New Light on Some Old Problems:  Revisiting the Stefan Tube, Graham's Law, and the Bosanquet Equation

The Stefan diffusion tube is modeled with the recently developed binary friction model (BFM), and it is shown that this model can describe all kinds of vapor flow regimes from Stefan diffusion to pure pressure-driven flow but also Knudsen and (diffusive) slip flow. From the BFM simple criteria are d...

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Bibliographic Details
Published in:Industrial & engineering chemistry research 1997-03, Vol.36 (3), p.915-922
Main Author: Kerkhof, Piet J. A. M
Format: Article
Language:English
Subjects:
Applied sciences
Chemical engineering
Exact sciences and technology
Heat and mass transfer. Packings, plates
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Summary:The Stefan diffusion tube is modeled with the recently developed binary friction model (BFM), and it is shown that this model can describe all kinds of vapor flow regimes from Stefan diffusion to pure pressure-driven flow but also Knudsen and (diffusive) slip flow. From the BFM simple criteria are derived for the transition between various regions, the criteria of which are also relevant to the fields of gas adsorption, heterogeneous catalysis, and drying of porous materials. For isobaric counterdiffusion the BFM shows where the limits of Graham's law are. For equimolar counterdiffusion analogously the area of applicability of the Bosanquet equation is derived from the BFM and an extended equation is given.
ISSN:0888-5885
1520-5045
DOI:10.1021/ie960542i