Sequential deposition of overlapping droplets to form a liquid line

Alice Thompson, Carl Tipton, Anne Juel, Andrew Hazel, Mark Dowling

    Research output: Contribution to journalArticlepeer-review

    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.
    Original languageEnglish
    Pages (from-to)261-281
    Number of pages21
    JournalJournal of Fluid Mechanics
    Volume761
    DOIs
    Publication statusPublished - Dec 2014

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