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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Fast Imaging Technique to Study Drop Impact Dynamics of Non-Newtonian Fluids
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Reducing the Bounce Height during Truncated Spherical Drop Impact on a Solid Surface.

Sungchan Yun1

  • 1Department of Mechanical Engineering , Korea National University of Transportation , Chungju 27469 , Republic of Korea.

Langmuir : the ACS Journal of Surfaces and Colloids
|June 14, 2018
PubMed
Summary
This summary is machine-generated.

Altering a droplet's shape before impact significantly reduces its bounce height. This controlled drop dynamics offers new possibilities for surface coating and spray cooling applications.

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Area of Science:

  • Fluid dynamics
  • Surface science
  • Materials science

Background:

  • Controlling droplet dynamics on surfaces is crucial for efficient deposition.
  • Current strategies often assume axisymmetrical droplet behavior, which may not be optimal.

Purpose of the Study:

  • To investigate the impact dynamics of non-spherical (truncated) droplets.
  • To demonstrate how shape deformation influences droplet bounce height and deposition.

Main Methods:

  • Experimental and numerical simulations were employed.
  • Droplet impact dynamics were analyzed for truncated spherical shapes.
  • Key parameters studied included truncation depth, surface wettability, and impact velocity.

Main Results:

  • Truncated spherical droplets exhibit unique rim dynamics upon impact.
  • Bounce heights were reduced by up to 56% compared to spherical droplets.
  • Momentum analysis elucidated the mechanisms behind reduced bounce height.

Conclusions:

  • Droplet shape significantly impacts impact dynamics and bounce behavior.
  • Non-spherical droplet impact offers enhanced control for deposition processes.
  • This research opens avenues for improved surface coating and spray cooling technologies.