Consider a flat plate at a higher temperature than the fluid which is flowing over it, with some velocity. Forced convection is taking place. I'm convinced that the value of heat transfer coefficient h, depends on fluid properties, fluid flow regime, surface roughness and geometery of surface area. However, does it also depend on the temperature difference between the plate and the free stream? Does it also depend on the area of the flat plate?
Or the dependence of h on fluid properties, flow regime, surface roughness, geometery is given for a particular surface area and temperature difference?
Best Answer
The temperature dependence is embodied in the fluid properties. The local heat transfer coefficient is based on the local heat flux, which does not depend on the total area. The overall heat transfer coefficient is the average of the local heat transfer coefficient, integrated over the area.