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(Top) scaling of (α s the sliding angle for a drop) as a function of , with L c the capillary length for water under normal conditions of pressure and temperature. Values of Ω range from 15 µl to 100 µl. A linear fit (dashed line) to experimental data is expected, according to our theory. (Middle) experimental law for the relation between wind speed u s and drop volume Ω on an horizontal plane, law stemming from the competition between the drag force and the adhesion force. Linear correlation (red line) is consistent with our theoretical model. (Bottom) experimental results on the angle β taken by drops of given volume Ω under an horizontal wind u. Drops small enough are set on a vertical plane (we took or 25 so they can stay DESPITE GRAVITY). Then the wind blower is switched on, and blows horizontally with a speed u bigger than u s (Ω), the minimum value needed to dislodge the drop. As our model predicts, there is a linear law between and the ratio u 2Ω−1/3/g *.
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