and plz list your name/email so i can list you as a resource 4 my sci. paper
There are 3 modes of heat transfer: Conduction - When you touch a hot pan heat transfers directly from the pan into your skin burning it. Radiation - When your driving down the road with the windows rolled up and the sun shining through the window makes your arm hot. Convection - Convection is when air is heated by conduction then the hot air moves by natural currents or by force currents with a fan and the heat is lost when it conducts heat into another object.
Convection involves the transfer of heat by the motion and mixing of macroscopic portions of a fluid (that is, the flow of a fluid past a solid boundary). The term natural convection is used if this motion and mixing is caused by density variations resulting from temperature differences within the fluid. The term forced convection is used if this motion and mixing is caused by an outside force,such as a pump. The transfer of heat from a hot water radiator to a room is an exampe of heat transfer by natural convection. The tansfer of heat from the surface of a heat exchanger to the bulk of a fluid being pumped through the heat exchanger is an example of forced convection.
