Compressed Air Leak into a Liquid 2

[Kisic7]

Does anybody know how to calculate the CFM on a compressed air leak when the air is not blowing into the atmosphere but into a liquid like the pickling acid?

I am trying to replace a compressed air bubble-system agitator with an energy efficient eductor in a tank mixing application. However, I do not know how to estimate the amount of air that is currently being blown through the agitator. I know that the agitator is currently blowing compressed air from a 1/8” pipe, and the CA line pressure is 95 psig. I do not know the density or the temperature of the acid being mixed but I can easily get that information if I find some use for it. Is there an equation for CA leaks that deals with the situation of leaks underwater or other liquids?

Please help

 

[StoneCold]

My take on it would be to just adjust the pressure drop across the hole/holes by the hydraulic pressure of the solution. So maybe a couple of psi if it is not deep. Or I would ignore it as it is not going to affect your answer much anyway. You are probably choked in the 1/8" pipe.

Regards
StoneCold

 

[TD2K]

I'd ignore it unless it's a really tall tank ;-)

If the air pressure is 95 psig inside the line and it's discharging to the static head inside a tank, you are almost certainly have choked flow through the orifice (dP/Pinlet > 0.5 where Pinlet is the absolute pressure). If you do have choked flow, the static head in the tank is not going to affect the flow rate.