A multi-block lattice Boltzmann method for the thermal contact resistance at the interface of two solids
A multi-block lattice Boltzmann method for the thermal contact resistance at the interface of two solids
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DOI：
10.1016/j.applthermaleng.2018.03.095
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发表时间：
2018-06
影响因子：
6.4
通讯作者：
Wen-Zhen Fang;J. Gou;Li Chen;W. Tao
中科院分区：
文献类型：
--
作者：
Wen-Zhen Fang;J. Gou;Li Chen;W. Tao
本文采用补片式多块晶格玻尔兹曼方法预测两固体界面处的接触热阻（TCR）。基于分形理论重构了接触材料的粗糙表面，并基于塑性变形模型获得了接触压力。通过一些基准测试验证了补片式多块晶格玻尔兹曼方法的准确性。验证后，研究了接触压力、粗糙度、接触材料导热系数、间隙介质导热系数、温度和辐射对TCR的影响。结果表明：TCR随接触压力的增大而减小，随均方根粗糙度的增大而增大；随着接触压力的增加，两触点铝的TCR比不锈钢降低得更快；接触材料的高导热性导致较小的TCR；当间隙介质的导热系数接近于零或间隙处于真空状态时，TCR远大于充满空气时的TCR，特别是在接触压力较低时；在高温下，如果间隙介质的导热系数较低，则辐射对TCR的贡献变得明显。特别是当间隙处于真空状态时，辐射对TCR的贡献是不可忽视的。
In the present paper, a patching type multi-block lattice Boltzmann method is adopted to predict the thermal contact resistance (TCR) at the interface of two solids. The rough surfaces of contact materials are reconstructed based on the fractal theory and the contact pressure is obtained based on the plastic deformation model. The accuracy of the patching type multi-block lattice Boltzmann method is validated by some benchmarks. After validations, effects of the contact pressure, roughness, thermal conductivity of contact material, thermal conductivity of interstitial medium, temperature and radiation on TCR are investigated. The results show that: the TCR decreases when the contact pressure increases, but increases with the root-mean-square roughness; the TCR of two contact aluminums decreases faster than that of stainless steels when contact pressure increases; a higher thermal conductivity of contact materials leads to a smaller TCR; when the thermal conductivity of interstitial medium is close to zero or the gap is in vacuum, the TCR is much larger than that filled with air, especially at low contact pressure; at the high temperature, the contribution of the radiation to the TCR becomes appreciable if the thermal conductivity of the interstitial medium is low. Especially when the gap is in vacuum, the contribution of radiation on the TCR cannot be neglected.