Fluid flow and heat transfer of liquid-liquid two phase flow in microchannels: A review

Abdollahi, Ayoub; Sharma, Rajnish N.; Vatani, Ashkan

doi:10.1016/j.icheatmasstransfer.2017.03.010

Cited by 53 publications

(28 citation statements)

References 35 publications

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“…Mass transfer can occur both at the front and end caps of the slugs and in the film layer between the droplet and the capillary wall, depending on the capillary material and the wetting properties of the fluids [7]. Taylor flow and its applications are described in-depth in the literature, e.g.. see [8][9][10][11][12][13][14]. However, the interplay between mass transfer and intrinsic reaction kinetics in the context of the flow pattern has to be investigated.…”

Section: Introductionmentioning

confidence: 99%

Lab‐Scale Microreactor Plant for the Study of Methylations with Liquid Chloromethane

2020

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Chloromethane is an important reagent for methylations in the process industry. However, as a gas suspected of causing cancer, it is rarely used at laboratory scale. Therefore, a setup is presented here for studies in a laboratory under safe and reproducible conditions. The use of a microreactor guarantees high heat transfer rates and a low holdup of the reagent. As a proof‐of‐concept, the reaction of chloromethane with the secondary amine morpholine in aqueous solution is investigated. By applying elevated pressures, a liquid‐liquid system with enhanced solubility of chloromethane in the aqueous phase is accessible.

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Section: Introductionmentioning

confidence: 99%

Lab‐Scale Microreactor Plant for the Study of Methylations with Liquid Chloromethane

2020

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“…In the recent decades, micro-scale convection garners the attention of research community due to the formidable thermal management problem in the miniaturization of electronic devices. Microchannel heat sink appears to be a favorable solution owing to its large area-to-volume ratio which induces high heat transfer rate [12]. This ratio can be intensified through the embedment of porous medium [13] and hence enhances the heat removal rate to a greater extent [14].…”

Section: Introductionmentioning

confidence: 99%

“…eff is Biot number, Br' = μ eff ū 2 /q w H is Brinkman number, Re = 2Hρ nf ū/μ eff is nanofluid Reynolds number, Pr = c p,nf μ eff /k nf,eff is nanofluid Prandtl number and ξ = H / L is channel aspect ratio. The constants in Eq (12). and Eq.…”

mentioning

confidence: 99%

Heat and Flow Characteristics of Nanofluid Flow in Porous Microchannels

Ting

Hung²,

Osman

et al. 2018

Int. J. Automot. Mech. Eng.

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In the present study, convective flow of nanofluid in porous microchannel is analyzed by utilizing field synergy principle. The effects of porous medium embedment on the field synergy of water-Al 2 O 3 nanofluid is investigated based on locally thermal nonequilibrium model. Energy equations for both fluid and solid phases are solved analytical while the field synergy formulations based on viscous dissipative flow are developed. It is observed that the interstitial heat transfer affects the field synergy of the flow tremendously. The deviation between one-energy-equation model and two-energyequation model reduces when the field synergy of the system increases. With the embedment of porous medium, the convection performance of microchannel is enhanced due to the increased synergy between the heat and flow fields. Besides, the field synergy of the system can be further enhanced by suspending nanoparticle in conventional fluid. This study provides an auxiliary point of view on the distinctive convection performance of nanofluid flow in porous microchannel.

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“…Slug flow is encountered in various applications of droplet-based microfluidic systems (e.g., DNA analysis, protein crystallization [1]). It is also used for microelectronics cooling [2,3]. While gas-liquid slug flow has been studied extensively, less research work, both experimental and numerical, has been done on liquid-liquid systems [2][3][4].…”

mentioning

confidence: 99%

“…It is also used for microelectronics cooling [2,3]. While gas-liquid slug flow has been studied extensively, less research work, both experimental and numerical, has been done on liquid-liquid systems [2][3][4]. Wu et al [5] have recently performed an experimental study on liquid-liquid slug hydrodynamics in square microchannels of cross-shaped junctions.…”

mentioning

confidence: 99%

Numerical Modeling of Liquid-Liquid Slug Flow in a Cross-Shaped Square Microchannel

Filimonov¹,

Wu²,

Sundén³

2019

Proceedings of the 4th World Congress on Momentum, Heat and Mass Transfer

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Extended AbstractSlug flow (or Taylor flow) in microchannels is a two-phase flow regime characterized by the motion of gas bubbles or liquid droplets in a continuous liquid flow. Heat and mass transfer from the fluid to the wall is improved due to internal recirculating flow within both the bubbles/droplets and the continuous phase liquid slugs which promotes the radial mixing of fluids. Slug flow is encountered in various applications of droplet-based microfluidic systems (e.g., DNA analysis, protein crystallization [1]). It is also used for microelectronics cooling [2,3]. While gas-liquid slug flow has been studied extensively, less research work, both experimental and numerical, has been done on liquid-liquid systems [2][3][4]. Wu et al. [5] have recently performed an experimental study on liquid-liquid slug hydrodynamics in square microchannels of cross-shaped junctions. However, it is difficult to make accurate measurements in microstructures. Furthermore, there are several factors influencing the slug hydrodynamics, such as flow rate, fluid viscosity, interfacial tension and channel geometry. Numerical modeling has emerged as a promising alternative way of studying microscale slug flow [6,7]. Numerical simulations can be utilized to study the effect of various parameters on slug dynamics, droplet and liquid slug sizes, heat transfer etc. Furthermore, modeling can provide flow details which are difficult or impossible to obtain directly from experiments. Thus, the present study aims to use computational fluid dynamics (CFD) to simulate the hydrodynamics of flow of a liquid (organic phase) dispersed in a continuous phase (aqueous phase) in a square channel of cross-shaped junction with a hydraulic diameter of 400 µm.The Volume of fluid (VOF) method is employed to model the two-phase slug flow by tracking the liquid-liquid interface. Fluent 17.0 CFD software is used to perform the computations in the present study. Experimental results for water-butanol system are used to validate the numerical setup. Velocity field, liquid film thickness, distance between droplets, and droplet length, volume and velocity were extracted from the numerical simulations. The droplet formation process and droplet and water slug lengths were compared with the experimental ones. It was found that the three-phase contact angle (liquid-liquidsolid) affects the droplet formation frequency, hence the droplet size and the water slug length vary with the contact angle value applied. Therefore, the effect of the wall contact angle on the modeling of the droplet formation process is also investigated. The numerical setup will be also validated additionally using a different organic phase, e.g., toluene. Once the validation is done, the setup can be used to study the effects of liquid properties, channel geometry etc. on the slug hydrodynamics, and thus can help to obtain a better understanding of the related flow phenomena. In addition, as the numerical setup uses the same droplet generation mechanism as used in the experiments, it can be u...

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Fluid flow and heat transfer of liquid-liquid two phase flow in microchannels: A review

Cited by 53 publications

References 35 publications

Lab‐Scale Microreactor Plant for the Study of Methylations with Liquid Chloromethane

Lab‐Scale Microreactor Plant for the Study of Methylations with Liquid Chloromethane

Heat and Flow Characteristics of Nanofluid Flow in Porous Microchannels

Numerical Modeling of Liquid-Liquid Slug Flow in a Cross-Shaped Square Microchannel

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