Two-Phase Flow Through Square and Circular Microchannels—Effects of Channel Geometry

Chung, Peter M.-Y.; Kawaji, Masahiro; Kawahara, Akimaro; Shibata, Yuichi

doi:10.1115/1.1777227

Cited by 124 publications

(30 citation statements)

References 20 publications

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“…My previous studies confirmed that the mini-fluidic extraction of Omega 3 PUFA from fish oil shows a significant yield of bioactive compounds such as EPA and DHA (Kirubanandan, 2015). Moreover, the flow dynamics and pattern at mini/micro scale is unique from the conventional channels (Chung et al, 2004). In mini/micro scale systems, the surface forces increase until gravitational forces no longer have a significant impact on the hydrodynamics of the system.…”

Section: Discussionmentioning

confidence: 53%

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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Section: Discussionmentioning

confidence: 53%

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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“…Chung et al 38 found that their data for water-nitrogen flow in a 100-lm circular channel and a 96-lm square channel are fitted well by the relation…”

Section: à4mentioning

confidence: 94%

“…9 of Chung et al 38 The arrows indicate an increase of Ca in the simulations while the two lines enclosing the shaded area correspond to the fitting of the numerical data in Figure 8 by Eqs. 7 and 8, respectively.…”

Section: à4mentioning

confidence: 99%

Viscous co‐current downward Taylor flow in a square mini‐channel

Keskin

Wörner²,

Soyhan

et al. 2009

AIChE Journal

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This article presents a computational study of the co-current downward Taylor flow of gas bubbles in a viscous liquid within a square channel of 1 mm hydraulic diameter. The three-dimensional numerical simulations are performed with an in-house computer code, which is based on the volume-of-fluid method with interface reconstruction. The computed (always axi-symmetric) bubble shapes are validated by experimental flow visualizations for varying capillary number. The evaluation of the numerical results for a series of simulations reveals the dependence of the bubble diameter and the interfacial area per unit volume on the capillary number. Correlations between bubble velocity and total superficial velocity are also provided. The present results are useful to estimate the values of the bubble diameter, the liquid film thickness and the interfacial area per unit volume from given values of the gas and liquid superficial velocities.

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“…Indeed, the flow in circular and non-circular channels may be very different due to the presence of sharp corners [17]. At contrast, Triplett et al [5] demonstrated that the flow pattern transition lines are very similar in circular and semi-triangular channels.…”

Section: Effect Of Reactor Geometrymentioning

confidence: 97%