Effect of salt concentration and type on polarization and deformation of water droplet during electric dehydration

FAN Yuxin; LI Bin; SUN Zhiqian; WANG Zhenbo; JIN Youhai

doi:10.11949/j.issn.0438-1157.20160372

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Effect of salt concentration and type on polarization and deformation of water droplet during electric dehydration

更新时间：2025-12-10

- Effect of salt concentration and type on polarization and deformation of water droplet during electric dehydration
- CIESC Journal Issue 8, Pages: 3297-3303(2016)
- 作者机构：
  
  1. 中国石油大学(华东)化学工程学院,山东,青岛,266580
  2. 新疆油田公司风城油田作业区,新疆,克拉玛依,834000
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20160372
  CLC： E642.1
- Online First：05 August 2016，
  
  Published：05 August 2016
- 稿件说明：
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FAN Yuxin, LI Bin, SUN Zhiqian, et al. Effect of salt concentration and type on polarization and deformation of water droplet during electric dehydration[J]. CIESC Journal, 2016, (8): 3297-3303.
DOI：

FAN Yuxin, LI Bin, SUN Zhiqian, et al. Effect of salt concentration and type on polarization and deformation of water droplet during electric dehydration[J]. CIESC Journal, 2016, (8): 3297-3303. DOI： 10.11949/j.issn.0438-1157.20160372.

摘要

为了深入探究无机盐对电脱水过程水滴极化的影响机理，分别改变无机盐浓度及种类，对高频高压脉冲电场作用下水滴的极化变形进行显微实验研究。结果表明，不同NaCl浓度条件下水滴的变形度随电场频率和占空比的增加呈先增大后降低，由于电导率增大、离子冲击效应等的影响，随着NaCl浓度的增大，水滴的变形度随之增大。高价无机盐离子所受的电场力是一价离子的数倍，有利于其冲击速度和冲击动量的提升，水滴变形度随离子价位升高而增大。另外，由于离子活泼程度以及水解等原因，在同一高压脉冲电场中，不同钠盐溶液水滴变形度顺序为：磷酸钠 >碳酸钠 >硫酸钠 >氯化钠 >硝酸钠。不同氯盐溶液水滴变形度顺序为：氯化镁 >氯化钙 >氯化钾 >氯化钠 >氯化铵。研究成果为高压高频脉冲静电破乳机理的深入探讨奠定了基础。

Abstract

In order to explore mechanism of concentration and type of inorganic salts on polarization and deformation of water droplet during electric dehydration

water droplets of various salt concentrations and types were studied microscopically in pulsed electric field of both high frequency and high voltage. Water droplets of all tested sodium chloride (NaCl) concentrations showed a trend that the deformation degree increased first but decreased later when the electric frequency and duty ratio were increased. The deformation degree of water droplet increased with increase of NaCl concentration

as a result of increased electric conductivity and ion collision. The electric force on multivalent ions

which is several times stronger than that on monovalent ions

enhanced velocity and momentum of their collision

so the deformation degree of water droplet increased upon increase of ionic valence. Furthermore

the ion activity and hydrolysis affected the deformation degree. In the same high-voltage pulsed electric field

the deformation degree of sodium-containing water droplets changed in the order from high to low as Na3PO4> Na2CO3> Na2SO4> NaCl> NaNO3 whereas that of chlorine-containing water droplets changed in the order as MgCl2> CaCl2> KCl> NaCl> NH4ClCl. The experimental findings shall facilitate investigating mechanism of electrostaticde-emulsification at high voltage and high frequency.

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