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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.
Heat pipes transfer heat by the evaporation and condensation of a working fluid. As stated above, a heat pipe is a vacuum. tight vessel which is evacuated and partially back-filled with a working fluid. As heat is input at the evaporator, fluid is. vaporized, creating a pressure gradient in the pipe.