Pressure Drop and Film Thickness of Liquid-Liquid Taylor Flow in Square Microchannels

Abdollahi, Ayoub; Norris, Stuart; Sharma, Rajnish N.

doi:10.1016/j.ijheatmasstransfer.2020.119802

Cited by 23 publications

(23 citation statements)

References 49 publications

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“…Comparisons of pressure drop between models and measured data. (a) Equation () (Abdollahi et al 45 ); (b) Equation () (Yue et al 51 )…”

Section: Resultsmentioning

confidence: 99%

“…Pressure drop is an essential parameter regarding the energy consumption, design and optimization of equipment in practical applications, and it plays a major role in gas–liquid two‐phase flow and mass/heat transfer. Under Taylor flow, the gas–liquid two‐phase flow pressure drop Δ P in the microchannel could be obtained based on the unit cell model, which could be regarded as the sum of three components 36,45 :

normalΔ P goodbreak= n normalΔ P_{UC} goodbreak= n ((), normalΔ P_{S} goodbreak+ normalΔ P_{B} goodbreak+ normalΔ P_{I})

where n is the number of unit cells (unit cell consists of the liquid slug and the bubble regions, see Figure 8), Δ P UC is the pressure drop of a unit cell. Three components of Δ P UC are: (a) the frictional pressure drop between the liquid slug and the channel wall, Δ P S ; (b) the pressure drop of bubble body, namely, the part of the bubbles between the end‐caps, Δ P B ; (c) Laplace pressure drop of end‐caps of the bubbles, Δ P I .…”

Section: Resultsmentioning

confidence: 99%

“…The pressure drop terms Δ P S and Δ P B are usually estimated Hagen–Poiseuille equation for fully developed laminar flow, while Δ P I is attributed to the viscous losses in the transition area between the end caps of the bubbles and the liquid film, which could be obtained by Laplace equation 49 . Abdollahi et al 45 investigated experimentally the fluid flow and pressure drop of Taylor flow in square microchannels and implemented a three‐dimensional numerical simulation, they proposed a predicting correlation of pressure drop:

normalΔ P goodbreak= \frac{l_{normalC}}{l_{UC}} ((), C_{g} \frac{μ_{L} U_{TP} l_{S}}{A_{normalC}} goodbreak+ C_{g} \frac{μ_{L} U_{TP} l_{film}}{A_{C} ((), 1 goodbreak+ {(\frac{A_{normalG}}{A_{normalC}})}^{2} ((), \frac{1}{μ_{normalG}} goodbreak- 1))} goodbreak+ \frac{C_{1} σ {(3 Ca)}^{2 / 3}}{d_{normalh}})

where C 1 is the curvature parameter. Wong et al 50 found C 1 = 3.553 for the square channel.…”

Section: Resultsmentioning

confidence: 99%

“…It could be clearly seen that the free volumes of Pressure drop is an essential parameter regarding the energy consumption, design and optimization of equipment in practical applications, and it plays a major role in gas-liquid two-phase flow and mass/ heat transfer. Under Taylor flow, the gas-liquid two-phase flow pressure drop ΔP in the microchannel could be obtained based on the unit cell model, which could be regarded as the sum of three components 36,45 :…”

Section: Effect Of Ils Concentration On Co 2 Absorption Ratementioning

confidence: 99%

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Performance and pressure drop ofCO₂absorption into task‐specific and halide‐free ionic liquids in a microchannel

Zhu

et al. 2022

AIChE Journal

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The gas–liquid two‐phase flow pattern, absorption rate and pressure drop of CO2 absorbed into the aqueous solution of the task‐specific ionic liquids (1‐aminopropyl‐3‐methylimidazole tetrafluoroborate [Apmim][BF4] and 1‐hydroxyethyl‐3‐methylimidazole tetrafluoroborate [OHemim][BF4]) and halide‐free ionic liquid 1‐butyl‐3‐methylimidazolium methylsulfate [Bmim][CH3SO4] were investigated in a microreactor. The absorption mechanism of the three ionic liquids was analyzed employing the 13C NMR spectroscopy. The [Apmim][BF4] was found to have the best ability of CO2 capture compared with the other two ionic liquids, as chemical absorption occurred between [Apmim][BF4] and CO2, while only physical absorption took place between [OHemim][BF4]/[Bmim][CH3SO4] and CO2. The sequence of CO2 absorption rate in three ionic liquids aqueous solutions is: [Apmim][BF4] > [Bmim][CH3SO4] > [OHemim][BF4]. Furthermore, the effects of gas–liquid flow rate and ionic liquids concentration on CO2 absorption rate and pressure drop were studied, the pressure drop models based on various flow patterns were proposed.

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“…Comparisons of pressure drop between models and measured data. (a) Equation () (Abdollahi et al 45 ); (b) Equation () (Yue et al 51 )…”

Section: Resultsmentioning

confidence: 99%

normalΔ P goodbreak= n normalΔ P_{UC} goodbreak= n ((), normalΔ P_{S} goodbreak+ normalΔ P_{B} goodbreak+ normalΔ P_{I})

Section: Resultsmentioning

confidence: 99%

normalΔ P goodbreak= \frac{l_{normalC}}{l_{UC}} ((), C_{g} \frac{μ_{L} U_{TP} l_{S}}{A_{normalC}} goodbreak+ C_{g} \frac{μ_{L} U_{TP} l_{film}}{A_{C} ((), 1 goodbreak+ {(\frac{A_{normalG}}{A_{normalC}})}^{2} ((), \frac{1}{μ_{normalG}} goodbreak- 1))} goodbreak+ \frac{C_{1} σ {(3 Ca)}^{2 / 3}}{d_{normalh}})

where C 1 is the curvature parameter. Wong et al 50 found C 1 = 3.553 for the square channel.…”

Section: Resultsmentioning

confidence: 99%

Section: Effect Of Ils Concentration On Co 2 Absorption Ratementioning

confidence: 99%

See 2 more Smart Citations

Performance and pressure drop ofCO₂absorption into task‐specific and halide‐free ionic liquids in a microchannel

Zhu

et al. 2022

AIChE Journal

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“…They also developed correlations to predict the friction factor and heat transfer rate of liquid–liquid Taylor flow. The other work of Abdollahi et al [ 18 ] developed correlations to predict the pressure drop and film thickness in square microchannels.…”

Section: Introductionmentioning

confidence: 99%

Effect of thermal boundary conditions on heat transfer performance of liquid–liquid Taylor flow through a microchannel with obstruction

2021

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Two‐phase Taylor flow through microchannels has attracted the attention of many researchers because of its enhanced heat transfer characteristics. The heat transfer rate of two‐phase flow is higher than the basic primary fluid flow through the same microchannel. This higher heat transfer rate is further improved by droplet manipulation techniques along with various thermal boundary conditions, which is the aim of the present work. In this novel work, the numerical investigation was carried out on liquid–liquid Taylor flow and heat transfer characteristics through a 2D rectangular microchannel with an obstruction in the path. The effect of capillary number, size, and position of the obstruction on heat transfer behaviour of Taylor flow was also analyzed. The height and length of the microchannel were taken as 100 and 3000 μm, respectively. Water and mineral oil were taken as working fluids. Results show that the Nusselt number of Taylor flow with obstruction increases by 76% compared to single‐phase flow and significantly increases over the Taylor flow without obstruction. Further, the study explored the effect of modulated wall temperature on Taylor flow heat transfer for optimum parameters of capillary number, size, and position of the obstruction and an improvement of 290% was achieved in heat transfer compared to that of single‐phase flows.

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Droplet generation at T-junctions in parallelized microchannels

et al. 2023

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Pressure Drop and Film Thickness of Liquid-Liquid Taylor Flow in Square Microchannels

Cited by 23 publications

References 49 publications

Performance and pressure drop ofCO₂absorption into task‐specific and halide‐free ionic liquids in a microchannel

Performance and pressure drop ofCO₂absorption into task‐specific and halide‐free ionic liquids in a microchannel

Effect of thermal boundary conditions on heat transfer performance of liquid–liquid Taylor flow through a microchannel with obstruction

Droplet generation at T-junctions in parallelized microchannels

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Pressure Drop and Film Thickness of Liquid-Liquid Taylor Flow in Square Microchannels

Cited by 23 publications

References 49 publications

Performance and pressure drop ofCO2absorption into task‐specific and halide‐free ionic liquids in a microchannel

Performance and pressure drop ofCO2absorption into task‐specific and halide‐free ionic liquids in a microchannel

Effect of thermal boundary conditions on heat transfer performance of liquid–liquid Taylor flow through a microchannel with obstruction

Droplet generation at T-junctions in parallelized microchannels

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Product

Resources

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Performance and pressure drop ofCO₂absorption into task‐specific and halide‐free ionic liquids in a microchannel

Performance and pressure drop ofCO₂absorption into task‐specific and halide‐free ionic liquids in a microchannel