Laminar flow is smooth flow in a straight line. Laminar is the opposite of turbulent flow.
In pipelines, laminar flow occurs when Reynolds number is less than 2,100.
$latex R_e < 2,100&s=2$
If a stream of dye is inserted into the flow and it continues in a straight, unbroken line, the flow is laminar.
Flow Types
The opposite of laminar flow is turbulent flow, which occurs at a Reynolds number above 4,000.
Laminar: Re < 2,100
Transition: 2,100 < Re < 4,000
Turbulent: Re > 4,000
Transition: 2,100 < Re < 4,000
Turbulent: Re > 4,000
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