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Fixed Orifice Plate - choked flow

Fixed Orifice Plate - choked flow

Fixed Orifice Plate - choked flow

(OP)
I am evaluating a relief valve case where the governing case includes flow through a fixed orifice plate.  Using the Crane equation for compressible gas I am needing to compute the expansion factor Y.  The system will take quite a pressure drop across the plate.  My question is "For high pressure ratios is there a terminal ratio and Y factor for orifices". When performing a similar calc for nozzles, there is a lower limit for the expansion factor and dP/P is set at choked conditions.  Thanks for your input.

RE: Fixed Orifice Plate - choked flow

Quote (Bill3752):

For high pressure ratios is there a terminal ratio and Y factor for orifices?
Not for a thin plate orifice.  Here's a good post that speaks to that somewhat indirectly: thread798-189979: Restrictive Orifice.

Good luck,
Latexman

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