کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4981604 1453836 2018 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Droplet splitting on chemically striped surface
ترجمه فارسی عنوان
قطره قطره در سطح شیمیایی راه راه
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
چکیده انگلیسی

After a hydrophilic surface is partially coated with a superhydrophobic material, the resulting chemically patterned surface has a strong ability to split droplets. For example, a 2.54-mm-diameter water droplet impinging on a chemically striped surface at 0.58 m/s can split off a satellite droplet. In this article, the droplet splitting behavior is investigated by the coupled level set/volume-of-fluid method. It is found that as the impact velocity increases, the number of satellite droplets tends to rise. When the impact velocity reaches 1.69 m/s, a large number of satellite droplets are produced, increasing the length of the triple-phase contact line. Compared with that on an uncoated hydrophilic surface, the triple-phase contact line length of a droplet impinging on the chemically striped surface improves by 81.93% at the same impact velocity, and the longer triple-phase contact line can greatly enhance droplet evaporation on a hot surface. Furthermore, the impact position of the droplet significantly affects the length of the triple-phase contact line. When the droplet strikes a hydrophilic stripe, the triple-phase contact line length can be greatly enlarged (by 169.66%). Moreover, the mechanism of droplet splitting can be explained as follows: a pressure difference caused by the hysteretic movement of the liquid on the superhydrophobic stripes forces the liquid to move away from the superhydrophobic area to the hydrophilic area.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 537, 20 January 2018, Pages 139-148
نویسندگان
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