13. (a) What are the three main mechanisms of Diffusion in mass transfer processes? (b) Why is the effective diffusivity in porous solids less than it would be in free liquid? (c) Give a simple laboratory experiment that could be used to illustrate the following processes:
13. (a) What are the three main mechanisms of Diffusion in mass transfer processes? (b) Why is the effective diffusivity in porous solids less than it would be in free liquid? (c) Give a simple laboratory experiment that could be used to illustrate the following processes:
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:13.
What are the three main mechanisms of
(a)
Diffusion in mass transfer processes?
(b)
Why is the effective diffusivity in porous solids
less than it would be in free liquid?
(c)
Give a simple laboratory experiment that could
be used to illustrate the following processes:
() Steady state molecular
diffusion
(ii) Unsteady state molecular diffusion
(d)
Fick's Law for mass transfer by molecular
diffusion can be expressed as
Define each of the terms in the above equation,
stating typical units, and explain the significance of
the negative sign.
How is Fick's law modified to apply in the
(e)
following situations
() Eddy Diffusion
(ii) Diffusion through a porous solid
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