CO2 / N2 Mixed Gas Behavior Question
CO2 / N2 Mixed Gas Behavior Question
(OP)
I'm working on an application that utilizes liquified CO2 (at vapor pressure) to act on a hydraulic bladder (similar to an accumulator) with the goal of providing a constant pressure as the volume of oil in the bladder fluctuates. The device operates in a 17-26C environment creating fluctuation in vapor pressure of ~20% which is undesirable. I ran a test using a 75% N2 / 25% CO2 mix which significantly reduced the pressure fluctuation at these temperature extremes.
My question is, will the N2 / CO2 mixed gas act like a traditional gas (pressure drops when volume increases), liquified gas (constant pressure when liquid exists) or as a hybrid of the two?
If the latter, would there be an optimum mix ratio to deliver near constant pressure with varying volume while minimizing temperature related effects?
Thanks for your time.
My question is, will the N2 / CO2 mixed gas act like a traditional gas (pressure drops when volume increases), liquified gas (constant pressure when liquid exists) or as a hybrid of the two?
If the latter, would there be an optimum mix ratio to deliver near constant pressure with varying volume while minimizing temperature related effects?
Thanks for your time.





RE: CO2 / N2 Mixed Gas Behavior Question
I don't think there is an optimum, rather more a linerly proportionally determined point where you have still acceptable performance.
You could achieve similar results by increasing the size of the vessel containing the bladder. A given change in bladder volume would produce a lesser change in the vessel's pressure as the vessel's volume increases.
Learn from the mistakes of others. You don't have time to make them all yourself.
RE: CO2 / N2 Mixed Gas Behavior Question
Thanks again!
RE: CO2 / N2 Mixed Gas Behavior Question
sometimes I focus too much on one preferred solution at the expense of other methods that just might be easier.
Learn from the mistakes of others. You don't have time to make them all yourself.