Question Bank • QB_SUB_DFE_CNV_001 MCQ • 1 Mark

Section 7: Dairy and Food Engineering

Convective Heat Transfer & Dimensionless Numbers

Subtopic: Prandtl number physical significance

Question Statement:

The Prandtl number ($Pr = \nu / \alpha$) physically compares:

Options:

  • (A) Momentum diffusivity (kinematic viscosity) to thermal diffusivity
  • (B) Convective heat transfer to conductive heat transfer
  • (C) Inertial forces to gravitational forces
  • (D) Sensible heat to latent heat of vaporization

Answer Key:

A

Step-by-Step Solution & Explanation

$Pr = \frac{\nu}{\alpha} = \frac{\mu c_p}{k}$, which represents the relative rate of momentum diffusion versus thermal diffusion in the fluid.
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