Hello all. I'm a newbie here, searching for opinions on orifice sizing.
For a vapor through a hole (in this case, saturated steam), I was recommended the following equation (from Crowl/Louvar):
Qm (choked)
= Co A Po SQRT{(k gc M / Rg To)*(2/k+1)^[(k+1)/(k-1)]}
(Equation is provided in the old units, not SI)
Then you vary the orifice diameter - which changes the cross sectional area A - and thus, changes the maximum flow Qm (choked). Keep varying the diameter til you get the max flow that is required.
Is this correct? I'm asking because I'm getting a very low calculated result compared to the expected result. Example I'm getting only 11kg/hr instead of, say, 1100kg/hr.
For a vapor through a hole (in this case, saturated steam), I was recommended the following equation (from Crowl/Louvar):
Qm (choked)
= Co A Po SQRT{(k gc M / Rg To)*(2/k+1)^[(k+1)/(k-1)]}
(Equation is provided in the old units, not SI)
Then you vary the orifice diameter - which changes the cross sectional area A - and thus, changes the maximum flow Qm (choked). Keep varying the diameter til you get the max flow that is required.
Is this correct? I'm asking because I'm getting a very low calculated result compared to the expected result. Example I'm getting only 11kg/hr instead of, say, 1100kg/hr.