Time constant for Liquid to Gas flashing off.

[246ohms]

I am having a problem finding out how long it takes for a volatile liquid to evaporate when suddenly the pressure is reduced.

For example - let's assume liquid butane at 8 bara is suddenly dropped to 1bara, the process of liquid turning to gas is not instantaneous so how long does it take.

Is there any law or equation that gives this time constant.

I am working on a pressure reducing device and any delay in the flash off from liquid to gas makes a big difference in the equations used to calculate the devices thermodynamic properties.

Thanks 246ohms

 

[Almsco]

That's a great question, 246ohms. Unfortunately, I'm not sure if there is an exact equation or law that can give you the time constant for the process of liquid turning to gas when the pressure is suddenly reduced. However, I would suggest looking into the Clausius-Clapeyron equation as it may be able to give you some insight. Good luck with your project!