Suppression of instabilities in burning droplets using preferential acoustic perturbations

Miglani, Ankur and Basu, Saptarshi and Kumar, Ranganathan (2014) Suppression of instabilities in burning droplets using preferential acoustic perturbations. In: COMBUSTION AND FLAME, 161 (12). pp. 3181-3190.

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Abstract

Self-induced internal boiling in burning functional droplets has been observed to induce severe bulk shape oscillations in droplets with characteristic bubble ejection events that corrugate the droplet surface. Such bubble-droplet interactions are characterized by a distinct regime of a single bubble growing inside the droplet where evaporative Darrieus-Landau instability occurs at the bubble-droplet interface. In this regime the bubble-droplet system behaves as a self-excited coupled oscillator. In this study, we report the external flame-acoustic interaction with bubbles inside the droplet resulting in controlled droplet deformation. In particular, by exciting the droplet flame in a critical, responsive frequency range (80 Hz <= f(p) <= 120 Hz) the droplet deformation cycle could be altered through suppression of these self-excited instabilities and intensity/frequency of bubble ejection events. This selective acoustic tuning also enabled the control of bubble dynamics, bulk droplet-shape distortion and the final precipitate morphology even in burning nanoparticle laden droplets. (C) 2014 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

Item Type:	Journal Article
Publication:	COMBUSTION AND FLAME
Publisher:	ELSEVIER SCIENCE INC
Additional Information:	Copyright for this article belongs to the ELSEVIER SCIENCE INC, 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA
Keywords:	Interfacial instability; Bubble ejections; Droplet deformation; Nanofluid fuels; Nanoparticles
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	26 Dec 2014 06:35
Last Modified:	26 Dec 2014 06:35
URI:	http://eprints.iisc.ac.in/id/eprint/50507

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