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Why Re is different for external and internal flow

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Old   June 12, 2007, 22:46
Default Why Re is different for external and internal flow
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john
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We know that Reynold's no is different for internal flow and external flow? I wonder why does it happen? Is it the charecteristic length, which is different in both and so Re is different in both?
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Old   June 13, 2007, 05:36
Default Re: Why Re is different for external and internal
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laurent
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Reynolds number depends on velocity magnitude and viscosity. If the length is different with the same flow rate (and same fluid) the Reynolds is different.
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Old   June 13, 2007, 11:10
Default Re: Why Re is different for external and internal
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A A S
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I am not sure what you are asking. The Re is defined the same for every flow. I think what you are asking is why the Re for transition is different for external versus internal flow?
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Old   June 14, 2007, 03:53
Default Re: Why Re is different for external and internal
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laurent
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Me too... What do you mean exactly by internal and external flow ?
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