If Reynolds number is _______, then the flow of fluid through a pipe is laminar.
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A.
> 2000
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B.
< 4000
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C.
> 4000
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D.
< 2000
Correct Answer:
D. < 2000
Explanation:
In fluid dynamics, the Reynolds number (Re) is a dimensionless value used to predict flow patterns by comparing inertial forces to viscous forces. For internal flow through a pipe, the flow is classified as laminar when the Reynolds number is low, typically less than 2000, because viscous forces dominate and keep the fluid moving in smooth, parallel layers. If the Reynolds number exceeds 4000, the flow becomes turbulent, while values between 2000 and 4000 represent a transitional phase. Therefore, the correct option is < 2000 (D).
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