Experimental investigation of a nonspherical water droplet falling in air
Agrawal, Meenu and Katiyar, Rajat Kumar and Karri, Badarinath and Sahu, Kirti Chandra (2020) Experimental investigation of a nonspherical water droplet falling in air. Physics of Fluids, 32 (11). p. 112105. ISSN 1070-6631
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We experimentally investigate the shape oscillations of an initially nonspherical water droplet falling in air using high-speed imaging. We design a customized experimental setup that allows us to study the freely falling droplets of initially oblate/prolate/tilted configurations. The setup uses a pneumatic piston-cylinder arrangement and a superhydrophobically coated plate to propel a droplet upwards in air whose motion is then recorded using a high-speed camera. Due to the propulsive force imparted to the droplet, it undergoes oblate-prolate oscillations and eventually comes to rest at a maximum height, at which time the droplet has a zero vertical velocity and a nonspherical shape with an inclination to the horizontal. We study the effect of the initial aspect ratio and size of the droplet on its shape oscillations during its downward motion.
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