Leaping shampoo glides on a lubricating air layer

S. Lee, Erqiang Li, Jeremy Marston, A. Bonito, Sigurdur T Thoroddsen

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


When a stream of shampoo is fed onto a pool in one's hand, a jet can leap sideways or rebound from the liquid surface in an intriguing phenomenon known as the Kaye effect. Earlier studies have debated whether non-Newtonian effects are the underlying cause of this phenomenon, making the jet glide on top of a shear-thinning liquid layer, or whether an entrained air layer is responsible. Herein we show unambiguously that the jet slides on a lubricating air layer. We identify this layer by looking through the pool liquid and observing its rupture into fine bubbles. The resulting microbubble sizes suggest this air layer is of submicron thickness. This thickness estimate is also supported by the tangential deceleration of the jet during the rebounding.
Original languageEnglish (US)
JournalPhysical Review E
Issue number6
StatePublished - Jun 10 2013

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KAUST Repository Item: Exported on 2020-10-01


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