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

Paul C. Millett, Michael Tonks

Research output: Contribution to journalArticle

34 Citations (Scopus)

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
StatePublished - May 31 2011

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Thermal conductivity
Grain boundaries
thermal conductivity
bubbles
grain boundaries
Porosity
Gases
Kapitza resistance
porosity
Polycrystalline materials
nuclear fuels
Nuclear fuels
high resistance
gases
fission
heat transfer
Heat transfer
conductivity

All Science Journal Classification (ASJC) codes

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

Cite this

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Meso-scale modeling of the influence of intergranular gas bubbles on effective thermal conductivity. / Millett, Paul C.; Tonks, Michael.

In: Journal of Nuclear Materials, Vol. 412, No. 3, 31.05.2011, p. 281-286.

Research output: Contribution to journalArticle

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