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Summary
This summary is machine-generated.

Droplet splashing on surfaces creates a thin sheet that breaks apart. This study identifies three distinct splash patterns based on where the sheet and rim breakup occur, revealing transitions influenced by fluid properties.

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Area of Science:

  • Fluid dynamics
  • Surface science
  • Impact phenomena

Background:

  • Droplet impact on solid surfaces can lead to splashing.
  • Thin-sheet splash, characterized by sheet formation and subsequent breakup, is a phenomenon observed at high droplet inertia.
  • Previous work defined thin-sheet splash but lacked detailed classification of breakup behaviors.

Purpose of the Study:

  • To experimentally investigate and classify the distinct breakup patterns of thin-sheet splash.
  • To determine the influence of key dimensionless numbers (Weber and Ohnesorge) on splash pattern transitions.
  • To establish a regime map for thin-sheet splash patterns.

Main Methods:

  • Utilized high-speed imaging with a long-distance microscope for detailed observation of droplet impact dynamics.
  • Experimentally varied Weber number (We) and Ohnesorge number (Oh) to explore a wide range of impact conditions.
  • Analyzed droplet breakup events to categorize splash patterns based on rim and sheet breakup locations.

Main Results:

  • Identified three distinct thin-sheet splash patterns: rim breakup (pattern 1), simultaneous rim and sheet breakup (pattern 2), and sheet breakup followed by rim breakup (pattern 3).
  • Quantified the effects of Weber and Ohnesorge numbers on the transitions between these three patterns.
  • Developed a regime nomogram illustrating splash pattern distribution in the We-Oh parameter space.

Conclusions:

  • Thin-sheet splash is not a single phenomenon but exhibits distinct patterns based on breakup location.
  • Fluid inertia (Weber number) and viscosity (Ohnesorge number) are critical parameters governing splash pattern selection.
  • The established regime nomogram provides a predictive tool for understanding droplet splash behavior.