Prediction of thermal conductivity in dielectrics using fast, spectrally-resolved phonon transport simulations
- Oregon State Univ., Corvallis, OR (United States); Idaho National Lab. (INL), Idaho Falls, ID (United States)
- Univ. of California, Riverside, CA (United States)
- Oregon State Univ., Corvallis, OR (United States)
We present a new method for predicting effective thermal conductivity in materials, informed by ab initio material property simulations. Using the Boltzmann transport equation in a self-adjoint angular flux formulation, we performed simulations in silicon at room temperatures over length scales varying from 10 nm to 10 micron and report temperature distributions, spectral heat flux and thermal conductivity. Our implementation utilizes a Richardson iteration on a modified version of the phonon scattering source. In this method, a closure term is introduced to the transport equation which acts as a redistribution kernel for the total energy bath of the system. This term is an effective indicator of the degree of disorder between the spectral phonon radiance and the angular phonon intensity of the transport system. In conclusion, we employ polarization, density of states and full dispersion spectra to resolve thermal conductivity with numerous angular and spatial discretizations.
- Research Organization:
- Idaho National Lab. (INL), Idaho Falls, ID (United States)
- Sponsoring Organization:
- USDOE Office of Nuclear Energy (NE)
- Grant/Contract Number:
- AC07-05ID14517
- OSTI ID:
- 1647154
- Report Number(s):
- INL/JOU-20-58226-Rev000; TRN: US2202985
- Journal Information:
- International Journal of Heat and Mass Transfer, Vol. 144, Issue N/A; ISSN 0017-9310
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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