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不同润滑液的电润湿性能研究
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国家自然科学基金项目(51205177);江苏省自然科学基金项目(BK2012277;BK20171307)


Electrowetting Performance Research of Different Lubricants
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    摘要:

    润湿性是指液体在固体表面铺展的倾向性,可以通过润湿角描述,是评价润滑液渗透性能的一个重要指标。为了研究润滑液的电润湿性,搭建电润湿润湿角测量装置,对施加负高电压的润滑液润湿角进行测量,得到不同电压下不同润滑液的润湿角变化情况,结合仿真分析施加负高压液滴润湿角变化机制。结果表明:润滑液润湿角受外加电场影响,在一定范围内,电压越大,润滑液润湿角越小;在润滑液中加入纳米颗粒可提高润滑液的电润湿性能;在同等电压下,与去离子水、去离子水基纳米流体、蓖麻油、蓖麻油基纳米流体、葵花油相比,葵花油基纳米流体的电润湿性能最好;对润滑液液滴施加电压后,液滴各位置压力场与速度场发生变化,其顶部压力场较大,速度指向液滴内部,边缘压力场较小,速度指向液滴外部,进而导致润湿角减小

    Abstract:

    Wettability refers to the tendency of the liquid to spread on the solid surface,which can be described by the wetting angle,and is an important index for evaluating the permeability of the lubricant.In order to study the electrowetting properties of the lubricating fluid,an electrowetting wetting angle measuring device was set up to measure the wetting angle of the lubricating fluid.A negative high voltage was applied to obtain the change of the wetting angle of different lubricating fluids under different voltages.The mechanism of the wetting angle of droplets with negative voltage was analyzed by simulation method.The results show that the wetting angle of the lubricating fluid is affected by the external electric field.In a certain range,the larger the voltage,the smaller the wetting angle of the lubricating fluid.Adding nanoparticles to the lubricating fluid can improve the electrowetting performance of the lubricating fluid.Under the same voltage,compared with deionized water,deionized waterbased nanofluid,castor oil,castor oil-based nanofluid,and sunflower oil,the sunflower oil-based nanofluid has the best electrowetting performance.After the voltage is applied to the droplet of lubricant liquid,the pressure field and velocity field at each position of droplet are changed.The pressure field at the top is larger,the velocity is directed to the inside of droplet,the edge pressure field is smaller,and the velocity is directed to the outside of droplet,which causes the reduction of wetting angle

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陈晓杰,苏宇.不同润滑液的电润湿性能研究[J].润滑与密封,2021,46(2):50-55.
CHEN Xiaojie, SU Yu. Electrowetting Performance Research of Different Lubricants[J]. Lubrication Engineering,2021,46(2):50-55.

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  • 在线发布日期: 2021-02-22
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