Effect of evaporation and agglomeration on droplet shape oscillations

Deepu, P and Basu, Saptarshi (2014) Effect of evaporation and agglomeration on droplet shape oscillations. In: CHEMICAL ENGINEERING SCIENCE, 119 . pp. 212-217.

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Abstract

The effects of evaporation and the presence of agglomerating nanoparticles on the oscillation characteristics of pendant droplets are studied experimentally using ethanol and aqueous nanoalumina suspension, respectively. Axisymmetric oscillations induced by a round air jet are considered. Wavelet transform of the time evolution of the 2nd modal coefficient revealed that while a continuous increase in the natural frequency of the droplet occurs with time due to the diameter regression induced by vaporization in the case of ethanol droplet, no such change in resonant frequency occurs in the case of the agglomerating droplet. However, a gradual reduction in the oscillation amplitude ensues as the agglomeration becomes dominant. (C) 2014 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	CHEMICAL ENGINEERING SCIENCE
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Additional Information:	Copyright for this article belongs to the PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND.
Keywords:	Droplet oscillations; Rayleigh modes; Evaporation; Nanosuspensions; Agglomeration
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	08 Nov 2014 05:24
Last Modified:	08 Nov 2014 05:24
URI:	http://eprints.iisc.ac.in/id/eprint/50192

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