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},
  pages={1213 - 1226}
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… 
New angles on the reverse sprinkler: Reconciling theory and experiment
The reverse sprinkler problem popularized in Richard Feynman's memoirs has long been a source of interest and controversy. Numerous theoretical and experimental studies have illuminated many
Irreversibility in an ideal fluid
When a real fluid is expelled quickly from a tube, it forms a jet separated from the surrounding fluid by a thin, turbulent layer. On the other hand, when the same fluid is sucked into the tube, it
Solid–fluid interaction: a continuum mechanics assessment
The dynamical interaction between solids and fluids is a subject of paramount importance in Mechanics with a wide range of applications to engineering problems. It is, however, still a challenging
Micropropulsion by an acoustic bubble for navigating microfluidic spaces.
This propulsion mechanism may be applied to microswimmers that navigate microfluidic environments and possibly narrow passages in human bodies to perform biosensing, drug delivery, imaging, and microsurgery.
J un 2 01 8 A physical approach to dissipation-induced instabilities
Self-oscillatory and self-rotatory process driven by non-conservative forces have usually been treated as applications of the concepts of Hopf bifurcation and limit cycle in the theory of
A physical approach to dissipation-induced instabilities.
Self-oscillatory and self-rotatory process driven by non-conservative forces have usually been treated as applications of the concepts of Hopf bifurcation and limit cycle in the theory of
The dynamics of slender cylinders in axial flow subject to conventional boundary conditions is recalled first. This is followed by brief reviews and discussion of new developments in (i) the dynamics
Mini and Micro Propulsion for Medical Swimmers
This paper reviews the recent ideas and developments of self-propelling devices, ranging from the millimeter scale down to the micro and even the nano scale, and focuses on various propulsion principles, including methods of utilizing smart actuators, external magnetic/electric/acoustic fields, bacteria, chemical reactions, etc.


An elementary treatment of the reverse sprinkler
We discuss the reverse sprinkler problem: How does a sprinkler turn when submerged and made to suck in water? We propose a solution that requires only a knowledge of mechanics and fluid dynamics at
Aspirating cantilevers and reverse sprinklers
The dynamics of a cantilevered pipe conveying fluid is discussed with a focus on the inverse problem, that is, when the pipe is aspirating rather than discharging fluid. The convoluted history of the
Fluid Mechanics
Ludwig Krinner (Dated: November 5th 2012) Abstract This is a script made with the help of Landau Lifshitz, Book VI [1] on fluid mechanics, that gives a short introduction to basic fluid mechanics.
The ‘acoustic scallop’: a bubble-powered actuator
The device described here consists of a millimeter-size tube immersed in a liquid, closed at one end, and partially filled with gas. A sound field in the liquid causes the gas volume to pulsate
The Feynman inverse sprinkler problem: A detailed kinematic study
This paper represents an extension of the results of an original paper on the subject [Am. J. Phys. 5 7, 654–657 (1989)]. Here an experiment, originally performed by Titcomb e t a l., to demonstrate
The flow-induced instability of long hanging pipes
The Feynman inverse sprinkler problem: A demonstration and quantitative analysis
The results of an experiment designed to illustrate the effects of hooking a common lawn sprinkler to a suction, rather than to a pressure, source are presented. The inverse sprinkler moves in a
In earlier theoretical work it has been found that cantilevered pipes aspirating fluid at their free end and conveying it toward the clamped end lose stability by flutter at infinitesimally small
Fluid Mechanics with Engineering Applications. 6th Ed. By R. L.DAUGHERTY and J. B. FRANZINI. McGraw-Hill. 1965. 574 pp. $9.95 or 80s. Fluid Dynamics. By J. W. DAILY and D. R. F. HARLEMAN. Addison Wesley. 1966. 454 pp. $12.50 or 94s.
Properties of fluids fluid statics basics of fluid flow energy considerations in steady flow momentum and forces in fluid flow similitude and dimensional analysis steady incomprehensible flow in