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The Preparation of Electrohydrodynamic Bridges from Polar Dielectric Liquids
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How ice bridges the gap.

Saurabh Nath1, S Farzad Ahmadi, Jonathan B Boreyko

  • 1Department of Biomedical Engineering and Mechanics, Virginia Tech, Blacksburg, VA 24061, USA. boreyko@vt.edu.

Soft Matter
|December 13, 2019
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Summary
This summary is machine-generated.

Ice bridges propagate between supercooled dew droplets, freezing surfaces. Bridging success depends only on droplet geometry, not temperature or humidity, enabling models of freezing fronts.

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Area of Science:

  • Physics
  • Materials Science
  • Surface Science

Background:

  • Supercooled dew droplets on chilled surfaces can freeze via ice bridges.
  • Understanding ice bridge formation is key to controlling freezing phenomena.

Purpose of the Study:

  • Investigate conditions for ice dendrite bridging between droplets.
  • Model ice bridge growth and freezing front propagation.
  • Describe dry zone formation when bridging fails.

Main Methods:

  • Experimental observation of ice bridge formation across varying droplet sizes (1 μm-10 mm).
  • Geometric analysis of bridging criteria.
  • Modeling of individual ice bridge growth dynamics.
  • Modeling of global freezing front speed and dry zone formation.

Main Results:

  • Ice bridging is determined solely by geometric factors, independent of temperature, humidity, and wettability.
  • A dynamical law for dry zone formation was established.
  • Models for ice bridge growth and freezing front propagation were developed.

Conclusions:

  • Geometric constraints dictate ice bridging in supercooled droplet systems.
  • The findings enable prediction and control of freezing phenomena in diverse applications.
  • This study provides a fundamental understanding of ice propagation dynamics.