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

Paul C. Millett; Michael Tonks

doi:10.1016/j.jnucmat.2011.02.040

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

Paul C. Millett, Michael Tonks

Materials Research Institute (MRI)

Research output: Contribution to journal › Article › peer-review

49 Scopus citations

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 language	English (US)
Pages (from-to)	281-286
Number of pages	6
Journal	Journal of Nuclear Materials
Volume	412
Issue number	3
DOIs	https://doi.org/10.1016/j.jnucmat.2011.02.040
State	Published - May 31 2011

All Science Journal Classification (ASJC) codes

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

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10.1016/j.jnucmat.2011.02.040

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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.",

author = "Millett, {Paul C.} and Michael Tonks",

note = "Funding Information: The authors gratefully acknowledge insightful conversations with Anter El-Azab, as well as financial support from the Nuclear Energy Modeling and Simulation (NEAMS) program within the US Department of Energy. ",

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AU - Tonks, Michael

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AB - 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.

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

Abstract

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