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Air pressure and velocity in a pipe

  1. Apr 5, 2012 #1
    This is NOT homework. The fan is a Crary Fan and the hose is Oregon PU used to distribute particles. I have tried a number of 'online' calculation sites but they return either conflicting results or 'infinite' values!!!!

    Dear All

    I am trying to determine / estimate the expected air velocity and pressure at the end of a 5m long hose, supplied by a centrifugal fan coupled directly onto the hose. The information / assumptions i have are;

    Fan System
    Static Pressure: 4kPa
    Volumetric Flow: 40m3/min

    Length: 5m
    Diameter: 110mm
    Roughness: 0.05mm
    Minor Loss Coef: 0.1

    Temp: 15°c
    Density: 1.1 kg/m3
    Kinematic Viscosity: 10 E-6 m2/s

    From this is it possible to estimate the velocity of the air stream at the start of the hose and at the and (v1 & v2) and the associated pressures (p1 & p2)? If it is ,what are the calculations?

    I assume that due to the resistance caused by the pipe there will exist a 'back pressure' in the pipe. What would this pressure be 1m from the fan outlet (1m down the pipe).

  2. jcsd
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