Freezing water drops
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Uploaded by droscarenriquez on Oct 18, 2011
Milton van Dyke award-winning entry at the 2012 Gallery of Fluid Motion!
In this video we show how a drop of water freezes into a pointy shape when deposited on a cold surface. The process of solidification can be observed very clearly due to the change in refraction when water turns into ice. The drop remains approximately spherical during most of the process, with a freezing front moving upwards and smoothly following the interface. However, at the final stage of freezing, when the last cap of liquid turns into ice, a singular tip develops spontaneously. Interestingly, the sharp tip of the ice drop acts as a preferential site for deposition of water vapour, and a beautiful "tree" of ice crystals develops right at the tip. This pointy tip attracts the water vapour in the same fashion as a sharp lightning rod attracts lightning.
Submitted to the Gallery of Fluid Motion 2012 by Oscar R. Enriquez, Alvaro G. Marin, Koen G. Winkels and Jacco H. Snoeijer
Physics of Fluids Group (PoF), University of Twente, The Netherlands
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MILTON VAN DYKE PRIZE 2011!!!
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cool
4 months ago 2
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Very well presented. Good luck at the competition.
ankitphd 4 months ago 2
@ankitphd Thanks!
droscarenriquez 4 months ago
Very nicely done - I like the mix of animation and videomicroscopy. How does the tree of ice crystals depend on Relative Humidity? What was RH for the expts in the movie?
GarethMcKinley 4 months ago
@GarethMcKinley ... and it was not clear that ice forms first on the tip. So we had to wait for humidity in the Netherlands to drop... On the day we recorded the expts in the movie, RH was < 40%. That's a lot easier to deal with!
droscarenriquez 4 months ago
@GarethMcKinley Thanks for your comment, Gareth!
The experiment is indeed greatly influenced by Relative Humidity. We monitored RH but had no means to control it. We did a few runs with RH > 60% and it was basically impossible to get a good shot because ice deposition on the cold plate was so fast it either blocked the view of the droplet or caused the drop to spread completely when hitting the plate. In the few decent shots we managed, ice crystal formation on the drop was quite fast...
droscarenriquez 4 months ago