In McCabe and Smith, the Orifice Si
In McCabe and Smith, the Orifice Si
(OP)
In McCabe and Smith, the Orifice Sizing equation for mass flowrate for compressible fluid is only applicable to fluids having pressure ratio above 0.53. (page 232, 7th edition).
Can someone advise what equation to use for 0.53 and below? Thanks.
Can someone advise what equation to use for 0.53 and below? Thanks.





RE: In McCabe and Smith, the Orifice Si
Good luck,
Latexman
RE: In McCabe and Smith, the Orifice Si
Good luck,
Latexman
RE: In McCabe and Smith, the Orifice Si
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
RE: In McCabe and Smith, the Orifice Si
Thanks for the reply!!
Christopher Kenneth Choa
RE: In McCabe and Smith, the Orifice Si
Christopher Kenneth Choa