Question

definition of Critical Velocity ​

Answer 1

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The flow of a fluid, whether streamline or turbulent, is differentiated on the basis of velocity of the flow. The velocity beyond which a streamline flow becomes turbulent is called critical velocity.

Answer 2

Answer:

Critical velocity is defined as the speed at which a falling object reaches when both gravity and air resistance are equalised on the object.

The other way of defining critical velocity is the speed and direction at which the fluid can flow through a conduit without becoming turbulent. Turbulent flow is defined as the irregular flow of the fluid with continuous change in magnitude and direction. It is the opposite of laminar flow which is defined as the flow of fluid in parallel layers without disruptions of the layers.

Critical velocity formula

Following is the mathematical representation of critical velocity with the dimensional formula:

VC=Reηρr

Where,

Vc: critical velocity

Re: Reynolds number (ratio of inertial forces to viscous forces)

: coefficient of viscosity

r: radius of the tube

⍴: density of the fluid

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