Topic: Heat Transfer
$Nu=C{R_{e}}^{m}{P_{r}}^{n}$ represents heat transfer under-
- A. Free convection
- B. Forced convection
- C. Combined convection
- D. None of the above
Answer: B. Forced convection
Explanation: Forced convection refers to the transfer of heat through a fluid when an external force is applied to increase flow rate. The relationship $N_{u}=C R_{e}^{m} \cdot P_{r}^{n}$ represents the forced convection heat transfer. For free convection, it is represented as $Nu=C(Gr \cdot Pr)^{m}$.