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Mechanical Properties Of Fluids

Question
CBSEENPH11018415

Explain laminar flow and reynol'ds number.
What is the range in the value of Reynold's number for the flow of viscous liquid to be laminar?

Solution
Laminar flow generally occurs when the fluid is moving very slowly or if the fluid is very viscous. 

And Reynold's number is the ratio of how fast the fluid is moving to how viscous the fluid is. That is, reynold's number (NR) is directly proportional to velocity and inversely proportional to viscosity. 

If Reynold's number lies between 0 to 2000 then flow of viscous liquid is laminar. 

i.e.,                        NR < 2000