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Title: Effective gaseous diffusion coefficients of select ultra-fine, super-fine and medium grain nuclear graphite

Abstract

Understanding “Where?” and “How much?” oxidation has occurred in a nuclear graphite component is critical to predicting any deleterious effects to physical, mechanical, and thermal properties. A key factor in answering these questions is characterizing the effective mass transport rates of gas species in nuclear graphites. Effective gas diffusion coefficients were determined for twenty-six graphite specimens spanning six modern grades of nuclear graphite. A correlation was established for the majority of grades examined allowing a reasonable estimate of the effective diffusion coefficient to be determined purely from an estimate of total porosity. The importance of Knudsen diffusion to the measured diffusion coefficients is also shown for modern grades. Furthermore, Knudsen diffusion has not historically been considered to contribute to measured diffusion coefficients of nuclear graphite.

Authors:
 [1];  [1];  [1]; ORCiD logo [2];  [1];  [1]
  1. Idaho National Lab. (INL), Idaho Falls, ID (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1437894
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Carbon
Additional Journal Information:
Journal Volume: 136; Journal Issue: C; Journal ID: ISSN 0008-6223
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Kane, Joshua J., Matthews, Austin C., Orme, Christopher J., Contescu, Cristian I., Swank, W. David, and Windes, William E.. Effective gaseous diffusion coefficients of select ultra-fine, super-fine and medium grain nuclear graphite. United States: N. p., 2018. Web. doi:10.1016/j.carbon.2018.05.003.
Kane, Joshua J., Matthews, Austin C., Orme, Christopher J., Contescu, Cristian I., Swank, W. David, & Windes, William E.. Effective gaseous diffusion coefficients of select ultra-fine, super-fine and medium grain nuclear graphite. United States. doi:10.1016/j.carbon.2018.05.003.
Kane, Joshua J., Matthews, Austin C., Orme, Christopher J., Contescu, Cristian I., Swank, W. David, and Windes, William E.. Sat . "Effective gaseous diffusion coefficients of select ultra-fine, super-fine and medium grain nuclear graphite". United States. doi:10.1016/j.carbon.2018.05.003.
@article{osti_1437894,
title = {Effective gaseous diffusion coefficients of select ultra-fine, super-fine and medium grain nuclear graphite},
author = {Kane, Joshua J. and Matthews, Austin C. and Orme, Christopher J. and Contescu, Cristian I. and Swank, W. David and Windes, William E.},
abstractNote = {Understanding “Where?” and “How much?” oxidation has occurred in a nuclear graphite component is critical to predicting any deleterious effects to physical, mechanical, and thermal properties. A key factor in answering these questions is characterizing the effective mass transport rates of gas species in nuclear graphites. Effective gas diffusion coefficients were determined for twenty-six graphite specimens spanning six modern grades of nuclear graphite. A correlation was established for the majority of grades examined allowing a reasonable estimate of the effective diffusion coefficient to be determined purely from an estimate of total porosity. The importance of Knudsen diffusion to the measured diffusion coefficients is also shown for modern grades. Furthermore, Knudsen diffusion has not historically been considered to contribute to measured diffusion coefficients of nuclear graphite.},
doi = {10.1016/j.carbon.2018.05.003},
journal = {Carbon},
number = C,
volume = 136,
place = {United States},
year = {Sat May 05 00:00:00 EDT 2018},
month = {Sat May 05 00:00:00 EDT 2018}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on May 5, 2019
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