Experimental Investigations in Liquid–Liquid Dispersion System: Effects of Dispersed Phase Viscosity and Impeller Speed

Abidin, Mohd Izzudin Izzat Zainal; Raman, Abdul Aziz Abdul; Nor, Mohamad Iskandr Mohamad

doi:10.1021/ie5002845

Cited by 20 publications

(14 citation statements)

References 39 publications

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“…They also observed that the distributions broaden as the viscosity increases. De Hert and Rodgers, Liu et al, and Zainal Abidin et al also observed similar phenomena in their experiments. They also found that the drop stretched into threads prior to breakup, leading to the generation of satellite droplets.…”

Section: Introductionsupporting

confidence: 65%

Influence of Dispersed-Phase Viscosity on Droplet Breakup in a Continuous Pump-Mixer

Zhou

Yang

Jing

et al. 2019

Ind. Eng. Chem. Res.

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The influence of dispersed-phase viscosity on droplet breakup in a pump-mixer was determined using a direct measurement approach, which was performed using a high-speed online camera. The experimental results show that the interfacial stress and internal viscous stress can be applied to characterize the influence of the interfacial tension and dispersed-phase viscosity on drop breakup, respectively. The daughter droplet size presents a bell-shaped distribution and is slightly dependent on the drop restoring stress. An empirical correlation of the drop breakup frequency function is established to include the influence of the dispersed-phase viscosity. Moreover, the new correlation reveals a clear physical relationship between the variables of physical properties and hydraulic parameters, which strengthens its extensibility when applied to other systems or equipment.

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Section: Introductionsupporting

confidence: 65%

Influence of Dispersed-Phase Viscosity on Droplet Breakup in a Continuous Pump-Mixer

Zhou

Yang

Jing

et al. 2019

Ind. Eng. Chem. Res.

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“…The exponent of We is consistent with the reported values, and the values of K 1 and K 2 are in the range reviewed by Zhou…”

Section: Resultssupporting

confidence: 90%

Online monitoring of drop/particle size and size distribution in liquid–liquid dispersions and suspension polymerizations by optical reflectance measurements

Xie

Pan

Bao

2016

J of Applied Polymer Sci

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Evolutions of drop/particle size and size distribution in liquid-liquid dispersions and suspension polymerizations of methyl methacrylate (MMA) were monitored by using an online optical reflectance measurement (ORM), and effects of operating parameters such as the agitation rate, concentration of poly(vinyl alcohol) (PVA) dispersant, and initial concentration of poly(methyl methacrylate) (PMMA) in MMA monomer on the Sauter mean diameter (d 32 ) and size distribution of drop/particle were investigated. According to the variations of d 32 of drops/particles with time, four characteristic particle formation stages can be identified for suspension polymerization process. The factors that lead to increase the rate of drop break up, such as increasing of concentration of PVA and decreasing of viscosity of dispersed phase, would postpone the particle growth stage. The d 32 and size distribution breadth of drops/particles were significant increased when the liquid-liquid dispersions or suspension polymerizations were conducted at low PVA concentrations or MMA/PMMA solutions with high PMMA contents were used as the dispersed phase, in consistent with the scanning electron micrograph observation on final PMMA particles. It is clear that ORM can be effectively applied in online monitoring of size and size distribution of drops/particles in the liquid-liquid dispersions and suspension polymerizations.

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“…The Sodium dodecyl sulfate (SDS) was chosen as a surfactant in this work [10]. Approximately 0.3% w/w of the surfactant was diluted in to the distilled water to prepare the surfactant solution [34]. After a short period of agitation the required amount of oil was added gently onto the top surface of the mixture of water and surfactant [10].…”

Section: Methodsmentioning

confidence: 99%

“…A dynamic equilibrium between drops is reached when there is no further change in d 32 during a breakage and coalescence in a mixing tank, indicating the final drop size distribution [34,38]. Commonly, 1 to 3 hours of agitation is required to reach a relative dynamic equilibrium based on the experimental conditions [6,14].…”

Section: Equilibrium Timementioning

confidence: 99%

Experimental and modeling evaluation of droplet size in immiscible liquid-liquid stirred vessel using various impeller designs

Ghotli

Abbasi

Bagheri

et al. 2019

Journal of the Taiwan Institute of Chemical Engineers

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The present study investigates the effects of impeller design and dispersed phase volume ratio on mean drop sizes (d 32 ) in immiscible liquid-liquid stirred vessel through experimental and modeling approaches. Various impeller designs including conventional and new impeller designs were employed to cover both radial and axial flow impellers. The microscopic method associated with image processing tools was used for the drop size analysis. The results showed the hydrofoil impeller produced the largest drop sizes while the double-curved blade turbine produced the smallest drop sizes, corresponding to about 37% difference. Increasing the dispersed phase volume ratio from 1% to 10%) increased the d 32 by approximately 20 to 40%. Adaptive neurofuzzy inference system based on fuzzy C-means (ANFIS-FCM) clustering algorithm was used to develop a model to predict drop sizes, and its validation and accuracy were examined by comparing the results to the experimental data. The results also proved the superior prediction capability of the ANFIS-FCM method over the empirical correlations for the most cases.

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Experimental Investigations in Liquid–Liquid Dispersion System: Effects of Dispersed Phase Viscosity and Impeller Speed

Cited by 20 publications

References 39 publications

Influence of Dispersed-Phase Viscosity on Droplet Breakup in a Continuous Pump-Mixer

Influence of Dispersed-Phase Viscosity on Droplet Breakup in a Continuous Pump-Mixer

Online monitoring of drop/particle size and size distribution in liquid–liquid dispersions and suspension polymerizations by optical reflectance measurements

Experimental and modeling evaluation of droplet size in immiscible liquid-liquid stirred vessel using various impeller designs

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