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Homework Help: Mass flow rate

  1. Apr 28, 2009 #1
    1. The problem statement, all variables and given/known data
    A fluid of density 867 kg/m3 flows through a circular duct of diameter 40.60 mm with a mass flow rate of 14.63 kg/s. The fluid velocity in m/s is?

    2. Relevant equations
    mass flow rate [kg/s] = density [kg/m3] x velocity [m/s] x area [m]

    3. The attempt at a solution
    14.63 = 867 x velocity [m/s] x pi(40.60/2000)^2

    therefore: velocity = 13.03 m/s

    Though from my notes:
    Correct Answer: 1.190 m/s

    Am I doing something wrong or is the answer from my notes just wrong?

    Thanks in advance!
  2. jcsd
  3. Apr 28, 2009 #2


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    Science Advisor
    Homework Helper

    I get the same answer as you.
    14.63 kg/s / 867 kg/m^3 = 0.0168 m^3/s
    Area = 0.0013 m^2
    So flow rate = 0.0168 m^3/s / 0.0013 m^2 = 13 m/s
  4. Apr 28, 2009 #3
    Allright, thank you! Should be a mistake in the notes then.
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