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Fundamental studies of liquid-liquid contractor using of pulsed electric field

脉冲电场液-液接触器的基础研究

基本信息

批准号：
10650753
负责人：
YAMAGUCHI Manabu
金额：
$ 0.7万
依托单位：
Himeji Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650753/
关键词：
Pulsed Electric Field Liquid Liquid Contactor Drop Breakup Drop Coalescence Drop Deformation Drop Motion Elastic Film 電場液滴内外流動界面弾性率液液接触液液分散液滴分散

项目摘要

1. A small box-type equipment with two electrodes was devised and deformation and breakup processes of single water drops in an oil phase under external electric fields were investigated experimentally by using of a video-camera. Experimental deformation degrees of the drops were in good agreement with theoretical ones. Also a new dimensionless graph for breakup criterion of the drops was proposed using of the experimental data of drop-breakup.2. A new large scale liquid-liquid contactor with vertical two-plate electrodes was devised. The population behavior of dispersed drops in a pulsed electric field was investigated experimentally. It was clarified that electrohydrodynamic cycles of dispersion of the drop phase/mixing of the continuous phase/coalescing-settling of the drop phase were attained on the drops falling through the imposed pulsed field.3. The dissolving materials in the crude oil adsorbed on the surface of the drop and formed the elastic film. A microscopic scale equipment to measure the elastic strength of the film was developed. Diagrams of electrical stress - drop deformation were obtained experimentally for the four-liquid systems of aqueous solution drops in liquid paraffin. The experimental values were somewhat higher than the theoretical ones, but their measurement method and procedure were performed successfully.4. Fluid analysis in and around single drops translating in a uniform electric field at an intermediate Reynolds number were carried out using the Galerkin method. The effects of Reynolds number, viscosity ratio between drop and continuous phases, electric field on the flow pattern in and around the drops were investigated. Consequently, the place on the surface of the drop where coalescence between the drops and drop-breakup were promoted by the imposed electric field was estimated.

1.设计了一个小型双电极箱式实验装置，利用摄像机对油相中单个水滴在外电场作用下的变形和破碎过程进行了实验研究。液滴变形程度的实验值与理论值吻合较好。并利用液滴破碎实验数据，提出了一种新的液滴破碎判据无量纲图。设计了一种新型的大型垂直双极板液-液接触器。实验研究了分散液滴在脉冲电场中的布居行为。澄清了在通过施加的脉冲场下落的液滴上实现了液滴相的分散/连续相的混合/液滴相的聚结-沉降的电流体动力学循环.原油中的溶解物质吸附在油滴表面形成弹性膜。研制了一种测量薄膜弹性强度的显微尺度装置。实验得到了水溶液滴在液体石蜡中的四液体系的电应力降变形图。实验值比理论值偏高，但测量方法和步骤都是成功的.采用Galerkin方法对中等雷诺数下均匀电场中单个液滴内和周围的流体进行了分析。研究了雷诺数、液滴与连续相的粘度比、外加电场等因素对液滴内部及周围流型的影响。因此，在液滴的表面上的地方，在那里的液滴之间的聚结和液滴破碎被施加的电场促进估计。