Han Yunrui, Wang Shipeng, Zhou Rifeng, He Limin, Luo Xiaoming
State Key Laboratory of Safety and Control for Chemicals , SINOPEC Research Institute of Safety Engineering , Qingdao 266580 , P. R. China.
Langmuir. 2020 Jan 14;36(1):109-118. doi: 10.1021/acs.langmuir.9b03456. Epub 2019 Dec 31.
In this article, the rising trajectories of oil droplets near the substrates of small channels in the laminar flow field were observed using a high-speed camera. Chemical modifications were made on the surfaces of the brass sheets to change the surface properties, and the controllable regulation of the superoleophilic-superoleophobic wettability gradient was achieved. The adhesion behaviors of the oil droplets on surfaces with different wettabilities at different flow velocities were observed as well. According to the adhesion behaviors of oil droplets on surfaces with different wettabilities, a mathematical model was established to analyze water film thinning and the adherence of oil droplets on the wall in the laminar flow field. Then the quantitative relationships among the adhesion times of oil droplets on different wetting surfaces, oil and water properties, and surface wettability were acquired.
在本文中，使用高速摄像机观察了层流场中小通道基底附近油滴的上升轨迹。对黄铜片表面进行化学改性以改变表面性质，实现了超亲油-超疏油润湿性梯度的可控调节。还观察了不同流速下油滴在不同润湿性表面上的粘附行为。根据油滴在不同润湿性表面上的粘附行为，建立了数学模型来分析层流场中水膜变薄和油滴在壁面上的附着情况。进而获得了油滴在不同润湿表面上的粘附时间、油和水的性质以及表面润湿性之间的定量关系。
