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Detachment of droplets from cylinders in flow using an experimental analogue

Published online by Cambridge University Press:  20 April 2015

C. J. Hotz ,
R. Mead-Hunter ,
T. Becker ,
A. J. C. King ,
S. Wurster ,
G. Kasper  and
B. J. Mullins
C. J. Hotz
Affiliation:
Institute for Mechanical Process Engineering and Mechanics, Karlsruhe Institut fuer Technologie, D-76131, Karlsruhe, Germany Fluid Dynamics Research Group, Curtin University, GPO Box U1987, Perth WA 6845, Australia
R. Mead-Hunter*
Affiliation:
Fluid Dynamics Research Group, Curtin University, GPO Box U1987, Perth WA 6845, Australia Health, Safety and Environment, School of Public Health, Faculty of Health Sciences, Curtin University, GPO Box U1987, Perth WA 6845, Australia
T. Becker
Affiliation:
Nanochemistry Research Institute, Curtin University, GPO Box U1987, Perth WA 6845, Australia
A. J. C. King
Affiliation:
Fluid Dynamics Research Group, Curtin University, GPO Box U1987, Perth WA 6845, Australia
S. Wurster
Affiliation:
Institute for Mechanical Process Engineering and Mechanics, Karlsruhe Institut fuer Technologie, D-76131, Karlsruhe, Germany
G. Kasper
Affiliation:
Institute for Mechanical Process Engineering and Mechanics, Karlsruhe Institut fuer Technologie, D-76131, Karlsruhe, Germany
B. J. Mullins
Affiliation:
Fluid Dynamics Research Group, Curtin University, GPO Box U1987, Perth WA 6845, Australia Health, Safety and Environment, School of Public Health, Faculty of Health Sciences, Curtin University, GPO Box U1987, Perth WA 6845, Australia
*
†Email address for correspondence: r.mead-hunter@curtin.edu.au
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Abstract

This work experimentally examines the detachment of liquid droplets from both oleophilic and oleophobic fibres, using an atomic force microscope. The droplet detachment force was found to increase with increasing fibre diameter and forces were higher for philic fibres than phobic fibres. We also considered the detachment of droplets situated on the intersection of two fibres and arrays of fibres (such as found in fibrous mats or filters) and found that the required detachment forces were higher than for similarly sized droplets on a single fibre, though not as high as expected based on theory. A model was developed to predict the detachment force, from single fibres, which agreed well with experimental results. It was found that the entire dataset (single and multiple fibres) could be best described by power law relationships.

JFM classification

Drops and Bubbles: Breakup/coalescence Drops and Bubbles: Bubble dynamics Drops and Bubbles: Drops and Bubbles

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Type
Papers
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Journal of Fluid Mechanics , Volume 771 , 25 May 2015 , pp. 327 - 340
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© 2015 Cambridge University Press 

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