Forced Convection Heat Transfer Coefficient

Natural convection 5 25 w m k.

Forced convection heat transfer coefficient. Cold air flows past the radiator due free convection and is heated. Consider the flow of a fluid over a flat plate the velocity and the temperature of the fluid approaching the plate is uniform at u and t. For a vertical flat plate the characteristic length is the plate vertical length l since h depends on the fluid properties flow regime and the flow geometry its calculation is generally complex. Overall u btu hr ft 2 f steam.

Such a situation can be seen for example with a radiator. The value of convective heat transfer coefficient hc depends on the type of media gas or liquid flow velocity and temperature difference. Forced convection 10 200 w m k. Evaporators heat transfer coefficients.

Monsif shinneeb 2 where k is the thermal conductivity of the fluid and l c is the characteristic length. The heat transfer coefficient describes the convective heat transfer from a solid to a flowing fluid gas or liquid or vice versa. 100 200. Heavy oils vacuum 25 75.

75 150. Formula for convective heat transfer coefficient calculation. 80 180. Obviously the radiator transfers heat to the passing air.

The convection heat transfer coefficient in general varies along the flow direction. Applied heat transfer mce 3413 free and forced convection experiment dr.