SIMULTANEOUS VAPOR AND LIQUID DIFFUSION IN PARTIALLY WETTED POROUS MEDIA
作者:
W. Blumberg,
E.-U. Schlünder,
期刊:
Drying Technology
(Taylor Available online 1993)
卷期:
Volume 11,
issue 1
页码: 41-64
ISSN:0737-3937
年代: 1993
DOI:10.1080/07373939308916802
出版商: Taylor & Francis Group
关键词: homogeneous model;effective diffusivity;drying of mixtures
数据来源: Taylor
摘要:
In porous materials with pores containing both a gas and a liquid phase each a mixture of several components mass transfer by diffusion may occur simultaneously in both phases. An effective diffusivity is required in order to describe these effects when a homogeneous model is used. Unsteady-state diffusion experiments were performed such that a bed of glass beads partially saturated with glycerol was either loaded by passing wet air or dried by removing water or 2-propanol initially mixed to the glycerol. The effective diffusivity was obtained by applying the equation of unsteady-state diffusion to the observed change of mass. Superposition of the limiting cases of single-phase vapor and liquid diffusion in partially saturated systems yields a simple equation that describes the effective diffusivity as a function of pore saturation and correlates well with the measured values.
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