Critical velocity equation, fluids

[gofish6060]

Should I memorize the equation for critical velocity of a fluid (Vc=Nn/pD) regarding laminar flow/turbulence? If not, what important ideas should I take home? Thank You

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[Ssina]

I don't think we should memorize the equation... I think if they give it, it'll be in a passage with the equation and then there will probably be a question that you have to work with the relationship between velocity of the fluid with the density or viscosity!

 

[Pisiform]

The main idea is that, the greater the viscosity, the smaller the Reynolds and smaller Reynold number means less turbulence.

As a ball park, also remember that the flow is turbulent when Re > 20,000