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Marangoni flows and instabilities during drying

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Inhomogeneous drying conditions result in Marangoni flows and instabilities with a free-surface deformation. Surface tension of multi-component solutions depend on both temperature and composition, and a local inhomogeneous heat and mass transfer lead to mass flow and film defects. In order to investigate the flow field within thin films, a new measurement technique (3D μPTV) has been developed. This measurement technique gives unique insights, which will allow us to identify process parameters crucial to the surface homogeneity of thin films and printed structures. An overview about former results and new results will be presented with a focus on stability analysis and a critical Marangoni number and new correlation.

This talk is part of the Seminars for the Centre for Environmental and Industrial Flows series.

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