电场和温度协同作用对纳米SiO2改性绝缘油中水分子扩散行为的影响  

Effects of Electric Field and Temperature Synergism on Diffusion Behavior of Water Molecules in Nano-SiO Modified Insulating Oil

作　　者：邱秦攀 张静文 王谦 刘熊 田汶鑫 唐超[1] QIU Qinpan;ZHANG Jingwen;WANG Qian;LIU Xiong;TIAN Wenxin;TANG Chao(College of Engineering and Technology,Southwest University,Chongqing 400715,China;Electric Power Research Institute of State Grid Chongqing Electric Power Company,Chongqing 401123,China)

机构地区：[1]西南大学工程技术学院,重庆400715 [2]国网重庆市电力公司电力科学研究院,重庆401123

出　　处：《绝缘材料》2021年第3期36-41,共6页Insulating Materials

基　　金：国家自然科学基金资助项目(51977179);中央高校基本科研业务费专项资金(XDJK2020D018);国家电网公司总部科技项目(SGKJHHJYY2018001)。

摘　　要：利用分子模拟技术研究了电场和温度对纳米SiO2改性绝缘油中水分子扩散行为的影响。结果表明:电场会使水分子发生极化,使得水分子由原本的无序排列变为沿着电场方向的有序排列。因此,电场的加入减弱了水分子的布朗运动,降低了水分子在油中的扩散能力;而且电场的加入增强了水分子与油介质之间的静电作用力,其数值是无电场作用下的2~3倍,这也是电场作用下两者间相互作用能增大的主要原因。此外,在电场的作用下,模型的自由体积分数减小,温度对模型中O原子和H原子之间氢键的影响减弱。The effects of electric field and temperature on the diffusion behavior of water molecules in nano-SiO2 modified insulating oil were studied by molecular simulation technology. The results show that the water molecules are polarized under electric field, and the water molecules would change from an original disordered arrangement to an ordered arrangement along the direction of electric field. Therefore, under the action of electric field,the Brownian motion of water molecules weakens, and the diffusion ability of water molecules in oil decreases.The electrostatic force between water molecules and oil medium was enhanced by electric field, which is 2-3 times bigger than that without electric field. This is also the main reason for the increase of interaction energy between water molecules and oil medium under electric field. In addition, under the action of electric field, the free volume fraction of the model decreases, and the effect of temperature on the hydrogen bond between O and H atoms in the model weakens.

关 键 词：绝缘油 纳米粒子 分子模拟 相互作用能 自由体积 

分 类 号：TM214[一般工业技术—材料科学与工程]