Time constant for Liquid to Gas flashing off.

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SUMMARY

The discussion centers on the time constant for the evaporation of volatile liquids, specifically liquid butane, when subjected to a sudden pressure drop from 8 bara to 1 bara. Participants highlight the lack of a definitive equation to calculate this time constant, emphasizing the importance of understanding the delay in phase change for accurate thermodynamic calculations in pressure-reducing devices. The Clausius-Clapeyron equation is recommended as a potential resource for gaining insights into this phenomenon.

PREREQUISITES
  • Understanding of phase change dynamics in thermodynamics
  • Familiarity with the Clausius-Clapeyron equation
  • Knowledge of pressure reduction effects on volatile liquids
  • Basic principles of thermodynamic properties in engineering
NEXT STEPS
  • Research the Clausius-Clapeyron equation and its applications in phase transitions
  • Investigate the thermodynamic properties of butane under varying pressure conditions
  • Explore models for calculating time constants in phase change processes
  • Study the design and functionality of pressure-reducing devices in thermodynamic systems
USEFUL FOR

Engineers, thermodynamic researchers, and professionals involved in the design of pressure-reducing devices and those studying phase change dynamics in volatile liquids.

246ohms
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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
 
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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!
 

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