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

  • J. O. MARSTON (a1) (a2), S. P. DECENT (a1) and M. J. H. SIMMONS (a2)

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: $0.14\,{<}\,\hbox{\it Re}\,{<}\,33.02$; capillary number: $0.19\,{<}\,\hbox{\it Ca}\,{<}\,25.07$). 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.

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

  • J. O. MARSTON (a1) (a2), S. P. DECENT (a1) and M. J. H. SIMMONS (a2)

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