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Agglomeration front dynamics: Drying in sessile nano-particle laden droplets

Sanyal, Apratim and Basu, Saptarshi and Chaudhuri, Swetaprovo (2015) Agglomeration front dynamics: Drying in sessile nano-particle laden droplets. In: CHEMICAL ENGINEERING SCIENCE, 123 . pp. 164-169.

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Official URL: http://dx.doi.org/ 10.1016/j.ces.2014.11.020

Abstract

The drying of sessile, nano-silica laden water droplet is studied under ambient conditions, in the absence of any convection. The drying process can be divided into two distinct regimes. During regime 1, the outer edge of the droplet remains pinned and particles agglomerate at the droplet periphery similar to the traditional coffee ring. However in regime 2, with further evaporation, both the liquid contact line and the agglomeration front starts moving radially inwards from the initial contact edge. The contact between the liquid and the agglomerate is maintained throughout regime 2 and the vaporisation driven liquid edge recession essentially drives the inward growth of the particle deposition. Fast kinetics of particle aggregation results in rapid growth of this agglomeration front as seen from the experiments. A theoretical formulation involving a simplistic model of the agglomeration front growth based on particle mass balance has been proposed. (C) 2014 Elsevier Ltd. All rights reserved,

Item Type: Journal Article
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Additional Information: Copy right for this article belongs to the PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Keywords: Bowl formation; Droplet evaporation; Particle agglomeration front; Fast agglomeration kinetics; Nanofluids
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering (Formerly, Aeronautical Engineering)
Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 04 Mar 2015 12:35
Last Modified: 04 Mar 2015 12:35
URI: http://eprints.iisc.ernet.in/id/eprint/50977

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