AAPT Abstract Archive

Abstract Information

  Session: The Wonderful World of AJP
  Paper Type: Invited
  Title: The Puzzle of the Steady-state Rotation of a Reverse Sprinkler
  Meeting: 2016 Winter Meeting: New Orleans, Louisiana
  Location: N/A
  Time: 10:00AM
  Author: Wolfgang Rueckner, Harvard University
617-495-5360, rueckner@fas.harvard.edu
  Co-Author(s): None
  Abstract: 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.
  Footnotes: None
  Presentation: reverse sprinkler.pdf

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