Three dimensional calculations of the effective Kapitza resistance of UO2 grain boundaries containing intergranular bubbles

Paul C. Millett, Michael R. Tonks, K. Chockalingam, Yongfeng Zhang, S. B. Biner

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)117-122
Number of pages6
JournalJournal of Nuclear Materials
Issue number1-3
StatePublished - 2013

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

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