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.