Determining the Kapitza resistance and the thermal conductivity of polycrystals: A simple model
Determining the Kapitza resistance and the thermal conductivity of polycrystals: A simple model
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DOI：
10.1103/physrevb.57.8264
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发表时间：
1998-04-01
影响因子：
3.7
通讯作者：
Birringer, R
中科院分区：
文献类型：
--
作者：
Nan, CW;Birringer, R
本文将Kapitza电阻的概念与有效介质方法相结合，提出了一个简单的多晶体导热系数模型。通过将该模型应用于文献中报道的几种热电合金，我们表明，它很好地描述了经常观察到的晶粒尺寸依赖的多晶体的热导率，也提供了一个简单而实用的方法来确定Kapitza电阻。我们估计的Kapitza电阻在真实的多晶体和微观结构尺度的影响，如晶粒尺寸和晶粒形状的空间变化，对热导率。
A simple model for the thermal conductivity of polycrystals is presented by incorporating the concept of the Kapitza resistance with an effective medium approach. By applying this model to a few thermoelectric alloys reported in the literature, we show that it quite well describes the often observed grain size-dependent thermal conductivity of polycrystals and also provides a simple and practical method to determine the Kapitza resistance. We estimate the Kapitza resistance in real polycrystals and the effects of microstructural scales, such as spatial variations in the grain size and grain shapes, on the thermal conductivity.