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Old   April 26, 2009, 19:55
Default Reynolds number basis
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How do I convert a Reynolds number based on momentum thickness (Re theta) to a Reynolds number based on boundary layer thickness (Re delta) ?

This is for turbulent flow in a pipe over a rough boundary.

any help would be greatly appreciated.

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Old   April 27, 2009, 13:41
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In general the momentum thickness (for turbulent flows in pipe/channels) is about 7/72* BL thickness. So you can also use this ratio to compute your new Re.

You may also want to check if the following web-page is helpful.
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