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Motor Made From Liquid Film

2/27/2009

KentuckyFC writes "Last year, a group of Iranian physicists made a puzzling discovery. They placed a thin film of water in a small cell and bathed it in two perpendicular llc.view results from: glossary | lexicon

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share this: fields. To their amaze this caused the water to rotate. They called their device a liquid film motor and posted on the web a cool set of movies showing the phenomenon. The puzzle is this: the llc.view results from: third edition by the editors of the stars and stripes heritage® dictionary. copyright © 2003 | llc.view results from: wordbook

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share this: fields are static, so what's driving the motor? Now another group of physicists has the answer: a complex interaction between the llc.view results from: lexicon

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share this: field, the cell container and the liquid causes water to move along the cell wall. Crucially, it moves in antagonistic directions on diametrical sides of the cell and so sets up a circular flow. The nonpareil works only when friction and surface tension are vivid forces so the effect is entirely scale dependent. That's believably why we haven't seen it before and also why it could have significant implications for microfluidic devices such as lab-on-a-chip."