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Thursday, October 27, 2011

Fluid Dynamics In Slo-Mo: Liquid Rings

Scientists are uploading their pre-print papers and attached videos to the well known site ArXiv.  A paper and video that I found today will be presented at the 64th Annual Meeting of the APS Division of Fluid Dynamics in Baltimore, Maryland, November 20-22, 2011.  A couple of weeks from now.
Seungho Kim and Ho-Young Kim have put together some fabulous work on fluid dynamics.
The icing on the cake?
Their video presentation is absolutely stunning.

Water droplets are being used with an "annulus" (which is just latin for "ring").  This is not the "Liquid Ring" the scientists are referring to though.  The materials they're using are either "Superhydrophobic" (extremely difficult to wet) or the opposite, "Superhydrophilic,"
Explained much better than I ever could, these 2 terms are easily made clear with this portion of another paper's abstract:

"The term superhydrophobicity was introduced in 1996 to describe water-repellent fractal surfaces, made of a hydrophobic material, on which water drops remain as almost perfect spheres and roll off such surfaces leaving no residue.......  The terms superhydrophilicity and superwetting were introduced a few years after the term superhydrophobicity to describe the complete spreading of water or liquid on substrates." (paper cited at bottom)

So what is a Liquid Ring?
In this case, the breaking apart of the cohesive liquid volume leaves a trail behind it on the annulus: a liquid ring.
At one point, volume decreases via evaporation, breaking apart the unity of the droplet.  This critical point at which it breaks is food for thought in of itself.  I imagine there being boatload of math behind that alone.

Fluid dynamics is one of the more beautiful fields in science, ESPECIALLY now that we have ultra-slo-mo cameras.  

There was no audio, so I took the liberty of putting one of my old original ambient songs in there.  Hope you like it!  Oh, and don't ask me about them mentioning popcorn, I have no clue.

Read their paper here on ArXiv.  You can even download a hi-res version of the movie yourself while you're there.  It won't have my music in it though.

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Seungho Kim, & Ho-Young Kim (2011). Liquid ring arXiv arXiv: 1110.3703v1

Drelich J, & Chibowski E (2010). Superhydrophilic and superwetting surfaces: definition and mechanisms of control. Langmuir : the ACS journal of surfaces and colloids, 26 (24), 18621-3 PMID: 21090661


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