Yilbas Bekir Sami, Abubakar Abba Abdulhamid, Adukwu Johnny Ebaika, Hassan Ghassan, Al-Qahtani Hussain, Al-Sharafi Abdullah, Unal Muhammet, Alzaydi Ammar
Mechanical Engineering Department, King Fahd University of Petroleum and Minerals (KFUPM) Dhahran 31261 Saudi Arabia
IRC for Renewable Energy and Power, King Fahd University of Petroleum and Minerals (KFUPM) Dhahran 31261 Saudi Arabia.
RSC Adv. 2022 Oct 10;12(44):28788-28799. doi: 10.1039/d2ra04845k. eCollection 2022 Oct 4.
An innovative method is introduced for environmental dust mitigation from a hydrophobic surface by a sessile water droplet. The sessile water droplet is located between two parallel plates having hydrophilic (at the top) and hydrophobic (at the bottom) states. The water droplet is located at the top hydrophilic plate, and the effect of the plate spacing on dust mitigation rate is examined. The droplet behavior is analyzed for different plate spacings and various droplet sizes using a high-speed camera. The fluid and the particle motions are simulated inside the droplet while adopting the experimental conditions. The findings demonstrate that the sessile droplet can effectively mitigate dust. Reducing the plate spacing increases the droplet meniscus diameter and enhances the dust removal rate. The surface tension force on the hydrophilic surface remains greater than that of the pinning force on the dusty hydrophobic surface even though the Magdeburg and surface tension forces contribute to the droplet pinning force on the hydrophobic dusty surface. Flow current is developed in the droplet fluid during the squeezing period, which considerably enhances the dust removal rate from the hydrophobic surface. The cleaned area increases with the droplet volume and plate spacing. Stria patterns are observed on the circumference of the dust-removed area. The present study provides a detailed analysis of a new method of dust removal from surfaces for self-cleaning applications.
介绍了一种通过静止水滴减轻疏水表面环境灰尘的创新方法。静止水滴位于具有亲水（顶部）和疏水（底部）状态的两个平行板之间。水滴位于顶部亲水板上，并研究了板间距对灰尘减轻率的影响。使用高速相机分析了不同板间距和各种水滴尺寸下的水滴行为。在采用实验条件的同时，模拟了水滴内部的流体和颗粒运动。研究结果表明，静止水滴可以有效地减轻灰尘。减小板间距会增加水滴弯月面直径并提高除尘率。即使马格德堡力和表面张力对疏水灰尘表面上的水滴钉扎力有贡献，亲水表面上的表面张力仍大于多尘疏水表面上的钉扎力。在挤压期间，水滴流体中会产生流动电流，这大大提高了从疏水表面的除尘率。清洁面积随水滴体积和板间距的增加而增大。在除尘区域的圆周上观察到条纹图案。本研究对用于自清洁应用的表面除尘新方法进行了详细分析。
