Yilbas Bekir Sami, Al-Sharafi Abdullah, Ali Haider, Al-Aqeeli Nasser, Al-Qahtani Hussain, Al-Sulaiman Fahad, Abu-Dheir Numan, Abdelmagid Ghassan, Elkhazraji Ali
Center of Excellence in Renewable Energy, King Fahd University of Petroleum & Minerals Dhahran Saudi Arabia
Mechanical Engineering Department, King Fahd University of Petroleum & Minerals Dhahran Saudi Arabia.
RSC Adv. 2018 Oct 2;8(59):33775-33785. doi: 10.1039/c8ra07503d. eCollection 2018 Sep 28.
The removal of environmental dust particles from optically transparent glass surfaces is considered, and the dynamics of the dust particles on the inclined hydrophobic glass surface is examined. The glass surfaces are coated by functionalized nano-sized silica particles to create a hydrophobic wetting state on the surface. A thin layer of environmental dust particles, collected from the local area of Dammam in the Kingdom of Saudi Arabia (KSA), is deposited on the surface while mimicking the dust accumulation on the surfaces in the dusty days of KSA. In order to increase the removal rate of the dust particles from the inclined hydrophobic glass surfaces, high density particles, which are higher than the density of the dust particles, are locally distributed on the dust particle-deposited surface while generating the avalanche influence on the inclined surface. The motion of the dust and high density particles on the inclined surface is monitored using a high speed camera. The predictions of the dust particles' acceleration and velocity are compared to those obtained from the high speed camera data. It is found that the predictions of velocity and acceleration of the dust particles agree well with the experimental data. Local insertion of the high density particles generates avalanche influence on the inclined surface while initiating the removal of the dust particles from the hydrophobic surface at small inclination angles. The size of the area where the dust particles are removed from the inclined surface increases with enlarging coverage area of the high density particles. The dust-removed surface, under the avalanche influence, improves the UV-visible transmittance of the hydrophobic glass.
研究了从光学透明玻璃表面去除环境灰尘颗粒的问题，并考察了灰尘颗粒在倾斜疏水玻璃表面上的动力学。玻璃表面涂覆有功能化纳米二氧化硅颗粒，以在表面形成疏水润湿状态。从沙特阿拉伯王国达曼当地收集的一层薄的环境灰尘颗粒沉积在表面上，同时模拟沙特阿拉伯多尘天气下表面的灰尘积累情况。为了提高倾斜疏水玻璃表面上灰尘颗粒的去除率，将高于灰尘颗粒密度的高密度颗粒局部分布在沉积有灰尘颗粒的表面上，同时在倾斜表面上产生雪崩效应。使用高速摄像机监测倾斜表面上灰尘和高密度颗粒的运动。将灰尘颗粒加速度和速度的预测结果与从高速摄像机数据获得的结果进行比较。结果发现，灰尘颗粒速度和加速度的预测结果与实验数据吻合良好。高密度颗粒的局部插入在倾斜表面上产生雪崩效应，同时在小倾斜角度下启动从疏水表面去除灰尘颗粒的过程。从倾斜表面去除灰尘颗粒的区域大小随着高密度颗粒覆盖面积的增大而增加。在雪崩效应下，去除灰尘后的表面提高了疏水玻璃的紫外可见透过率。
