Examples of solid bodies that can be treated as semi-infinite mediums for the purpose of transient heat transfer studies?
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A semi-infinite solid is an idealized body that has a single plane surface and extends to infinity in all directions . This idealized body is used to indicate that the temperature change in the part of the body in which we are interested (the region close to the surface) is due to the thermal conditions on a single surface. The earth, for example, can be considered to be a semi-infinite medium in determining the variation of temperature near its surface. Also, a thick wall can be modeled as a semi-infinite medium if all we are interested in is the variation of temperature in the region near one of the surfaces, and the other surface is too far to have any impact on the region of interest during the time of observation.
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