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For the occurrence of laminar flow through pipes, the value of Reynold’s number shall be less than:

Laminar flow sometimes occurs when a fluid flows in parallel layers, with no disruption between the layers. It is also called streamline flow.

The Reynolds number (Re) is used to classify the type of flow, whether it 1s laminar, transitional, or turbulent. In the case of flow-through pipes, the classification is

Laminar flow—Re < 2000
Transitional flow—2000 ≤ Re ≤ 4000
Turbulent flow—Re > 4000.

For open channel flow:

Laminar flow—Re < 500
Transitional flow—500 ≤ Re ≤ 2000
Turbulent flow—Re > 2000.

Hence for the occurrence of laminar flow through pipes, the value of Reynold’s number shall be less than 2000.