Sprinkler Head Revisited: Momentum, Forces, and Flows in Machian Propulsion

  title={Sprinkler Head Revisited: Momentum, Forces, and Flows in Machian Propulsion},
  author={Alejandro Jenkins},
  journal={European Journal of Physics},
  • Alejandro Jenkins
  • Published 2011
  • Physics
  • European Journal of Physics
  • Many experimenters, starting with Ernst Mach in 1883, have reported that if a device alternately sucks in and then expels a surrounding fluid, it moves in the same direction as if it only expelled fluid. This surprising phenomenon, which we call Machian propulsion, is explained by conservation of momentum: the outflow efficiently transfers momentum away from the device and into the surrounding medium, while the inflow can do so only by viscous diffusion. However, many previous theoretical… CONTINUE READING

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