TY - JOUR
T1 - Meso-scale modeling of the influence of intergranular gas bubbles on effective thermal conductivity
AU - Millett, Paul C.
AU - Tonks, Michael
N1 - Funding Information:
The authors gratefully acknowledge insightful conversations with Anter El-Azab, as well as financial support from the Nuclear Energy Modeling and Simulation (NEAMS) program within the US Department of Energy.
PY - 2011/5/31
Y1 - 2011/5/31
N2 - Using a meso-scale modeling approach, we have investigated how intergranular fission gas bubbles, as observed in high-burn-up nuclear fuel, modify the effective thermal conductivity in a polycrystalline material. The calculations reveal that intergranular porosity has a significantly higher resistance to heat transfer compared to randomly-distributed porosity. A model is developed to describe this conductivity reduction that considers an effective grain boundary Kapitza resistance as a function of the fractional coverage of grain boundaries by bubbles.
AB - Using a meso-scale modeling approach, we have investigated how intergranular fission gas bubbles, as observed in high-burn-up nuclear fuel, modify the effective thermal conductivity in a polycrystalline material. The calculations reveal that intergranular porosity has a significantly higher resistance to heat transfer compared to randomly-distributed porosity. A model is developed to describe this conductivity reduction that considers an effective grain boundary Kapitza resistance as a function of the fractional coverage of grain boundaries by bubbles.
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U2 - 10.1016/j.jnucmat.2011.02.040
DO - 10.1016/j.jnucmat.2011.02.040
M3 - Article
AN - SCOPUS:79955565515
SN - 0022-3115
VL - 412
SP - 281
EP - 286
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
IS - 3
ER -