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research-article

Deterministic Phonon Transport Predictions of Thermal Conductivity in Uranium Dioxide with Xenon Impurities

[+] Author and Article Information
Jackson R Harter

Nuclear Science and Engineering, Radiation Transport and Reactor Physics, Oregon State University
harterj@oregonstate.edu

Laura de Sousa Oliveira

Department of Mechanical Engineering, University of California - Riverside
laura.rita.oliveira@gmail.com

Agnieszka Truszkowska

School of Mechanical, Industrial & Manufacturing Engineering, Oregon State University
truszkoa@oregonstate.edu

Todd Palmer

Professor, Nuclear Science and Engineering, Oregon State University
palmerts@engr.orst.edu

P. Alex Greaney

Assistant Professor, Department of Mechanical Engineering, and Materials Science & Engineering Program, University of California - Riverside
agreaney@engr.ucr.edu

1Corresponding author.

ASME doi:10.1115/1.4038554 History: Received August 19, 2016; Revised October 18, 2017

Abstract

We present a method for solving the Boltzmann transport equation (BTE) for phonons by modifying the neutron transport code Rattlesnake which provides a numerically efficient method for solving the BTE in its Self-Adjoint Angular Flux form. Using this approach, we have computed the reduction in thermal conductivity of uranium dioxide (UO$_2$) due to the presence of a nanoscale xenon bubble across a range of temperatures. For these simulations, the values of group velocity and phonon mean free path in the UO$_2$ were determined from a combination of experimental heat conduction data and first principles calculations. The same properties for the Xe under the high pressure conditions in the nanoscale bubble were computed using classical molecular dynamics. We compare our approach to the other modern phonon transport calculations, and discuss the benefits of this multiscale approach for thermal conductivity in nuclear fuels under irradiation.

Copyright (c) 2017 by ASME
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