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A simple real-world fluid dynamics question:

  1. Oct 24, 2004 #1
    It's not so simple to me being that I have no background in fluid dynamics, but it seems like it would be fairly simple for most mechanical engineers; anyway:

    This is to help me with the design of my charge pipes in my custom turbocharger setup. Assuming a constant radius throughout, which would be more restrictive to the compressed air?

    1) One 90 degree bend followed by a straight pipe followed by one more 90 degree bend.

    2) One 90 degree bend followed by a straight pipe followed by a 45 degree bend followed by more straight pipe and followed by one more 45 degree bend.

    3) One 135 degree bend followed by a straight pipe followed by one 45 degree bend.

    Thanks for anybody's input.
     
  2. jcsd
  3. Oct 25, 2004 #2

    enigma

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    It's not a simple problem.

    Is the total turn 180 degrees, or are you merely shifting the flow over a bit (doing a +90 followed by a -90 e.g.)?

    What diameter pipe? What pressure, temperature, etc.? How long is the straight pipe?
     
  4. Oct 25, 2004 #3
    Hmm, I guess it's not as simple as I imagined.

    The details you asked for:

    It will be a full 180 degree turn

    2.5" diameter pipe, approximately 70 degrees F., approximately 8 lb/in^2, the straight pipes inbetween the bends would be about 6" max.
     
  5. Oct 25, 2004 #4
    The best possible choice would definitely be a U-shaped pipe.
    Neither of the ones u mentioned cos u wanna change its direction by a full 180 degrees.
     
  6. Oct 25, 2004 #5
    Unfortunately, a full 180 degree bend is not possible b/c of space constraints.
     
  7. Oct 25, 2004 #6

    enigma

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    In that case, you will want the turns to be as smooth as possible.

    Keep all hard edges out of it if at all possible.
     
  8. Oct 25, 2004 #7

    They will all be mandrel bends.
     
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