Question

The purpose of providing fins on heat transfer surface is to increase 
1. Temperature gradient so as to enhance heat transfer by convection 
2. Effective surface area to promote rate of heat transfer by convection 
3. Turbulence in flow for enhancing heat transfer by convection 
4. Pressure drop of the fluid

Answer 1

Correct Answer - Option 2 : Effective surface area to promote rate of heat transfer by convection 

Concept:

Calculation:

Convective heat transfer is given by

Q= hA(ΔT)

From the above we can say that, convective heat transfer can be increased by increasing effective surface area.

This will be done by providing fins on the heat transfer surface.