(b) Fick's Law for molecular diffusion is given as dCa JA = -DAB dz where Ja is a molar flux, DAB is a molecular diffusivity and dCA/dz is a change of concentration over distance. Molecular diffusion can occur in three phases which are liquid, solid and gas. Provide examples of diffusion in liquids for industrial separation process and in daily life nature situation and explain why rate of molecular diffusion in liquids is slower than in i. gases. ii. By using an appropriate example, explain the steady-state diffusion of A through non-diffusing B for molecular diffusion of gases.
(b) Fick's Law for molecular diffusion is given as dCa JA = -DAB dz where Ja is a molar flux, DAB is a molecular diffusivity and dCA/dz is a change of concentration over distance. Molecular diffusion can occur in three phases which are liquid, solid and gas. Provide examples of diffusion in liquids for industrial separation process and in daily life nature situation and explain why rate of molecular diffusion in liquids is slower than in i. gases. ii. By using an appropriate example, explain the steady-state diffusion of A through non-diffusing B for molecular diffusion of gases.
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:(b) Fick's Law for molecular diffusion is given as
dCA
JA = -DAB
dz
where Ja is a molar flux, DAB is a molecular diffusivity and dCA/dz is a change of concentration
over distance. Molecular diffusion can occur in three phases which are liquid, solid and gas.
i.
Provide examples of diffusion in liquids for industrial separation process and in daily life
nature situation and explain why rate of molecular diffusion in liquids is slower than in
gases.
ii.
By using an appropriate example, explain the steady-state diffusion of A through
non-diffusing B for molecular diffusion of gases.
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