Article Dans Une Revue Rheologica Acta Année : 2010

Spreading and fingering in a yield-stress fluid during spin coating

Résumé

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.

Dates et versions

hal-00658381 , version 1 (10-01-2012)

Identifiants

Citer

Kristi E. Holloway, Hervé Tabuteau, John R. de Bruyn. Spreading and fingering in a yield-stress fluid during spin coating. Rheologica Acta, 2010, 49 (3), pp.245-254. ⟨10.1007/s00397-009-0409-1⟩. ⟨hal-00658381⟩
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