Meso-scale modeling of the influence of intergranular gas bubbles on effective thermal conductivity

Paul C. Millett, Michael Tonks

Research output: Contribution to journalArticle

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Abstract

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.

Original languageEnglish (US)
Pages (from-to)281-286
Number of pages6
JournalJournal of Nuclear Materials
Volume412
Issue number3
DOIs
Publication statusPublished - May 31 2011

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All Science Journal Classification (ASJC) codes

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

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