Gas–liquid two-phase flow in microchannels

Triplett, K.A.; Ghiaasiaan, S. Mostafa; Abdel‐Khalik, S. I.; LeMouel, A.; McCord, B.N.

doi:10.1016/s0301-9322(98)00055-x

Cited by 313 publications

(44 citation statements)

References 16 publications

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“…7. The two-phase frictional pressure drop data obtained in this simulation is found to increase with increasing fluid velocities similar in many other studies 6,5,47 . The simulated data are also compared with the data obtained with the available correlation of Lockhart and Martinelli 50 Table 5.…”

Section: Evaluation Of Existing Correlations Of Two-phase Frictional supporting

confidence: 88%

“…ic systems is required in order to broaden the existing knowledge and expertise on these systems. In the literature, numerous experimental investigations are reported on the hydrodynamics and flow characteristics of gas liquid two-phase flow in microfluidic systems over the years [4][5][6][7][8][9][10][11][12][13] . Several flow patterns such as bubbly, slug/Taylor, churn, annular and dispersed have been observed in the gas liquid two-phase flow.…”

mentioning

confidence: 99%

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Numerical Study on Bubble Dynamics and Two-Phase Frictional Pressure Drop of Slug Flow Regime in Adiabatic T-junction Square Microchannel

Kishor

Chandra

Khan

et al. 2017

Chem.Biochem.Eng.Q.

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In this study, bubble dynamics and frictional pressure drop associated with gas liquid two-phase slug flow regime in adiabatic T-junction square microchannel has been investigated using CFD. A comprehensive study on the mechanism of bubble formation via squeezing and shearing regime is performed. The randomness and recirculation profiles observed in the squeezing regime are significantly higher as compared to the shearing regime during formation of the slug. Further, effects of increasing gas velocity on bubble length are obtained at fixed liquid velocities and simulated data displayed good agreement with available correlations in literature. The frictional pressure drop for slug flow regime from simulations are also obtained and evaluated against existing separated flow models. A regression correlation has also been developed by modifying C-parameter using separated flow model, which improves the prediction of two-phase frictional pressure drop data within slug flow region, with mean absolute error of 10 %. The influences of fluid properties such as liquid viscosity and surface tension on the two-phase frictional pressure drop are also investigated and compared with developed correlation. The higher liquid viscosity and lower surface tension value resulted in bubble formation via shearing regime.

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Section: Evaluation Of Existing Correlations Of Two-phase Frictional supporting

confidence: 88%

mentioning

confidence: 99%

Numerical Study on Bubble Dynamics and Two-Phase Frictional Pressure Drop of Slug Flow Regime in Adiabatic T-junction Square Microchannel

Kishor

Chandra

Khan

et al. 2017

Chem.Biochem.Eng.Q.

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“…According to Triplett et al [65], who measured airwater pressure drop inside horizontal minichannels, the homogeneous flow model provided the best prediction of the experimental void fractions in bubbly and slug flow pattern but overpredicted them in annular flow. Therefore, Chisholm's void fraction correlation that Dalkilic et al [59] recommend is used to calculate the accelerational pressure drop in the present study.…”

Section: Void Fractionmentioning

confidence: 99%

Condensation pressure drop of R22, R134a and R410A in a single circular microtube

Son

2012

Heat Mass Transfer

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The condensation pressure drop characteristics for pure refrigerants R22, R134a, and a binary refrigerant mixture R410A without lubricating oil in a single circular microtube were investigated experimentally. The test section consists of 1,220 mm length with horizontal copper tube of 3.38 mm outer diameter and 1.77 mm inner diameter. The experiments were conducted at refrigerant mass flux of 450-1,050 kg/m 2 s, and saturation temperature of 40°C. The main experimental results showed that the condensation pressure drop of R134a is higher than that of R22 and R410A for the same mass flux. The experimental data were compared against 14 two-phase pressure drop correlations. A new pressure drop model that is based on a superposition model for refrigerants condensing in the single circular tube is presented.

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“…Gas-liquid dispersions in microfluidic structures could, however, also be stabilized by integrating the mixing and reaction channels in one microdevice, thus making chemical additives unnecessary. The characteristics of such two-phase gas-liquid flows, that is, void fractions, pressure drops and flow regimes (patterns) ranging from dispersed bubbly to churn, stratified, slug (elongated bubbles) and annular flow patterns (where channel walls are wetted by a thin liquid film surrounding a gas core), have been extensively studied and reported [27][28][29][30][31][32][33][34][35][36] for miniaturized channels of internal diameter up to 1.5 mm, and which depend on the relative in-feed rates of the gas and the liquid. The flow regimes have been found to change from microbubble columns to slugs and then to subsequent annular flow patterns (Fig.…”

Section: Gas-liquid Systemsmentioning

confidence: 99%

On-microchip multiphase chemistry—a review of microreactor design principles and reagent contacting modes

et al. 2005

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Gas–liquid two-phase flow in microchannels

Cited by 313 publications

References 16 publications

Numerical Study on Bubble Dynamics and Two-Phase Frictional Pressure Drop of Slug Flow Regime in Adiabatic T-junction Square Microchannel

Numerical Study on Bubble Dynamics and Two-Phase Frictional Pressure Drop of Slug Flow Regime in Adiabatic T-junction Square Microchannel

Condensation pressure drop of R22, R134a and R410A in a single circular microtube

On-microchip multiphase chemistry—a review of microreactor design principles and reagent contacting modes

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