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Homework Help: Mass flow rate

  1. May 9, 2013 #1
    1. The problem statement, all variables and given/known data

    Work out the mass flow rate of Nitrogen travelling through a at 0.3m^3/s if the pressure is 1 bar and the temperature is 18°C and the ideal gas constant is 8314 J/Kg K

    2. Relevant equations


    m = mass flow rate
    ρ= density
    V = velocity
    A = flow area

    PV = nRT

    P = pressure
    V = volume
    n = number of moles of gas
    R = gas constant
    T = absolute temperature

    3. The attempt at a solution

    I'm going round and round in a circle with it, the formula is simple enough and I know how to re-arrange it to get density but I need to work out the volume which is:

    V = nRT/P

    in order to do this I need to find the number of moles which is:

    mass of the gas/ molecular mass

    how do I work out the mass of the gas?

    and how do I work out the flow area when there isn't one provided?

  2. jcsd
  3. May 9, 2013 #2


    User Avatar
    Homework Helper

    You are given the volumetric flow rate in m^3/s which is given by:

    Volumetric flow rate = velocity * flow area.

    Using this, you will not need the area
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