Question

What is critical velocity?? ​

Answer 1

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✨It is the velocity required to put the satellite into its orbit around the satellite .

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Answer 2

• Critical velocity is the velocity (speed and direction) at which the flow of a liquid through a tube changes from laminar (smooth) to turbulent.

• 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.

Following is the mathematical representation of critical velocity :

Vc = Reη/ρr

Vc = Reη/ρrWhere, Vc is critical velocity ; Re is Reynolds number (ratio of inertial forces to viscous forces) ; is coefficient of viscosity ; r is radius of the tube ; ⍴ is the density of the fluid