Spreading and fingering in a yield-stress fluid during spin coating |
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Authors: | Kristi E Holloway Hervé Tabuteau John R de Bruyn |
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Institution: | 1. Department of Physics and Physical Oceanography, Memorial University of Newfoundland, St. John’s, Newfoundland and Labrador, Canada, A1B 3X7 2. Department of Physics and Astronomy, The University of Western Ontario, London, Ontario, Canada, N6A 3K7 3. Laboratoire de Collo?des, Verres, et Nanomatériaux, UMR 5587, Montpellier, France
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Abstract: | We study the deformation, spreading, and fingering of small droplets of a yield-stress fluid subjected to a centrifugal force
on a rotating substrate. At low rotation rates and for small enough droplets, the droplets deform elastically but retain their
essentially circular contact line. For large enough droplet volumes and rotation speeds, however, one or more fingers eventually
form and grow at the edge of the drop. This fingering is qualitatively different from the contact line instability observed
in other fluids, and appears to be a localized phenomenon that occurs when the stress at some point on the perimeter of the
drop exceeds the yield stress. |
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