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Conductance, gas flow and pressure question

  1. Jul 16, 2012 #1
    Hi there,

    I have been doing some research about vacuum system setup and I've seen the setup shown in the attachment.

    Pressure: P1a, P1b, P2a, P2b
    Throughput/gas flow: Q1, Qs
    Pump speed: Sp (pumping speed of the pump)
    Conductance:Ca, Cb, C

    Some papers have assumed that P2a = P2b, but it seems to me that will only work if Ca = Cb = 0.

    If Ca and Cb exist:
    P2a=(Q1+Qs)/Sa
    1/Sa=(C+Ca)+1/Sp

    and

    P2b=(Q1+Qs)/Sb
    1/Sb=1/(C+Cb)+1/Sp

    So to make P2a = P2b, Ca = 1 - Cb.

    Is that right? Or am I missing something?

    Thank you very much!
     

    Attached Files:

  2. jcsd
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