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Thin-sheet creation and threshold pressures in drop splashing.

Andrzej Latka1

  • 1The James Franck Institute and Department of Physics, The University of Chicago, Chicago, Illinois 60637, USA. andrzej.i.latka@gmail.com.

Soft Matter
|December 24, 2016
PubMed
Summary
This summary is machine-generated.

The ambient gas, not the liquid, causes splash sheet formation. Sheet creation timing depends on air pressure and spreading stage, with rough surfaces introducing a new velocity threshold for splashing.

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Area of Science:

  • Fluid dynamics
  • Physics of liquids
  • Surface science

Background:

  • Liquid drop impacts on solid surfaces can cause splashing.
  • Splashing involves the ejection of a thin liquid sheet.
  • Ambient gas properties influence splash dynamics.

Purpose of the Study:

  • Investigate the role of ambient gas pressure on splash sheet formation timing.
  • Examine the effect of surface topography on splash thresholds.
  • Clarify the relationship between impact velocity, air pressure, and splashing.

Main Methods:

  • High-speed imaging of liquid drop impacts.
  • Controlled variation of ambient air pressure.
  • Experiments on surfaces with mixed roughness.

Main Results:

  • Sheet creation time shows distinct pressure dependencies at early vs. late spreading stages.
  • A new threshold impact velocity for sheet creation was identified on mixed-roughness surfaces.
  • This threshold velocity defines a critical pressure below which splashing is suppressed.

Conclusions:

  • Ambient gas properties are crucial for splash sheet dynamics.
  • Spreading stage and surface roughness significantly alter splash behavior.
  • Understanding these factors is key to controlling or predicting liquid drop impact phenomena.