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Sequential deposition of overlapping droplets to form a liquid line

Published online by Cambridge University Press:  21 November 2014

Alice B. Thompson ,
Carl R. Tipton ,
Anne Juel ,
Andrew L. Hazel  and
Mark Dowling
Alice B. Thompson*
Affiliation:
School of Mathematics and Manchester Centre for Nonlinear Dynamics, University of Manchester, Oxford Road, Manchester M13 9PL, UK
Carl R. Tipton
Affiliation:
School of Mathematics and Manchester Centre for Nonlinear Dynamics, University of Manchester, Oxford Road, Manchester M13 9PL, UK
Anne Juel
Affiliation:
School of Mathematics and Manchester Centre for Nonlinear Dynamics, University of Manchester, Oxford Road, Manchester M13 9PL, UK
Andrew L. Hazel
Affiliation:
School of Mathematics and Manchester Centre for Nonlinear Dynamics, University of Manchester, Oxford Road, Manchester M13 9PL, UK
Mark Dowling
Affiliation:
Cambridge Display Technology Limited, Technology Development Centre, Unit 12, Cardinal Business Park, Godmanchester, Cambridgeshire PE29 2XG, UK
*
†Present address: Department of Mathematics, Imperial College London, London SW7 2AZ, UK. Email address for correspondence: [email protected]
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Abstract

Microdroplet deposition is a technology that spans applications from tissue engineering to microelectronics. Our new high-speed imaging measurements reveal how sequential linear deposition of overlapping droplets on flat uniform substrates leads to striking non-uniform morphologies for moderate contact angles. We develop a simple physical model, which for the first time captures the post-impact dynamics drop-by-drop: surface-tension drives liquid redistribution, contact-angle hysteresis underlies initial non-uniformity, while viscous effects cause subsequent periodic variations.

JFM classification

Interfacial Flows (free surface): Contact lines Micro-/Nano-fluid dynamics: Microfluidics Interfacial Flows (free surface): Thin films
Type
Papers
Information
Journal of Fluid Mechanics , Volume 761 , 25 December 2014 , pp. 261 - 281
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Copyright
© 2014 Cambridge University Press 

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