Question

What is critical velocity of liquid? Obtain an expression for Reynold’s number. Give its physical significance.

Answer 1

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. ... Lies between 0 and 2000, the flow of liquid is streamlined or laminar.