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1d pipe flow vs 3D pipe flow

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Old   May 20, 2009, 10:17
Default 1d pipe flow vs 3D pipe flow
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I'm a CFD person who does not have much experience in flows in pipes. My question is if the pipe length to diameter ratio is x (L/D = x), what is a safe value of x that I should have to consider the flow as one-dimensional? I was thinking about something in the order of 100. Is that a fair estimate?

I am looking into problem of cooling/heating in pipes and the L/D ~ 300.
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Old   May 20, 2009, 10:38
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It all depends on the flow. For laminar flow the length is much higher, at about 120. For turbulent flow in a smooth pipe about 50.
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