Flow pattern, void fraction and pressure drop of two-phase air–water flow in a horizontal circular micro-channel

Saisorn, Sira; Wongwises, Somchai

doi:10.1016/j.expthermflusci.2007.09.005

Cited by 92 publications

(41 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In addition, the trend obtained is similar to that predicted by previous correlations Eq. (7)(8)(9)(10) of capillary number, the bubble sizes are uniform along the length of the channel; however, increasing liquid velocity induced non-uniformity in the bubble sizes in the channel. In the present study, the non-uniformity was observed near Ca~1.5·10 -3 .…”

Section: Effect Of Flow Rates On Bubble Lengthmentioning

confidence: 99%

“…These flow patterns develop in different flow conditions, fluid's nature, channel size, geometry and wettability of the microfluidic system. The flow pattern maps 4,7,8,10 indicate that slug flow usually dominates over other flow patterns for wide-ranging operating conditions in microfluidic systems. The slug flow is characterized by alternate sequences of cylindrical shaped liquid slugs and gas bubbles.…”

mentioning

confidence: 99%

“…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%

See 2 more Smart Citations

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.

View full text Add to dashboard Cite

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.

show abstract

Section: Effect Of Flow Rates On Bubble Lengthmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

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.

View full text Add to dashboard Cite

show abstract

“…El estudio experimental de este tipo de flujo contribuye de manera efectiva a la comprensión de este fenómeno (Wong y Yau, 1997;Grolman y Fortuin, 1997;Lovick y Angeli, 2004;Rodríguez y Olieman, 2006;Lu et al, 2007;Saisorn y Wongwises, 2008). Por otra parte, la adquisición de datos experimentales es necesaria para el desarrollo y/o validación de modelos y correlaciones que permitan cuantificar los parámetros necesarios para el diseño de procesos y equipos donde este tipo de flujo esté presente (Woldesemayat y Ghajar, 2007;García et al, 2003García et al, , 2005García et al, , 2007Jin et al, 2003;Zhang et al, 2003).…”

Section: Introductionunclassified

Estudio Experimental de Patrones de Flujo Bifásico Aire-Agua en Tuberías Horizontales y Ligeramente Inclinadas

García

Haoulo

2009

Inf. tecnol.

View full text Add to dashboard Cite

ResumenSe realizó un estudio experimental de patrones de flujo bifásico aire-agua en tuberías horizontales y ligeramente inclinadas. Se realizaron 493 experimentos de flujo bifásico aire-agua de los cuales 191 corresponden a tubería horizontal y 302 corresponden a flujo ascendente. Las distribuciones espaciales de los experimentos incluyen los patrones de flujo estratificado liso y ondulado, tapón, anular y burbuja dispersa. Se desarrollan mapas de patrones de flujo experimentales para cada ángulo de inclinación y se evalúa la capacidad de predicción de cuatro modelos mecanicistas y dos modelos de correlación utilizados comúnmente en la literatura para determinar patrones de flujo. Comparando con los valores experimentales se encuentra que los modelos seleccionados tienen un porcentaje de acierto mayor al 75 %. Palabras clave: flujo bifásico, tuberías horizontales, patrones de flujo, flujo aire-agua Experimental Study of Air-Water Two-Phase Flow Patterns in Horizontal and Slightly Inclined Pipelines AbstractAn experimental study in horizontal and slightly inclined pipelines was performed. A total of 493 airwater two-phase flow experiments were carried out, of which 191 correspond to horizontal pipelines and 302 correspond to upward flow. The space distributions of the experiments include the smooth and wavy stratified, slug, annular and dispersed bubble flow patterns. Experimental maps of the flow patterns for each inclination angle are developed and the prediction capability of four mechanistic models and two correlating models commonly used in the literature for determining flow patterns are evaluated. Comparison between calculated and experimental values indicates that the selected models have a success percentage greater than 75%.

show abstract

“…The pressure drop associated with a liquidgas Taylor flow regime has received significant attention in the literature and has been the subject of numerous numerical and experimental studies, (Awad and Muzychka, 2008;Kawahara et al, 2002;Saisorn and Wongwises, 2008;Triplett et al, 1999), however, the prediction of the pressure drop in liquid-liquid flows has received significantly less attention, (Gupta et al, 2013;Jovanovic et al, 2010;Tsaoulidis et al, 2013). The prediction is considerably more complicated due to the increased importance of the viscosity of the dispersed phase and depending on the viscosity ratio that exists between the phases, the resultant interfacial shear can have considerable effects on the overall pressure drop.…”

Section: Introductionmentioning

confidence: 99%

Review and extension of pressure drop models applied to Taylor flow regimes

Eain

Egan

Howard

et al. 2015

International Journal of Multiphase Flow

View full text Add to dashboard Cite

a b s t r a c tThis paper investigates the pressure drop induced by both liquid-liquid and liquid-gas segmented Taylor flow regimes. A comprehensive experimental programme was completed using four different liquidliquid and three different liquid-gas combinations over dimensionless slug length, Reynolds and Capillary numbers that spanned several orders of magnitude. Comparisons between the liquid-liquid pressure drop data and the most referenced expressions in the literature highlighted their lack of robustness and demonstrated their inapplicability for use with most practical systems that incorporate liquid-liquid Taylor flow regimes. The experimental pressure drop values obtained for the liquid-gas flows agreed well with existing pressure drop correlations. Interpretation of the liquid-liquid data using liquid-gas models unearthed the existence of a threshold viscosity ratio. Above this threshold, experimental liquid-liquid data was found to agree well with existing liquid-gas models. Below this threshold, results showed that the dispersed slug velocity needed to be considered as the flows were subject to higher interfacial contributions and inertial effects. A modification is proposed to an existing liquid-gas pressure drop correlation. This proposed modification extends the applicability of the correlation to liquid-liquid flows, and furthermore extends the non-dimensional limits of the correlation.

show abstract

Flow pattern, void fraction and pressure drop of two-phase air–water flow in a horizontal circular micro-channel

Cited by 92 publications

References 27 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

Estudio Experimental de Patrones de Flujo Bifásico Aire-Agua en Tuberías Horizontales y Ligeramente Inclinadas

Review and extension of pressure drop models applied to Taylor flow regimes

Contact Info

Product

Resources

About