Question

Nusselt number is the ratio of:

• A. Inertial to viscous forces
• B. Convective to conductive heat transfer
• C. Convective to radiative heat transfer
• D. Viscous to inertial forces

Hint:

Nusselt number compares convection to conduction: Nu = \( \frac{hL}{k} \). It’s key in analyzing heat exchanger and boundary layer performance.

Answer 1

The Correct Option is B

The Nusselt number (Nu) is a dimensionless quantity used in heat transfer calculations.
It represents the ratio of convective heat transfer to conductive heat transfer across a boundary.
Mathematically: \[ \text{Nu} = \frac{hL}{k} \] Where:
- \( h \) = convective heat transfer coefficient,
- \( L \) = characteristic length,
- \( k \) = thermal conductivity of the fluid.
A higher Nusselt number indicates that convection dominates, whereas a value close to 1 implies conduction is dominant.