Hysteresis and non-uniqueness in the speed of the onset of instability in curtain coating

J. O. Marston, S. P. Decent, M. J. H. Simmons

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    Abstract

    The maximum speed of stable coating is determined experimentally by the onset of air entrainment in curtain coating onto a pre-wetted surface over a broad range of dimensionless parameters (Reynolds number: 0.14 < Re < 33.02; capillary number: 0.19 < Ca < 25.07). We show not only that the substrate speed at the onset of instability is flow-rate dependent for a pre-wetted surface, but that the speed at which instability Occurs is not always unique for a given flow rate.

    Original languageEnglish
    Pages (from-to)349-363
    Number of pages15
    JournalJournal of Fluid Mechanics
    Volume569
    DOIs
    Publication statusPublished - Dec 2006

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