May 17, 2015
“Part of the messiness caused by male urination is due to a phenomenon called Plateau-Rayleigh instability.” http://t.co/DkpyMhjG5B
— Van der Mensbrugghe (@Mensbrugghe) November 7, 2013
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“Part of the messiness caused by male urination is due to a phenomenon called Plateau-Rayleigh instability.” http://t.co/DkpyMhjG5B
— Van der Mensbrugghe (@Mensbrugghe) November 7, 2013
A Singularity inside a Singularity; Splitting a water drop during pinch-off of an oil drop. When a fluid droplet breaks-off from a thinning fluid thread, the thickness of the fluid neck becomes vanishingly small at the point of snap-off leading to a singularity. The snap-off mechanism is driven by surface tension forces - surface tension reduces the surface area by decreasing the thickness of the fluid thread.
We add surfactants to the aqueous dispersed phase to generate ultra-low surface tension inner drops that are encapsulated inside of oil drops with a microfluidic device. As the outer oil drop pinches off, due to the Plateau-Rayleigh instability, a trapped water drop inside the oil neck deforms and stretches before splitting into two. (Gif and emulsion credits: L. L. A. Adams)