Title

Suppression Of Instabilities In Burning Droplets Using Preferential Acoustic Perturbations

Keywords

Bubble ejections; Droplet deformation; Interfacial instability; Nanofluid fuels; Nanoparticles

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. ≤. fP≤. 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.

Publication Date

12-1-2014

Publication Title

Combustion and Flame

Volume

161

Issue

12

Number of Pages

3181-3190

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.combustflame.2014.06.010

Socpus ID

84908330080 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84908330080

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