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Electrostatic Jumping of Frost.

Ranit Mukherjee¹, S Farzad Ahmadi^2,3, Hongwei Zhang²

¹Department of Biomedical Engineering and Mechanics, Virginia Tech, Blacksburg, Virginia 24061, United States.

|February 24, 2021

Summary

Spontaneous ice electrification causes frost dendrites to jump. This phenomenon, observed using high-speed imaging, offers insights into atmospheric charge separation and potential deicing applications.

Keywords:

condensation frosting deicing electric polarization electrostatic force ionic transport jumping frost

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Area of Science:

Physics
Materials Science
Atmospheric Science

Background:

Electrification of ice has been studied since 1940, primarily concerning charge generation in thunderstorms.
Spontaneous charge generation in ice is distinct from external electric field effects on crystal growth.

Purpose of the Study:

To investigate the phenomenon of jumping frost dendrites.
To understand the underlying mechanisms of spontaneous ice electrification and its effects.

Main Methods:

Experimental observation using side-view high-speed imaging.
Development of analytical and numerical models to estimate attractive forces.
Analysis of charge separation within growing frost sheets.

Main Results:

Frost dendrites were observed to break off and jump out-of-plane towards opposing polar liquids.
Models accurately estimated the attractive force between frost dendrites and liquids.
Charge separation in frost is linked to differing mobilities of charge carriers in ice.

Conclusions:

Jumping frost dendrites present a novel phenomenon driven by spontaneous ice electrification.
This system can model charge separation in atmospheric ice.
Potential applications include deicing constructs.