Finger instability in Wetting-Dewetting phenomena.
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Biomedical subjects
Publications and source records attributed to A V Lyushnin.
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We demonstrate that the usual situation of coarsening in crystal growth or Ostwald ripening in evaporating liquid drops is not universal, and when the drops coexist with a microscopically thin continuous surface film, a different behavior is observed. The predicted behavior was investigated experimentally and supported by numerical simulations.
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The fingering instability of growing dry patches in an evaporating film of a polar liquid placed on a solid substrate is investigated. The instability manifests itself as fingering of mobile fronts between growing "dry" (thin) and shrinking "wet" (thick) regions of the film corresponding to two stable states of the evaporating film in contact with its vapor. The boundaries of the fingering instability are found through linear stability analysis of numerical solutions of the nonlinear evolution equation defining the film profile, and the influence of the evaporation rate, polar intermolecular forces, and chemical heterogeneity of the substrate is investigated.