Title

Criteria For Thermally Induced Atomization And Catastrophic Breakup Of Acoustically Levitated Droplet

Keywords

Acoustic levitation; Atomization; Bag breakup of droplets; Instabilities

Abstract

We report thermally induced instability leading to catastrophic breakup in acoustically levitated vaporizing fuel droplets. Change in surface tension and viscosity with increase in droplet temperature causes wide fluctuations in droplet aspect ratio. If the viscous damping of aspect ratio oscillation is not strong enough, the droplet goes through unbounded stretching. If the droplet exceeds a critical Weber number locally, a bag type and capillary wave induced atomization can occur, which leads to catastrophic breakup. A stability criterion has been established based on the inhomogeneity of Bernoulli (acoustic) pressure and surface tension of the droplet in terms of a local Weber number and Ohnesorge number. This instability is thermally induced in a droplet which does not experience instabilities without heating.© 2012 Elsevier Ltd. All rights reserved.

Publication Date

1-28-2013

Publication Title

International Journal of Heat and Mass Transfer

Volume

59

Issue

1

Number of Pages

316-327

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.ijheatmasstransfer.2012.12.040

Socpus ID

84872707414 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84872707414

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