Question

How does the local and average heat transfer coefficients are related to each other for flow over a flat plate?

Answer 1

Answer:

The average friction and heat transfer coefficients in flow over a flat plate are determined by integrating the local friction and heat transfer coefficients over the entire plate, and then dividing them by the length of the plate.

Answer 2

Answer:

Actually the Convective heat transfer doesn't depend on the length of particular surface, but it depends on the Surface area of the body/surface according to Q(conv) = h(conv heat transfer co efficient) *A(surface area) * (change in temperature).

Hence higher the surface area in contact, higher will be the heat transfer rate.