Heat transfer is the process of energy exchange between two substances or systems due to a temperature difference. It occurs when there is a difference in thermal energy between two objects or regions, and the energy flows from the higher-temperature region to the lower-temperature region.
- : This is the heat transfer rate per unit area
- : This represents the wall shear stress
- : This is the local velocity of the fluid at the edge of the boundary layer
- : This is the Prandtl number
- : This is the enthalpy of the fluid at the edge of the boundary layer, which represents the total energy content of the fluid.
- : This is the enthalpy of the fluid at the wall surface