ISRO Mechanical & Aerospace 2018 - Question 34

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Topic: Heat Transfer

For a fluid having Prandtl number equal to unity, the relation between hydrodynamic boundary layer thickness (delta_1) and thermal boundary layer thickness (delta_2) is

  • A. delta_1 > delta_2
  • B. delta_1 < delta_2
  • C. delta_1 = delta_2
  • D. delta_2 = delta_1 / 3

Answer: C. delta_1 = delta_2

Explanation: The relationship is given by Pr^(1/3) = delta_1 / delta_2. If Pr = 1, then delta_1 = delta_2.

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