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Homework Help: Force Balance

  1. Jan 11, 2008 #1
    I would like to derive a relation for shear stress on a conical bore shaped fluid element. Essentially, I have flow going through a converging nozzle. I know variables in this include length of the nozzle, inlet and outlet diameters and pressures and nozzle angle.

    I've done a force balance on a cylindrical shaped fluid element. All I want to know is if I repeat the same procedure I used on that, how do I treat the shear forces that are acting on the angled part of the element? Is it simply taking the component acting along the same direction as the pressures?
  2. jcsd
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