Long Bore Orifice
Long Bore Orifice
(OP)
I've been given the task of calculating the flow of a compressible fluid (nitrogen in this particular case) through a long bore orifice (it WILL potentially go sonic). I suppose the best way to think of it would be a hole drilled thru a fitting in the end of a rigid vessel. The hole is about 3/8" in diameter while the fitting is about 2 to 3 inches in diameter. The length thru the bore of the fitting (to the interior of the tank) is about 1.5 to 2 inches. I am not certain what equations to use for this application since it seems to be somewhere between an orifice and a flush inlet to a short tube. Anyone have any recommended formulas for calculating compressible mass flow rates in this situation? I am leaning towards a tube long tube with a contaction coefficient factored in for the vena contracta I assume will be there. I am also not certain that the contraction coefficient is constant since it seems to me that it might vary with flow rate. Thanks for any input!





RE: Long Bore Orifice
Is this the thickness of the metal the 3/8" hole goes through? If not, what is that metal thickness?
Good luck,
Latexman
RE: Long Bore Orifice
RE: Long Bore Orifice
Will Chevron Corp.
RE: Long Bore Orifice
Bob
RE: Long Bore Orifice
So, you were leaning the right way!
Good luck,
Latexman
RE: Long Bore Orifice
Will Chevron Corp.
RE: Long Bore Orifice
This vessel I have described is in another larger vessel. Both are initially under vacuum. We need to repressurize both vessels so that the vessel I am asking about is not crushed in the process. It is a very thin wall vessel and cannot take a large pressure differential outside to inside during hte backfill process.
RE: Long Bore Orifice
RE: Long Bore Orifice