Types of Convection
How Does Heat Transfer by Convection Occur
Equation
Natural convection is due to buoyancy and the buoyant force acting on the fluid. For natural convection to occur, there has to be a temperature difference across the fluid. Examples of natural convection include sea breeze and land breeze. Forced convection occurs when an external agent, like a fan or pump, transports the fluid. The effect is similar to natural convection. Examples of forced convection include a convection oven, air conditioner, car radiator, and water heater. Where Q: Heat transferred per unit time hc: Convective heat transfer coefficient TS: Temperature of the surface Tf: Temperature of the fluid The unit for the convective heat transfer coefficient is W⋅m−2⋅K−1 It depends on the physical properties of the surface and the fluid, like surface geometry, bulk fluid velocity, and the nature of fluid motion.
