Local Nusselt number enhancements in liquid–liquid Taylor flows

Eain, Marc Mac Giolla; Egan, Vanessa; Punch, Jeff

doi:10.1016/j.ijheatmasstransfer.2014.09.009

Cited by 35 publications

(13 citation statements)

References 43 publications

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“…Many experiments have been performed to measure the heat transfer enhancement in microchannels with droplets, slugs, or plugs [9]. Some experiments used cylindrical microtubes [10,11,12,13], while others used rectangular microchannels [14,15,16,17]. Their experimental results showed significant enhancement of heat transfer when comparing with single phase flow, and the Nusselt numbers are several times higher than the single phase counterpart.…”

Section: Introductionmentioning

confidence: 99%

Three dimensional features of convective heat transfer in droplet-based microchannel heat sinks

Che

Wong

Nguyen

et al. 2015

International Journal of Heat and Mass Transfer

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Convective heat transfer in droplet-based microchannel heat sinks can be enhanced by the recirculating vortices due to the presence of interfaces. In rectangular microchannels, the three dimensional structures of the vortices and the 'gutters' (i.e., the space between the curved droplet interface and the corner of the microchannel) can significantly affect the heat transfer process. Numerical simulations of the heat transfer process are performed to study the three dimensional features in droplet-based microchannel heat sinks. The finite volume method and the level set method are employed to simulate the flow dynamics, the evolution of the interface, and the heat transfer. The results show that the 'gutters' can hinder the heat transfer process because of its parallel flow, whereas the recirculating flow in droplets and in slug regions between successive droplets can enhance the heat transfer by advecting hot fluid towards the center of the droplets/slugs and advecting fresh fluid towards the wall of the channel. The effects of the length of droplets, the aspect ratio of the channel cross sections, and the Peclet number are analyzed.

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Section: Introductionmentioning

confidence: 99%

Three dimensional features of convective heat transfer in droplet-based microchannel heat sinks

Che

Wong

Nguyen

et al. 2015

International Journal of Heat and Mass Transfer

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“…This gives confidence in enhancing heat transfer utilising two-phase liquid-liquid plug flow. It must be noted that studies by Liu et al [14] and Che et al [10] report that shorter plug lengths lead to higher heat transfer, which is in disagreement to Eain et al [11].…”

Section: Two-phase Heat Transfermentioning

confidence: 79%

“…The fundamental concepts from these studies should be applicable to the research study with the exception of using ferrofluid plugs instead of DIW. Eain et al [11] conducted experimental investigations examining potential heat transfer enhancements of a two-phase liquid-liquid Taylor flow regime. They studied the effects of slug length and carrier phase variations of Pd5, Dodecane and AR20 silicone oils on the local Nu.…”

Section: Two-phase Heat Transfermentioning

confidence: 99%

“…The third upgrade is to adopt two-phase flow. Two-phase flow has been shown to significantly enhance heat transfer rates relative to single-phase flow by up to 500% [9][10][11][12]. Furthermore, because liquids have higher thermal conductivity than gases, two-phase liquid-liquid flow has the potential to enhance heat transfer more effectively than two-phase gas-liquid flow [12].…”

Section: Introductionmentioning

confidence: 99%

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Ferrofluidic plug flow heat transfer enhancement

Gui¹,

Stanley²,

Nguyen³

et al. 2017

Int. J. CMEM

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Overheating of power electronic devices has become a significant issue due to their continued miniaturization and increased heat flux that needs to be dissipated. Microchannel heat sinks utilising two-phase flow are capable of very high heat transfer rates and represent a possible means of cooling such devices. In this paper, we focus on two-phase liquid-liquid plug flow using water-based ferrofluid (magnetic nanofluid) plugs as the dispersed phase and silicone oil as the continuous phase. An external magnetic field was applied to generate enhanced mixing of the microfluidic flow. We show that material properties of the ferrofluid plug influence heat transfer properties of the microfluidic flow, and demonstrate that cooling performance is further enhanced by the application of an external magnetic field, which induces mixing. We also show that microchannel heat transfer using a ferrofluid is superior to that using de-ionized water as the dispersed phase for two-phase liquid-liquid plug flow.

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“…Though plenty of studies in single phase systems in microchannels have been reported [4], a few experimental studies for two phase liquid-liquid systems have been carried out by researchers [98][99][100]. Systems used were water-light mineral [98]; siliconoilwater [99] and Water-hexadecane [100]. All the authors have observed slug flow in their investigations.…”

Section: Experimental Studies Of Heat Transfer In Microchannels Involving Liquid-liquid Two Phase Flowmentioning

confidence: 99%

Hydrodynamics of Liquid-Liquid Flows in Micro Channels and Its Influence on Transport Properties: A Review

Ganguli

Pandit

2021

Energies

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Hydrodynamics plays a major role in transport of heat and mass transfer in microchannels. This includes flow patterns and flow regimes in which the micro-channels are operated. The flow patterns have a major impact the transport properties. Another important aspect is the pressure drop in micro-channels. In the present review, the experimental and Computational Fluid Dynamics (CFD) studies covering all the above aspects have been covered. The effect of geometrical parameters like shape of channel, channel size, material of construction of channels; operating parameters like flow velocity, flow ratio and fluid properties have been presented and analyzed. Experimental and analytical work of different pressure drop models has also been presented. All the literature related to influence of flow patterns on transport properties like volumetric mass transfer coefficients (VMTC) and heat transfer coefficients (HTC) have been presented and analyzed. It is found that most works in Liquid-Liquid Extraction (LLE) systems have been carried out in slug flow and T-junctions. Models for coupled systems of flow and mass transfer have been presented and works carried out for different coupled systems have been listed. CFD simulations match experimental results within 20% deviations in quantitative and qualitative predictions of flow phenomena for most research articles referred in this review. There is a disparity in prediction of a generalized regime map and a generalized regime map for prediction of flow patterns for various systems would need the help of Artificial Intelligence.

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Local Nusselt number enhancements in liquid–liquid Taylor flows

Cited by 35 publications

References 43 publications

Three dimensional features of convective heat transfer in droplet-based microchannel heat sinks

Three dimensional features of convective heat transfer in droplet-based microchannel heat sinks

Ferrofluidic plug flow heat transfer enhancement

Hydrodynamics of Liquid-Liquid Flows in Micro Channels and Its Influence on Transport Properties: A Review

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