ePrints@IIScePrints@IISc Home | About | Browse | Latest Additions | Advanced Search | Contact | Help

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.

[img] PDF
com_fla_161-12_3181_2014.pdf - Published Version
Restricted to Registered users only

Download (3MB) | Request a copy
Official URL: http://dx.doi.org/ 10.1016/j.combustflame.2014.06....

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
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
Depositing User: Id for Latest eprints
Date Deposited: 26 Dec 2014 06:35
Last Modified: 26 Dec 2014 06:35
URI: http://eprints.iisc.ac.in/id/eprint/50507

Actions (login required)

View Item View Item