5-1 is the electric control box, 5-2 is the push rod motor control button, 5-3 is the main switch, and 5-4 is the Ethernet interface. DETAILED DESCRIPTION

[0023] The present invention will be described in further detail below.

[0024] See also Figure 1 A device for detecting hydraulic characteristics of a liquid-absorbing core based on multimodal sensing includes a frame 1-1, a data acquisition module, a slide moving module, an experimental control module, an electronic control module and a host computer, etc. Each module is fastened to the frame 1-1 by bolt connection.

[0025] A detection box 1-2 is provided on the frame 1-1. An observation window is opened on the surface of the detection box 1-2 and a sheet metal door is installed. The detection box 1-2 completely covers the data acquisition module, the slide movement module and the experimental control module to isolate the internal and external environments of the device.

[0026] The data acquisition module includes a contour image acquisition device, a surface color temperature acquisition device and a transmission quality detection device, which in this embodiment are an industrial area array camera 2-1, an infrared thermal imager 2-2 and an electronic balance 2-3 respectively.

[0027] There are eight foot pads 1-3, which are symmetrically distributed at the bottom of the rack 1-1 and are used to support the entire experimental device.

[0028] See also Figure 2 The slide moving module includes an X-axis dovetail groove slide module 3-1 and a Z-axis dovetail groove slide module 3-2, which are used to adjust the positions of the industrial array camera 2-1 and the infrared thermal imager 2-2 in the detection device.

[0029] The industrial area array camera 2-1 and the infrared thermal imager 2-2 are installed on the upper and lower sides of the camera fixing frame 3-3 by bolts to ensure that the vertical center lines of the lenses of the two coincide with each other; the camera fixing frame 3-3 is installed on the Z-axis dovetail groove slide module 3-2, and the Z-axis dovetail groove slide module 3-2 is horizontally installed on the X-axis dovetail groove slide module 3-1. The spatial positions of the industrial area array camera 2-1 and the infrared thermal imager 2-2 in the X and Z directions are adjusted by the X-axis dovetail groove slide module 3-1 and the Z-axis dovetail groove slide module 3-2 to ensure that a complete and large-area liquid-wicking core sample 4-13 detection image is obtained.

[0030] See also Figure 3 The experimental control module includes a gantry 4-1, a linear push rod motor 4-10 and a motor slide module 4-3, etc., which are used to fix the wick sample 4-13 to be tested and realize the automated process of the capillary climbing experiment of the wick working fluid.

[0031] The gantry fixing block 4-5 is installed on the frame 1-1, and the gantry 4-1 is installed on the gantry fixing block 4-5. The gantry 4-1 is used to carry the linear push rod motor 4-10, the sample fixing plate 4-12, the background plate 4-2 and the motor slide module 4-3, and provide the required height difference for measuring the liquid core sample 4-13. The linear push rod motor 4-10 is fixed on the linear motor fixing frame 4-9. Threaded holes are opened at both ends of the linear motor fixing frame 4-9, which is connected to the front end of the gantry 4-1 by bolts. A spring top block 4-11 is installed at the front end of the motor push rod to increase the contact area between the push rod and the liquid wick sample 4-13. The liquid wick sample 4-13 is supported on the sample fixing plate 4-12 through the joint action of the push rod and the spring top block 4-11. The surface of the sample fixing plate 4-12 is provided with grooves, and bolt holes are opened on the left and right sides to connect with the upper part of the gantry 4-1. The liquid wick sample 4-13 is clamped by the surface groove to ensure that the liquid wick sample 4-13 is located at the center line of the lens.

[0032] In a similar manner, the motor slide module 4-3 is fixed behind the gantry 4-1 through the motor slide module fixed back plate 4-4 and the motor slide module fixed bottom plate 4-5, and the vertical center line of the motor slide module 4-3 coincides with the vertical center line of the sample fixing plate 4-12 to ensure installation symmetry.

[0033] The background plate 4-2 is used to provide a high-contrast background for acquiring the detection image of the liquid core sample 4-13. The background plate 4-2 is installed in the middle of the gantry 4-1. The background plate 4-2 has symmetrical grooves on both sides for connecting the motor slide module 4-3 and the electronic balance 2-3 through the slide bracket 4-7.

[0034] The slide brackets 4-7 are symmetrically distributed at both ends of the sample detection center line, the electronic balance fixing frame 4-8 is connected to the two slide brackets 4-7 by bolts, the electronic balance 2-3 is placed above the electronic balance fixing frame 4-8, and the working fluid container 4-14 is placed horizontally above the electronic balance 2-3 after receiving the working fluid to be tested.

[0035] See also Figure 4 In the electric control module, the main switch 5-3, the push rod motor control button 5-2 and the Ethernet interface 5-4 are all installed on the surface of the electric control box 5-1.

[0036] The main switch 5-3 is used to control the on and off of the power supply of the entire detection device; the push rod motor control button 5-2 is used to control the working state of the linear push rod motor 4-10; the Ethernet interface 5-4 is connected to the switch inside the electric control box and to the host computer outside to realize data transmission between the detection device and the host computer; the switch, motor driver and motor controller are installed in the electric control box, one end of the switch is connected to the industrial array camera 2-1, infrared thermal imager 2-2, electronic balance 2-3 and motor controller, and the other end is connected to the Ethernet interface 5-4 on the electric control box, and information is exchanged with the host computer in the form of network port communication, and the climbing data of the liquid-absorbing core working fluid is detected and analyzed through the relevant detection algorithm of the host computer, and the detection device is controlled.

[0037] The present invention adopts multiple types of sensors to detect different modal data, and solves the problem that a single detection device cannot effectively collect hydraulic characteristic data of a wick sample 4-13 through a joint acquisition scheme of an industrial array camera 2-1, an infrared thermal imager 2-2 and an electronic balance 2-3; the present invention collects contour images of the wick sample 4-13 through an industrial array camera 2-1, extracts size contour data of the wick sample 4-13, and separates the wick sample 4-13 and the test background through the contour data, thereby providing a detection range for the infrared thermal imager 2-2, removing interference background in the detection image of the infrared thermal imager 2-2, and improving work efficiency and analysis accuracy; then, the infrared thermal imager 2-3 is used to collect the contour image of the wick sample 4-13, extracts the ... extracts the size contour data of the wick sample 4-13, extracts the size contour data of the wick sample 4-13, extracts the size contour data of the wick sample 4-13, extracts the size contour data of the wick sample 4-13, extracts the size contour data of the wick sample 4-13, extracts the size contour data of the wick sample 4-13, extracts the size contour data of the wick sample 4-13, and separates the wick sample 4-13 and the test background through the contour data, thereby providing a detection range for the infrared thermal imager 2-2, removing interference background in the detection image of the infrared thermal imager 2-2, and The imager 2-2 senses the surface color temperature data of the absorbent core sample 4-13, and the host computer distinguishes the wetted and non-wetted areas in the absorbent core according to the color temperature difference, extracts the wetted area, and solves the real-time climbing height and climbing speed of the working fluid in the absorbent core sample 4-13 through relevant algorithms. At the same time, the electronic balance 2-3 senses the mass of the working fluid sucked by the absorbent core sample 4-13 in real time, and solves the mass transfer mass and mass transfer rate of the absorbent core sample 4-13 at different heights when the working fluid climbs to the absorbent core sample 4-13 according to the relevant algorithms of the host computer, so as to solve the problem that the climbing height of the working fluid and the mass transfer mass cannot be accurately corresponded due to the uneven distribution of pores in the absorbent core; finally, the mass transfer rate of the working fluid is used and climb rate Solve the evaluation parameters of the hydraulic properties of the wick sample 4-13, specifically the capillary pressure , porosity and permeability K.

[0038] The detection method of the capillary rise experiment of the liquid wick samples 4-13 by the detection device of the present invention is as follows: The electric control module is connected to the host computer via the Ethernet interface 5-4, and the motor slide module 4-3 and the linear push rod motor 4-10 are controlled by the host computer to be in the initial position; The working fluid container 4-14 is filled with the working fluid to be tested, and the working fluid container 4-14 is horizontally fixed on the electronic balance fixing frame 4-8; Place the wick sample 4-13 into the fixing groove of the sample fixing plate 4-12, and control the linear push rod motor 4-10 through the push rod motor control button 5-2 on the electric control box to drive the spring top block 4-11 to hold the wick sample 4-13, ensuring that the wick sample 4-13 is perpendicular to the working fluid container 4-14; The upper computer sends a command to the motor slide module 4-3, and the motor slide module 4-3 drives the working medium container 4-14 to move upward, and the working medium contacts the liquid wick sample 4-13, and the liquid wick sample 4-13 starts to absorb the working medium, and the working medium capillary climbing experiment starts; The host computer controls the industrial array camera 2-1 and the infrared thermal imager 2-2 to start collecting image data. When the working fluid climbs to the specified height of the liquid wick sample 4-13 or the experiment is performed for a specified time, the host computer sends a command to the motor slide module 4-3, and the motor slide module 4-3 drives the working fluid container 4-14 to move downward, and the working fluid is separated from the liquid wick sample 4-13, and the working fluid capillary climbing experiment ends; The host computer analyzes and processes the collected image data and mass data. The capillary pressure is selected as the evaluation parameter of the hydraulic characteristics of the liquid wick in the present invention. , porosity and permeability K, and establish the parameter relationship through the Laplace equation and the pressure drop loss balance equation, as shown in formula (1): (1) By transforming equation 1, we can get: (2) In formula (2), is the working fluid density, is the climbing height of the working fluid, is the dynamic viscosity of the working fluid, is the capillary climbing speed of the working fluid in the wick sample 4-13; the working fluid climbing rate The inverse of the working fluid climbing height The linear relationship can be solved by linear fitting algorithm to solve the permeability K and capillary pressure of the absorbent core to be tested. .

[0039] Further analysis shows that the mass transfer rate of the working fluid With the working fluid climbing rate There is a corresponding relationship in formula (3): (3) In formula 3, is the mass transfer rate of the working fluid, is the cross-sectional area of ​​the absorbent core sample 4-13; the real-time porosity of the absorbent core is obtained by deforming equation 3 , as shown in formula (4): (4) Here we define the real-time porosity of the wick Represents the working fluid climbing rate at the current working fluid The porosity of the height h segment when the downward climb corresponds to the height h.

[0040] The present invention collects multi-modal data through multi-type sensors, and calculates the inverse of the working medium climbing height on the host computer. , working fluid climbing rate and the mass transfer rate of the working fluid , through the unified timestamp to ensure the consistency of the solution data time; at the same time, based on the existing formula, the working fluid climbing rate is introduced Mass transfer rate Calculate the hydraulic characteristics and effectively obtain the real-time porosity of the wick sample 4-13 Compared with the traditional measurement method, which can only solve the overall porosity of the wick A significant improvement.

[0041] After the host computer completes the data solution, it gives a test report and the hydraulic properties test of the wick sample 4-13 is completed.

[0042] In view of the problem that there is currently a lack of an efficient and accurate detection device for the hydraulic characteristics of the heat pipe wick, this embodiment has developed a device for jointly detecting the capillary climbing experiment of the wick working fluid based on an infrared thermal imager 2-2, an industrial area array camera 2-1 and an electronic balance 2-3. Different modal data are detected by multiple types of sensors, and the data are analyzed using a host computer to comprehensively evaluate the hydraulic characteristics of the wick. At the same time, automated detection equipment is designed to realize the automated implementation of the capillary climbing experiment of the wick working fluid, accurately collect the data on the capillary climbing of the working fluid in the wick, standardize the experimental data collection process, and enable relevant practitioners to quickly and accurately obtain the hydraulic characteristics of the wick sample 4-13.

[0043] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A device for detecting hydraulic characteristics of a liquid absorbent core based on multimodal sensing, wherein the lower end of the liquid absorbent core is immersed in a working fluid in a working fluid container, characterized in that: It includes a frame and a host computer, and the frame is provided with a profile image acquisition device, a surface color temperature acquisition device and a transmission quality detection device; The contour image acquisition device is used to acquire the contour image of the liquid wick, and extract the contour data of the liquid wick from the contour image of the liquid wick and send it to the surface color temperature acquisition device; The surface color temperature acquisition device is used to collect the surface color temperature data of the wick using the received wick outline data as the detection range, and send it to the host computer; The mass detection device is used to detect in real time the mass of the working fluid sucked by the liquid wick from the working fluid container; The host computer is used to extract the wetted area and unwetted area of ​​the absorbent core according to the color temperature data of the surface of the absorbent core, calculate the real-time climbing height and climbing speed of the working fluid in the absorbent core through the wetted area, and calculate the mass transfer mass and mass transfer rate of the absorbent core at the corresponding working fluid climbing height according to the mass of the working fluid sucked by the absorbent core in real time.

2. According to claim 1, a device for detecting hydraulic properties of a liquid-absorbing core based on multimodal sensing is characterized in that: An X-axis dovetail groove slide module is provided on the frame, and a Z-axis dovetail groove slide module is provided above the X-axis dovetail groove slide module. The contour image acquisition device and the surface color temperature acquisition device are an infrared thermal imager and an industrial area array camera respectively. The infrared thermal imager and the industrial area array camera are both fixed on the Z-axis dovetail groove slide module and correspond to the liquid absorption core.

3. The device for detecting hydraulic properties of a liquid-absorbing core based on multimodal sensing according to claim 2, characterized in that: The infrared thermal imager and the industrial area array camera are arranged correspondingly up and down.

4. The device for detecting hydraulic properties of a liquid-absorbing core based on multimodal sensing according to claim 1, characterized in that: The mass transfer detection device comprises an electronic balance, a working fluid container is placed on the electronic balance, and a frame is provided with a motor slide module, which is used for driving the electronic balance to move up and down.

5. The device for detecting hydraulic properties of a liquid-absorbing core based on multimodal sensing according to claim 2, characterized in that: The rack is provided with a sample fixing plate, the sample fixing plate is provided with grooves for clamping the liquid-absorbing core, and the infrared thermal imager and the industrial area array camera are respectively arranged corresponding to the grooves.

6. The device for detecting hydraulic properties of a liquid-absorbing core based on multimodal sensing according to claim 5, characterized in that: The frame is provided with a motor push rod, which is used to hold the liquid-absorbing core against the sample fixing plate so that the liquid-absorbing core can be kept in a vertical state.

7. The device for detecting hydraulic properties of a liquid-absorbing core based on multimodal sensing according to claim 5, characterized in that: The rack is provided with a background plate, which is arranged on one side of the sample fixing plate and is used to provide a high-contrast background for collecting the liquid-absorbing core contour image.

8. A method for detecting hydraulic properties of a liquid-absorbing core based on multimodal sensing, characterized in that: A device for detecting hydraulic characteristics of a liquid-absorbing core based on multimodal sensing as described in any one of claims 1 to 7 comprises the following steps: The contour image acquisition device acquires the contour image of the liquid wick, and extracts the contour data of the liquid wick from the contour image of the liquid wick and sends it to the surface color temperature acquisition device; The surface color temperature acquisition device uses the received wick contour data as the detection range to collect the wick surface color temperature data and sends it to the host computer; The mass detection device detects the mass of the working fluid sucked from the working fluid container by the liquid absorption core in real time and sends it to the host computer; The host computer extracts the wetted area and unwetted area of ​​the absorbent core according to the color temperature data of the surface of the absorbent core, calculates the real-time climbing height and climbing speed of the working fluid in the absorbent core through the wetted area, and calculates the mass transfer and mass transfer rate of the absorbent core at the corresponding working fluid climbing height according to the mass of the working fluid sucked by the absorbent core in real time.

9. The detection method according to claim 8, characterized in that: The hydraulic characteristic parameters of the wick include capillary pressure ΔP cap and permeability K, through the fluid climbing rate and the mass transfer rate of the working fluid Solve: （1） By transforming equation (1), we can get: （2） In the formula, is the working fluid density, is the climbing height of the working fluid, is the dynamic viscosity of the working fluid, is the capillary climbing speed of the working fluid in the wick; the working fluid climbing rate The inverse of the working fluid climbing height The linear relationship is formed, and the permeability K and capillary pressure of the absorbent core to be tested are solved by the linear fitting algorithm. .

10. The detection method according to claim 9, characterized in that: The hydraulic characteristic parameters of the wick include porosity φ, and the solution process is as follows: Working fluid mass transfer rate With the working fluid climbing rate There are the following corresponding relationships: （3） In the formula, is the mass transfer rate of the working fluid, is the cross-sectional area of ​​the wick; The real-time porosity of the absorbent core obtained by transforming equation (3) is , as shown below: （4） Real-time porosity of wick Represents the working fluid climbing rate at the current working fluid The porosity of the height h segment when the downward climb corresponds to the height h.

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