Prediction model of volume average diameter and analysis of atomization characteristics in electrostatic atomization minimum quantity lubrication  

作　　者：Dongzhou JIA Changhe LI Jiahao LIU Yanbin ZHANG Min YANG Teng GAO Zafar SAID Shubham SHARMA 

机构地区：[1]School of Mechanical&Automotive Engineering,Qingdao University of Technology,Qingdao 266520,China [2]College of Mechanical Engineering and Automation,Liaoning University of Technology,Jinzhou 121001,China [3]State Key Laboratory of Ultra-precision Machining Technology,Department of Industrial and Systems Engineering,The Hong Kong Polytechnic University,Hong Kong 999077,China [4]College of Engineering,University of Sharjah,Sharjah 27272,United Arab Emirates [5]Mechanical Engineering Department,University Center for Research and Development,Chandigarh University,Mohali,Punjab 144603,India

出　　处：《Friction》2023年第11期2107-2131,共25页摩擦（英文版）

基　　金：This research was financially supported by the National Natural Science Foundation of China(Grant Nos.52105457 and 51975305);the National Key R&D Program of China(Grant No.2020YFB2010500);Major Science and Technology Innovation Engineering Projects of Shandong Province(Grant No.2019JZZY020111);General project of Liaoning Provincial Department of Education(Grant No.LJKMZ20220971).

摘　　要：Minimum quantity lubrication(MQL)is a relatively efficient and clean alternative to flooding workpiece machining.Electrostatic atomization has the merits of small droplet diameter,high uniformity of droplet size,and strong coating,hence its superiority to pneumatic atomization.However,as the current research hotspot,the influence of jet parameters and electrical parameters on the average diameter of droplets is not clear.First,by observing the shape of the liquid film at the nozzle outlet,the influence law of air pressure and voltage on liquid film thickness(h)and transverse and longitudinal fluctuations are determined.Then,the mathematical model of charged droplet volume average diameter(VAD)is constructed based on three dimensions of the liquid film,namely its thickness,transverse wavelength(λ_(h)),and longitudinal wavelength(λ_(z)).The model results under different working conditions are obtained by numerical simulation.Comparisons of the model results with the experimental VAD of the droplet confirm the error of the mathematical model to be less than 10%.The droplet diameter distribution span value Rosin–Rammler distribution span(R.S)and percentage concentrations of PM10(particle size of less than 10μm)/PM2.5(particle size of less than 2.5μm)under different working conditions are further analyzed.The results show that electrostatic atomization not only reduces the diameter distribution span of atomized droplets but also significantly inhibits the formation of PM10 and PM2.5 fine-suspension droplets.When the air pressure is 0.3 MPa,and the voltage is 40 kV,the percentage concentrations of PM10 and PM2.5 can be reduced by 80.72%and 92.05%,respectively,compared with that under the pure pneumatic atomization condition at 0.3 MPa.

关 键 词：minimum quantity lubrication(MQL) electrostatic atomization volume average diameter(VAD) atomization characteristics 

分 类 号：TH117.2[机械工程—机械设计及理论]