Derive the following expression for heat transfer:

Question

Water enters a tube of dia D and length L. Inlet and outlet temperature are T₁ and T₂ respectively and wall temperature is T₀. Convective heat transfer is h.

1. Derive the following expression for heat transfer:
2. what is the significance of the logarithmic term in part (i) above?
3. State assumptions used in part (i)

1.