Flow Through Irregular Orifices
Flow Through Irregular Orifices
(OP)
I need to estimate compressible fluid flow through an irregular orifice (i.e., a thin, circular ring or gap as opposed to a circular hole). I would think that an upper bound would be provided by modeling my flow area as a circular hole with an equivalent flow area to my "gap" area. However, I need a more accurate estimate...a conservative upper bound will not help me much. Does anyone have any correlations for this sort of orifice/flow path or know where to point me to? If it helps, the pressure drop across the orifice will be on the order of 10 to 25 psi.
Thanks!
Thanks!





RE: Flow Through Irregular Orifices
Hope this helps.
saxon
RE: Flow Through Irregular Orifices
RE: Flow Through Irregular Orifices
RE: Flow Through Irregular Orifices
When you say the "wetted perimeter of the orifice," do you mean I need to choose a standard "hole" orifice with an equal perimeter and run the flow equations?
I could calculate the annular diameter...or is that what you meant?
There was some discussion in a MechE forum that I found (and I believe that you participated in). The result of that discussion..for incompressible flow...was that an article by Lenkei could provide some insight. Are you familiar with that article, and if so, would it provide insight for compressible fluid flow?
RE: Flow Through Irregular Orifices
RE: Flow Through Irregular Orifices
As far as the flow through your 0.7" slot, you know the area and you either know the pressure drop or you can estimate the fluid velocity. Either way you can come up with a flow estimate. Exact, hardly, but by the same token not to bad.
you are describing a common estimate made in civil hydraulics in regard to storm intercept leakage and or inflows. it is do able
RE: Flow Through Irregular Orifices
Thanks again for the discussion.
RE: Flow Through Irregular Orifices
this is not rocket science, just estimate it and be done with it
RE: Flow Through Irregular Orifices