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Choked gas flow

  1. Sep 14, 2016 #1

    1. The problem statement, all variables and given/known data
    I have the following question in my course work. What I do not understand is why it provides the relative density of natural gas?!

    Calculate the equivalent choked flow of propane through a particular valve if the choked flow of natural gas through it is 10 litres s–1.

    The relative density* of propane is 1.45 and that natural gas is 0.65. [*with reference to air]

    2. Relevant equations

    I believe the equation I need to use is:

    Qvf = Qvr * sqrt(1/d)


    Qvf = volumetric flow of the actual fluid (the propane)
    Qvr = volumetric flow of the reference fluid (the natural gas) = 10l/s-1
    d = relative density of the actual fluid = 1.45

    3. The attempt at a solution

    Qvf = 10 * sqrt (1/1.45) = 8.304L/s-1

    Am I going wrong somewhere?

  2. jcsd
  3. Sep 19, 2016 #2
    Thanks for the thread! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post? The more details the better.
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