Answered: In our derivation for mass transfer…

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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Question

In our derivation for mass transfer outwards from a sphere with drug embedded in it, what was the condition (boundary condition) at the bondary of z = infinity? Concentration ANS:________?

Expert Solution

Step 1

In this case the drug is diffusing outwards and air is not diffusing inwards and hence is a case of diffusion of a component A through non-diffusing component B. A being the drug and B being the air. The concentration of the drug at the surface of the sphere is denoted by C_A. W is the constant molar rate of mass transfer and R is the radius of the sphere. The diffusivity of A through B is denoted by D_AB. The equation of the process is:

Step 2

The boundary conditions to solve the equation (1) are:

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