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Gauge pressure/flow velocity

  1. Mar 29, 2009 #1
    1. The problem statement, all variables and given/known data
    Water at a gauge pressure of 3.8 atm at street level flows into an office building at a speed of 0.80 m/s through a pipe 5.4 cm in diameter. The pipe tapers down to 2.6 cm in diameter by the top floor, 20 m above (see figure here http://www.uploadgeek.com/share-85DD_49B54943.html [Broken]). Assume no branch pipes and ignore viscosity.
    A). Calculate the flow velocity in the pipe on the top floor.
    I have this, its 3.450887574 m/s

    B).Calculate the gauge pressure in the pipe on the top floor.
    *****Figured it out, I wasn't tracking units.*****

    2. Relevant equations
    I have been trying to use Bernoulli's equation. P1+(.5 pv12)+(pgy1) = P2+(.5 pv22)+(pgy2)

    3. The attempt at a solution
    So far solving for P2 in Bernoulli's equation and dividing by 101300(pa/atm). I have come up with 1.990429541 atm. for my answer. Unfortunately this is wrong, help would be greatly appreciated.
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Mar 29, 2009 #2

    rl.bhat

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    Homework Helper

    So far solving for P2 in Bernoulli's equation and dividing by 101300(pa/atm). I have come up with 1.990429541 atm. for my answer. Unfortunately this is wrong, help would be greatly appreciate

    Show your calculations.
     
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