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Critical Velocity and Reynold's Number

Critical velocity is that velocity of liquid flow upto which its flow is streamlined and above which its flow becomes turbulent.
Reynold’s number is a pure number which determines the nature of flow of liquid through a pipe. It is defined as the ratio of the inertial force per unit area to the viscous force per unit area for a flowing fluid. By the definition of Reynolds number,
If the value of Reynold’s number:
  • Lies between 0 and 2000, the flow of liquid is streamlined or laminar.
  • Lies between 2000 and 3000, the flow of liquid is unstable changing from streamlined to turbulent flow.
  • Above 3000, the flow of liquid is definitely turbulent.

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