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Time constant for Liquid to Gas flashing off.

  1. Feb 17, 2009 #1
    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 - lets 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 differance in the equations used to calculate the devices thermodynamic properties.

    Thanks 246ohms
  2. jcsd
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