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The Diffusive Mass Transfer in the Transition‐Region between Continuum and Molecular‐Motion
Author(s) -
Kast W.
Publication year - 2002
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/1521-4125(20020806)25:8<785::aid-ceat785>3.0.co;2-8
Subject(s) - knudsen number , mass transfer , chemistry , microporous material , knudsen diffusion , diffusion , thermodynamics , mechanics , chemical physics , physics , chromatography , organic chemistry
By experimental investigations of diffusion and permeation through microporous rock‐salt, the mass transfer as function of the pore‐diameter d p , resp. of the Knudsen‐number Kn = λ/d p was described with the scope to develop a complete function for the whole region from continuum Kn < 0.01 to the Knudsen‐region Kn > 1. The laws of mass tranfer in the continuum and for the molecular motion in the Knudsen‐region are known. But in between these two regions, i.e., the transition‐region, there are secondary effects which have to be taken into consideration by superimposition of the different mechanisms for mass transfer.