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Please help me with the Reynolds number equation

  1. Mar 25, 2014 #1
    1. The problem statement, all variables and given/known data

    Substance water
    Temperature 60 degrees c
    Density 983kg
    Pipe size 10"
    Flow rate 10 m/s
    Abs viscosity 432 centipoise

    2. Relevant equations



    3. The attempt at a solution

    (Velocity of fluid or flow rate ) (diameter of pipe) divided by (viscosity of fluid)

    (10)(10)(983) divided by (432) = 227.546
     
  2. jcsd
  3. Mar 25, 2014 #2

    SteamKing

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    The Reynolds No. is non dimensional. Is your calculation of Reynolds No. non-dimensional? What kind of viscosity is used to calculate Reynolds No.? Have you used the correct viscosity?
     
  4. Mar 25, 2014 #3
    This is all that was on the assignment

    Refer to the Reynolds Number Equation and answer the following questions:
    1. Which is more turbulent – Fluid A or Fluid B? Explain your answer?

    Fluid a
    Substance water
    Temperature 60 degrees c
    Density 983 kg
    Pipe size 10"
    Flow rate 10
    Abs viscosity 432 centipoise

    (10)(10)(983) divided by(432) = 227.546

    Fluid b
    Substance crude oil
    Temp 60 degrees
    Density 915kg
    Pipe size 10"
    Flow rate 10 m/s
    Abs viscosity 450 centipoise
    (10)(10)(915) divided by 450 = 203.333
     
    Last edited: Mar 25, 2014
  5. Mar 25, 2014 #4

    AlephZero

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    You are mixing up different units here. If you are working in SI, the pipe size (diameter?) and viscosity given in the question are not in SI units.
     
  6. Mar 25, 2014 #5

    SteamKing

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    Like AlephZero stated, you must check these things out. Not all your problems will be simple plug-and-chug calculations. You must think about what the formulas mean and always pay attention to using the proper units.
     
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