Abstract

Plate separators are widely used for oil-water separation in the petrochemical industry. The microscopic adhesion behavior of oil droplets at the solid surface is the key to understanding the oil-water separation mechanism in the plate separator. However, published microscopic experiments and mechanism research is insufficient. This study experimentally investigates the process of oil droplets impacting solid surfaces of Polytetrafluoroethylene (PTFE), 304 stainless steel, and Polyvinyl chloride using a high-speed camera. The influences of solid surfaces with different wettability and inclined angles from 0° to 45° are studied. The results show that oil droplets have the shortest drainage time and the greatest spreading speed on PTFE plates. The drainage time on an inclined surface is significantly longer than on a horizontal plate, and increases as the angle increases. The maximum spreading length occurs at an inclined angle of 15°, and is less affected by the angle as the Weber number (We) decreases. This study facilitates the understanding of oil droplet adhesion on a coalescing material surface in a plate separator from a microscopic view.

摘要

板式分离器广泛用于石油化工行业的油水分离。油滴在固体表面的微观粘附行为是理解板式分离器中油水分离机理的关键。然而，已发表的显微实验和机理研究还不够充分。本研究使用高速摄像机实验研究了油滴撞击聚四氟乙烯 (PTFE)、304 不锈钢和聚氯乙烯固体表面的过程。研究了具有不同润湿性和0°至45°倾斜角的固体表面的影响。结果表明，油滴在聚四氟乙烯板上的排水时间最短，铺展速度最快。倾斜表面的排水时间明显长于水平板，并且随着角度的增加而增加。最大传播长度出现在 15° 的倾斜角处，并且受角度的影响较小，如韦伯数（我们）减少。这项研究有助于从微观角度理解板式分离器中聚结材料表面上的油滴粘附。