Transport regimes in quasiballistic heat conduction
- Creators
- Hua, Chengyun
-
Minnich, Austin J.
Abstract
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.
Additional Information
© 2014 American Physical Society. Published 14 March 2014; Received 9 September 2013. The authors thank Kimberlee Collins and Gang Chen for useful discussions and for providing the PbSe data. This work was sponsored in part by Robert Bosch LLC through Bosch Energy Research Network Grant No. 13.01.CC11, by the National Science Foundation under Career Grant No. CBET 1254213, and by Boeing under the Boeing-Caltech Strategic Research & Development Relationship Agreement.Attached Files
Published - PhysRevB.89.094302.pdf
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Additional details
- Eprint ID
- 44885
- Resolver ID
- CaltechAUTHORS:20140411-093446830
- Bosch Energy Research Network
- 13.01.CC11
- NSF
- CBET 1254213
- Boeing-Caltech Strategic Research & Development Relationship Agreement
- Created
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2014-04-11Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field