文献类型：期刊文献

英文题名：Interfacial Behavior and Internal Microflow of an Oil Droplet during the Process of the Oil Droplet Covering a Gas Bubble: Without and with NaCl

作者：Yan, Shenglin[1];Zhang, Yan[1];Yang, Xiaoyong[1];Huang, Yuan[2];Bai, Zhishan[1];Xu, Xiao[1]

机构：[1]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asse, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[2]Shanghai Univ, Inst Environm Pollut & Hlth, Sch Environm & Chem Engn, Shanghai 200444, Peoples R China

年份：2021

卷号：60

期号：16

起止页码：6006

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20211810307622);WOS:【SCI-EXPANDED(收录号:WOS:000645515800025)】；

基金：This research was supported by the National Natural Science Foundation of China, China (51578239) and the Education and Scientific Research Projects of Shanghai, China (17DZ1202802) for which the authors express their appreciation.

语种：英文

外文关键词：Bubbles (in fluids) - Froth flotation - Sodium chloride - Drops - Wave propagation

摘要：Flotation is an efficient pretreatment technology for oily water. In this paper, the effect of NaCl concentration on the process of an oil droplet covering a gas bubble was investigated experimentally. The results show that capillary waves are formed on the surface of the oil droplet during the coverage process. After capillary wave propagation, the surface of the droplet will form a constricted neck area, and the interfacial force of this area generates negative pressure, which induces the bubble to enter the inside of the oil droplet. The increase in NaCl concentration in water makes the neck area have greater suction. This results in the oil droplet stretching the bubbles more vigorously, promotes the spreading of the oil droplet on the surface of the bubble, and shortens the covering time. Moreover, in water with higher NaCl concentration, there is a greater flow velocity in the confluence region of the oil droplet.