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critical Reynolds number

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Old   December 4, 2006, 05:31
Default critical Reynolds number
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jag
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what is the criticl Reynolds number when water flows through pipe? what is the critical Reynolds number when air flows through pipe? thanks
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Old   December 4, 2006, 10:32
Default Re: critical Reynolds number
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ag
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The critical Re for pipe flow is usually taken as ~ 2300, assuming you are referring to transition to turbulence. This Re is based on pipe diameter and does not depend on the type of fluid.
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Old   December 4, 2006, 12:35
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jag
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thanks for ur reply but Reynolds number = ud/kienmatic viscosity.. so Re depends on kinematic viscosity also..... this is my doubt..

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Old   December 4, 2006, 13:58
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ag
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Yes, it does - so use the correct kinematic viscosity for the appropriate fluid. The critical Re is still ~2300.
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Old   December 4, 2006, 23:26
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jag
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thank u......
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