8.1 Introduction
Our discussions of transport phenomena have shown that the quantity of information we can transport depends, in part upon the amount of surface through which this information can flow. Thus, the heat flow, q, is directly related to the surface area through which the heat flux, q″, passes. All our examples have focused on surfaces or interfaces having very simple geometrical configurations: spheres, cylinders, or plane walls. In most real situations, these simple surfaces do not provide enough surface area for efficient transport to occur. To enhance the transport, we alter the amount of surface by attaching protuberances such as fins or by corrugating the surface, or by making ...
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