基于多块格子Boltzmann方法模拟接触热阻

Numerical Predictions of Thermal Contact Resistance Based on the Multi-block Lattice Boltzmann Method

本文基于OpenMP并行语言,采用拼接式的多块格子Boltzmann方法研究了接触压力、粗糙度、间隙介质导热系数对接触热阻的影响规律。结果表明:铝之间的接触热阻随着接触压力的增加而降低,随着粗糙度的增加而增加;当块体气凝胶之间的间隙填充空气时,气凝胶之间的接触热阻随压力的增加变化不大;而当气凝胶间隙趋于真空时,接触热阻随压力的增大而降低;间隙介质的气体导热对于接触热阻起着关键的作用,在低接触压力时。气凝胶间隙趋于真空时的接触热阻是填充空气的大约50倍。

In the present paper,a patched-type multi-block lattice Boltzmann method is adopted to study the influences of contact pressure,roughness,gas thermal conductivity of interstice media on the thermal contact resistance.The results show that thermal contact resistance of aluminum pairs decreases with the increasing contact pressure,while increases with roughness.Besides,the thermal contact resistance of bulk aerogel pairs changes slightly with the increase of contact pressure when the interstices are filled with air,while significantly decreases if the interstice is approaching vacuum.In addition,the gas conduction of interstice media plays a key role on the thermal contact resistance.At low contact pressure,the thermal contact resistance of the vacuum gap is about 50 times of that of the air gap.