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Homework Help: Pressure Drop

  1. Jul 11, 2015 #1
    1. The problem statement, all variables and given/known data
    During measurement of pressure differences by the using orifice and an electronic transducer, we can have some oscillation on diaphragm, I try to define this effect by the calculating pressure drop from vena contracta to transducer. I say that oscillation is 30 percent (maybe its too much, if someone has idea about it, could be nice). And I estimate frequency as 300 Hz.

    thickness of transducer 0.203 mm
    maximum volume deflection : 13.64 cubic milimeter
    maximum deflection in center:0.1798 mm
    surface area : 227.57
    after oscillation,
    volume deflection : 4.1 cubic milimeter (V1-V2)
    maximum deflection in center: 0.1798 mm
    Surface area : 227.54 mm2

    My problem is how I can define the velocity then?

    V(t) = (V1-V2) sin(wt) w= 2 pi f t I think according to formula t means time; f frequency;
    how i can define the time when frequency is 300 Hz?

    On the other hand does frequency different when Diapghram is in V1 position or V2 Position.

    After defining V here I can define volume flow rate Q =dV/dt m3/sn
    Q= A.c

    Here c shows velocity and I can calculate pressure loses then.

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Jul 16, 2015 #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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