Answered: Finding the Effective Diffusivity De…

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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Finding the Effective Diffusivity De

Using typical values of D_AB , φ_p , σ_c ,and τ estimate the effective diffusivity, D_e.

Expert Solution

Step 1 The effective diffusivity is given as follows:

The term effective diffusivity is used in case of the diffusions and relations on a catalyst pellet. In the heterogeneous reaction system, the reaction occurs on the catalyst surface. Before the reaction, first, the mass transfer occurs from the bulk of the fluid to the external surface of the catalyst pellet. Followed by, the reactants are diffused through the pores within the pellets.

The effective diffusivity comes into account when there is mass transfer occurring from the bulk fluid to the external surface of the pellet.

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