Quasiballistic Heat Conduction in Transient Grating Spectroscopy
- Creators
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Hua, Chengyun
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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
License: Attribution 3.0 Unported (CC BY 3.0). The authors would like to 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 Grant no. CBET 1254213, and by Boeing under the Boeing-Caltech Strategic Research & Development Relationship Agreement.Attached Files
Submitted - 1402.1449.pdf
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Additional details
- Eprint ID
- 106326
- Resolver ID
- CaltechAUTHORS:20201028-102723795
- Bosch Energy Research Network
- 13.01.CC11
- NSF
- CBET-1254213
- Boeing-Caltech Strategic Research & Development Relationship Agreement
- Created
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2020-10-29Created from EPrint's datestamp field
- Updated
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2023-06-02Created from EPrint's last_modified field