Building water bridges in air: Electrohydrodynamics of the floating water bridge

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Abstract

The interaction of electrical fields and liquids can lead to a phenomenon that defies intuition. Some famous examples can be found in electrohydrodynamics as Taylor cones, whipping jets, or noncoalescing drops. A less famous example is the floating water bridge: a slender thread of water held between two glass beakers in which a high voltage difference is applied. Surprisingly, the water bridge defies gravity even when the beakers are separated at distances up to 2 cm. In this paper, experimental measurements and simple models are proposed and discussed for the stability of the bridge and the source of the flow, revealing an important role of polarization forces on the stability of the water bridge. On the other hand, the observed flow can only be explained due to the non-negligible free charge present in the surface. In this sense, the floating water bridge can be considered as an extreme case of a leaky dielectric liquid [ J. R. Melcher and G. I. Taylor, Annu. Rev. Fluid Mech. 1, 111 (1969) ].
Original languageUndefined
Pages (from-to)122104-1-122104-9
Number of pages19
JournalPhysics of fluids
Volume22
Issue number12
DOIs
Publication statusPublished - 2010

Keywords

  • Jets
  • Capillarity
  • IR-79269
  • electrohydrodynamics
  • drops
  • flow visualisation
  • flow instability
  • water
  • METIS-271478
  • Two phase flow
  • Air

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