基于双色荧光法的乳化液流体动压润滑界面影响机理研究  

Mechanism of Wettability Interface of Emulsion in Hydrodynamic Based on Dichromatic Fluorescence Method

作　　者：吕春风 韩素立 刘玉健 郭峰 邵晶[1,2] 薛子煜 LV Chunfeng;HAN Suli;LIU Yujian;GUO Feng;SHAO Jing;XUE Ziyu(School of Mechanical&Automotive Engineering,Qingdao University of Technology,Shandong Qingdao 266520,China;Key Lab of Industrial Fluid Energy Conservation and Pollution Control of Ministry of Education,Qingdao University of Technology,Shandong Qingdao 266520,China)

机构地区：[1]青岛理工大学机械与汽车工程学院,山东青岛266520 [2]青岛理工大学工业流体节能与污染控制教育部重点实验室,山东青岛266520

出　　处：《摩擦学学报(中英文)》2024年第12期1662-1672,共11页Tribology

基　　金：山东省自然科学基金项目(ZR2022ME191);山东省重点研发计划项目(2019GGX101014);国家自然科学基金项目(51605239)资助。

摘　　要：利用面接触润滑油膜测量系统,结合双色荧光法,研究流体动压润滑中不同表界面对乳化液成膜机理的影响.通过对钢块表面涂覆AF (Anti Finger Print)和FAS (Fluorodecyl-trimethoxysilane)进行疏水疏油处理,采用光干涉法测量乳化液流体动压油膜厚度,结果显示乳化液的油膜厚度受到固/液界面润湿性的影响.具体来说,在充分供油条件下,AF表面的油膜厚度最高,其次是Steel表面,而FAS表面的油膜厚度最低.运用双色荧光法观察到乳化液的油水两相在竞争吸附行为中存在差异,在固体表面,油相分子优先黏附于固体表面形成有效油膜.乳化液与不同表面接触时,在AF表界面分离油相与界面所需克服的黏附功最大,Steel表面次之,FAS表面最小,与油膜厚度试验结果相吻合.Emulsions are widely used in fields such as rolling and cutting,and the lubrication mechanism of emulsions has been continuously improved.However,there are relatively few research results on emulsions in fluid dynamic pressure lubrication.In order to further investigate the lubrication mechanism of emulsions at the interface of fluid dynamic pressure lubrication,Nile red,fluorescent agent with the concentration of 0.5 mmol/L,was added to the emulsion to label the oil phase,and water-soluble fluorescent probe PEG carboxylated CdSe/ZnS was added to label the aqueous phase,in which the fluorescence excitation at the aqueous phase fluorescent probe was red and the fluorescence at the excitation of the oil phase fluorescent probe was green.The bearing steel blocks were coated with AF and FAS with different degrees of hydrophobicity and oleophobicity to observe the competitive adsorption behaviors of the oil and water phases at different surface interfaces during the movement process.The emulsion after fluorescent labeling treatment was diluted by 10% concentration gradient,and the minimum film thickness in emulsion lubrication at different surface interfaces was measured by optical interferometry,and the competitive migration behavior of the oil and water phases in the contact zone and the surrounding pool of emulsion was observed by dichromatic fluorescence method.The results showed that the diluted emulsion still had a good film-forming ability,and the emulsion film thickness was positively correlated with the size of the coiling and suction speeds,but the size of the film thickness at different speeds would appear cross phenomena.The film-forming ability of the emulsion was different at different surface interfaces,in which the film thickness was highest on the AF surface,second on the Steel surface,and lowest on the FAS surface.Observing the change of the oil pool during the motion,the shape of the emulsion pool would change with the change of speed,and part of the emulsion would pass directly through the contact

关 键 词：流体动压润滑 乳化液 双色荧光法 光干涉法 油膜厚度 

分 类 号：TH117.2[机械工程—机械设计及理论]