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Convective heat transfer, often referred to simply as convection, is the transfer of heat from one place to another by the movement of fluids. Convection is usually the dominant form of heat transfer in liquids and gases. Although often discussed as a distinct method of heat transfer, convective heat transfer involves the combined processes of unknown conduction and advection.
The transfer is characterized by the quantity of energy transferred, which can be specified in energy units such as the joule (J), in combination with the direction of the transfer, which can be specified as in (to) or out of (from) one system or the other.ther constructions include energy transferred as heat, energy transferred by heat, or energy transferred by a process called heating rather than heat. Terminology for mass transfer is less problematic because it can be used in the same ways as the word transfer itself.