Transport regimes in quasiballistic heat conduction

被引：82

作者：

Hua, Chengyun ^{[1
]}

Minnich, Austin J. ^{[1
]}

机构：

[1] CALTECH, Div Engn & Appl Sci, Pasadena, CA 91125 USA

来源：

PHYSICAL REVIEW B | 2014年 / 89卷 / 09期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevB.89.094302

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Transient grating (TG) spectroscopy is an important experimental technique to measure mean-free-path (MFP) spectra using observations of quasiballistic heat conduction. To obtain MFP spectra, the measurements must be interpreted within the framework of the frequency-dependent Boltzmann transport equation (BTE), but previous solutions have restricted validity due to simplifying assumptions. Here we analyze heat conduction in TG using a new analytical solution of the frequency-dependent BTE that accurately describes thermal transport from the diffusive to ballistic regimes. We demonstrate that our result enables a more accurate measurement of MFP spectra and thus will lead to an improved understanding of heat conduction in solids.

引用

页数：5

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