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Which of the following statements is/are CORRECT regarding the flow of fluid? a) All fluid layers are parallel to each other in case of turbulent flow. b) The Reynold’s number is less than 2000 for turbulent flow and greater than 4000 for laminar flow. c) Two fluid layers don’t cross each other in case of laminar flow

Which of the following statements is/are CORRECT regarding the flow of fluid? a) All fluid layers are parallel to each other in case of turbulent flow. b) The Reynold’s number is less than 2000 for turbulent flow and greater than 4000 for laminar flow. c) Two fluid layers don’t cross each other in case of laminar flow Correct Answer Only c is correct

CONCEPT:

  • Reynolds number is a dimensionless formula that is used to differentiate laminar flow from turbulent flow. It is denoted by Re.
  • If Re ≤ 2000 then flow is laminar.
  • 2000 ≤ Re ≤ 4000 then flow is transitional.
  • Re ≥ 4000 then flow is turbulent.

 

Laminar flow

Turbulent flow

Laminar flow is the flow in which fluid particles flow in layers. Each layer moves smoothly past the adjacent layer with little or no intermixing. 

Turbulent flow is the flow in which fluid particles flow in a random fashion where intermixing/intermingling is present.

 

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All the fluid layers move parallel to each other. They can’t cross each other.

Fluid layers are not parallel to each other. They can cross each other.

Reynold’s number is less than 2000 for laminar flow.

Reynold’s number is more than 4000 for turbulent flow.

 

EXPLANATION:

  • As the fluid layers don’t move parallelly in case of turbulent flow, so statement a is wrong.
  • Two fluid layers can’t cross each other in laminar flow. So statement c is correct.
  • The Value of Reynold’s number is less than 2000 for laminar flow and greater than 4000 for turbulent flow. So statement b is wrong.

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