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Splash of a drop impacting onto a solid substrate wetted by a thin film of another liquid

Hannah M. Kittel, Ilia V. Roisman*, and Cameron Tropea

  • Technische Universität Darmstadt, Germany Institute of Fluid Mechanics and Aerodynamics, Alarich-Weiss-Straße 10, 64287 Darmstadt, Germany

  • *roisman@sla.tu-darmstadt.de
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Phys. Rev. Fluids 3, 073601 – Published 2 July, 2018

DOI: https://doi.org/10.1103/PhysRevFluids.3.073601

Abstract

In this study, the impact of a liquid drop onto a thin liquid film of a different fluid is investigated experimentally using a high-speed video system and analysed theoretically to obtain expressions for predicting splashing thresholds. The study focuses on impact conditions leading to one of four outcomes: deposition, corona without splash, corona splash, and partial rebound. In addition to the conventional influencing parameters, which are usually described by combinations of impact Weber and Reynolds numbers and dimensionless film thickness, also the ratio of the drop and film liquid viscosities have been systematically varied over a wide range. The results of the theoretical analysis, in good agreement with the experimental observations, show that the well-known K number determines the splashing threshold only if the viscosity of the film is much larger or much smaller than the drop viscosity. If the drop and film viscosities are comparable, a critical modified K number is introduced, which is a function of the viscosity ratio.

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Phys. Rev. Fluids 3, 073601– Published 2 July, 2018
  • Received 22 November 2017
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