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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