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Interfacial Area in Liquid-Liquid Agitation Systems

1963; Volume: 27; Issue: 8 Linguagem: Inglês

10.1252/kakoronbunshu1953.27.576

0375-9253

Iwao Yamaguchi, Seizo Yabuta, Shinji Nagata,

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The interfacial area and the size distribution of the dispersed droplets in liquid-liquid agitation systems are directly measured by photographs with a series of geometrically similar Rushton type standard turbine agitators.Physical properties of the liquids are varied as widely as possible. The effects of the various factors on, interfacial area are investigated and the observed data are correlated by a dimensionless equation.As the interfacial tension decreases, the interfacial area itself increases, while the effect of increases in. agitator speed decreases with the breaking up of the dispersed phase. This is due to the facts that a limitation in drop size appears during ordinary agitation performance and that the size distribution curves transform from Normal to Log-normal ones as the agitator speed increases. So in a system of low interfacial tension the diameter of the greater part of the droplets approaches the minimum limit.The authors introduced a factor which shows the amount of decrease in interfacial area caused by the effect of limitation of the droplet size on the increase in agitator speed. The use of baffle plates for heavy liquid dispersion increases the interfacial area by several times and the baffles become more effective as the difference in densities between the dispersed and the continuous phase increases.