Suppression of instabilities in burning droplets using preferential acoustic perturbations

    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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