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Pressure drop along a tube of unkown length containing turbulent flow

  1. Apr 18, 2007 #1
    How do u calc pressure at each end of pipe if u know its turbulent and u don't know the length.

    Just got viscosity, density, temp diff at one end, D.

    Cheers.
     
  2. jcsd
  3. Apr 18, 2007 #2
    hmm... Things I am thinking include:

    what is your fluid?
    How does it's density change with temperature?
    what is your mass/volumetric flow rate?
    Can you make any assumptions about either the inlet or outlet pressure?
    How did you calculate your Re to determine turbulence without a velocity?
     
  4. Apr 18, 2007 #3

    Q_Goest

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  5. Apr 19, 2007 #4
    what is your fluid?
    How does it's density change with temperature?
    what is your mass/volumetric flow rate?
    Can you make any assumptions about either the inlet or outlet pressure?
    How did you calculate your Re to determine turbulence without a velocity?

    the fluid is an oil.
    density is assumed constant.
    u've got mass flow rate.
    Not sure about assumptions.
    Calc Re from mass flow rate.
    The only thing involving temp which i hav no idea what its influence is.. is theres a difference in temp at one end of the pipe of like 45K.
    u know viscosity is half the value at other end.

    What formulas would i need to use and does it involve iterating.
    And u want pressure gradient ratio of two ends.
     
  6. Apr 19, 2007 #5
    I would use a non dimensionalized Navier Stokes to solve for this sort of thing, but with the case that you are speaking involving temperature gradients, I might suggest using Femlab to do this sort of thing.
     
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