This video shows drops levitating steadily over a moving wall. We show that silicon oil drops beautifully levitate over a no-coated, no-heated glass surface. The lift force, which is vital for the levitation, is generated inside a thin air film existing between the drop and the moving wall. Using interferometry technique, we obtain the three-dimensional shape of the air film. We then calculate the lift by applying the lubrication theory. It is found that the drop’s little deformation (µm size) builds up pressures for levitating a mm-sized drop. Finally we show many drops levitating over a moving wall together.
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