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arXiv 1809.09277physics.app-ph
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考虑近场热辐射效应的接触热阻重新估算

Re-estimation of thermal contact resistance considering near-field thermal radiation effect

Yaoqi Xian, Ping Zhang, Siping Zhai, Peipei Yang, Zhiheng Zheng

摘要:

热接触一直是工程领域研究的热点问题,接触热阻是衡量界面间传热效率的重要指标之一。本文从理论上重新估计了共形粗糙表面的接触换热,同时考虑了接触区和非接触区的换热。采用涨落电动力学(从头计算)计算热辐射。接触区域的贡献估计的CMY TCR模型,并进一步研究通过建模特定的表面与相应的表面粗糙度功率谱(PSD)。几个测试中,铝和无定形氧化铝主要用于模拟。研究表明,在一定的有效粗糙度范围内,界面处的热传导与近场热辐射之间存在显著的协同作用。当有效粗糙度接近亚微米尺度时,即使在室温下,近场辐射效应也不能忽略。

英文摘要:

Thermal contact has always been a hot issue in many engineering fields and thermal contact resistance (TCR) is one of the important indicators weighing the heat transfer efficiency among the interfaces. In this paper, the contact heat transfer of conforming rough surfaces is theoretically re-estimated considering both the heat transfer from contact and non-contact regions. The fluctuational electrodynamics (an ab initio calculation) is adopted to calculate the thermal radiation. The contribution of contact regions is estimated by the CMY TCR model and further studied by modelling specific surfaces with corresponding surface roughness power spectrum (PSD). Several tests are presented where aluminum and amorphous alumina are mainly used in the simulations. Studies showed that there exists a significant synergy between the thermal conduction and near-field thermal radiation at the interface in a certain range of effective roughness. When the effective roughness is near to the scales of submicron, the near-field radiation effect should not be neglected even at room temperature.

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