What is it about?

We measure the freezing time and shapes of impinged water droplets on cold glass surfaces having microgrooves and silane coating. The results show the grooves and coating are effective in delaying the freezing of impinged droplets. This delay is less evident for precooled droplets probably because of supercool elimination and frost sublimation.

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Why is it important?

During wintry weather, the freezing of impinged cold raindrops on glass surfaces causes serious problems, such as reduced visibility of traffic lights and surveillance cameras and the lowering of solar panel performance. However, experimental results on the freezing of precooled impinged droplets on cold glass surfaces are limited. Our results can contribute to developing novel glass surfaces to delay the freezing.

Perspectives

Further delay of the freezing of impinged droplets is expected to be achieved in future experiments. This will be done using tilted surfaces and higher impact velocities, which are more realistic for automobile windshields, aircraft front windows, and solar panels.

Yoshimichi Hagiwara
Kyoto Institute of Technology

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This page is a summary of: Retardation of freezing of precooled, impinged water droplets on glass surfaces with microgrooves and silane coating, The Journal of Chemical Physics, September 2022, American Institute of Physics, DOI: 10.1063/5.0097511.
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