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Communicating vases, maximum height before rest (water in pipes)

  1. Jul 1, 2015 #1
    I do not know much about computers too (not really true but I am not really up to date), I do not know if I am doing what I am supposed to, here is my first simple question:
    Two connected pipes, equal diameter (internal) 100 mm, same height (2200 mm), I have water in one pipe at 2000 mm, in the receiving pipe I have the water level at 1000 mm, I open the valve (does not interfere with the computation), at what level will the water arrive ? (maximum height, I know that the equilibrium level is going to be at 1500 mm, not completely senile.). What happens if I double the height? What Happens if I increase the diameter? I tried to apply every equation I could find (but not always understood), applied common sense, and I even did a test with a smaller diameter pipe, and all results were different or not possible. The pipe is PVC40.
    If someone out there can help me it would be great. Thanks
  2. jcsd
  3. Jul 1, 2015 #2


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    I am having difficulty visualizing your set-up. Are the pipes vertical with the valve connector at the bottom? If so, what is the size of the valve? Would it be possible to show a picture?
  4. Jul 1, 2015 #3
    sorry vertical pipes, no worry about the valve as such is just a way like another to have the vases starting at different levels but not important for the friction or calculation), I do not have a picture but basically is a U formed by two pipes, all sizes the same (diameter), I do not know if the the length of the connecting pipe has any thing to do, but I do not know much. Also will a normal L shaped elbow (two of course) (90) have worst or better results of a more shapely 120? Basically the full side drops the level for 1000 mm (with no resistance or friction), we also know that the equilibrium level is 1,500 mm. The point is to know how much higher of this equilibrium level will the water go (and how low it will go in the starting pipe). It is like a water based pendulum that does not have a return, just a one way trip. Hope was helpful and thanks for the inquiry.
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