|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Thermal Property Characterization, Modeling, and Theory in Extreme Environments
||Thermal Transport in Irradiated ThO2: A Combined Experimental and Phonon Level Investigation
||Anter El-Azab, Walter Deskins, Maniesha Singh, Sanjoy Mazumder, Kumagai Tomohisa, Jie Peng, Marat Khafizov, Zilong Hua, Lingfeng He, David Hurley
|On-Site Speaker (Planned)
We present a theory driven program for predicting thermal transport in irradiated ThO2, where computational models and experiments are combined to make progress. A Boltzmann Transport Equation (BTE) approach is used to model phonon transport and interactions at the mesoscale, with input consisting of phonon dispersion relations obtained by inelastic neutron scattering measurements and strain-based models for phonon scattering by lattice defects and microstructural features. Within a Monte Carlo (MC) solution scheme, point defects are represented as continuous fields that scatter phonons everywhere in the crystal while extended defects such as dislocation loops and voids are expressed as discrete strain sources that scatter phonons in a non-uniform fashion. MC simulations of phonon transport in irradiated ThO2 are compared with Modulated Thermoreflectance measurements of conductivity in the same material. This work is performed as part of the EFRC Center for Thermal Energy Transport under Irradiation.
||Nuclear Materials, Modeling and Simulation, Characterization