Question

The Prandtl number is the

• A. Ratio of kinematic viscosity to thermal diffusivity
• B. Ratio of thermal diffusivity to kinematic viscosity
• C. Product of thermal diffusivity and kinematic viscosity
• D. Ratio of absolute viscosity to thermal conductivity

Hint:

Prandtl = momentum diffusivity / thermal diffusivity

Answer 1

The Correct Option is B

The Prandtl number ($Pr$) is defined as the ratio of momentum diffusivity (kinematic viscosity) to thermal diffusivity: \( Pr = \frac{\nu}{\alpha} \).