J C Martinez et al 2006 Eur. J. Phys. 27 805 doi:10.1088/0143-0807/27/4/012
J C Martinez1, E Polatdemir2, Ankita Bansal3, Wang Yifeng4 and Wang Shengtao4
Show affiliationsWe study the dynamics of a spinning sphere whose south pole is in touch with the surface of a still body of liquid. When the sphere is turning fast enough, the fluid rises up the sphere, reaches the equator and is flung out as a fountain of droplets. Although the fountain forms for water a weakly viscous fluid, and for propylene glycol a much more viscous fluid, the dynamical situation is different for each. For flows at mid-latitudes on the sphere, we formulate the dynamical equations for the two liquids in terms of Newton's law in a rotating frame, noting that the Coriolis force plays an essential role in both liquids, and obtain qualitative agreement with observations. We also discuss the possible roles played by other forces.
47.32.Ef Rotating and swirling flows
Issue 4 (July 2006)
Received 20 February 2006
Published 8 May 2006
J C Martinez et al 2006 Eur. J. Phys. 27 805
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