Abstract
The development of instabilities under the joint action of the Van der Waals forces and Marangoni stresses in a two-layer film on a heated or cooled substrate, is considered. The problem is solved by means of a linear stability theory and nonlinear simulations. Nontrivial change of the droplet shape in the presence of the Marangoni effect, which manifests itself as the deformation of a “plateau” into an “inkpot”, is observed. The appearance of the threshold oscillations predicted by the linear stability theory is confirmed by nonlinear simulations. In the case of a lateral heating, the film instability leads typically to formation of droplets which are driven by the thermocapillary flow and coalesce in an anisotropic way.
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Paper was submitted for the Second International Topical Team Workshop on TWO-PHASE SYSTEMS FOR GROUND AND SPACE APPLICATIONS October 26–28, 2007, Kyoto, Japan.
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Nepomnyashchy, A.A., Simanovskii, I.B. Dynamics of ultra-thin two-layer films. Microgravity Sci. Technol 19, 167–171 (2007). https://doi.org/10.1007/BF02915789
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DOI: https://doi.org/10.1007/BF02915789