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Title: Vortical interfaces between immiscible fluids

Description: The movie captures the complicated morphology of vortical interfaces formed between the oil and water in a beaker when a stir bar accelerates in the water. The three different oils in the study produced very different instability patterns. Canola oil is the smoothest, characterized by satellite droplets, and looking like a classic tornado about to touch down; STP® fuel treatment is a little rougher with irregular satellites; and the oil treatment is the most elastic, looking like the dissolving of a funnel cloud with tangled spaghetti-like filaments.

Credits: W. Alexander, S. Rolland, C. Lee, and A. Shen

References:

Web Page: http://pof.aip.org/pof/gallery/video/2004/911409phfmid.mov

Contributed By: Tausif Billah