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Fluid mechanics question help?

  1. Sep 24, 2013 #1
    fluid mechanics question help!?

    1. The problem statement, all variables and given/known data

    Air flows through a horizontal duct of dimensions 300 x 300 mm with a velocity of 15 m/s. At position (1) in the duct a water guage (water manometer) registers a hieght of 215mm. The duct bends downwards and reduces in size to 240 x 240 mm, dropping a distance of 12 m to position (2). the specific volume of the air is 0.85 m^3 / kg and this may be taken as constant. Determine:

    a) volume flow rate and mass flow rate.
    b) pressure at (1) in kPa
    c) The Velocity at (2)
    d) pressure at (2) in kPa (guage) and mm water guage if losses are neglected.
    e) pressure at (2) in kPa (guage and mm water guage if losses are 10% of the total head at (1) and elevation (2) is used as datum


    2. Relevant equations

    Bernoulli's Equation

    mass flow rate = v A relative density

    3. The attempt at a solution

    im struggling guys
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
    Last edited: Sep 24, 2013
  2. jcsd
  3. Sep 24, 2013 #2

    SteamKing

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    I'm not surprised that you're struggling. Are you sure that the water gauge at point 1 reads 215 m? That's a pretty large water gauge, equal to the height of a 70 story building. BTW, atmospheric pressure is about 10 m W.G.
     
  4. Sep 24, 2013 #3
    haha its mm. silly me :/
     
  5. Sep 24, 2013 #4

    SteamKing

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    You've got to show some effort to get help from PFers. That's the rules. "I'm struggling" isn't good enough.
     
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