CN-121980879-A - Design method and device of gradient porous bending-resistant heat pipe based on TPMS

CN121980879ACN 121980879 ACN121980879 ACN 121980879ACN-121980879-A

Abstract

The application discloses a design method and a device of a gradient porous bending-resistant heat pipe based on a TPMS (tire pressure monitor System), wherein the method comprises the steps of constructing a skeleton type liquid suction core basic structure according to a structural equation of a three-period minimum curved surface, converting a coordinate system to adapt to geometric features of the heat pipe to obtain a conformal structure, correcting distortion of the conformal structure, dividing the conformal structure into a plurality of tiny square lattices, constructing a quadratic polynomial regression model based on equation parameters and porosities of structural equations of the tiny square lattices, determining target porosities of all areas of the heat pipe, determining equation parameters by utilizing the quadratic polynomial regression model, endowing the equation parameters to the TPMS capillary structure of the corresponding area of the heat pipe, and realizing accurate regulation and control of the porosities to obtain the bending-resistant heat pipe. The capillary structure solves the problems that the capillary structure of the existing heat pipe cannot achieve balance among low cost, bending resistance, no directional limitation and high heat transfer performance, and further the requirements of high-end electronic equipment on the conformal adaptation, flexible installation and long-acting stability of the heat pipe are difficult to meet.

Inventors

TANG GUIHUA
HUANG WEISHI
Ning Hanyu
LI ZHE
ZHANG ZEGUO

Assignees

西安交通大学

Dates

Publication Date: 20260505
Application Date: 20260408

Claims (10)

1. The design method of the gradient porous bending-resistant heat pipe based on the TPMS is characterized by comprising the following steps of: selecting a three-period minimum curved surface according to a target working condition, and constructing a skeleton type liquid suction core basic structure according to a structural equation of the minimum curved surface; Performing coordinate system conversion on the framework type liquid suction core basic structure to adapt to the geometric characteristics of the heat pipe, obtaining a conformal structure, and correcting the structural equation to realize distortion correction of the conformal structure; dividing the conformal structure into a plurality of tiny square lattices, and constructing a quadratic polynomial regression model for predicting the relation between equation parameters and porosity based on the equation parameters and the porosity of a structural equation of each tiny square lattice; determining target porosity of each region of the heat pipe by using Laplace-Young equation, and determining equation parameters by using the quadratic polynomial regression model according to the target porosity; and (3) endowing the equation parameters to a TPMS capillary structure of a corresponding region of the heat pipe so as to realize accurate regulation and control of porosity and obtain the bending-resistant heat pipe.
2. The method of claim 1, wherein the structural equation is as follows: ; In the formula, The structural equation is represented as a function of, Three-dimensional coordinates representing a point in three-dimensional space, L, a and c represent equation parameters of the structural equation, L, a is a coefficient, c is a constant term, Representing a curved surface feature function.
3. The method of claim 1, wherein the skeletal-type wick infrastructure is as follows: ; In the formula, Representing a skeletal wick infrastructure, A decision threshold representing the generation of the structure, Representing the structural equation after mapping to the polar coordinate system.
4. The method of claim 1, wherein said transforming the skeletal wick infrastructure to adapt the geometric features of the heat pipe to obtain a conformal structure, and correcting the structural equation to achieve distortion correction of the conformal structure comprises: transforming the structural equation to map the skeletal wick infrastructure in a rectangular coordinate system to a polar coordinate system; the method comprises the steps of using a central line of bending of a heat pipe as a bending path, and establishing a mapping relation from a polar coordinate system to a global three-dimensional space coordinate system by using a Frenet-Serset frame so as to ensure tangential consistency of a capillary channel and a fluid flow direction and obtain a conformal structure; Constructing a jacobian matrix mapped from the framework type liquid suction core basic structure to a bending path of the heat pipe under a polar coordinate system; Determining a compensation factor by solving the jacobian matrix so as to correct constant terms of a structural equation; based on Gauss-Bonnet theorem, extracting the surface curvature of the skeleton-type liquid absorption core basic structure, constructing a regularized level set functional equation containing curvature extremum penalty term, and correcting the coefficients of the structural equation again to realize the distortion correction of the conformal structure.
5. The method of claim 1, wherein constructing a quadratic polynomial regression model for predicting the relationship between equation parameters and porosity based on equation parameters and porosity of the structural equation of each micro square lattice comprises: Acquiring the volume ratio, the space position and the corresponding equation parameters of each micro square lattice in TPMS unit cells of the framework type liquid absorption core basic structure; Based on a plurality of tiny square lattices, a Box-Behnken response surface design method is utilized, equation parameters of a structural equation are used as independent variables, porosity and volume ratio of the conformal structure are used as dependent variables, and a quadratic polynomial regression model is constructed through a quadratic polynomial function so as to predict the relation between the equation parameters and the porosity.
6. The method of claim 1, wherein determining the target porosity for each region of the heat pipe using the Laplace-Young equation, and determining equation parameters using the quadratic polynomial regression model based on the target porosity, comprises: Quantifying the relation between capillary pressure and pore structure through Laplace-Young equation to determine the target porosity of each region of the heat pipe; solving equation parameters by utilizing the quadratic polynomial regression model according to the target porosity; adjusting the porosity to vary linearly along the z-axis based on the equation parameters such that the porosity increases gradually from the evaporator section to the condenser section; Determining radial porosity of a condensing section, radial porosity of a wall surface side and radial porosity of an evaporating section based on the equation parameters, and respectively adjusting the radial porosity of the condensing section, the radial porosity of the wall surface side and the radial porosity of the evaporating section so as to improve the condensing and evaporating efficiency of the heat pipe; And a plurality of pore channels are uniformly arranged along the steam cavity side of the evaporation section, and each pore channel corresponds to each TPMS cell in the follow-up structure one by one so as to reduce steam escape resistance.
7. The method of claim 6, wherein the relationship of capillary pressure to pore structure is quantified by the Laplace-Young equation as follows: ; In the formula, Representing the capillary pressure, the capillary pressure is indicated, Represents the surface tension of the liquid working medium, Indicating the contact angle formed by the working fluid and the wick material, Indicating the effective capillary pore size of the pores.
8. A TPMS-based gradient porous kink-resistant heat pipe design apparatus for implementing the method of any one of claims 1-7, comprising: The basic construction module is used for selecting a three-period minimum curved surface according to a target working condition and constructing a skeleton type liquid suction core basic structure according to a structural equation of the basic construction module; The geometric adaptation module is used for converting a coordinate system of the framework type liquid suction core basic structure to adapt to geometric characteristics of the heat pipe, so as to obtain a conformal structure, and correcting the structural equation to realize distortion correction of the conformal structure; The simplification module is used for dividing the conformal structure into a plurality of tiny square lattices, and constructing a quadratic polynomial regression model for predicting the relation between equation parameters and porosity based on the equation parameters and the porosity of the structural equation of each tiny square lattice; the solving module is used for determining target porosity of each region of the heat pipe by using a Laplace-Young equation, and determining equation parameters by using the quadratic polynomial regression model according to the target porosity; And the gradient optimization module is used for endowing equation parameters to the TPMS capillary structure of the corresponding area of the heat pipe so as to realize accurate regulation and control of porosity and obtain the bending-resistant heat pipe.
9. An apparatus for performing a design method of a TPMS-based gradient porous kink-resistant heat pipe, comprising: A processor; A memory for storing processor-executable instructions; The processor, when executing the executable instructions, implements the method of any one of claims 1 to 7.
10. A non-transitory computer readable storage medium comprising instructions for storing a computer program or instructions which, when executed, cause the method of any one of claims 1 to 7 to be implemented.

Description

Design method and device of gradient porous bending-resistant heat pipe based on TPMS Technical Field The application relates to the technical field of thermal management, in particular to a design method and device of a gradient porous bending-resistant heat pipe based on TPMS. Background With the rapid evolution of technologies such as artificial intelligence and high-performance computing, the computing power demand of electronic devices continues to burst, the power density of chips and modules continues to rise, and heat dissipation has become a key to restrict the performance and reliability of electronic devices. The heat pipe is used as a high-efficiency two-phase heat transfer element, can rapidly guide out heat from a heat source, ensures that electronic equipment operates in a stable temperature environment, is widely applied to the field of high-end electronic manufacturing, and has important significance for improving the core competitiveness of the electronic industry. The capillary structure of the main stream heat pipe is mainly divided into powder sintering heat pipe and groove type heat pipe. The powder sintering type heat pipe provides capillary force by sintering metal powder on the inner wall of the pipe to form a porous sintering layer, has good heat transfer stability, but has complex preparation process and high technical threshold, so that the manufacturing cost is high, and meanwhile, the difficulty of parameter control in the sintering process is high, and the thermal resistance is relatively high. The groove type heat pipe has the advantages of low cost and simple process by forming an axial groove in the pipe wall as a capillary channel through mechanical processing, but the capillary force is strictly limited by the trend of the groove, and the strong direction dependence is shown. In addition, the groove structure is easy to deform during bending, so that the heat transfer performance is greatly reduced, and the bending installation requirement in complex layout is difficult to adapt. In addition, the two structures are not optimized in a differentiation way according to the condensation section and the evaporation section of the heat pipe, the specific surface area of the condensation section is insufficient, the steam escape resistance of the evaporation section is high, and the overall heat transfer efficiency is restricted. Moreover, the prior art cannot achieve balance among low cost, bending resistance, no directional limitation and high heat transfer performance, and is difficult to meet the requirements of high-end electronic equipment on heat pipe shape following design, flexible installation and long-acting stability. Disclosure of Invention The embodiment of the application solves the problems that the capillary structure of the traditional heat pipe cannot achieve balance among low cost, bending resistance, non-directional limitation and high heat transfer performance by providing the design method and the device of the gradient porous bending resistance heat pipe based on the TPMS, and further, the requirements of high-end electronic equipment on the shape following adaptation, flexible installation and long-acting stability of the heat pipe are difficult to meet. In a first aspect, an embodiment of the present application provides a method for designing a gradient porous anti-bending heat pipe based on a TPMS, including: selecting a three-period minimum curved surface according to a target working condition, and constructing a skeleton type liquid suction core basic structure according to a structural equation of the minimum curved surface; Performing coordinate system conversion on the framework type liquid suction core basic structure to adapt to the geometric characteristics of the heat pipe, obtaining a conformal structure, and correcting the structural equation to realize distortion correction of the conformal structure; dividing the conformal structure into a plurality of tiny square lattices, and constructing a quadratic polynomial regression model for predicting the relation between equation parameters and porosity based on the equation parameters and the porosity of a structural equation of each tiny square lattice; determining target porosity of each region of the heat pipe by using Laplace-Young equation, and determining equation parameters by using the quadratic polynomial regression model according to the target porosity; and (3) endowing the equation parameters to a TPMS capillary structure of a corresponding region of the heat pipe so as to realize accurate regulation and control of porosity and obtain the bending-resistant heat pipe. With reference to the first aspect, in one possible implementation manner, the structural equation is as follows: ; In the formula, The structural equation is represented as a function of,Three-dimensional coordinates representing a point in three-dimensional space, L, a and c represent equation parameters of the stru