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MPSC Assistant Engineer EE Mains 2018 - Paper 1

Option 2 : Laminar flow

ST 1: Building Construction and Materials

1423

20 Questions
40 Marks
24 Mins

Reynold's number: It is a pure number that determines the nature of the flow of liquid through a pipe. It is defined as the ratio of the inertial force per unit area to the viscous force per unit area for a flowing fluid.

Reynold's number is written as NR.

N_{R} = Inertial force per unit area/Viscous force per unit area

Mathematically it is written as

\(R_e =\frac{ρ V D}{η}\)

Where ρ = Density of liquid, V = Velocity of liquid, D = Diameter of the pipe

- If Reynold's number lies between 0 to 2000, then the flow of liquid is streamlined or laminar.
- If Reynold's number lies between 2000 to 3000, the flow of liquid is unstable and changing from streamline to turbulent flow.
- If Reynold's number is above 3000, the flow of liquid is turbulent.