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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Abstract

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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IITH Creators:

IITH Creators	ORCiD
Sahu, Kirti Chandra	http://orcid.org/0000-0002-7357-1141

Item Type:

Article

Uncontrolled Keywords:

Experimental investigations, Falling droplet, High speed imaging Nonspherical shapes, Pneumatic pistons Propulsive forces, Shape oscillation,Vertical velocity

Subjects:

Chemical Engineering
Chemical Engineering > Fluid Mechanics
Chemical Engineering > Explosives, fuels, related products
Chemical Engineering > Oils, fats, waxes, gases
Chemical Engineering > Ceramic and allied technologies
Chemical Engineering > Cleaning, color, coating, related technologies
Chemical Engineering > Organic products
Chemical Engineering > Biochemical Engineering

Divisions:

Department of Chemical Engineering

Depositing User:

. LibTrainee 2021

Date Deposited:

27 May 2021 10:39

Last Modified:

27 May 2021 10:39

URI:

http://raiith.iith.ac.in/id/eprint/7853