Steam flow rate

[EITProcess]

I'm attempting to determine the mass flow rate of 30 psig steam through a 3/4" diameter hole to atmosphere. What would be the best equation(s) to use? Assume there is an infinite supply.

Thanks for the help.

 

[hacksaw]

you need to be dealing in terms of absolute pressure and you need to specify the quality or the super heat...

representative disch. coefficients are in almost any process/mechanical handbook...look for it

 

[davefitz]

The choked flow of compressible steam through a square edged hole is a function of the speed of sound ( which is primarily a function of the steam temperature) in the upstream steam and the ratio of the hole diameter to the thickness of the vessel [ Cd= F( t/d) ].

For most practical ratios of t/d, Cd= 0.83