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arXiv 1710.09501cond-mat.mes-hall
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空气约束对纳米级传热中接触热阻的影响

Effect of air confinement on thermal contact resistance in nanoscale heat transfer

Dheeraj Pratap, Rakibul Islam, Patricia Al-Alam, Jaona Randrianalisoa, Nathalie Trannoy

摘要:

我们在此报告的压力依赖于Wollaston线热探头和样品之间的接触热阻(Rc)的分析模型的框架内进行评估。本文研究了在1 Pa ~ 10 e5 Pa的不同气压下,Wollaston丝热探针与纳米尺度样品之间的热传递。我们利用扫描热显微镜(SThM)的热分析两个样品,熔融石英(SiO2)和钛(Ti),具有不同的热导率。记录热探针的输出电压差(Δ V),该输出电压差在离接触输出电压(Voc)和接触输出电压(Vic)之间。结果表明,随着空气压力的增加,传热量增加,导热系数越高,传热量越大。我们还提出了一个分析模型的基础上归一化的输出电压差,以提取探针样品的接触热阻。在~1.8e7 K/W ~14.3e7 K/W范围内的Rc值验证了所提出的分析模型。进一步的分析表明,探针和样品之间的接触热阻随着空气压力的增加而减小。这种行为被解释为通过封闭空气的热传递对接触热阻的贡献。此外,在热失配行为的背景下,也证明了Rc的签名,这是通过使用声学失配模型(AMM)和扩散失配模型(DMM)的研究。

英文摘要:

We report herein the pressure dependent thermal contact resistance (Rc) between Wollaston wire thermal probe and samples which is evaluated within the framework of an analytical model. This work presents heat transfer between the Wollaston wire thermal probe and samples at nanoscale for different air pressure ranging from 1 Pa to 10e5 Pa. We make use of a scanning thermal microscopy (SThM) for the thermal analysis of two samples, fused silica (SiO2) and Titanium (Ti), with different thermal conductivities. The thermal probe's output voltage difference (deltaV) between out-off contact output voltage (Voc) and in-contact output voltage (Vic) was recorded. The result shows that the heat transfer increases with the increasing air pressure and it is found higher for higher thermal conductive material. We also propose an analytical model based on the normalized output voltage difference to extract the probe-sample thermal contact resistance. The obtained Rc values in the range of ~1.8e7 K/W to ~14.3e7 K/W validate the presented analytical model. Further analysis reveals that the thermal contact resistance between the probe and sample decreases with increasing air pressure. Such behavior is interpreted by the contribution of heat transfer through confined air on thermal contact resistance. In addition, the signature of Rc is also evidenced in the context of thermal mismatch behavior which is studied by using acoustic mismatch model (AMM) and diffuse mismatch model (DMM).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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