On the dynamics of vortex-droplet co-axial interaction: Insights into droplet and vortex dynamics

Sharma, S and Singh, AP and Basu, S (2021) On the dynamics of vortex-droplet co-axial interaction: Insights into droplet and vortex dynamics. In: Journal of Fluid Mechanics, 918 .

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Abstract

Interaction of droplets with vortical structures is ubiquitous in nature, ranging from raindrops to a gas turbine combustor. In this work, we elucidate the mechanism of co-axial interaction of a droplet with a vortex ring of different circulation strengths . We focus on both the droplet and the vortex dynamics, which evolve in a spatio-temporal fashion during different stages of the interaction, as in a two-way coupled system. Vortex rings of varying circulation strengths are generated by injecting a slug of water into a quiescent water-filled chamber. Experimental techniques such as high-speed particle image velocimetry, planner laser-induced fluorescence imaging and high-speed shadowgraphy are used in this work. In the droplet dynamics, different regimes of interaction are identified, including deformation (regime-I), stretching and engulfment (regime-II) and breakup of the droplet (regime-III). Each interaction regime is explained using existing theoretical models that closely match the experimental data. In the vortex dynamics, we compare the interaction's effect on different characteristics of the vortex rings, such as pressure and the vorticity distribution, circulation strength, total energy and enstrophy variation with time. It is found that the interaction leads to a reduction in these parameters. © Authors 2021

Item Type:	Journal Article
Publication:	Journal of Fluid Mechanics
Publisher:	Cambridge University Press
Additional Information:	The copyright for this article belongs to Cambridge University Press
Keywords:	Drop breakup; Fluorescence imaging; Rings (components); Velocity measurement; Vorticity, Different stages; Droplet dynamics; Experimental techniques; Gas turbine combustor; High-speed particles; Laser-induced fluorescence imaging; Vortical structures; Vorticity distribution, Vortex flow
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	16 Aug 2021 10:15
Last Modified:	16 Aug 2021 10:15
URI:	http://eprints.iisc.ac.in/id/eprint/69188

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