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Thanks Tommya300 for the link. Among several I have read, your link is a good one for describing centrifugal separation in which solids are spun to the outside of a spinning mass of water or air. My puzzle is a situation in which the solids are drawn to the center of the whirlpool.Tommya and Yor_on, you might get some insight by watching this phenomenon. In your kitchen take a pot or small kettle (round, straight sides and flat bottom), fill partway with water, add a pinch of uncooked instant oatmeal and/or rice (or whatever, as long as it sinks), and stir it with a spoon and then watch. As the swirling water slows down, the heavier than water particles move to the center and remain there when the swirl stops instead of spinning to the outside edges of the pot as might be expected.Compared to the big questions asked on this forum my question is pretty mundane. I am hoping someone will come up with the unexciting forces at work in my beer pot. Steve
http://en.wikipedia.org/wiki/Tea_leaf_paradox - I think this is the best explanation I can find.