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Critical electric field parameters of water droplet broken-up in high voltage impulse electrostatic demulsification process
SUN Zhi-qian, JIN You-hai, WANG Zhen-bo
(College of Chemical Engineering in China University of Petroleum, Qingdao 266580, China)
Abstract:
Based on microscopic experiment, the polarization deformation and destabilization process of water droplet under high-voltage and high-frequency electric field were deeply investigated, and the variation characteristics of critical electric field parameters were summarized. The results show that, with duty ratio increasing, electric field energy acting on the droplet and acting time of electric field in a impluse cycle simultaneously increase, and the broken-up critical field intensity decreases. With electric field intensity increasing, the polarization deformation effect of water droplet becomes increasingly important, deformation relaxation time shortens, broken-up critical duty ratio decreases, and the electric field frequency corresponding to the minimum value of critical duty ratio gradually decreases. The critical frequency increases firstly and reduces afterward with the increase of duty ratio in condition of constant electric field intensity. The polarization and relaxation state, electric field energy acting on the droplet and droplet oscillation frequency are dependent on electric field intensity, critical duty ratio and field frequency. The interaction plays an important role in the destabilization behavior of water droplet.
Key words:  water treatment  impulse  electrostatic demulsification  polarization  critical electric field parameter