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Title: Electro-Coalescence

Description: A water droplet is deposited inside a layer of silicone oil, slightly above a planar silicone oil-water interface. The neutrally-charged droplet is brought down gently by gravitational forces and eventually comes to rest on the interface. However, a microscopic film of the silicone oil prevents the droplet from coalescing immediately. At this point a DC voltage is applied to the large, flat electrodes positioned above and below the interface. The electric field has an influence on the dynamics of the coalescence. An increase in the electric field strength results in a larger perturbation of the interface, and larger amounts of water are left behind after coalescence than is normally seen with naturally occurring secondary drops.

Credits: Hamarz Aryafar, Pirouz Kavehpour

References:

Web Page: http://pof.aip.org/pof/gallery/video/2007/901709phf1enhanced.mov

Contributed By: Tausif Billah

 
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