Session:
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The Wonderful World of AJP
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Paper Type:
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Invited
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Title:
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The Puzzle of the Steady-state Rotation of a Reverse Sprinkler
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Meeting:
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2016 Winter Meeting: New Orleans, Louisiana |
Location:
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N/A |
Date:
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Time:
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10:00AM
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Author:
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Wolfgang Rueckner, Harvard University
617-495-5360, rueckner@fas.harvard.edu
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Co-Author(s):
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None
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Abstract:
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The continuous rotation of the reverse sprinkler has been a puzzle for over two decades. We present a series of experiments that demonstrate that a properly designed reverse sprinkler experiences no steady-state torque and does not rotate. If any sustained rotation of the reverse sprinkler occurs, it is because a force couple produces a torque accompanied by vortex flow inside the body of the sprinkler. No steady-state rotation occurs if the vortex is suppressed or prevented from forming in the first place.
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Footnotes:
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None
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Presentation:
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reverse sprinkler.pdf
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