gas expansion calculation
gas expansion calculation
(OP)
I am flowing 100 sccm gas through 10 orifii of diameter 0.016". The gas is either B2H6 or BF3.
I want to do a gas expansion calc to determine a minimum pressure gradient needed to establish a sonic front.
I want to do a gas expansion calc to determine a minimum pressure gradient needed to establish a sonic front.





RE: gas expansion calculation
To determine the pressure drop, either upstream stagnation pressure or downstream static pressure must also be given.
RE: gas expansion calculation
In this case, downstream static pressure is 6, 8, or 10 mTorr.
RE: gas expansion calculation
The crictal pressure ratio of upstream STAGNATION PRESSURE to downstream STATIC PRESSURE =
[(GAMMA+1)/2] RAISED TO POWER [1/(GAMMA-1)]
WHERE GAMMA IS RATION OF Cp/Cv