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Effective thermal conductivity model of porous polycrystalline UO 2 : A computational approach

장근옥|윤보현
한국원자력학회 (Korean Nuclear Society)|2022.05|Nuclear Engineering and Technology|제54권 제5호|pp. 1541-1548|DOI https://doi.org/10.1016/j.net.2021.10.040

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키워드

Computer simulationUO2Effective thermal conductivity
주제분류원자력공학

초록

The thermal conductivity of uranium oxide (UO2) containing pores and grain boundaries is investigatedusing 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 theporous 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 simulationresults, a new empirical model is developed to predict the effective thermal conductivity of porouspolycrystalline UO2 fuel as a function of porosity and grain size

Abstract

The thermal conductivity of uranium oxide (UO2) containing pores and grain boundaries is investigatedusing 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 theporous 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 simulationresults, a new empirical model is developed to predict the effective thermal conductivity of porouspolycrystalline UO2 fuel as a function of porosity and grain size

참고문헌 (21)

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