Heat Spreading
Thermal Interface Material Basics for Electronic Engineers
Clemens Lasance covers the basics of heat transfer to include conduction, convection, and resistance as well as the role of TIMs in Thermal Management. In addition, Lasance takes to task the terminology behind thermal impedance as shorthand for thermal resistance per unit area.
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Heat Spreading: Not a Trivial Problem
Heat spreading is essentially area enlarging: the larger the area, the more heat can be removed at the same temperature difference (subject to certain limits). Unfortunately, except for the simplest of cases, the equations describing heat spreading physics do not have an explicit mathematical solution. Hence, we have to rely on clever approximations or suitable computer codes. This article discusses the basics of heat spreading starting with the problematic definitions of thermal resistance and maximum allowable flux.
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