What Is Convection Heat Transfer. Convective heat transfer occurs when the surface temperature differs from that of surrounding fluid. The convective heat transfer coefficient h can be defined as.
The convective heat transfer coefficient h can be defined as. The atoms are in different types of motion at any time. Convective heat transfer has its wide horizon spreading from flow over a flat plate under constant heat flux or constant temperature boundary conditions to thermally.
In free convection air or water moves away from the heated body as the warm air or water rises and is replaced by a cooler parcel of air or water.
Heat convection occurs to the surface of an object where the surrounding fluid of object is heated and moved energy away from the source of heat. Convection only occurs in a moving liquid or a gas never in a solid. Although liquids and gases are generally not very good conductors of heat they can transfer heat quite rapidly by convection. As air is heated it expands as do all objects.