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

1. 设计了一种小型双电极箱型装置，利用摄像机对外电作用下油相中单个水滴的变形和破碎过程进行了实验研究。液滴的实验变形程度与理论结果吻合较好。利用液滴破碎实验数据，提出了一种新的液滴破碎判据图。设计了一种新型的双极板垂直液液接触器。实验研究了分散液滴在脉冲电场中的居群行为。结果表明，在脉冲场作用下，液滴的分散/连续相的混合/聚结-沉降的电流体动力循环得到了实现。原油中的溶解性物质吸附在液滴表面，形成弹性膜。研制了薄膜弹性强度的微尺度测量装置。实验得到了液体石蜡水溶液液滴四液体系的电应力-液滴变形图。实验值略高于理论值，但其测量方法和步骤都是成功的。采用伽辽金方法对在中等雷诺数的均匀电场中单液滴内部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、电场对液滴内部和液滴周围流态的影响。因此，估计了施加电场促进液滴表面上液滴之间结合和液滴破裂的位置。

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.