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Fluid Mechanics
Bernoulli's Equation
GATE 2020
Easy

Incompressible flow of a constant-property fluid over a smooth, thin, wide flat plate has constant free-stream velocity parallel to the plate. The Reynolds number at 2.0 m from the leading edge is 8000. The flow within the boundary layer at 1.0 m from the leading edge is

  • laminar
  • Bturbulent
  • Ctransitioning from laminar to turbulent
  • Dinviscid

Explanation

Re_x scales linearly with x. At x=1.0m, Re_x=8000/2=4000, far below the typical flat-plate transition Reynolds number of ~5×10⁵ — the flow is still laminar.

Source: GATE CH 2020 (2020)

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