| Download | - View final version: The effect of relative humidity on binary gas diffusion (PDF, 582 KiB)
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| DOI | Resolve DOI: https://doi.org/10.1021/jp900796w |
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| Author | Search for: Astrath, Nelson1; Search for: Shen, Jun1; Search for: Song, Datong1; Search for: Rohling, Jurandir H.1; Search for: Astrath, Francine B. G.1; Search for: Zhou, Jianqin1; Search for: Navessin, Titichai1; Search for: Liu, Zhong Sheng (Simon)1; Search for: Gu, Caikang1; Search for: Zhao, Xinsheng1 |
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| Affiliation | - National Research Council of Canada. NRC Institute for Fuel Cell Innovation
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| Format | Text, Article |
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| Subject | Gas; diffusion cell; Fuller-Schettler-Giddings (FSG); FSG empirical equation |
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| Abstract | The dependence of diffusion coefficient of O2-N2 mixture in the presence of water vapor was experimentally determined as a function of relative humidity (RH) with different temperatures using an in-house made Loschmidt diffusion cell. The experimental results showed that O2-N2 diffusion coefficient increased more than 17% when RH increased from 0% to 80% at 79 °C. In the experiments, the RH in both top and bottom chambers of the diffusion cell were the same, and the pressure inside the diffusion cell was kept as ambient pressure (1 atm.). Maxwell-Stefan theory was employed to analyze the mass transport in the diffusion cell, and found that there was no effective water vapor diffusion taking place, indicating that the gas diffusion in this ternary (O2-N2-water vapor) system could be considered binary gas (O2-N2) diffusion. The Fuller, Schettler, and Giddings (FSG) empirical equation of the kinetic theory of gases was generalized to accommodate the dependence of the binary diffusion coefficient on the RH. The prediction of the generalized equation was found to be consistent with experimental results with the difference of less than 1.5%, showing that the generalized equation could be applied to calculate the diffusion coefficients of the binary gaseous mixture with different temperature and RH values. The effect of water vapor on the increase of O2-N2 diffusion coefficient was discussed using molecule theory. |
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| Publication date | 2009-05-24 |
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| Terms of use | - The material in this document is covered by the provisions of the Copyright Act, by Canadian laws, policies, regulations and international agreements. Such provisions serve to identify the information source and, in specific instances, to prohibit reproduction of materials without written permission
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| Language | English |
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| Peer reviewed | Yes |
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| NPARC number | 9126873 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | c82cc270-0694-46d0-9815-705a373864f0 |
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| Record created | 2009-10-02 |
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| Record modified | 2020-05-27 |
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