Question

In which mode of heat transfer is the convection heat transfer coefficient usually higher, natural convection or forced convection?why?​

Answer 1

The convection heat transfer coefficient will usually be higher in forced convection since heat transfer coefficient depends on the fluid velocity, and forced convection involves higher fluid velocities. Heat transferred between the electric burner of a stove and the bottom of a pan is transferred by conduction. Convection is the heat transfer by the macroscopic movement of a fluid. This type of transfer takes place in a forced-air furnace and in weather systems, for example.

Answer 2

According to me ,in contrast, this process is accelerated by a fan (or other means) in a forced convection process. Thus, the heat is transferred much faster. This means that the increase in temperature is also much faster, and thus the higher heat transfer coefficient for forced convection.