Effective thermal conductivity model of porous polycrystalline UO2: A computational approach

被引：1
|
作者：
Yoon, Bohyun [1 ]
Chang, Kunok [1 ]
机构：
[1] Kyung Hee Univ, Dept Nucl Engn, Yongin, South Korea
来源：
NUCLEAR ENGINEERING AND TECHNOLOGY | 2022年 / 54卷 / 05期
基金：
新加坡国家研究基金会;
关键词：
UO2; Effective thermal conductivity; Computer simulation; GRAIN-GROWTH; COMPUTER-SIMULATION; FISSION-GAS; RESISTANCE; DYNAMICS; BUBBLES;
D O I：
10.1016/j.net.2021.10.040
中图分类号：
TL [原子能技术]; O571 [原子核物理学];
学科分类号：
0827 ; 082701 ;
摘要：
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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页码：1541 / 1548
页数：8
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