Dynamics and fracture of ligaments from a droplet on a vibrating surface

Deepu, P and Basu, Saptarshi and Kumar, Ranganathan (2013) Dynamics and fracture of ligaments from a droplet on a vibrating surface. In: Physics of Fluids, 25 (8). 082106_1-082106_19.

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Abstract

A droplet residing on a vibrating surface and in the pressure antinode of an asymmetric standing wave can spread radially outward and atomize. In this work, proper orthogonal decomposition through high speed imaging is shown to predict the likelihood of atomization for various viscous fluids based on prior information in the droplet spreading phase. Capillary instabilities are seen to affect ligament rupture. Viscous dissipation plays an important role in determining the wavelength of the most unstable mode during the inception phase of the ligaments. However, the highest ligament capillary number achieved was less than 1, and the influence of viscosity in the ligament growth and breakup phases is quite minimal. It is inferred from the data that the growth of a typical ligament is governed by a balance between the inertial force obtained from the inception phase and capillary forces. By including the effect of acoustic pressure field around the droplet, the dynamics of the ligament growth phase is revealed and the ligament growth profiles for different fluids are shown to collapse on a straight line using a new characteristic time scale.

Item Type:	Journal Article
Publication:	Physics of Fluids
Publisher:	American Institute of Physics
Additional Information:	Copyright of this article belongs to American Institute of Physics.
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	04 Oct 2013 05:39
Last Modified:	31 Jan 2019 08:50
URI:	http://eprints.iisc.ac.in/id/eprint/47499

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