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Fluid under centrifugal force (Basic)

  1. Sep 14, 2009 #1
    Hi,

    What happens to the fluid in a cylinder that is spinned around it's central axis? Would it matter if there would be a bit of air?

    Thanks very much,
    Alex
     
    Last edited: Sep 14, 2009
  2. jcsd
  3. Sep 14, 2009 #2
    Depending on how fast you rotate the cylinder, the shape of the surface will approach that of a paraboloid of revolution.

    Thanks
    Matt
     
  4. Sep 14, 2009 #3
    Hey,

    Thanks for the info, but i think i was a bit unclear, as I was meaning that the cylinder is rolling. Forgot that the direction of it will make a difference.

    Any ideas about that?
     
  5. Sep 15, 2009 #4
    I don't have the math to back this up, but something's nagging at the back of my head to suggest you're more likely to get a catenary rather than a parabola. I Could be totally wrong on this... Anyone know for sure?
     
  6. Sep 16, 2009 #5
    Check out "Transport Phenomena" by Bird, Stewart, and Lightfoot.

    If the fluid surface is exposed to atmospheric pressure (14.696 psi) then the shape will be a paraboloid of revolution.

    Thanks
    Matt
     
  7. Sep 16, 2009 #6
    Why the need for atmospheric pressure? A fluid spun in a rotationally will form a parabola in a vacuum, why is this necessary for the rolling cylinder?
     
  8. Sep 17, 2009 #7
    Yes, a fluid under vacuum will produce the same result. I was just stating the conditions used in the Transport Phenomena book for clarity.

    Thanks
    Matt
     
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