Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1565619 | Journal of Nuclear Materials | 2013 | 6 Pages |
Abstract
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.
Related Topics
Physical Sciences and Engineering
Energy
Nuclear Energy and Engineering
Authors
Paul C. Millett, Michael R. Tonks, K. Chockalingam, Yongfeng Zhang, S.B. Biner,