Allied & ICAR Exam Bank • ALLIED_0705 MCQ • 1 Mark

Section 7: Dairy and Food Engineering

Heat and Mass Transfer in Food Processing

Subtopic: Heat and Mass Transfer in Food Processing

Question Statement:

The thermal boundary layer thickness $\delta_t$ and velocity hydrodynamic boundary layer thickness $\delta$ are approximately equal when:

Options:

  • (A) Prandtl number $Pr \approx 1.0$
  • (B) Prandtl number $Pr \gg 100$
  • (C) Prandtl number $Pr \ll 0.01$
  • (D) Reynolds number is zero

Answer Key:

A

Step-by-Step Solution & Explanation

Since $\delta / \delta_t \approx Pr^{1/3}$, when $Pr \approx 1.0$ (as in many gases and air), the hydrodynamic and thermal boundary layers develop at the same rate.
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