Time constant for Liquid to Gas flashing off.

AI Thread Summary
The discussion centers on the challenge of determining the time it takes for a volatile liquid, such as butane, to evaporate when pressure is suddenly reduced from 8 bara to 1 bara. Participants express uncertainty about the existence of a specific equation or law that can provide a time constant for this phase change. The Clausius-Clapeyron equation is suggested as a potential resource for understanding the thermodynamic properties involved. The delay in the evaporation process is highlighted as critical for accurately calculating the performance of a pressure-reducing device. Overall, the conversation emphasizes the complexity of modeling the evaporation time under sudden pressure changes.
246ohms
Messages
14
Reaction score
2
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
 
Physics news on Phys.org
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!
 
Thread 'Question about pressure of a liquid'

Thread 'Question about pressure of a liquid'

I am looking at pressure in liquids and I am testing my idea. The vertical tube is 100m, the contraption is filled with water. The vertical tube is very thin(maybe 1mm^2 cross section). The area of the base is ~100m^2. Will he top half be launched in the air if suddenly it cracked?- assuming its light enough. I want to test my idea that if I had a thin long ruber tube that I lifted up, then the pressure at "red lines" will be high and that the $force = pressure * area$ would be massive...
View full post »

Thread 'Why is the 3 body problem unsolvable? And what will happen if someone solves it?'

I feel it should be solvable we just need to find a perfect pattern, and there will be a general pattern since the forces acting are based on a single function, so..... you can't actually say it is unsolvable right? Cause imaging 3 bodies actually existed somwhere in this universe then nature isn't gonna wait till we predict it! And yea I have checked in many places that tiny changes cause large changes so it becomes chaos........ but still I just can't accept that it is impossible to solve...
View full post »

Similar threads

What is the time constant to evaporate a liquid
Replies
2
Views
1K
A Resonant frequencies of liquid in a cylinder
Replies
14
Views
2K
I How to calculate the mass of gas in a tank?
3
Replies
109
Views
7K
A Can Hamson-Linde cycle liquidize N2?
Replies
7
Views
2K
B What causes the drop of latent heat at lower temperatures in liquid helium?
Replies
2
Views
2K
I Liquid-gas phase transition: metastable mixed states?
Replies
1
Views
2K
A How Does Jet Injection Work in Fluid Dynamics?
Replies
6
Views
1K
How does an LPG tank gauge work?
Replies
12
Views
6K
Bi-propellant Liquid Fuel Engine Pressures Before Thrust Chamber
Replies
2
Views
3K
The reservoir of refrigerant between condenser & metering device
Replies
7
Views
2K

Hot Threads

Recent Insights

Back
Top