Zheng Xiaojing, Zhang Rui, Huang Haojie
1] School of Electronic and Mechanical Engineering, Xidian University, Xi'an, 710071, China [2] Key Laboratory of Mechanics on Environment and Disaster in Western China, Ministry of Education, Lanzhou University, Lanzhou 730000, People's Republic of China.
Key Laboratory of Mechanics on Environment and Disaster in Western China, Ministry of Education, Lanzhou University, Lanzhou 730000, People's Republic of China.
Sci Rep. 2014 Mar 18;4:4399. doi: 10.1038/srep04399.
Contact electrification of identical insulating particles has crucial significance for industrial and environmental science, especially in wind-blown granular systems. At the same time, the experimental phenomena of charge transfer first increased and then decreased with the increase of relative humidity has attracted the interest of many researchers. Humidity can affect the charge transfer has been early observed in the experiment, but the reason always puzzles researchers. In this study, based on trapped high-energy electron transfer mechanism, we introduce the effect of the water film in the charge transfer model and consider the actual situations of the sand particles in the collision process. Furthermore, charge transfer between sand particles in a single collision under different humidity conditions is investigated. The predicted results agree well with the law obtained in existing experiments qualitatively and thereby a possible explanation why humidity can affect the charge transfer is given.
相同绝缘颗粒的接触起电对工业和环境科学具有至关重要的意义，特别是在风沙颗粒系统中。同时，电荷转移实验现象随相对湿度增加先增大后减小，这引起了许多研究人员的兴趣。湿度会影响电荷转移这一点在实验中早已被观察到，但原因一直困扰着研究人员。在本研究中，基于俘获高能电子转移机制，我们在电荷转移模型中引入水膜的影响，并考虑沙粒碰撞过程中的实际情况。此外，研究了不同湿度条件下单次碰撞下沙粒间的电荷转移。预测结果与现有实验得到的规律在定性上吻合良好，从而给出了湿度为何会影响电荷转移的一种可能解释。
