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Details for article 8 of 13 found articles
| Title: |
LAG TIME AND STEADY-STATE PERMEABILITY FOR A DIFFUSION SYSTEM WITH SERIAL AND/OR PARALLEL PATHS |
| Author: |
Chen†, Jenn-Shing Rosenberger, Franz |
| Appeared in: |
Chemical engineering communications |
| Paging: | Volume 99 (1991) nr. 1 pages 77-87 |
| Year: |
1991 |
| Contents: |
A diffusion system is considered in which transport occurs along two parallel paths which, in turn, are in series with another path. Relations for the steady-state permeability and lag time are obtained in terms of the cross-sectional areas and lengths of diffusion, diffusivities and interfacial partition coefficients. The relations are derived from the slope and intercept (on the time axis) of the linear asymptote for the total amount of diffusant released into the receiver. The asymptote is calculated by repeated integration rather than a complete solution to the coupled diffusion equations. Equivalence relations are given for the transformation of the parallel paths into a single path, thus allowing for a treatment of the whole system in the form of two homogeneous paths in series. These equivalence relations include an effective partition coefficient as an average of its component's partition coefficient weighted by the corresponding fraction of cross-sectional area, and an effective diffusivity as an average of individual diffusivities weighted by the corresponding fraction of the product of cross-sectional area and partition coefficient. |
| Publisher: |
Taylor & Francis |
| Source file: |
Elektronische Wetenschappelijke Tijdschriften |
Details for article 8 of 13 found articles
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