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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.
To accomplish this, there are three primary modes of heat transfer. 1  Some forms of transfer can be duplicated using multiple methods (both natural and forced), but every cooling system uses these same basic processes: 2  Conduction - the transfer of heat through matter with no net displacement of the matter. Convection - the circulatory motion of a gas or liquid caused by the variation of its density and the action of gravity.