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Fluid Mechanics - Venturimeter

  1. Feb 22, 2010 #1
    1. The problem statement, all variables and given/known data
    A horizontal venturimeter is used to measure the flow rate of an oil having density 940kgm-3 in a 16cm diameter pipe. The throat diameter of the venturimeter is 8cm with a discharge coefficient of 0.96. The pressure at inlet is 70kPa and it is required that the pressure at any point should not drop below 55kPa absolute. Find the maximum flow rate for which the meter may be used.

    What happens if an oil having a density less than 940kgm-3 flows instead?
    Take atmospheric pressure as 1.01 bar.

    ρ = 940 Kgm-3
    A1 = (π〖(16×〖10〗^(-2))〗^2)/4= 0.0201m2
    A2 = (π〖(8×〖10〗^(-2))〗^2)/4= 5.0265×10-3 m2
    Cd = 0.96
    P1 = 70KPa (Gauge) = 171KPa (Abs)
    P2 = 55KPa (Abs) = -46KPa (Gauge)
    ΔP = 116KPa
    Q = ?? Find Maximum.

    3. The attempt at a solution

    For attempt and equation please see attachment 1.

    Please if anyone could look over this and give me an idea if it is correct or where i have gone wrong it would be most grateful.

    If the fluid was less than the flow would be greater is this correct?

    Many Thanks

    Attached Files:

    • 1.jpg
      File size:
      7.8 KB
  2. jcsd
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