Different Forms of Heat Transfer

For any method of heat transfer to take place, a temperature difference is nec­essary between two faces of a solid body, or at the boundaries of a gas or va­por. Hear transfer will take place only from a high-temperature source to a lower-temperature sink and is an irreversible process unless acted upon by an­other agency, as is the case with the refrigeration process.

Heat transfer may occur by one or more of three different modes:

• Conduction, which may be one-, two-, or three-dimensional or internally generated

• Convection, which may be natural or forced

• Radiation, which may be symmetrical or nonsymmetrical

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