Vapor chamber gas-liquid channel structure design method based on vein fractal rule

Abstract

The invention discloses a vapor chamber gas-liquid channel structure design method based on a vein fractal rule. The vapor chamber gas-liquid channel structure design method mainly comprises the following steps: establishing a vein channel structure mathematical model in which a primary vein and a secondary vein cooperate; establishing a main vein and secondary vein collaborative flow channel structure, and constructing a three-dimensional flow channel model of the vein channel structure; determining the value range of design parameters, setting an initial value, and then solving the temperature, pressure and velocity field distribution of the vein channel structure when the initial value is obtained; optimizing a vein channel structure by taking maximization of a total heat transfer coefficient of a vein structure flow channel and minimization of gas-liquid resistance in a vapor chamber as optimization objectives; and the flow channel layout of the optimized vein channel structure meeting the preset requirement is adjusted according to the use requirement size of the vapor chamber, and therefore the final layout of the vapor chamber gas-liquid channel is obtained. According to the vapor chamber, the vein-imitating gas-liquid channel structure is applied to the design of the vapor chamber, so that the conduction and distribution effects of fluid in the vapor chamber are improved, and the heat transfer performance is optimized.

Description

Technical Field

[0001] The present invention relates to the technical field of the design of gas-liquid channels in a heat pipe, and particularly to a design method for the gas-liquid channel structure of a heat pipe based on the vein fractal rule. Background Art

[0002] The efficiency of heat transfer and mass transfer is crucial for engineering applications such as cooling systems in electronics, power generation, and aerospace. With the rapid development of modern electronic devices, especially in the fields of high-performance computing, communication devices, and electric vehicles, the power density of electronic components has gradually increased, resulting in rapid heat accumulation, which poses higher requirements for heat dissipation technology. If heat cannot be effectively dissipated in a timely manner, it may lead to a decline in device performance, reduced reliability, and even thermal failure. Traditional heat management methods have been difficult to cope with the increasingly high power density and heat flux density, and the heat pipe, as an efficient heat transfer component, has been widely used in the field of electronic heat dissipation due to its excellent thermal conductivity and temperature uniformity effect. The performance of the heat pipe directly affects the temperature of electronic components during operation, and the gas-liquid channel structure inside the heat pipe is the main factor affecting the heat transfer performance of the heat pipe. In order to improve the gas-liquid exchange efficiency inside the heat pipe, reduce the influence of gas-liquid flow resistance on the heat transfer performance of the heat pipe, and further enhance the temperature uniformity performance of the heat pipe, the design layout of the gas-liquid channels in the heat pipe has become the key to the design.

[0003] The traditional design of the gas-liquid channel structure of the heat pipe mainly relies on experience or simply arranges or combines the gas-liquid channels in a vertical / radiating / planning manner. However, with the continuous improvement of heat dissipation requirements, the arrangements of these gas-liquid channels are difficult to meet the current heat transfer requirements. Summary of the Invention

[0004] In order to at least overcome one of the deficiencies of the prior art, the present invention provides a design method for the gas-liquid channel structure of a heat pipe based on the vein fractal rule. The vein system in nature has efficient material transport and distribution capabilities due to its unique channel design, especially showing extremely high distribution efficiency in fluid transport. By learning from this natural system and using the vein fractal rule to extract the vein structure characteristics, the present invention applies the gas-liquid channel structure imitating the vein to the design of the heat pipe to improve the conduction and distribution effect of the fluid inside the heat pipe, thereby optimizing the heat transfer performance. The present invention provides new ideas for the design and manufacture of heat pipes for efficient heat dissipation and lays a foundation for the development of high-performance heat management systems in the future.

[0005] In order to achieve the object of the present invention, a design method for the gas-liquid channel structure of a heat pipe based on the vein fractal rule provided by the present invention includes the following steps:

[0006] Based on the vein fractal rule, establish a mathematical model of the vein channel structure with coordinated main veins and secondary veins;

[0007] Establish a flow channel structure for the cooperation of the main vein and secondary veins based on the mathematical model of the vein channel structure, construct a three-dimensional flow channel model of the vein channel structure, determine the design parameters according to the flow channel structure parameters in the three-dimensional flow channel model, and then simulate the heat dissipation process of the vein channel structure;

[0008] Set the boundary conditions according to the material parameters, heat source, and working conditions;

[0009] According to the three-dimensional flow channel model of the vein channel structure, determine the value range of the design parameters and set the initial values, and then solve to obtain the temperature, pressure, and velocity field distributions of the vein channel structure at the initial values;

[0010] Define the total heat transfer coefficient η as the standard for judging the heat and mass transfer performance of the vein channel structure, and based on the function relationship between the design parameters obtained by the solution and the total heat transfer coefficient η;

[0011] Optimize the vein channel structure with the goal of maximizing the total heat transfer coefficient of the vein structure flow channel and minimizing the gas-liquid resistance in the heat spreader according to the heat and mass transfer characteristics of the vein structure channel and the heat spreader;

[0012] Judge whether the optimized vein channel structure meets the preset requirements;

[0013] Adjust the flow channel layout of the optimized vein channel structure that meets the preset requirements according to the size requirements of the heat spreader for use, so as to obtain the final layout of the gas-liquid channels of the heat spreader.

[0014] Furthermore, the mathematical model of the vein channel structure is as follows:

[0015] Construct an empirical circular wave formula describing the complex symmetry of the dicotyledonous vein system as follows:

[0016]

[0017] Among them, λ is a constant related to the type of vein (λ≥1); d is the diameter of the metaphorical circle; ω represents the size of the metaphorical field, and describes the pattern of vein distribution in a wavy form.

[0018] The maximum value of the field along the central axis is assumed to correspond to the position of the secondary budding point, that is, ω = 1, and thus:

[0019]

[0020] Among them, n is an integer greater than zero. These circles mapped on the leaf have the same vertex, and each circle contains a secondary boundary point where the secondary vein connects to the main vein. Among them, when λ>1, the distance between adjacent secondary veins is d n -d n-1 =λ n -λn-1 When λ = 1, it is defined as the equal distance between adjacent secondary pulses.

[0021] Furthermore, the heat dissipation process is heating the bottom of the vein channel structure model and realizing the heat dissipation of the solid region by introducing a cooling fluid into the channel.

[0022] Furthermore, simulate the heat dissipation process of the vein channel structure in a physical field simulation software.

[0023] Furthermore, the total heat transfer coefficient η can be obtained by the following formula:

[0024]

[0025]

[0026] ΔP = P in -P out (6)

[0027]

[0028] where h is the average heat transfer coefficient of the channel, D h is the hydraulic diameter of the channel, k f is the thermal conductivity of the liquid, q w is the heat flux density of the heat source, A w is the area of the heat source, A con is the area of the channel participating in heat exchange, T w is the average temperature of the heat source, T f is the average temperature of the liquid, f is the surface friction coefficient, ΔP is the pressure drop at the inlet and outlet, l f is the length of the channel, ρ f is the density of the liquid, u in is the inlet liquid flow velocity, Nu0 and f0 are the relative Nusselt number and relative friction coefficient compared with the straight channel.

[0029] Furthermore, the objective function for optimizing the vein channel structure is:

[0030]

[0031] where η is the total heat transfer coefficient, F is the gas-liquid resistance coefficient in the heat spreader, Po is the dimensionless pressure loss term, μ v is the dynamic viscosity of the working fluid gas, n v is the number of working fluid gas channels, A v is the cross-sectional area of the working fluid gas channel, D h is the hydraulic diameter of the vein channel, ρ v is the density of the working fluid gas, h fg is the latent heat of phase change of the working fluid, μl is the dynamic viscosity of the liquid working medium, K is the permeability of the wick, and n wick is the number of the working medium wick / liquid return channels, and A wick is the cross-sectional area of the wick / liquid return channel, and ρ f is the liquid density.

[0032] Furthermore, the vein channel structure is optimized by a multi-objective algorithm.

[0033] The present invention also provides a vapor chamber gas-liquid channel structure design system based on the vein fractal rule.

[0034] The present invention also provides a computer device.

[0035] The present invention also provides a computer-readable storage medium.

[0036] Compared with the prior art, the present invention has the following advantages:

[0037] (1) The present invention can reduce the dependence on the experience of designers, improve the design efficiency of the vapor chamber, and shorten the development cycle.

[0038] (2) The vein-like structure gas-liquid channel of the present invention can guide the gas-liquid transport of the working medium, promote the gas-liquid exchange of the working medium, reduce the heat transfer thermal resistance between the working medium gas and liquid, make the heat generated by the heat source quickly uniform, and improve the heat transfer performance of the large-area ultra-thin vapor chamber and the heat dissipation efficiency of electronic devices.

[0039] (3) The working medium gas channel and the liquid channel of the present invention are separated from each other, which can effectively reduce the gas-liquid flow resistance in the ultra-thin space. The secondary vein structure of the vein-like gas-liquid channel avoids the complete isolation of the gas-liquid channel and ensures the normal progress of the gas-liquid exchange. Description of the Drawings

[0040] Figure 1 is a schematic diagram of the mathematical model of the vein channel structure based on the vein fractal rule in the embodiment of the present invention;

[0041] Figure 2 is a schematic diagram of the physical model of the vein channel structure in the embodiment of the present invention, wherein Figure (a) is a top view of the vein channel structure, and Figure (b) is an axonometric view;

[0042] Figure 3 is the (a) temperature nephogram, (b) pressure nephogram, and (c) velocity nephogram of the cross-section of the vein channel structure in the embodiment of the present invention;

[0043] Figure 4 is the solution flow chart of the design method in the embodiment of the present invention;

[0044] Figure 5Among them, (a) is a schematic diagram of the flow channel layout of the heat pipe gas-liquid channel structure obtained in the embodiment of the present invention, and (b) is a schematic diagram of the structure of the heat pipe. Detailed implementation manners

[0045] In order to enable those skilled in the art to better understand the solution of the present invention, the following will further elaborate on the present invention in conjunction with the drawings and specific implementation manners. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0046] A design method for the heat pipe gas-liquid channel structure based on the vein fractal rule provided by the embodiment of the present invention includes the following steps:

[0047] Step 1: As Figure 1 shown, based on the vein fractal rule, establish a mathematical model of the vein channel structure with coordinated main veins and secondary veins.

[0048] This step includes:

[0049] In order to reasonably design the arrangement of the biomimetic gas-liquid channels, the fractal rule of the veins is adopted on the basis of the natural branching rule. In the vein tube system of dicotyledons, some models depict rather precise long-range structural characteristics of the veins, which are determined and quantified according to the empirically derived mathematical models. The spatial pattern that generates a wavy shape in the model is called the metaphorical field. For the periodic characteristics of the leaf configuration, the empirical circular wave formula describing the complex symmetry of the dicotyledon vein tube system is as follows:

[0050]

[0051] Among them, ω represents the size of the metaphorical field, describing the pattern of vein distribution in a wavy form; λ is a constant related to the type of vein (λ≥1); d is the diameter of the metaphorical circle.

[0052] The maximum value of the field along the axis of the main vein is assumed to correspond to the position of the secondary budding point, that is, ω = 1, and thus:

[0053]

[0054] Among them, d n is the diameter of each metaphorical circle, and n is an integer greater than zero.

[0055] The circles mapped onto the leaf have the same vertices, and each circle contains a secondary boundary point where the secondary vein is connected to the main vein. Among them, when λ>1, the distance between adjacent secondary veins is d n -d n-1 =λn -λ n-1 ; When λ = 1, it is defined that the distances between adjacent secondary veins are equal.

[0056] Step 2: Determine the design parameters according to the mathematical model of the vein channel structure, such as Figure 2 As shown, establish a flow channel structure with coordinated main veins and secondary veins according to the mathematical model of the vein channel structure, construct a three-dimensional flow channel model of the vein channel structure with coordinated main veins and secondary veins in a 3D modeling tool, and determine the design parameters according to the flow channel structure parameters in the three-dimensional flow channel model. Then, use the fluid-solid coupling heat transfer physical field in the physical field simulation software to simulate the heat dissipation process of the vein channel structure.

[0057] The heat dissipation process is to heat the bottom of the three-dimensional flow channel model of the vein channel structure, and realize the heat dissipation of the solid region by introducing a cooling fluid into the vein channel.

[0058] In some embodiments of the present invention, the 3D modeling tool uses ANSYS, and the physical field simulation software uses Fluent.

[0059] In some embodiments of the present invention, the design parameters include the vein structure parameter λ, the secondary vein length L, the secondary vein width W, and the secondary vein angle θ A ; The geometric size of the calculation domain of the three-dimensional flow channel model of the vein channel structure is 180mm × 50mm × 10mm, the thickness size of the vein channel structure is 5mm, and the width size of the inlet and outlet of the vein channel structure is 10mm.

[0060] Step 3: Set the boundary conditions according to the material parameters, heat source, and working conditions.

[0061] The working conditions include the heat flux density of the heat source, the flow velocity at the inlet of the vein channel, the pressure at the outlet of the vein channel, and the liquid temperature.

[0062] The boundary condition is to heat the bottom of the three-dimensional flow channel model of the vein channel structure, and realize the heat dissipation of the solid region by introducing a cooling fluid into the vein channel; In some embodiments of the present invention, the specific boundary settings are as follows: the solid domain material of the vein channel structure is Al(6061), the liquid material is water, the heat flux density of the heat source is 5000W / m 2 , the flow velocity at the channel inlet is 5L / min, the pressure at the channel outlet is 0Pa, and the cooling water temperature is 300K.

[0063] Step 4: According to the three-dimensional flow channel model of the vein channel structure in Step 2, determine the value range of the design parameters and set the initial values. Then, solve through the physical field simulation software to obtain the temperature, pressure, and velocity field distributions of the vein channel structure at the initial values.

[0064] In some embodiments of the present invention, the value ranges and initial values of the design parameters are shown in Table 1. The temperature, pressure, and velocity field distributions of the vein channel structure at the initial values obtained by solving with Fluent software are as Figure 3 shown.

[0065] Table 1 Design parameters of the vein channel structure

[0066]

[0067] Step 5: Define the overall heat transfer coefficient η as the criterion for judging the heat and mass transfer performance of the vein channel structure. According to the solution process in Step 4, the overall heat transfer coefficient η corresponding to different design parameters can be obtained. Use the Box - Benhnken central composite experimental method in response surface design to design a multi - factor orthogonal experiment, and perform data analysis through Design - expert software and establish a corresponding quartic polynomial regression equation of four variables to determine the influence law of each design parameter on the heat and mass transfer performance of the vein channel structure.

[0068] The overall heat transfer coefficient η can be obtained by the following formula:

[0069]

[0070] ΔP = P in - P out (6)

[0071]

[0072] where Nu is the Nusselt number of the vein channel, h is the average heat transfer coefficient of the vein channel, f is the surface friction coefficient, ΔP is the pressure drop at the inlet and outlet, D h is the hydraulic diameter of the vein channel, k f is the thermal conductivity of the liquid, q w is the heat flux density of the heat source, A w is the area of the heat source, A con is the area of the vein channel participating in heat exchange, T w is the average temperature of the heat source, T f is the average temperature of the liquid, L is the length of the secondary vein, ρ f is the density of the liquid, u in is the inlet liquid flow velocity, Nu0 and f0 are the relative Nusselt number and relative friction coefficient compared with the straight channel.

[0073] Step 6: According to the heat and mass transfer characteristics of the vein channel structure and the heat pipe, with the goal of maximizing the overall heat transfer coefficient of the vein channel structure and minimizing the gas - liquid resistance in the heat pipe, optimize the vein channel structure through a multi - objective genetic algorithm.

[0074] Among them, the expression of the objective function is:

[0075]

[0076] Among them, F is the gas-liquid resistance coefficient in the heat pipe, Po is the dimensionless pressure loss term, μ v is the dynamic viscosity of the working fluid gas, n v is the number of working fluid gas channels, A v is the cross-sectional area of the working fluid gas channel, ρ v is the density of the working fluid gas, h fg is the latent heat of phase change of the working fluid, μ l is the dynamic viscosity of the liquid working fluid, K is the permeability of the wick, n wick is the number of working fluid wick / liquid return channels, A wick is the cross-sectional area of the wick / liquid return channel; among them, the wick structure is placed in the main vein of the leaf vein structure, and the gas channel is between adjacent leaf vein structures.

[0077] In some embodiments of the present invention, the other parameter values are defined as follows: the heat pipe includes an upper shell plate and a lower shell plate, a wick and a gas channel are arranged between the upper shell plate and the lower shell plate, wherein the thickness of the heat pipe is 2 mm, the thicknesses of the upper shell plate and the lower shell plate are both 0.4 mm, the thicknesses of the wick and the gas channel are both 1.2 mm, the area of the heat pipe is 600 mm×290 mm, and the permeability of the wick is 6*10^-10 m 2 .

[0078] Step 7: Determine whether the optimized leaf vein channel structure meets the size and deformation limitations during the manufacturing and use of the channel. If it meets the requirements, the optimization design of the leaf vein channel structure is completed. If it does not meet the requirements, generate a new design point and continue to repeat the optimization process in Step 6 until it meets the standards.

[0079] The constraint condition of the leaf vein channel structure is the size and deformation limitations during the manufacturing and use of the channel. In some embodiments of the present invention, 0.1% of the shell plate thickness is used as the size and deformation quantity limitation.

[0080] In some embodiments of the present invention, the gas-liquid channel is formed by the blow molding process, the outer shell material of the heat pipe is aluminum alloy 6061, and the width range of the gas-liquid channel needs to be controlled within 5-10 mm.

[0081] Table 2 Design parameters of the gas-liquid channel structure of the heat pipe based on leaf veins

[0082]

[0083] Step 8: Adjust the flow channel layout according to the adiabatic section size of the heat pipe and the limitations of the manufacturing process on the flow channel width and support structure size for the vein channel structure obtained in Step 7, so as to obtain the final layout of the gas-liquid channels of the heat pipe.

[0084] In some embodiments of the present invention, the final layout of the gas-liquid channels of the heat pipe is as Figure 5 shown. Among them, the vein channel structure is located between the evaporation end and the condensation end, realizing the improvement of the gas-liquid exchange efficiency and the uniform temperature performance of the heat pipe.

[0085] In some embodiments of the present invention, a design system for the gas-liquid channel structure of a heat pipe based on the vein fractal rule is provided, which is used to implement the steps of the method provided in the foregoing embodiments. The system includes the following modules:

[0086] A vein channel structure mathematical model establishment module, which is used to establish a mathematical model of the vein channel structure with coordinated main veins and secondary veins based on the vein fractal rule;

[0087] A design parameter determination and heat dissipation simulation module, which is used to establish a flow channel structure with coordinated main veins and secondary veins according to the mathematical model of the vein channel structure, construct a three-dimensional flow channel model of the vein channel structure, determine the design parameters according to the flow channel structure parameters in the three-dimensional flow channel model, and then simulate the heat dissipation process of the vein channel structure;

[0088] A boundary condition setting module, which is used to set boundary conditions according to material parameters, heat sources, and working conditions;

[0089] A module for obtaining the temperature, pressure, and velocity field distributions of the vein channel structure, which is used to determine the value range of the design parameters according to the three-dimensional flow channel model of the vein channel structure, set the initial values, and then solve to obtain the temperature, pressure, and velocity field distributions of the vein channel structure at the initial values;

[0090] A total heat transfer coefficient determination module, which is used to define the total heat transfer coefficient η as a standard for judging the heat transfer and mass transfer performance of the vein channel structure, and is based on the functional relationship between the solved design parameters and the total heat transfer coefficient η;

[0091] A vein channel structure optimization module, which optimizes the vein channel structure with the optimization goal of maximizing the total heat transfer coefficient of the vein structure flow channel and minimizing the gas-liquid resistance in the heat pipe according to the heat transfer and mass transfer characteristics of the vein structure channel and the heat pipe;

[0092] A judgment module, which is used to judge whether the optimized vein channel structure meets the preset requirements;

[0093] A layout module, which is used to adjust the flow channel layout according to the usage requirement size of the heat pipe for the optimized vein channel structure that meets the preset requirements, so as to obtain the final layout of the gas-liquid channels of the heat pipe.

[0094] In some embodiments of the present invention, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the method provided in the foregoing embodiments is implemented.

[0095] In some embodiments of the present invention, a computer-readable storage medium is provided. The computer-readable storage medium stores a computer program, characterized in that when the computer program is executed by a processor, the method provided in the foregoing embodiments is implemented.

[0096] In the embodiments of the present invention, based on the fractal law of plant leaf veins, the structures of the main veins and secondary veins of the leaf vein channels are designed; the key geometric parameters of the leaf vein channel structure are selected as optimization variables, with the minimization of flow resistance and the maximization of heat transfer performance as the optimization objectives, and constraints are established by combining manufacturing deformation and size limitations. The leaf vein channel structure is optimized through a multi-objective algorithm; finally, the gas-liquid channel layout of the heat pipe is obtained according to the optimization results and actual application requirements. By adopting the fractal channel structure of the leaf veins, the flow resistance can be reduced, and the uniform temperature performance of the heat pipe can be improved while enhancing the gas-liquid exchange efficiency.

[0097] The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A design method for the gas-liquid channel structure of a heat pipe based on the vein fractal rule, characterized in that, Including the following steps: Based on the vein fractal law, establish a mathematical model of the vein channel structure with the cooperation of the main vein and secondary veins; According to the mathematical model of the vein channel structure, establish a flow channel structure with the cooperation of the main vein and secondary veins, construct a three-dimensional flow channel model of the vein channel structure, determine the design parameters according to the flow channel structure parameters in the three-dimensional flow channel model, and then simulate the heat dissipation process of the vein channel structure; Set boundary conditions according to material parameters, heat sources, and working conditions; According to the three-dimensional flow channel model of the vein channel structure, determine the value range of the design parameters and set the initial values, and then solve to obtain the temperature, pressure, and velocity field distributions of the vein channel structure at the initial values; Define the overall heat transfer coefficient η as the standard for judging the heat and mass transfer performance of the vein channel structure, and based on the functional relationship between the solved design parameters and the overall heat transfer coefficient η; According to the heat and mass transfer characteristics of the vein structure channel and the heat sink, optimize the vein channel structure with the goal of maximizing the total heat transfer coefficient of the vein structure flow channel and minimizing the gas-liquid resistance in the heat sink; Judge whether the optimized vein channel structure meets the preset requirements; Adjust the flow channel layout of the optimized vein channel structure that meets the preset requirements according to the size requirements of the heat sink for use, so as to obtain the final layout of the gas-liquid channels of the heat sink.

2. A design method for the vapor chamber gas-liquid channel structure based on the vein fractal law according to claim 1, characterized in that The mathematical model of the vein channel structure is: Construct an empirical circular wave formula describing the complex symmetry of the dicotyledonous vein tube system as follows: Where λ is a constant related to the type of vein; d is the metaphorical circle diameter; ω represents the size of the metaphorical field used to generate the spatial pattern of the wave shape, and describes the pattern of vein distribution in a wave-like form; Assume that the maximum value of the field along the central axis of the main vein corresponds to the position of the secondary budding point, that is, ω = 1, and obtain: where d n is the diameter of each metaphorical circle, and n is an integer greater than zero; The metaphorical circles mapped onto the leaf blades have the same vertices, and each metaphorical circle contains a secondary boundary point where the secondary vein connects to the primary vein; wherein, when λ > 1, the distance between adjacent secondary veins is d n -d n-1 = λ n -λ n-1 ; when λ = 1, it is defined that the distances between adjacent secondary veins are equal.

3. A design method for the vapor-liquid channel structure of a heat pipe based on the vein fractal law according to claim 1, characterized in that Construct a three-dimensional flow channel model of the vein channel structure with the cooperation of the main vein and secondary veins in a 3D modeling tool.

4. A design method for the gas-liquid channel structure of a heat pipe based on the vein fractal rule according to claim 1, characterized in that Simulate the heat dissipation process of the vein channel structure in a physical field simulation software.

5. A design method for the vapor-liquid channel structure of a heat pipe based on the vein fractal law according to claim 1, characterized in that, The expression of the overall heat transfer coefficient is: Where η is the overall heat transfer coefficient, Nu0 and f0 are the relative Nusselt number and relative friction coefficient compared with the straight channel, f is the surface friction coefficient, and Nu is the Nusselt number of the vein channel.

6. A design method for the vapor-liquid channel structure of a heat pipe based on the vein fractal rule according to claim 1, characterized in that The objective function for optimizing the vein channel structure is: Among them, η is the overall heat transfer coefficient, F is the gas-liquid resistance coefficient in the vapor chamber, Po is the dimensionless pressure loss term, μ v is the dynamic viscosity of the working fluid gas, n v is the number of working fluid gas channels, A v is the cross-sectional area of the working fluid gas channels, D h is the hydraulic diameter of the vein channels, ρ v is the density of the working fluid gas, h fg is the latent heat of phase change of the working fluid, μ l is the dynamic viscosity of the liquid working fluid, K is the permeability of the wick, n wick is the number of working fluid wick / liquid return channels, A wick is the cross-sectional area of the wick / liquid return channels, ρ f is the liquid density.

7. A design method for the vapor chamber gas-liquid channel structure based on the vein fractal rule according to any one of claims 1-6, characterized in that Optimize the vein channel structure through a multi-objective algorithm.

8. A heat pipe gas-liquid channel structure design system based on the vein fractal law, characterized in that, For implementing the method steps described in any one of claims 1-7, the system includes the following modules: A vein channel structure mathematical model establishment module, which is used to establish a mathematical model of the vein channel structure with the cooperation of the main vein and secondary veins based on the vein fractal law; A design parameter determination and heat dissipation simulation module, which is used to establish a flow channel structure with the cooperation of the main vein and secondary veins according to the mathematical model of the vein channel structure, construct a three-dimensional flow channel model of the vein channel structure, determine the design parameters according to the flow channel structure parameters in the three-dimensional flow channel model, and then simulate the heat dissipation process of the vein channel structure; A boundary condition setting module, which is used to set boundary conditions according to material parameters, heat sources, and working conditions; The temperature, pressure and velocity field distribution acquisition module of the vein channel structure is used to determine the value range of design parameters according to the three-dimensional flow channel model of the vein channel structure, set the initial values, and then solve to obtain the temperature, pressure and velocity field distribution of the vein channel structure at the initial values; The total heat transfer coefficient determination module is used to define the total heat transfer coefficient η as the standard for judging the heat and mass transfer performance of the vein channel structure, and is based on the functional relationship between the solved design parameters and the total heat transfer coefficient η; The vein channel structure optimization module optimizes the vein channel structure with the goal of maximizing the total heat transfer coefficient of the vein structure flow channel and minimizing the gas-liquid resistance in the heat sink, according to the heat and mass transfer characteristics of the vein structure channel and the heat sink; The judgment module is used to judge whether the optimized vein channel structure meets the preset requirements; The layout module is used to adjust the flow channel layout of the optimized vein channel structure that meets the preset requirements according to the size requirements of the heat sink in use, so as to obtain the final layout of the gas-liquid channels of the heat sink.

9. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method according to any one of claims 1 to 7.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the method according to any one of claims 1 to 7.

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