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Hydraulics, Flow rate from Bernoulli Equation

  1. Dec 30, 2011 #1
    1. The problem statement, all variables and given/known data
    Flow rate in Venturi meter of Petrol (SG 0.85).

    Diam1 - 0.2m Diam2 - 0.15m

    Height Diff in manometer of Mercury (SG 13.6) 0.012m, so Δp= 13600 x 9.81 x 0.012 = 1601?

    Cd = 0.98

    2. Relevant equations
    Bernoulli,
    p/ρg + U2/2g + Z

    U=Q/A


    3. The attempt at a solution

    Inserting and equating the values into bernoulli i ended up with,

    0.192 = Q22/0.093 - Q12/0.058

    Not sure if this i right because i can't seem to go anywhere from here.

    THE GIVEN ANSWER IS 39.3 l/s

    Thanks a lot for any help.
     
    Last edited: Dec 30, 2011
  2. jcsd
  3. Dec 30, 2011 #2
    Q1 equals Q2. How are the numbers 0.093 and 0.058 computed?
     
  4. Dec 30, 2011 #3
    They are calculated from 2g x A after subbing u for Q/A.
     
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