Title

Suppression of instabilities in burning droplets using preferential acoustic perturbations

Authors

Authors

A. Miglani; S. Basu;R. Kumar

Comments

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Abbreviated Journal Title

Combust. Flame

Keywords

Interfacial instability; Bubble ejections; Droplet deformation; Nanofluid fuels; Nanoparticles; SUPERHEAT LIMIT; SOLID-SURFACE; COMBUSTION; PRESSURE; BREAKUP; MICROEXPLOSION; COLLISION; DYNAMICS; Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary; Engineering, Chemical; Engineering, Mechanical

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.

Journal Title

Combustion and Flame

Volume

161

Issue/Number

12

Publication Date

1-1-2014

Document Type

Article

Language

English

First Page

3181

Last Page

3190

WOS Identifier

WOS:000345200500014

ISSN

0010-2180

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