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Old   July 25, 2004, 07:38
Default Slow flow
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What is a good approximation for very very slow flow, a few mm per hour, in a transient stage? Low velocity in a fluid with density similar to that of water. Does any body know about publications on the subject?
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Old   July 25, 2004, 08:44
Default Re: Slow flow
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Is your Re small? If so, this is Stokes (or creeping) flow, where the convection term is negligible compared to diffusion. In this case the solution is much easier - since convection usually causes most of the modeling difficulties - and the equations become similar in form to the heat conduction equation. I am not sure what is the common threshold for the applicability of this simplification, though - I think it is Re<1, but you should check it for yourself.
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Old   July 26, 2004, 17:57
Default Re: Slow flow
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Rami. Thank you. Do you know any publication showing classical cases?
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Old   July 29, 2004, 18:54
Default Re: Slow flow
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Use google and type "stokes flow", you will find tons of them and it is always discussed in traditional fluid mechanics books.
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