Study on phase-change heat transfer characteristics of anisotropic TPMS skeleton composite materials

doi:10.19799/j.cnki.2095-4239.2024.0554

Abstract

Abstract:

Phase-change materials (PCMs) are environmentally friendly energy storage materials extensively used in thermal storage. However, their thermal conductivity is poor, and metal skeletons are usually added to improve the thermal storage efficiency of PCMs. To explore the influence of the anisotropy of the skeleton on the phase-change process of porous medium-composite materials during thermal storage, the triply periodic minimal surface (TPMS) method with good biomimetic effect is used to establish the Gyroid skeleton and anisotropic Gyroid skeleton composite materials with PCMs. The anisotropic Gyroid skeletons in three directions and the Gyroid skeleton are compared. Based on the lattice Boltzmann method, the solid-liquid phase-change process of four operating conditions is studied at the pore scale. The results show that the anisotropic Gyroid skeleton in a specific orientation enhances the heat exchange capacity of PCMs more than the Gyroid skeleton. It improves the thermal conductivity of the framework and has a smaller inhibitory effect on the natural convection within the cavity. The melting time of operating condition 2 of the anisotropic Gyroid skeleton is 14% shorter than that of the Gyroid skeleton. The temperature increase rate within the cavity is faster. At Fo=0.06, the area above the phase-change termination temperature at the cut line is approximately 16% more than that of the Gyroid skeleton, the inhibition effect on the fluid flow is smaller, and the peak velocity at the designated cut line is 13.5% higher than that of the Gyroid skeleton. The anisotropic Gyroid skeleton composite material constructed in this study enhances the heat storage rate of composite PCMs without changing the porosity, providing a theoretical basis for designing the TPMS skeleton.

Key words: triply periodic minimal surface, solid-liquid phase change, lattice Boltzmann method, heat transfer, numerical simulation

CLC Number:

TK 124

Hongchen LI, Baoming CHEN, Pengzhen ZHU, Chonglong ZHONG, Chaofu MA. Study on phase-change heat transfer characteristics of anisotropic TPMS skeleton composite materials[J]. Energy Storage Science and Technology, 2024, 13(12): 4319-4329.

Figures/Tables 15

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工况	数学表达式
工况1	sin(ax)cos(by)+sin(by)cos(cz)+sin(cz)cos(ax)+c
工况2	sin(ax)cos(by)+sin(by)cos(cz)+sin(cz)cos(ax)sin(cz)+c
工况3	sin(ax)cos(by)+sin(by)cos(cz)sin(by)+sin(cz)cos(ax)+c
工况4	sin(ax)cos(by)sin(ax)+sin(by)cos(cz)+sin(cz)cos(ax)+c

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