Journal
NUCLEAR ENGINEERING AND TECHNOLOGY
Volume 54, Issue 5, Pages 1541-1548Publisher
KOREAN NUCLEAR SOC
DOI: 10.1016/j.net.2021.10.040
Keywords
UO2; Effective thermal conductivity; Computer simulation
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Funding
- National Research Foundation of Korea (NRF) - Korean government (MSIT) [NRF-2017M2B2B1072806]
- Human Resources Program in Energy Technology of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) from the Ministry of Trade, Industry Energy, Republic of Korea [20214000000070]
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The thermal conductivity of uranium oxide (UO2) with pores and grain boundaries is investigated using simulations based on the finite-difference method. The study quantifies the effects of porosity, pore size, and grain size on the thermal conductivity of UO2. A new empirical model is developed to predict the thermal conductivity of porous polycrystalline UO2 fuel.
The thermal conductivity of uranium oxide (UO2) containing pores and grain boundaries is investigated using continuum-level simulations based on the finite-difference method in two and three dimensions. Steady-state heat conduction is solved on microstructures generated from the phase-field model of the porous polycrystal to calculate the effective thermal conductivity of the domain. The effects of porosity, pore size, and grain size on the effective thermal conductivity of UO2 are quantified. Using simulation results, a new empirical model is developed to predict the effective thermal conductivity of porous polycrystalline UO2 fuel as a function of porosity and grain size. (C) 2021 Korean Nuclear Society, Published by Elsevier Korea LLC.
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