Browsing by Author "Schubert, Stefan"

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    Micro-PIV study on the influence of viscosity on the dynamics of droplet impact onto a thin film
    (2024) Schubert, Stefan; Steigerwald, Jonas; Geppert, Anne K.; Weigand, Bernhard; Lamanna, Grazia
    This work presents a systematic experimental study of droplet impact onto a wet substrate. Four different silicone oils are used, covering a range of Reynolds number between 116270. This is not observed at lower Re numbers due to the increased pressure losses caused by the extensional (normal) strain during the radial spreading of the lamella. To validate these findings a holistic approach is chosen, which combines numerical results, analytical solutions and experimental data from literature. In particular, by using the continuity equation, it is shown that the experimental decay of the wall film height can be reconstructed from the velocity measurements. Consilience of results from different approaches provides a robust validation of the micro-PIV data obtained in this work.