The Flow in a Pipe is Laminar if

By Aina Parasher|Updated : July 25th, 2022

The flow in a pipe is laminar if the Reynold's number is

  1. Less than 2000
  2. Between 2000 and 4000
  3. Between 4000 and 6000
  4. Equal to 10000

Answer: A. Less than 2000

The flow in a pipe is laminar if the Reynold's number is less than 2000.

Solution

Reynolds number can be defined for pipe flow is ReVD/μ=VD/ν

Where,

ρ= Density of fluid

V = Velocity of fluid in Pipe

D = Diameter of pipe

μ= Dynamic viscosity of Fluid

ν= Kinematic viscosity of fluid

If Re ≤ 2000 - Laminar flow will occur in pipe flow

If 2000<Re<4000 - Transition will occur in pipe flow

If  Re ≥ 4000 - Turbulent flow will occur in pipe flow

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