TY - JOUR
T1 - Three dimensional calculations of the effective Kapitza resistance of UO2 grain boundaries containing intergranular bubbles
AU - Millett, Paul C.
AU - Tonks, Michael R.
AU - Chockalingam, K.
AU - Zhang, Yongfeng
AU - Biner, S. B.
N1 - Funding Information:
The authors gratefully acknowledge financial support from the Nuclear Energy Modeling and Simulation (NEAMS) program within the US Department of Energy.
PY - 2013
Y1 - 2013
N2 - A parametric study has been performed that quantifies the effective change in grain boundary Kapitza resistance due to the presence of intergranular bubbles. The steady-state heat conduction equation was solved in three-dimensional space using INL's MOOSE finite element software, with which spacial mesh adaptivity was used to resolve interfacial widths down to several nanometers while investigating bubble sizes up to a micrometer. Three critical parameters were systematically varied: the intergranular bubble radius, the fractional grain boundary bubble coverage, and the Kapitza resistance of the intact grain boundary. Using the simulation results, a mathematical model dependent on each of these parameters was developed to describe the effective Kapitza resistance. Furthermore, we illustrate how this model can be implemented in a fuel performance code to predict the temperature profile of a cylindrical fuel pellet.
AB - A parametric study has been performed that quantifies the effective change in grain boundary Kapitza resistance due to the presence of intergranular bubbles. The steady-state heat conduction equation was solved in three-dimensional space using INL's MOOSE finite element software, with which spacial mesh adaptivity was used to resolve interfacial widths down to several nanometers while investigating bubble sizes up to a micrometer. Three critical parameters were systematically varied: the intergranular bubble radius, the fractional grain boundary bubble coverage, and the Kapitza resistance of the intact grain boundary. Using the simulation results, a mathematical model dependent on each of these parameters was developed to describe the effective Kapitza resistance. Furthermore, we illustrate how this model can be implemented in a fuel performance code to predict the temperature profile of a cylindrical fuel pellet.
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U2 - 10.1016/j.jnucmat.2013.02.039
DO - 10.1016/j.jnucmat.2013.02.039
M3 - Article
AN - SCOPUS:84877075723
SN - 0022-3115
VL - 439
SP - 117
EP - 122
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
IS - 1-3
ER -