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Pressure Drop Across Orifices

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DonyWane

DonyWane

Chemical
Joined
May 17, 2002
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Crane Technical Paper 410 provides a basic equation for the calculation of pressure drop across orifices:

q = (Cd*A)/(SQRT(1-B^4)))*SQRT(2gh)

or

q = CA*SQRT(2gh)

My question is: Does this equation hold for high pressure drops (approximately 80-85 psi) over very small orifices (~0.05" in diameter)? Are there better correlations for orifices this small with pressure differentials this high?

Thanks!
 
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Also, for further clarification, this is a liquid system.
 
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