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倾斜疏水表面上的水滴钉扎与传热特性

A Water Droplet Pinning and Heat Transfer Characteristics on an Inclined Hydrophobic Surface.

作者信息

Al-Sharafi Abdullah, Yilbas Bekir Sami, Ali Haider, AlAqeeli N

机构信息

Mechanical Engineering Department and Centre of Excellence in Renewable Energy, King Fahd University of Petroleum & Minerals, Dhahran, Saudi Arabia.

Center of Research Excellence in Renewable Energy (CoRE-RE), King Fahd University of Petroleum and Minerals (KFUPM), Dhahran, 31261, Saudi Arabia.

出版信息

Sci Rep. 2018 Feb 15;8(1):3061. doi: 10.1038/s41598-018-21511-w.

DOI:10.1038/s41598-018-21511-w
PMID:29449624
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5814416/
Abstract

A water droplet pinning on inclined hydrophobic surface is considered and the droplet heat transfer characteristics are examined. Solution crystallization of polycarbonate is carried out to create hydrophobic characteristics on the surface. The pinning state of the water droplet on the extreme inclined hydrophobic surface (0° ≤ δ ≤ 180°, δ being the inclination angle) is assessed. Heat transfer from inclined hydrophobic surface to droplet is simulated for various droplet volumes and inclination angles in line with the experimental conditions. The findings revealed that the hydrophobic surface give rise to large amount of air being trapped within texture, which generates Magdeburg like forces between the droplet meniscus and the textured surface while contributing to droplet pinning at extreme inclination angles. Two counter rotating cells are developed for inclination angle in the range of 0° < δ < 20° and 135° < δ < 180°; however, a single circulation cell is formed inside the droplet for inclination angle of 25° ≤ δ ≤ 135°. The Nusselt number remains high for the range of inclination angle of 45° ≤ δ ≤ 135°. Convection and conduction heat transfer enhances when a single and large circulation cell is formed inside the droplet.

摘要

研究了倾斜疏水表面上的水滴钉扎现象，并考察了水滴的传热特性。通过聚碳酸酯的溶液结晶在表面形成疏水特性。评估了水滴在极端倾斜疏水表面（0°≤δ≤180°，δ为倾斜角）上的钉扎状态。根据实验条件，针对不同的液滴体积和倾斜角，模拟了从倾斜疏水表面到液滴的传热。研究结果表明，疏水表面会导致大量空气被困在纹理中，这在液滴弯月面和纹理表面之间产生类似马格德堡力的力，同时有助于在极端倾斜角下实现液滴钉扎。对于0°＜δ＜20°和135°＜δ＜180°范围内的倾斜角，会形成两个反向旋转的单元；然而，对于25°≤δ≤135°的倾斜角，液滴内部会形成一个单一的循环单元。在45°≤δ≤135°的倾斜角范围内，努塞尔数保持较高。当液滴内部形成一个单一的大循环单元时，对流和传导传热会增强。

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