Fluid pipe

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Fluid pipes are a phenomenon driven by surface tension. When a pure water jet impinges on a reservoir, capillary waves are excited and propagate up the jet at the same speed that the jet falls.

Fluid pipe phenomenon may be observed with a kitchen faucet. When the diameter of the stream is 2–3 mm, placing an obstacle in the stream will give the desired effect.[1] Contamination of the reservoir with a surfactant will eliminate the effect of capillary waves up a fluid pipe and results in the jet entering the reservoir as a rigid pipe.[1]


  1. ^ a b Hancock, Matthew J.; Bush, John W. M. (2002-09-01). "Fluid pipes". Journal of Fluid Mechanics. 466: 285–304. doi:10.1017/S0022112002001258. ISSN 1469-7645. 
  • A related thesis was written by Hancock, M.J. and Bush, and presented J.W.M., 2002. Fluid pipes, J. Fluid Mech., 466, 285-304.