Frost-free zone on macrotextured surfaces

Proceedings of the National Academy of Sciences of the United States of America
Yuehan YaoKyoo-Chul Park

Abstract

Numerous studies have focused on designing functional surfaces that delay frost formation or reduce ice adhesion. However, solutions to the scientific challenges of developing antiicing surfaces remain elusive because of degradation such as mechanical wearing. Inspired by the discontinuous frost pattern on natural leaves, here we report findings on the condensation frosting process on surfaces with serrated structures on the millimeter scale, which is distinct from that on a conventional planar surface with microscale/nanoscale textures. Dropwise condensation, during the first stage of frosting, is enhanced on the peaks and suppressed in the valleys, causing frost to initiate from the peaks, regardless of surface chemistry. The condensed droplets in the valley are then evaporated due to the lower vapor pressure of ice compared with water, resulting in a frost-free zone in the valley, which resists frost propagation even on superhydrophilic surfaces. The dependence of the frost-free areal fraction on the geometric parameters and the ambient conditions is elucidated by both numerical simulations based on steady-state diffusion and an analytical method with an understanding of boundary conditions independent of surface chemistry. ...Continue Reading

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Citations

Apr 9, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Sunghwan Jung
Jul 1, 2021·ACS Applied Materials & Interfaces·Soumei BabaAtsushi Okamoto
Aug 7, 2021·Physical Review Letters·Hyunggon ParkJonathan B Boreyko
Dec 17, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·S Farzad AhmadiJonathan B Boreyko
Nov 12, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Donggyu Kim, Seunghwa Ryu
Aug 27, 2021·Science·Abhishek DhyaniAnish Tuteja
Sep 22, 2020·ACS Applied Materials & Interfaces·Yubo LiuFeng Zhou
Sep 4, 2021·The Journal of Physical Chemistry Letters·Shizhong ZhangJianjun Wang
Sep 10, 2021·Advanced Science·Feng WangZhiliang Zhang

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