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Ejecta, Corolla, and Splashes from Drop Impacts on Viscous Fluids.

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Investigating liquid drop impacts reveals two distinct sheets forming the splash crown. The ejecta sheet from the drop and a substrate sheet evolve separately, influencing dynamics based on liquid viscosity.

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Area of Science:

  • Fluid dynamics
  • Rheology
  • Surface science

Background:

  • Drop impact phenomena are crucial in various natural and industrial processes.
  • Understanding splash dynamics requires characterizing fluid behavior across a wide range of viscosities.

Purpose of the Study:

  • To investigate the impact of liquid drops on viscous aqueous glycerol solutions.
  • To analyze the influence of variable pool viscosity and air pressure on drop impact dynamics.
  • To differentiate the contributions of drop and substrate liquids to splash formation.

Main Methods:

  • Experimental drop impact studies.
  • Numerical simulations of fluid flow.
  • Systematic variation of pool viscosity and air pressure.

Main Results:

  • The splash crown (corolla) comprises two distinct liquid sheets: one from the impacting drop (ejecta) and another from the pool (substrate).
  • These sheets evolve on separate timescales, with their relative contributions varying.
  • The viscosity ratio between the drop and the pool significantly affects the overall splash dynamics and extent.

Conclusions:

  • Drop impacts on viscous liquids generate complex splash patterns involving distinct liquid sources.
  • The observed two-sheet structure provides a new framework for understanding splash evolution.
  • Controlling viscosity ratios is key to predicting and manipulating splash behavior.