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高压脉冲静电破乳过程水滴的破碎临界电场参数
孙治谦,金有海,王振波
(中国石油大学 化学工程学院, 山东 青岛 266580)
摘要:
通过显微试验考察水滴在高压高频脉冲电场作用下的极化变形及失稳破碎过程,研究水滴破碎临界场强、占空比及电场频率的变化规律。结果表明:随占空比的增加,作用于水滴的电场能随之增大,同一脉冲周期内电场施加时间增长,水滴破碎临界场强减小;随电场强度的增加,水滴的极化变形效应愈加明显,水滴的变形弛豫时间缩短,破碎临界占空比减小,临界占空比最小值所对应的电场频率逐渐降低;电场强度一定时,随占空比的增大,水滴的破碎临界频率呈现先增大、后减小的趋势;电场强度、占空比及电场频率三者共同决定了水滴的极化弛豫状态、作用于水滴的电场能以及水滴的振荡频率,其交互作用对水滴的破碎具有重要影响。
关键词:  水处理  脉冲  静电破乳  极化  临界电场参数
DOI:10.3969/j.issn.1673-5005.2013.01.023
分类号::TE 642.1
基金项目:中央高校基本科研业务费专项资金 (27R1204021A)
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
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