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Asymptotic regimes in elastohydrodynamic and stochastic leveling on a viscous film

Pedersen, Christian ; Niven, John F. ; Salez, Thomas ; Dalnoki-Veress, Kari ; Carlson, Andreas

Physical review fluids, 2019-12, Vol.4 (12), Article 124003 [Periódico revisado por pares]

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Título:
Asymptotic regimes in elastohydrodynamic and stochastic leveling on a viscous film
Autor: Pedersen, Christian ; Niven, John F. ; Salez, Thomas ; Dalnoki-Veress, Kari ; Carlson, Andreas
Assuntos: Condensed Matter ; Fluid Dynamics ; Fluid mechanics ; Materials Science ; Mechanics ; Mechanics of materials ; Physics ; Soft Condensed Matter ; Solid mechanics ; Statistical Mechanics
É parte de: Physical review fluids, 2019-12, Vol.4 (12), Article 124003
Descrição: An elastic sheet that deforms near a solid substrate in a viscous fluid is a situation relevant to various dynamical processes in biology, geophysics, and engineering. Here, we study the relaxation dynamics of an elastic plate resting on a thin viscous film that is supported by a solid substrate. By combining scaling analysis, numerical simulations, and experiments, we identify asymptotic regimes for the elastohydrodynamic leveling of a surface perturbation of the form of a bump, when the flow is driven by either the elastic bending of the plate or thermal fluctuations. In both cases, two distinct regimes are identified when the bump height is either much larger or much smaller than the thickness of the prewetted viscous film. Our analysis reveals a distinct crossover between the similarity exponents with the ratio of the perturbation height to the film height.
Editor: American Physical Society
Idioma: Inglês;Norueguês

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