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Hydraulic - flow inside a pipe, how to know the direction?

  1. Jun 21, 2011 #1
    hydraulic -- flow inside a pipe, how to know the direction?

    if you have a flow inside a pipe, how to know the direction?
     
  2. jcsd
  3. Jun 21, 2011 #2

    tiny-tim

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    welcome to pf!

    hi amrfd! welcome to pf! :smile:

    google "non invasive flow monitor" :wink:

    (i think they all use the doppler effect)​
     
  4. Jun 21, 2011 #3
    Re: welcome to pf!

    thank you for your reply but what do you mean with doppler effect?
     
  5. Jun 21, 2011 #4

    tiny-tim

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    they bounce ultrasound off the water, and measure the change in frequency of the sound …

    do that google search, and you'll find out how :wink:
     
  6. Jun 21, 2011 #5
    Re: hydraulic

    thank you very much
    if i don't have this device,is there another way to know the direction of flow?
     
  7. Jun 21, 2011 #6

    tiny-tim

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    i doubt there's anything cheaper :redface:

    (that doesn't involve cutting a hole in the pipe)
     
  8. Jun 22, 2011 #7
    Re: hydraulic

    Are you asking from a practical perspective or just for information?

    There should be a drop in pressure the further from the source you go (as long as there is flow).

    Could also cause local turbulence in the line with a small "wall" and put sensors behind and in front of the wall. The wall is causing the turbulence - would see pressure differential as long as there is flow. Think about an airplane wing and pressure differential top to bottom - only sideways :)

    (I'm no expert - but this is a fun thought experiment!)
     
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