Mixing Characteristics of a Liquid–Liquid Dispersion in a Jet-Driven Mixing Column: Developed for the Separation of Organic Pollutants

Abstract

The present work focuses on studying the degree of liquid–liquid axial dispersion in a jet-driven mixing column. The online conductivity measurement was performed to study the residence time distribution. The effects of the jet velocity and dispersed phase volume on mixing characteristics were studied. The axial dispersion coefficient range was found to be 25.6 to 106 cm2/s. A general correlation is developed to predict the axial dispersion coefficient based on various operating variables. A mechanistic model is proposed to interpret dispersion due to the turbulence and phase circulation inside the jet-driven mixing column. Based on the velocity distribution model, the velocity characteristic factor and the dispersion factor of drop motion were also enunciated. The present study may be helpful for further understanding a two-phase system in industrial applications, especially in liquid–liquid extraction.

Prediction of intensity of dispersion in surfactant solutions in vertical sparged bubble column

“…The enhancement of velocity distribution parameter with turbulence is also reported. 22,24,25 There is no general trend in literature for velocity distribution parameter. It may be due to the fact that the distribution of velocity is complex in different bubble column and other parameters like column diameter, phase velocity, types of gas distributor, range of gas liquid and gas flow influence the value of velocity distribution parameter.…”

“…The dispersion coefficient of bubble motion is governed by various operating and geometric variables. 23,25 The effect of superficial gas velocity on dispersion coefficient due to bubble motion is shown in Figure 12. It is seen that the dispersion due to bubble motion increases with increase in superficial velocity.…”

“…23 Prakesh et al 24 applied velocity distribution approach to predict the intensity of dispersion by the degree of phase exchange in three phase system. Sangtam et al 25 implemented velocity distribution model to interpret dispersion due to the phase circulation inside the jet-driven mixing column. Recently Mondal and Majumder 26 analysed mixing characteristics by applying velocity distribution model in two-phase flows in miniaturised multichannel device.…”