Deformation and motion behavior of water droplet under uniform and non-uniform electric field

作者：Chen Qingguo; Song Chunhui^*; Liang Wen; Liu Zeng; Zhao Zhongshan; Wei Xinlao

来源：High Voltage Engineering, 2016, 42(3): 949-958.

DOI：10.13336/j.1003-6520.hve.20160310013

• Collision probability
• Electric field force
• Electric field intensities
• Movement characteristics
• Nonuniform electric field
• Phase field methods
• Polarization charges
• Uniform electric fields

Droplet deformation and motion behavior under electric field are important contents in the research of electric dehydration mechanism. In order to research movement characteristics under different electric field types, a simulation model of droplet was established through the phase field method under uniform and non-uniform electric field. The distributions of charge density and electric field force on the droplet surface as well as the coupling effect of flow field and electric field were investigated during the process of droplet deformation, moving and coalescence. Moreover, the droplet deformation and motion behavior were simulated and analyzed under uniform and non-uniform electric field. The results show that the tensile deformation and migration of water droplets will both occur under AC non-uniform electric field. The distribution of polarization charges is different on the droplet surface under non-uniform electric field, increasing from the center to both ends of the droplet. The values of polarization charge and Maxwell stress at droplet's one end surface closed to electric field concentrated area are the largest. The electric field makes the surrounding fluid of water droplets to rotate and to generate different intensity flow fields, then the flow field and the dipole attraction force will both make the droplets coalescence rate faster. Within a certain range, the improvement of electric field intensity can increase collision probability and dipoalr interaction of water droplets under the non-uniform electric field when compared with uniform electric field. However, the higher strength of electric field can also make water droplets broken easily.

• 出版日期2016