9.1 Introduction

In the previous chapters we have wandered through the general balance equation:

In  Out + Gen = Acc

and highlighted the effects of adding each subsequent term. We have focused on one-dimensional problems to illustrate the properties of the equations and solutions. There are many instances though, when a one-dimensional formulation cannot represent the physical situation accurately.

Consider the classic fin problem introduced in Chapter 8 and shown in Figure 9.1. To perform the fin analysis, we assumed the fin was thin so that at any point along its length, ...

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