Effects of intergranular gas bubbles on thermal conductivity

K. Chockalingam, Paul C. Millett, M. R. Tonks

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


Model microstructures obtained from phase-field simulations are used to study the effective heat transfer across bicrystals with stationary grain boundary bubble populations. We find that the grain boundary coverage, irrespective of the intergranular bubble radii, is the most relevant parameter to the thermal resistance, which we use to derive effective Kapitza resistances that are dependent on the grain boundary coverage and Kaptiza resistance of the intact grain boundary. We propose a model to predict thermal conductivity as a function of porosity, grain-size, Kaptiza resistance of the intact grain boundary, and grain boundary bubble coverage.

Original languageEnglish (US)
Pages (from-to)166-170
Number of pages5
JournalJournal of Nuclear Materials
Issue number1-3
StatePublished - Nov 2012

All Science Journal Classification (ASJC) codes

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


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