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Homework Help: Head loss at venturi meter

  1. Apr 12, 2016 #1
    1. The problem statement, all variables and given/known data
    A venturi meter is being calibrated horizontally and has a diameter of 75mm at the entrance and 50mm at the throat . The flow rate is obtained by measuring the time required to collect certain amount of water . The average number of measurement gives 0.614m^3 of water in 55.82 second . If the pressure gauge at the inlet reads 20kN/ (m^2) more than the throat , calculate the head loss due to friction using Bernoulli's equation

    2. Relevant equations

    3. The attempt at a solution
    for the first step , i have use the special formula(refer to the second and third attachment) to find the therorical velocity at point 2 ( assume no energy loss) , so , i got V2 = 7.07m/s

    then i found the real flow rate = 0.011(m^3) / s

    assuming no loss at point 1 , i equate A2V2 = A1V1
    so , i got V1= 3.14m/s
    then substitute all the values that i found into the Bernoulli's equation , i found the head loss . Is my working correct ? I dont have the answer with me.

    Attached Files:

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  2. jcsd
  3. Apr 12, 2016 #2
    is the actual flow rate = 0.614/55.82 = 0.011(m^3) / s ?
  4. Apr 24, 2016 #3
    anyone can try to reply ?
  5. May 18, 2016 #4
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