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Fluid flow and momentum equation. Do I have the right equation?

  1. Oct 3, 2011 #1
    http://img89.imageshack.us/img89/3914/unled23g.png [Broken]


    F1x+F3x = density x Q(Vx2 – Vx1)
    F1x = -Rx
    F3x= (pressure 1 x area 1) + (Pressure 2 x area 2) (Cos B)
    F1y+F3y = density x Q(Vy2 – Vy1)
    F1y = -Ry
    F3y = (Pressure 2 + Area 2)(Cos B)
    So is it:
    Rx= (pressure 1 x area 1) + (Pressure 2 x area 2) (Cos B) - density x Q(Vx2 – Vx1)
    Ry = (Pressure 2 + Area 2)(Cos B) - PQ(Vy2 – Vy1)
     
    Last edited by a moderator: May 5, 2017
  2. jcsd
  3. Oct 3, 2011 #2
    For starters, I see that in two cases you are adding area to pressure. This cannot be done because units are different. You should label your diagram as to what is F and what is R.
     
  4. Oct 3, 2011 #3
    Last edited: Oct 3, 2011
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