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Homework Help: Fluid Mechanics-pipe flow

  1. Apr 19, 2010 #1
    1. The problem statement, all variables and given/known data

    Oil must be transported over a distance L through a horizontal pipe at volume flow rate of Q, using a pump with power W. Find the minimum pipe diameter, D, which guarantees the exit pressure of Pe.


    Common values:

    sigma=(pipe roughness) = 0.05 mm
    pi=(pressure at the inlet of the pump) = 10 kPa gauge,
    rho=(kinematic viscosity) = 4 X 10-6 m2/s
    gamma=(specific weight) = 7 kN/m3
    L =
    Q =
    W =
    Pe


    2. Relevant equations

    Colebrook Equation

    3. The attempt at a solution

    W=will dictate what pump outlet pressure you can have for specified Q. L will dictate how developed the flow will be among other things, and the Overall D along with Q and viscosity will dictate the Re Number. You are able to adjust D, so for a specified Q would could have a Laminar, transient , or turbulent flow. I am assuming that since he whats us to use friction factor calculations for turbulent flow you will have to choose a Q and D that result in a Turbulent flow not laminar.

    I've got an idea of where to go with this, but I am a bit stuck at the moment. Thank you for any help I may get..
     
    Last edited: Apr 19, 2010
  2. jcsd
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