skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Effects of Intergranular Gas Bubbles on Thermal Conductivity

Abstract

Model microstructures obtained from phase-field simulations are used to study the effective heat transfer across bicrys- tals 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 effec- tive 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.

Authors:
; ;
Publication Date:
Research Org.:
Idaho National Laboratory (INL)
Sponsoring Org.:
DOE - NE
OSTI Identifier:
1061015
Report Number(s):
INL/JOU-12-24679
Journal ID: ISSN 0022-3115
DOE Contract Number:  
DE-AC07-05ID14517
Resource Type:
Journal Article
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 430; Journal Issue: 1 - 3; Journal ID: ISSN 0022-3115
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; thermal conductivity

Citation Formats

K. Chockalingam, Paul C. Millett, and M. R. Tonks. Effects of Intergranular Gas Bubbles on Thermal Conductivity. United States: N. p., 2012. Web. doi:10.1016/j.jnucmat.2012.06.027.
K. Chockalingam, Paul C. Millett, & M. R. Tonks. Effects of Intergranular Gas Bubbles on Thermal Conductivity. United States. doi:10.1016/j.jnucmat.2012.06.027.
K. Chockalingam, Paul C. Millett, and M. R. Tonks. Thu . "Effects of Intergranular Gas Bubbles on Thermal Conductivity". United States. doi:10.1016/j.jnucmat.2012.06.027.
@article{osti_1061015,
title = {Effects of Intergranular Gas Bubbles on Thermal Conductivity},
author = {K. Chockalingam and Paul C. Millett and M. R. Tonks},
abstractNote = {Model microstructures obtained from phase-field simulations are used to study the effective heat transfer across bicrys- tals 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 effec- tive 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.},
doi = {10.1016/j.jnucmat.2012.06.027},
journal = {Journal of Nuclear Materials},
issn = {0022-3115},
number = 1 - 3,
volume = 430,
place = {United States},
year = {2012},
month = {11}
}