Studies on Multiphase Agitation

The present study deals with the determination of minimum impeller speed for complete liquid-liquid-gas (three-phase) dispersion, N_cdg, in a mechanically agitated baffled vessel of 0.2038 m i.d. using a turbine impeller. Mineral oil (diesel and kerosene) and water were used as the dispersed and continuous phases respectively. Compressed air was used as the gas phase through a ring sparger. N_cdg was determined visually and also by the sampling method. The results of this work show an excellent agreement between the values of N_cdg SO obtained and those obtained using the visual method. A correlation has been proposed for three-phase (liquid-liquid-gas) system for dif'ferent volume fractions of the dispersed phase.