MOLECULAR DIFFUSION OF VOLATILE-LIQUID VAPORS INTO AIR |
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Authors: | K. C. Kwon Yoonkook Park C. M. Simmons G. L. Tibere T. H. Ibrahim |
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Affiliation: | a Department of Chemical Engineering, Tuskegee University, Tuskegee, Alabama, USA.b Chemical Engineering Department, American University of Sharjah, Sharjah, UAE. |
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Abstract: | Diffusion coefficients of vapors diffused into stagnant air were determined at room temperature and atmospheric pressure. Experimental data on diffusion coefficients were obtained from the steady-state open-tube evaporation method modified for this study. No fresh air is passed over the top end of a diffusion tube, and amounts of volatile liquids evaporated in the diffusion tube are measured with a balance rather than a change of the liquid level in a diffusion tube. Experimental molecular diffusion coefficients are obtained by applying experimental data of mass losses of volatile liquidsversusevaporation durations to a diffusion equation developed suitable for the novel open-tube evaporation method. Three main experimental errors of the novel open-tube evaporation method are described in detail. Predicted diffusion coefficients are calculated with the Wilke-Lee method and compared with experimental values obtained from this diffusion study. |
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Keywords: | Molecular Diffusion Coefficient Diffusion Equation Open-tube Evaporation Method Experimental Errors |
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