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Calculate h if the fluid in the manometer is mercury

  1. Feb 27, 2013 #1
    1. The problem statement, all variables and given/known data

    A venture flow-meter can be designed as
    shown in the figure. At position 1 the
    velocity is 0.5 m/s, and pressure is 1.3 bar.
    The cross section area at 1 is two times the
    area at 2. The fluid inside the manometer
    has a density ρ, and the fluid column has a
    high h as shown in the figure.
    Assume the temperature is 20oC,
    conducting the following analysis:
    1) Derive the equation h as a function
    of ρ.
    2) Calculate h if the fluid in the
    manometer is mercury

    Picture is attached.

    To be honest, I have no idea what I'm suppose to do. Please help.

    Attached Files:

  2. jcsd
  3. Feb 27, 2013 #2


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    Staff Emeritus
    Science Advisor
    Homework Helper

    Re: Thermodynamics

    It's actually a 'venturi' flow meter.

    Hint: apply Bernoulli's theorem to the flow.
  4. Feb 27, 2013 #3
    Re: Thermodynamics

    So the flow meter would have the equation of the Bernoulli's Equation for fluids and the manometer would have the equation deltaP=rho*g*h. But how would I find the equation with those two separate one?
    Last edited: Feb 27, 2013
  5. Feb 27, 2013 #4
    Re: Thermodynamics

    You need to use the Bernoulli equation to calculate the pressure difference between the two points in the flow. Then you need to use the hydrostatic equation to determine the difference in height in the manometer for the calculated pressure difference.
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