Observation and modelling of clamshell droplets on vertical fibres, subjected to gravitational and drag forces

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Title Observation and modelling of clamshell droplets on vertical fibres, subjected to gravitational and drag forces
Author Mullins, Benjamin James; Braddock, Roger David; Agranovski, Igor E; Cropp, Roger Allan; O'Leary, Rebecca A.
Journal Name Journal of Colloid and Interface Science
Year Published 2005
Place of publication San Diego, USA
Publisher Elsevier Science
Abstract Extensive experimental investigation of the wetting processes of fibre–liquid systems during air filtration (when drag and gravitational forces are acting) has shown many important features, including droplet extension, oscillatory motion, and detachment of drops from fibres as airflow velocity increases, and also movement or flow of droplets along fibres. A detailed experimental study of the processes was conducted using stainless steel filter fibres and H2O aerosol, which coalesce on the fibre to form clamshell droplets. The droplets were predominantly observed in the Reynolds transition flow region, since this is the region where most of the above features occur. The droplet oscillation is believed to be induced by the onset of the transition from laminar to turbulent flow as the increasing droplet size increases Reynolds number for the flow around the droplet. Two-dimensional flow in this region is usually modelled using the classical Karman vortex street, however there exist no 3D equivalents. Therefore to model such oscillation it was necessary to create a new conceptual model to account for the forces both inducing and preventing such oscillation. The agreement between the model and experimental results is very good for both the radial and transverse oscillations.
Peer Reviewed Yes
Published Yes
Publisher URI http://www.elsevier.com/wps/find/journaldescription.cws_home/622861/description#description
Alternative URI http://dx.doi.org/10.1016/j.jcis.2004.10.013
Copyright Statement Copyright 2005 Elsevier : Please refer to the journal's website for access to the definitive, published version.
Volume 284
Issue Number 1
Page from 245
Page to 254
ISSN 0021-9797
Date Accessioned 2006-03-01
Language en_AU
Faculty Faculty of Engineering and Information Technology
Subject PRE2009-Environmental Technologies
URI http://hdl.handle.net/10072/4288
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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