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Homework Help: How do you calculate the mass flow rate, volume flow rate and velocity

  1. Jan 19, 2014 #1
    How do you calculate the mass flow rate, volume flow rate and velocity of a 6 bar compressed air supply through a 2mm tube? This is all the information I have been given. Is there any theory that could help me here? I can't seem to find much on the internet, so I have no clue where to begin, sorry.

  2. jcsd
  3. Jan 19, 2014 #2


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    This is a problem for fluid mechanics, specifically gas dynamics. However, the information you have given is insufficient to solve your problem as stated.
  4. Jan 19, 2014 #3
    If this is all data you have been given, you are expected to make several simplifications.

    1.) Velocity equals mach 1 at given condition (if temperature is not given i'd take 288.15 K as this is standard at 0m ISA conditions)

    2.) There is no pressure drop (as you cannot calculate it due to lack of data on tubes length and roughness)

    So: volume_flow=speed_of_sound*(2*pi*(tube_radius˄2))
    mass_flow= volume_flow*air_density
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