Transport Phenomena Fundamentals, 4th Edition

4

One-Dimensional, Steady-State, Diffusive Transport

4.1 Introduction

In previous chapters we dealt with background information. Beginning here we enter into the main subject of study; the rate of transport processes. We will be considering the simplest form of transport first; the one-dimensional, steady-state, diffusive process. Fortunately, many aspects of transport processes can be understood using one-dimensional systems. Our starting point is the general balance equation or conservation law:

In−Out+Gen=Acc

(4.1)

This equation applies to a predetermined system of interest and accounts for all mechanisms that might produce ...