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

Kane, Joshua J.; Matthews, Austin C.; Orme, Christopher J.; Contescu, Cristian I.; Swank, W. David; Windes, William E.

doi:10.1016/j.carbon.2018.05.003

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

Journal Article · Sat May 05 00:00:00 EDT 2018 · Carbon

DOI: https://doi.org/10.1016/j.carbon.2018.05.003 · OSTI ID:1437894

Kane, Joshua J. ^[1]; Matthews, Austin C. ^[1]; Orme, Christopher J. ^[1];

^[2]; Swank, W. David ^[1]; Windes, William E. ^[1]

Idaho National Lab. (INL), Idaho Falls, ID (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1437894

Journal Information:: Carbon, Journal Name: Carbon Journal Issue: C Vol. 136; ISSN 0008-6223

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Diffusion in Porous Media: Phenomena and Mechanisms Tartakovsky, Daniel M.; Dentz, Marco Transport in Porous Media, Vol. 130, Issue 1 https://doi.org/10.1007/s11242-019-01262-6	journal	March 2019
Investigation on the oxidation behavior and multi-step reaction mechanism of nuclear graphite SNG742 Lu, Wei; Li, Xiaowei; Wu, Xinxin Journal of Nuclear Science and Technology, Vol. 57, Issue 3 https://doi.org/10.1080/00223131.2019.1671910	journal	September 2019

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