Experimental analysis of shape deformation of evaporating droplet using Legendre polynomials

    Authors

    A. Sanyal; S. Basu;R. Kumar

    Comments

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    Abbreviated Journal Title

    Phys. Lett. A

    Keywords

    Laser heating; Droplet instability; Legendre polynomial; ACOUSTIC LEVITATION; VAPORIZATION; ATOMIZATION; FLOW; Physics, Multidisciplinary

    Abstract

    Experiments involving heating of liquid droplets which are acoustically levitated, reveal specific modes of oscillations. For a given radiation flux, certain fluid droplets undergo distortion leading to catastrophic bag type breakup. The voltage of the acoustic levitator has been kept constant to operate at a nominal acoustic pressure intensity, throughout the experiments. Thus the droplet shape instabilities are primarily a consequence of droplet heating through vapor pressure, surface tension and viscosity. A novel approach is used by employing Legendre polynomials for the mode shape approximation to describe the thermally induced instabilities. The two dominant Legendre modes essentially reflect (a) the droplet size reduction due to evaporation, and (b) the deformation around the equilibrium shape. Dissipation and inter-coupling of modal energy lead to stable droplet shape while accumulation of the same ultimately results in droplet breakup. (C) 2013 Elsevier B.V. All rights reserved.

    Journal Title

    Physics Letters A

    Volume

    378

    Issue/Number

    5-6

    Publication Date

    1-1-2014

    Document Type

    Article

    Language

    English

    First Page

    539

    Last Page

    548

    WOS Identifier

    WOS:000330916300016

    ISSN

    0375-9601

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