Using Frost to Promote Cassie Ice on Hydrophilic Pillars

Hyunggon Park, S. Farzad Ahmadi, and Jonathan B. Boreyko

Phys. Rev. Lett. 127, 044501 – Published 22 July 2021

Abstract

We develop a novel approach to suspend ice in the air-trapping Cassie state without requiring any fragile hydrophobic coatings or nanostructures. First, frost was preferentially grown on the tops of hydrophilic aluminum pillars due to their sharp corners and elevation over the noncondensable gas barrier. Subsequently, Cassie ice was formed by virtue of the impacting droplets getting arrested by the upper frost tips. A scaling model reveals that the dynamic pressure of an impacting droplet causes the water to wick inside the porous frost faster than the timescale to impale between the pillars.

Received 8 December 2020
Revised 24 May 2021
Accepted 17 June 2021

DOI:https://doi.org/10.1103/PhysRevLett.127.044501

Physics Subject Headings (PhySH)

Liquid-solid phase transition Surface tension effects Wetting

Drops & bubbles

Fluid DynamicsInterdisciplinary Physics

Authors & Affiliations

Hyunggon Park ¹, S. Farzad Ahmadi ^2,3, and Jonathan B. Boreyko ^2,*

¹Department of Biomedical Engineering and Mechanics, Virginia Tech, Blacksburg, Virginia 24061, USA
²Department of Mechanical Engineering, Virginia Tech, Blacksburg, Virginia 24061, USA
³Department of Mechanical Engineering, University of California Santa Barbara, Santa Barbara, California 93106, USA

^*boreyko@vt.edu

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Issue

Vol. 127, Iss. 4 — 23 July 2021

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