Novel method for constructing surface structure of three-period minimal curved surface (TPMS)

Abstract

The invention relates to the field of one-way convective heat transfer strengthening, a three-period minimal curved surface (TPMS) is used as a substrate, a fin structure with three-period minimal curved surface structural characteristics is constructed on the surface of the minimal curved surface by utilizing a topological tool, the convective heat transfer performance of the three-period minimal curved surface is further optimized, and the flow resistance of the three-period minimal curved surface is reduced. The TPMS can be used as a heat exchange structure to be applied to a heat exchange manager and heat dissipation equipment. The invention provides a novel three-period minimal curved surface rib structure construction method. A TPMS with a large thickness, a set of fins with TPMS structural characteristics and a TPMS with a small thickness are included. According to the fins with the TPMS structural characteristics, in three-dimensional modeling software, a set of parallel fins and a TPMS model with the large thickness coincide, and the intersecting part of the fins and the TPMS model is taken. Secondly, the spacing, the rib thickness and the arrangement direction of the ribs are properly adjusted or the thickness of the TPMS is changed in a topological tool, so that the structure of the ribs can be controlled, and different types of rib groups are formed; a rib with TPMS structural characteristics is overlapped with a TPMS model with a smaller thickness, and a union set of the rib and the TPMS model is taken, that is, a rib-shaped structure is added on the surface of the TPMS. Different series of TPMS fin groups can be combined with the TPMS to generate different effects, and the TPMS fin groups have obvious effects on optimizing the one-way convective heat transfer performance of the TPMS and reducing the flow resistance of the TPMS.

Description

Technical field:

[0001] The invention relates to the field of convective heat transfer enhancement, and provides a novel three-period minimal surface (TPMS) surface structure method - adding a ribbed surface structure. Technical background:

[0002] TPMS was first proposed by mathematician HA Schwarz in 1890. Subsequently, Schwarz and Neovius successively proposed five new TPMS, including Primitive, Diamond, and Nervious. In terms of heat transfer, the research on TPMS mainly includes heat conduction, phase change heat transfer, natural convection heat transfer, and forced convection heat transfer.

[0003] There are many types of TPMS found so far, some of which are found in animals and plants. Under the influence of natural selection, these TPMS bionic structures have the advantages of light weight, large specific surface area, good mechanical properties, etc., and the TPMS itself has the characteristics of being unbounded, periodic, non-self-intersecting, and having an average curvature of 0. The characteristics of these bionic TPMS structures are very consistent with the technical requirements of thermal management equipment, and are used in heat dissipation and heat exchange equipment as a new type of heat exchange structure.

[0004] The research on TPMS single-sided convection heat transfer enhancement is still in its infancy. In the research on single-sided convection heat transfer enhancement, one of the widely used technical routes is to achieve it through optimizing the geometric structure, but there are few technical solutions and it cannot meet the needs of the research on TPMS convection heat transfer enhancement.

[0005] The present invention provides a new geometric structure optimization solution in the field of TPMS convection heat transfer enhancement, which can be used to derive more technical solutions and has good application prospects. Summary of the invention:

[0006] At present, in the research of TPMS in the field of convection heat transfer enhancement, without adding surface structure, By using topology tools, rewriting the TPMS control equation or adding parameters, changing the TPMS boundary thickness, gradually changing the thickness along a specific direction, changing the TPMS passage aperture or curvature, the flow velocity and flow direction of the fluid passing through the TPMS are changed, and the heat transfer performance of the TPMS is enhanced.

[0007] The above-mentioned TPMS surface structure provides a reference for the present invention. The present invention adds a TPMS rib surface structure in the three-dimensional topology tool.

[0008] The present invention adds a fluid boundary layer on the original surface of the TPMS, changes the surface of the fluid passage, and when the fluid passes through the TPMS structure, vortices and secondary flows are formed near the fins, compressing the thermal boundary layer, affecting the continuity of the fluid, limiting its thickness or causing rupture, and increasing the heat exchange area, thereby enhancing the convective heat transfer performance of the TPMS or reducing the flow resistance.

[0009] The purpose of the present invention is to provide a new construction method for controlling the geometric structure of TPMS without changing the TPMS control equation, so that the fluid generates a larger vortex in the boundary layer and optimizes the convective heat transfer performance of TPMS.

[0010] To achieve the above purpose, the technical solution of the present invention is as follows:

[0011] S1. In the 3D modeling software, two TPMS models with different thicknesses are established.

[0012] S2. Draw a series of rectangular fin sketches with small width and appropriate spacing on one side of the TPMS model. Use the topology tool to stretch the sketch to form a complete set of fins until they just penetrate the other side of the model.

[0013] S3. Using topological tools, the combined model established above is taken to obtain the intersection of the combined model to obtain a set of fins with TPMS structural characteristics.

[0014] S4. Combine the TPMS fin with the newly established TPMS model with a smaller thickness offset coefficient until the two are completely consistent in space, that is, form a TPMS with a fin surface structure.

[0015] There are many structures of TPMS in nature, so a Gyroid-type TPMS is used. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to be limited to the Gyroid-type TPMS. Description of the drawings:

[0016] Figure 1 This is a schematic diagram of the fin structure with TPMS structural characteristics.

[0017] Figure 2 A schematic diagram showing a structure formed by combining a fin having TPMS structural characteristics with a TPMS having a smaller thickness.

[0018] Figure 3 A detailed flowchart showing the process of adding a horizontal fin structure on a three-periodic minimal surface.

[0019] Figure 4 It is a schematic diagram of the process of adding a fin structure with a 45-degree inclination angle on a three-periodic minimal surface. Specific implementation method:

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more understandable, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] The specific example uses a Gyroid TPMS. It should be understood that the specific embodiments described herein are only used to explain the present invention, are only part of the embodiments of the present invention, but not all of the embodiments, and are not intended to be limited to the Gyroid TPMS.

[0022] like Figure 1 The thicker Gyroid TPMS (1) and a set of tetrahedral fins (2) are shown in the figure. The thicker TPMS model is combined with the tetrahedral fin set, and the intersection has the structural characteristics of the TPMS. The two are combined and the intersection is taken to obtain a set of fins with the structural characteristics of the Gyroid TPMS.

[0023] like Figure 2 , the Gyroid type TPMS (4) with a smaller thickness and the fin (3) with TPMS structural characteristics in the figure are characterized by: using TPMS models of the same size but different thicknesses, so that the fin has a certain thickness, can overlap with the TPMS model with a smaller thickness, and highlight the fin structure on the surface.

[0024] like Figure 2 , a Gyroid-type TPMS (4) with a smaller thickness is combined with a fin (3) having the structural characteristics of a TPMS, and the two are taken as a union to obtain a Gyroid-type TPMS with a fin surface structure. A Gyroid-type TPMS with an appropriate thickness has good convective heat transfer performance. By adding a fin structure, a fluid boundary layer is added to the original surface of the TPMS, and a larger vortex is formed when the fluid passes through, squeezing the thermal boundary layer, limiting its thickness or causing rupture, and further optimizing the convective heat transfer performance of the TPMS.

[0025] The technical solution, working principle and implementation effect of a novel three-periodic minimal surface fin structure construction method are described in detail below through specific embodiments.

[0026] A novel method for constructing a TPMS rib-shaped surface structure includes two TPMSs with different thicknesses and a group of ribs with TPMS structural characteristics.

[0027] According to the novel three-periodic minimal surface fin structure construction method, the specific modeling steps are described using the Gyroid TPMS as an example: S1. First, use mathematical modeling software to output and establish the Gyroid TPMS function: cos(x)*sin(y)+cos(y)*sin(z)+cos(z)*sin(x)=c S2. Since the default period of the function is 2π, it is necessary to scale x, y, and z in the function at the same time; S3. Import the output Gyroid TPMS into the 3D topology tool, reconstruct the mesh of the TPMS model, and use the 3D topology tool to modify the offset coefficient c, which is the wall thickness of the TPMS model. First, offset a Gyroid TPMS with a larger thickness, and then offset a model with a smaller thickness; S4, importing the Gyroid TPMS model with a larger offset thickness into a three-dimensional modeling software, and in the modeling software, overlapping a series of fins with the Gyroid TPMS model with a larger thickness, taking the intersection of the two, and obtaining a set of fins with structural characteristics of the Gyroid TPMS; S5. Overlap the TPMS fin with the TPMS model of smaller thickness. Overlap the two in space and take the union to obtain a Gyroid-type TPMS model with a fin surface structure.

[0028] According to the novel three-periodic minimal surface rib structure construction method, the characteristic is that a group of ribs with TPMS structural characteristics is a combination of a TPMS model and a series of tetrahedral ribs, and the intersection and overlap of the two are taken. The final TPMS geometry can be precisely controlled by changing its thickness, spacing, arrangement direction or changing the TPMS thickness.

[0029] The present invention adds a rib structure to the TPMS surface, that is, adds a fluid boundary layer to the original smooth surface, changes the surface shape of the fluid passage, and makes the continuous change of the fluid process through the complex TPMS structure form a larger turbulence, forms vortices and secondary flows near the ribs, squeezes the thermal boundary layer, limits its thickness or ruptures it, resulting in a higher heat transfer rate, and enhances the convective heat transfer performance of the TPMS or reduces the flow resistance.

[0030] A novel TPMS surface rib structure construction method proposed in the present application has a good effect on optimizing the heat transfer performance or reducing the flow resistance of the TPMS.

[0031] As mentioned above, adding TPMS fins can change the TPMS geometry, form a larger vortex, and affect the convective heat transfer enhancement mechanism. This method is applicable to other types of TPMS and is not limited to Gyroid-type TPMS. The shape, thickness, and direction of the fins are all adjustable, and the TPMS geometry can be precisely controlled. Therefore, it has good prospects in the field of TPMS heat transfer. The above is only the preferred technical solution of the present invention. Based on the embodiments of this patent, all other examples obtained by ordinary technicians in this field without innovative labor are within the scope of protection of the invention patent. In summary, the content of this specification should not be understood as a limitation on the ideas of the present invention.

Claims

1. A novel method for constructing a rib-shaped structure on a three-periodic minimal surface (TPMS), comprising a TPMS with a thicker side wall (1), a group of tetrahedral fins (2), a group of fins with TPMS structural characteristics (3), and a TPMS with a thinner side wall (4).

2. According to claim 1, the novel method for constructing a rib-shaped structure on the surface of TPMS is characterized in that: The following steps are involved: Output the control equations in the mathematical modeling software and establish the TPMS model; Using the 3D modeling topology tool, rewrite the parameter c, adjust the overall thickness of the TPMS, and obtain two TPMS with different thicknesses; The thicker TPMS is overlapped with a set of tetrahedral fins in the three-dimensional software, and the intersection of the two is taken to obtain a set of fins with the structural characteristics of the TPMS; The fins are combined with a TPMS with a smaller thickness, and they completely overlap in space, that is, a TPMS model with a fin surface structure.

3. According to claim 1, the novel method for constructing a TPMS surface rib structure is characterized by: There are many structures of TPMS in nature. The construction method described is applicable to most studies on TPMS unidirectional convection heat transfer and is not limited to the following specific embodiment Gyroid.

4. According to claim 2, the novel method for constructing a rib-shaped structure on the surface of a TPMS is characterized by: In the mathematical modeling software, the default period of the control equation is 2π, which can be scaled. The parameter c in the control equation is the offset coefficient for adjusting the TPMS structure. The side wall thickness can be adjusted, that is, the overall thickness of the TPMS can be adjusted, and the aperture of the fluid passage can be changed.

5. According to claim 2, the novel method for constructing a rib-shaped structure on the surface of a TPMS is characterized by: The rib (3) having the structural characteristics of a TPMS is the portion where the TPMS and the rib intersect. The overall size of the TPMS rib structure is the same as that of the TPMS and has the structural characteristics of a TPMS with a larger thickness. It completely overlaps with the TPMS (4) with a smaller thickness in space and can show the rib structure on the surface.

6. The novel method for constructing a rib-shaped surface structure of TPMS as claimed in claim 2, characterized in that: A group of tetrahedral fins (2) overlapping with the TPMS can appropriately adjust the number, spacing, rib thickness, and arrangement direction of the fins or change the thickness of the TPMS to form different types of fins, which are combined with the TPMS to produce different effects.

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