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In McCabe and Smith, the Orifice Si
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in the 7th ed it is on p.213, and references compressible flow through orifices and venturis
the pressure ratio he uses is discharge ratio, i.e. the exit to inlet pressure ratio.
once the discharge is below 0.53 or so, you have sonic flow at the throat of venturi, as the pressure is reduced the mass flow stays fixed, and the basis for critical flow venturi and flow nozzles used in flow calibration
this is only approximately true for sharp edged orifices
the restriction to pressure ratios above 0.53 is for none critical flow conditions
the pressure ratio he uses is discharge ratio, i.e. the exit to inlet pressure ratio.
once the discharge is below 0.53 or so, you have sonic flow at the throat of venturi, as the pressure is reduced the mass flow stays fixed, and the basis for critical flow venturi and flow nozzles used in flow calibration
this is only approximately true for sharp edged orifices
the restriction to pressure ratios above 0.53 is for none critical flow conditions
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