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GATE 2022 MT – Question 18

Transport Phenomena and Rate Processes · Dimensional analysis · 1 mark · Multiple choice

In fluid flow, the dimensionless number that describes the transition from laminar to turbulent flow is _______

  1. Reynolds number
  2. Schmidt number
  3. Biot number
  4. Prandtl number

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Show answer and explanation

Correct answer: (A) Reynolds number

Explanation

Reynolds number Re=ρvL/μ compares inertial and viscous forces, governing the conventional transition criterion. Schmidt and Prandtl numbers compare diffusivities, while Biot compares thermal resistances.

Thus **A**.