A two-parameter nondiffusive heat conduction model for data analysis in pump-probe experiments
A two-parameter nondiffusive heat conduction model for data analysis in pump-probe experiments
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DOI：
10.1063/1.4904355
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发表时间：
2014-12-28
影响因子：
3.2
通讯作者：
Ma, Yanbao
中科院分区：
文献类型：
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作者：
Ma, Yanbao
由于非扩散热在基础物理和工程应用中的重要性，近50年来引起了广泛的研究兴趣。它具有傅里叶定律无法描述的独特特征。然而，目前对非扩散换热的研究仍主要集中在傅立叶定律框架内的有效导热系数的研究上，缺乏公认的替代方法。在这里，我们证明了非扩散热传导可以用两个固有的材料性质来表征：扩散热传导和弹道传输长度。我们还提出了一个双参数热传导模型，并在不同的热点尺寸相关的热传导实验中验证了该模型的有效性。该模型不仅为研究非扩散热传导问题提供了新的思路，而且为在傅立叶定律框架外研究非扩散热传导问题开辟了新的途径。(C)2014 AIP出版有限责任公司。
Nondiffusive heat transfer has attracted intensive research interests in last 50 years because of its importance in fundamental physics and engineering applications. It has unique features that cannot be described by the Fourier law. However, current studies of nondiffusive heat transfer still focus on studying the effective thermal conductivity within the framework of the Fourier law due to a lack of a well-accepted replacement. Here, we show that nondiffusive heat conduction can be characterized by two inherent material properties: a diffusive thermal conductivity and a ballistic transport length. We also present a two-parameter heat conduction model and demonstrate its validity in different hotspot-size-dependent heat transfer experiments. This model not only offers new insights of nondiffusive heat conduction but also opens up new avenues for the studies of nondiffusive heat transfer outside the framework of the Fourier law. (C) 2014 AIP Publishing LLC.