Experimental and computational analysis of immiscible liquid–liquid dispersions in stirred vessels

Enhancement of liquid–liquid mixing in a mixer-settler by a double rigid-flexible combination impeller

“…Liquid-liquid extraction in a mixer-settler is a typical non-linear, non-equilibrium, irreversible physical and chemical process [11][12][13]. Thus, liquid-liquid mixing in a mixersettler is a highly complex chaotic process that exhibits spatiotemporal chaos behavior [14].…”

CFD Prediction of the Critical Agitation Speed for Complete Dispersion in Liquid‐Liquid Stirred Reactors

“…Laurenzi et al [16] and Abu-Farah et al [17] used a uniform monodispersed droplet size throughout the tank. Laurenzi et al [16] discovered that the effect of the droplet size on the oil holdup distribution was significant. So far, the quantitative comparison with experimental data is not well resolved.…”

“…Wang and Mao [15] adopted the drag formulation that took into account the drop deformation, while Laurenzi et al [16] used the drag correlation that was originally developed for rigid spheres. In the present work, the three drag formulations listed in Tab.…”

“…The drop size distribution (DSD) was calculated through two-phase CFD techniques coupled with breakage and coalescence models [12][13][14]. In the numerical simulation performed by Wang and Mao [15] and Laurenzi et al [16], the Eulerian-Eulerian approach was employed to model the liquid-liquid two-phase flow in a stirred tank. Laurenzi et al [16] captured the critical impeller speed for complete dispersion by visual observation of the simulated dispersed phase holdup contour in a vertical plane midway between two baffles, and such a state was considered as achieved when the oil layer had almost completely disappeared.…”

“…In the numerical simulation performed by Wang and Mao [15] and Laurenzi et al [16], the Eulerian-Eulerian approach was employed to model the liquid-liquid two-phase flow in a stirred tank. Laurenzi et al [16] captured the critical impeller speed for complete dispersion by visual observation of the simulated dispersed phase holdup contour in a vertical plane midway between two baffles, and such a state was considered as achieved when the oil layer had almost completely disappeared. The cyclohexane/water dispersion behavior in a nonbaffled round-bottom stirred vessel was studied experimentally and with CFD simulation, using an algebraic slip mixture (ASM) model, by Abu-Farah et al [17].…”