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The perfect pump

  1. Oct 1, 2005 #1
    how would you make 1000 tons of water go all the way up 10 km and then down again with no friction?

    have you heard about a tiphon? your toilet has one, you would make use of that principle if you wanted to take gas from a car deposit with a plastic tube

    with an ideal fluid you could make the tube go 10 km up and move all the fluid you wanted up always that the end of the tube is lower than the level of water where the other end of the tube is

    now imagine that in the top of the 10 km tiphon you trick the system and divide the tube in two, one which goes down again ending one meter below the level of water but the other that lets half of the water up not letting air come through the tube so the tiphon keeps alive

    for what i have studied as long as density*gravity*height is higher in one end of the tube the fluid will move but it doesnt talk about mass so the fluid would not be noticing the splitting in two of the tubes at the top keepeng constant the variables that count but not the mass that doesnt count in the equation

    im really anxious to ask my teacher of fluid mechanics about this but am i missing something?

    the key would be not letting air entering in the stealing top tube what may not be posible

    by the way if you havent noticed this is not posible because then you could move 500ton 10 km up by moving 500 tons 1 meter down but why not
  2. jcsd
  3. Oct 2, 2005 #2


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    Science Advisor

    You missed one glaring thing: In the real world, there is ALWAYS friction. If something is flowing, there is friction.
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