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Choking in a Circular Orifice Plate in a pipe 
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#1
Jan2109, 01:14 PM

P: 9

The equation I have for velocity through a circular orifice plater is as follows:
[tex]Ud = \frac{Yi\timesC}{\sqrt{(1(d/D)^4)}}\sqrt{\frac{(2\times(P_{2}P_{1})}{\rho}}[/tex] To my understanding, flow becomes choked when this velocity exceeds a Mach number of 1, and is no longer subsonic. Intuitively, decreasing orifice diamter would increase the likelyhood of choke (at least in my mind), but this does not seem to be the case. If d/D is decreased, the denominator becomes larger, and the velocity becomes smaller, in turn yielding a smaller mach number. Can anyone explain this so that it make more intuitive sense to me, or tell me if my thouhgt process is off. Thanks alot 


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