A film condition definition consists of these components:
Unlike a heat flux, which directly prescribes a constant flow of heat into or out of a surface, film conditions determine the flow of heat due to convection effects and differences between the temperature of a surface and the temperature of its surroundings (that is, the reference temperature). If the surface is the same temperature as its surroundings, no heat flow occurs. The film coefficient is a property of a surface that determines how quickly it transfers heat with its surrounding; the higher the film coefficient, the higher the resulting heat flux is. | |||||||||