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The maximum velocity upto which fluid motion is streamline is called

  • A.Viscous force
  • B.Critical velocity
  • C.Streamline flow
  • D.Terminal velocity

Answer: B

This is the critical velocity.

Above it the flow turns turbulent. It follows from the Reynolds number: \[v_c = \frac{R_e\,\eta}{\rho D}\] Flow is laminar below about \(R_e = 2000\) and turbulent above about 3000.

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