Shear velocity is

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SSC JE ME Previous Paper 15 ( Held on: 3 March 2017 Morning)
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  1. non – dimensional quantity
  2. a convenient fictitious quantity
  3. the velocity of fluid at the edge of laminar sub – layer
  4. the velocity of fluid at the edge of roughness

Answer (Detailed Solution Below)

Option 2 : a convenient fictitious quantity
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Shear velocity:

  • It is also known as frictional velocity is fictitious quantity, and it characterizes the shear at the boundary.
  • The shear velocity characterizes the turbulence strength and laminar sub-layer thickness.
  • It relates shear stress in terms of velocity and is given by \(\sqrt {\frac{{{\tau _o}}}{\rho }} \)
  • ∴ Shear velocity \(u* = \sqrt {\frac{{{\tau _o}}}{\rho }}\) .
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