Register to reply

Choking in a Circular Orifice Plate in a pipe

by boka33
Tags: choking, circular, orifice, pipe, plate
Share this thread:
Jan21-09, 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 sub-sonic.

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
Phys.Org News Partner Physics news on
'Squid skin' metamaterials project yields vivid color display
Team finds elusive quantum transformations near absolute zero
Scientists control surface tension to manipulate liquid metals (w/ Video)

Register to reply

Related Discussions
Orifice plate diameter sizing Engineering Systems & Design 10
Flow in a semi circular pipe Materials & Chemical Engineering 3
Hydrodynamic cavitation via an orifice plate Materials & Chemical Engineering 1
How to design an orifice plate Engineering Systems & Design 1
Circular Plate Introductory Physics Homework 20