A fluid is flowing inside the inner tube of a double pipe heat exchanger with diameter ‘d’. For a fixed mass flow rate, the tube side heat transfer co-efficient for turbulent flow conditions is proportional to_____________________?

Question

Accepted Answer

d-0.2. For turbulent flow in a pipe, the heat transfer coefficient is often found to be proportional to a power of the diameter, and d^-0.2 is the expected relationship.