Faraday waves, also known as Faraday ripples, named after
Michael Faraday (1791–1867), are
nonlinearstanding waves that appear on liquids enclosed by a vibrating receptacle. When the vibration frequency exceeds a critical value, the flat hydrostatic surface becomes unstable. This is known as the Faraday
instability. Faraday first described them in an appendix to an article in the Philosophical Transactions of the
Royal Society of London in 1831.[1][2]
If a layer of liquid is placed on top of a vertically oscillating piston, a pattern of
standing waves appears which oscillates at half the driving frequency, given certain criteria of
instability.[3] This relates to the problem of
parametric resonance. The waves can take the form of stripes, close-packed
hexagons, or even
squares or
quasiperiodic patterns. Faraday waves are commonly observed as fine stripes on the surface of wine in a
wine glass that is ringing like a bell. Faraday waves also explain the 'fountain' phenomenon on a
singing bowl.
Faraday waves are used as a liquid-based template for directed assembly of microscale materials including
soft matter,
rigid bodies, biological entities (e.g., individual cells, cell spheroids and cell-seeded
microcarrier beads).[5] Unlike solid-based template, this liquid-based template can be dynamically changed by tuning vibrational frequency and acceleration and generate diverse sets of symmetrical and periodic patterns.
This phenomenon is also used by alligators to call mates. They vibrate their lungs at low frequencies slightly below the surface, causing their spikes to move and induce surface waves. These surface waves are basically Faraday waves and one can observe the splashing effect characteristic of certain resonances.[6][7]
This effect can also be used for mixing two liquids acoustically. Faraday waves form on the interface between the two liquids, which increases the surface area between the two, rapidly and thoroughly mixing the liquids.[8]
^Faraday, M. (1831) "On a peculiar class of acoustical figures; and on certain forms assumed by a group of particles upon vibrating elastic surfaces", Philosophical Transactions of the Royal Society (London), vol. 121, pp. 299–318. "Faraday waves" are discussed in an appendix to the article,
"On the forms and states assumed by fluids in contact with vibrating elastic surfaces". This entire article is also available on-line (albeit without illustrations) at
"Electronic Library".
^Moriarty, Peter; Holt, R. Glynn (2011). "Faraday waves produced by periodic substrates: Mimicking the alligator water dance". The Journal of the Acoustical Society of America. 129 (4): 2411.
Bibcode:
2011ASAJ..129.2411M.
doi:
10.1121/1.3587858.