Effects of intergranular gas bubbles on thermal conductivity

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

    Research output: Contribution to journalArticlepeer-review

    32 Scopus citations

    Abstract

    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
    Volume430
    Issue number1-3
    DOIs
    StatePublished - Nov 2012

    All Science Journal Classification (ASJC) codes

    • Nuclear and High Energy Physics
    • General Materials Science
    • Nuclear Energy and Engineering

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