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Civil Engineering PE

Category - Hydraulics - Open

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For an open channel, the flow may be laminar or turbulent. To determine if open channel flow is laminar, the Reynolds Number, Re, must be which of the following?

Re < 500
Re < 1,000
Re > 2,000
Re > 4,000

Explanation

Answer: A - To determine if open channel flow is laminar, Re must be less than 500. The limit for turbulent flow in an open channel is Re >1,000. For pipe flow, the limits are as follows:
Laminar: Re < 2,000
Turbulent: Re > 4,000

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