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Appl. Sci. 2017, 7(2), 130; doi:10.3390/app7020130

Supercooled Water Droplet Impacting Superhydrophobic Surfaces in the Presence of Cold Air Flow

Department of Mechanical and Industrial Engineering, Concordia University, Montreal, QC H3G 2W1, Canada
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Author to whom correspondence should be addressed.
Academic Editor: Serafim Kalliadasis
Received: 5 December 2016 / Accepted: 20 January 2017 / Published: 26 January 2017
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Abstract

In the present work, an investigation of stagnation flow imposed on a supercooled water drop in cold environmental conditions was carried out at various air velocities ranging from 0 (i.e., still air) to 10 m/s along with temperature spanning from −10 to −30 °C. The net effect of air flow on the impacting water droplet was investigated by controlling the droplet impact velocity to make it similar with and without air flow. In cold atmospheric conditions with temperatures as low as −30 °C, due to the large increase of both internal and contact line viscosity combined with the presence of ice nucleation mechanisms, supercooled water droplet wetting behavior was systematically affected. Instantaneous pinning for hydrophilic and hydrophobic surfaces was observed when the spread drop reached the maximum spreading diameter (i.e., no recoiling phase). Nevertheless, superhydrophobic surfaces showed a great repellency (e.g., contact time reduction up to 30% where air velocity was increased up to 10 m/s) at temperatures above the critical temperature of heterogeneous ice nucleation (i.e., −24 °C). However, the freezing line of the impacting water droplet was extended up to 2-fold at air velocity up to 10 m/s where substrate temperature was maintained below the aforementioned critical temperature (e.g., −30 °C). View Full-Text
Keywords: supercooled water droplet; superhydrophobic surface; evaporating cooling; homogeneous and heterogeneous ice nucleation supercooled water droplet; superhydrophobic surface; evaporating cooling; homogeneous and heterogeneous ice nucleation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Mohammadi, M.; Tembely, M.; Dolatabadi, A. Supercooled Water Droplet Impacting Superhydrophobic Surfaces in the Presence of Cold Air Flow. Appl. Sci. 2017, 7, 130.

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