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I Calculating gas flow trough a pipe and a nozzle

  1. Apr 30, 2016 #1
    Hello there. I am struggling with some gas flow calculations that, I think, should be quite basic. However, I think that I miss the knowledge background for it.

    I have a setup that I am showing in the attached file but here are more details:
    -I have a vacuum chamber pumped with a turbo pump to a few 10-5 mbar.
    -A gas ligne brings a noble gas into the chamber.
    -The gas is delivered through a micro-pipette.
    -The micro-pipette diameter is 100um where the gas leaves the nozzle for the chamber and this diameter is slowly increasing until it is 2mm at the other side of the micro-pipette where it is connected to the gas line.
    -On the gas line, just before the ligne goes into the vacuum chamber, there is a manometer.

    I would like to calculate the gas flow rate from the pressure measured on the manometer but I don't know how to proceed because it can be very different depending on the flow type etc. and I don't know how to determine the flow type. Does someone has any idea how I should do? Any reference book would be very welcome too.

    Thanks in advence.
     

    Attached Files:

  2. jcsd
  3. May 5, 2016 #2
    Thanks for the post! 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?
     
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