Liquid‐liquid two‐phase flow patterns in a rectangular microchannel

Zhao, Yuchao; Chen, Guangwen; Yuan, Quan

doi:10.1002/aic.11029

Cited by 287 publications

(242 citation statements)

References 32 publications

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“…These results were validated with the experimental results of Tice et al 22 Yong et al 25 numerically studied the immiscible kerosene-water two-phase flows in a T-junction microchannel using a Lattice Boltzmann (LB) method. This result quantitatively and qualitatively verified the experimental results of Zhao et al [14][15][16] and justified the effectiveness of the numerical method. Further, the effect of interfacial tension and contact angle on the flow patterns and droplet shapes were investigated, and highlighted the numerical results based on the improved two-phase LB model.…”

Section: Introductionsupporting

confidence: 80%

“…The flow pattern and droplets formation mechanism of dispersed phase have been experimentally studied by several authors, who have discussed the flow regimes in microchannels viz. mono-dispersed drop flow, slug flow, parallel flow based on the Weber numbers of fluid phases [14][15][16][17] . The free surface simulation has been carried out by Kashid et al 18 to understand the mechanism of slug flow generation.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigations of Two-phase Flows through Enhanced Microchannels

Chandra¹,

Kishor²,

Mishra

et al. 2016

Chem.Biochem.Eng.Q.

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Microfluidic devices are quite important for process industries, as these devices can intensify heat and mass transfer in two-phase reaction systems. Two-phase reaction systems, such as gas-liquid and liquid-liquid reactions with certain limitations have already been carried out in microfluidic systems by a few authors. However, these concepts are still under development and a detailed understanding of the hydrodynamics involve is required. Hydrodynamics studies are inherently crucial to provide precise reaction conditions and identify asymptotic performance limits. In the present work, Computational Fluid Dynamics (CFD) simulation was carried out to investigate the hydrodynamics involved in the T-junction enhanced microchannel. The slug formation, slug size, slug shape, and pressure drop in the enhanced microchannel were predicted using the volume of fluid (VOF) for water-cyclohexane system. The effects of obstruction spacing on pressure drop, slug lengths, and mixing within the slug were also examined. This study revealed that mixing enhances tremendously within the slug and at the interface in the enhanced microchannel, but with slightly greater pressure drop. However, an increase in obstruction spacing affects the slug formation, unit slug length, and pressure drop.

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Section: Introductionsupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Numerical Investigations of Two-phase Flows through Enhanced Microchannels

Chandra¹,

Kishor²,

Mishra

et al. 2016

Chem.Biochem.Eng.Q.

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“…Therefore, the interfacial tension dominates the inertia forces producing slugs. Zhao et al (2006) showed that if inertia forces dominate (We > 10), the turbulence appears and chaotic or annular flow are observed.…”

Section: Analysis Of the Flow Patterns Based On Capillary And Reynoldmentioning

confidence: 99%

“…The effects of the linear velocity, the channel diameter and the ratio of the volumetric flow rates on the stability of the slug flow regime were represented in a flow pattern map. Zhao et al (2006) investigated the stability of different flow patterns using a T-junction rectangular microreactor made of PMMA with deionised water and kerosene. In the flow pattern map, the phase Weber numbers (Table 1) were used.…”

Section: Introductionmentioning

confidence: 99%

Liquid–liquid two-phase flow patterns and mass transfer characteristics in rectangular glass microreactors

Dessimoz

Cavin

Renken

et al. 2008

Chemical Engineering Science

363

255

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The flow of two immiscible fluids was investigated in rectangular glass microchannels with equivalent diameters of 269 and 400 m. Deionised water, dyed toluene and hexane were selected as probe fluids. Flow patterns were obtained for Y-and T-junction of two micro-channels and monitored by a photo-camera. Volumetric velocities of water and organic phase varied between 1 and 6 ml/h. The formation mechanism of slug and parallel flow was studied and the mass transfer performances of two flow patterns were compared. The shape of the interface between the immiscible liquids was controlled by a competition between the viscous forces and the local interfacial tension. The flow patterns could be correlated with the mean Capillary and Reynolds numbers. The mass transfer coefficients for parallel and slug flow were determined using instantaneous neutralisation (acid-base) reaction. The two flow patterns showed the same global volumetric mass transfer coefficients in the range of 0. 2-0. 5 s −1 , being affected mainly by the base concentration in water for parallel flow and by the linear velocity in the case of the slug flow.

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“…For all the experiments reported, the mean Weber numbers are smaller than 1. Therefore, the interfacial tension dominates the inertia forces producing slugs (Zhao et al, 2006). It showed that if inertia forces dominate (We >10), the turbulence appears and annular flows are observed.…”

Section: Discussionmentioning

confidence: 96%

Flow Dynamic Behavior of Fish Oil/Silver Nitrate Solution in Mini-Channel, Effect of Alkane Addition on Flow Pattern and Interfacial Tension

Shanmugam¹

2016

American Journal of Engineering and Applied Sciences

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Abstract:The mini-fluidic contacting system is developed as process intensification platform as an attractive alternative for existing liquidliquid extraction system for separation of Omega 3 PUFA from using Aqueous 50% Wt. Silver nitrate solution. To improve the performance of extraction in mini-fluidics, it is necessary to study the flow-dynamic behavior of fish oil silver nitrate system in the channel. Moreover, different flow patterns influence mass transfer and mixing which indirectly influence the separation efficiency of omega 3 PUFA from fish oil. Therefore, Different flow patterns were studied at Y-junction that connected to mini-channel and classified over a range of organic phase and aqueous flow rate. The flow is stratified at the "Y" Junction after phase inversion and also due to the reduction of interfacial tension between fish oil and silver nitrate solution. The addition of alkane's solvents into the fish oil ethyl ester is attempted to change the flow pattern of fish oil silver nitrate system by elevation of interfacial tension. The formation mechanism of slug and stratified flow was studied by a competition between the gravity, inertia, viscous forces and the interfacial tension forces. The flow patterns maps is presented in terms of Ca, Re and We and identified the three regions namely gravity force dominant region, transition region and interfacial force dominant region. The flow patterns observed in real Fish Oil/AgNO 3 system was significantly different than previously reported for a synthetic DHA/AgNO 3 system. The addition of organic solvent into the fish oil ethyl ester increase the interfacial tension between fish oil and silver nitrate system, however, the increase was not sufficient to produce slug flow. This would suggest that practical processing of fish oils with AgNO 3 would require the handling of stratified flow within the processing units.

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Liquid‐liquid two‐phase flow patterns in a rectangular microchannel

Cited by 287 publications

References 32 publications

Numerical Investigations of Two-phase Flows through Enhanced Microchannels

Numerical Investigations of Two-phase Flows through Enhanced Microchannels

Liquid–liquid two-phase flow patterns and mass transfer characteristics in rectangular glass microreactors

Flow Dynamic Behavior of Fish Oil/Silver Nitrate Solution in Mini-Channel, Effect of Alkane Addition on Flow Pattern and Interfacial Tension

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