Measurement of drop size distribution time rate for liquid-liquid dispersion using IPI method

Radek Sulc,Vaclav Kopecky,Darina Jasikova,P Dančová,J Novosad,Bohus Kysela,Michal Kotek

doi:10.1051/epjconf/201921302032

Abstract

The liquid-liquid dispersion properties are studied mainly by image analysis (IA) and Interferometric Particle Imaging (IPI). Drop sizes will be investigated in dilute dispersion since in this case the break up phenomena is the dominating and is not affected by phase fraction. Characteristics of the size distribution and the evolution of two liquid-liquid phase’s disintegration were studied. The IPI method was used for subsequent detailed study of the disintegrated droplets. We compared two liquids: Rhodosil Oil 47V50, and Silicone Oil AP1000 under stirrer rate of 540 rpm, and 760 rpm. The experiment run in the scaled model of agitated tank with Rushton turbine.

Highlights

Mixing of liquids represents more than sixty percent of all industrial processes
Each record was evaluated for mean particle diameter (MPD) in the whole visualized area
We have presented the results in the form of graphs, based on the principle of the Interferometric Particle Imaging (IPI) method, when the particles are measured in the entire area of interest, these results can be processed graphically

Summary

Introduction

Mixing of liquids represents more than sixty percent of all industrial processes. A huge amount of mass is mixed in vessels stirred by an impeller. The global trend in process optimization involves new technologies providing higher quality products with lower energy demands. Trend is to develop more efficient mixing equipment. Modern CFD methods are dealing with prediction of drop size distributions and their dynamics. The drop breakage, coalescence rates and final droplet size distribution depend on geometry of vessel and impeller, agitation rate and physical properties of mixed phases. Kolmogorov [1] and Hinze [2] were the first, who derived a relation for the maximum drop diameter. The maximum drop size dmax is determined by external deforming forces and restoration forces. The maximum drop size dmax is determined by external deforming forces and restoration forces. [2]

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Conclusion