For a hydrodynamically and ther mally fully developed laminar

Home » Heat-Transfer » Heat Transfer Miscellaneous » Question

For a hydrodynamically and ther mally fully developed laminar flow through a circular pipe of constant cross-section. The Nusselt number at constant wall heat flux (Nu_q) and that at constant wall temperature (Nu_T) are related as

1. Nu_q = Nu_T
2. (Nu_q = Nu_T)²
3. Nu_q < Nu_T
4. Nu_q > Nu_T

Correct Option: D

(Nu)_q for constant wall heat flux and (Nu)_T at constant wall temperature for a hydrodynamically and t hermally fully developed laminar flow through a circular pipe of constant cross-section is 4.36 and 3.66 respectively. Hence, (Nu)_q > (Nu)_T