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-   -   Why Re is different for external and internal flow (http://www.cfd-online.com/Forums/fluent/45012-why-re-different-external-internal-flow.html)

john June 12, 2007 22:46

Why Re is different for external and internal flow
 
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?

laurent June 13, 2007 05:36

Re: Why Re is different for external and internal
 
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.

A A S June 13, 2007 11:10

Re: Why Re is different for external and internal
 
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?

laurent June 14, 2007 03:53

Re: Why Re is different for external and internal
 
Me too... What do you mean exactly by internal and external flow ?


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