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Citation link: https://doi.org/10.26092/elib/2454

Publisher DOI: https://doi.org/10.1002/aic.14711
T. Veltzke, L. Kiewidt. J. Thöming, Multicomponent gas diffusion in nonuniform tubes_2015 accepted version.pdf
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Multicomponent gas diffusion in nonuniform tubes


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T. Veltzke, L. Kiewidt. J. Thöming, Multicomponent gas diffusion in nonuniform tubes_2015 accepted version.pdf580.33 kBAdobe PDFView/Open
Authors: Veltzke, Thomas 
Kiewidt, Lars  
Thöming, Jorg  
Abstract: 
In many technical processes gas, multicomponent diffusion takes place in confinements that are rarely uniform in direction of their long axis (e.g., catalysts pores). Here, we show that in conical tubes multicomponent diffusion is hindered. This effect increases with ratio of inlet to outlet cone radius Λ, indifferent of the orientation of the tube. Based on the Maxwell–Stefan equations, predictive analytical solution for ideal multicomponent diffusion in slightly tapered ducts is developed. In two-bulb diffusion experiments on a uniform tube, the results of Duncan and Toor (1962) were reproduced. Comparison of model and experiment shows that the solution presented here provides a reliable quantitative prediction of the temporal change of H2, N2, and CO2-concentration for both tube geometries, uniform and slightly conical. In the demonstrated case (Λ = 3.16), mass diffusion is 68% delayed. Thus, for gaseous diffusion in “real,” typically tapered pores the transport limitation is more serious than considered so far. © 2014 American Institute of Chemical Engineers AIChE J, 61: 1404–1412, 2015
Keywords: gas multicomponent diffusion; experiments on conical tubes; classical Maxwell–Stefan equations; analytical transport model; two-bulb diffusion experiment; Mimenima
Issue Date: 12-Dec-2014
Publisher: Wiley
Project: MIMENIMA GRK 1860 
Funders: Deutsche Forschungsgemeinschaft
Grant number: 601090
Journal/Edited collection: AIChE Journal 
Issue: 4
Start page: 1404
End page: 1412
Volume: 61
Pages: 9
Type: Artikel/Aufsatz
ISSN: 00011541
Secondary publication: yes
Document version: Postprint
DOI: 10.26092/elib/2454
URN: urn:nbn:de:gbv:46-elib71339
Institution: Universität Bremen 
Faculty: Zentrale Wissenschaftliche Einrichtungen und Kooperationen 
Institute: Zentrum für Umweltforschung und nachhaltige Technologien (UFT) 
Appears in Collections:Forschungsdokumente

  

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