Outline of the Lecture:
• Introduce concept of thermal entrance length in hydrodynamically fully developed but thermally developing flow in pipe
• Derive the energy equation and boundary condition into non dimensional form for uniform wall temperature of a duct
• Reduce the energy equation into simplified form for thermally developing region with boundary condition
• Determine the Nusselt number for thermally developing but hydrodynamically fully developed forced convection inside duct having constant wall temperature