A unified model for predicting flow-pattern transitions for the whole range of pipe inclinations

Barnea, Dvora

doi:10.1016/0301-9322(87)90002-4

Cited by 596 publications

(199 citation statements)

References 15 publications

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“…and d cb is the maximal size of drop diameter above which buoyant forces overcome turbulent dispersive forces in the continuous phase and therefore, migration of the drops towards the tube walls takes place (Barnea, 1987):…”

Section: Transition From (S) To (Sm) or (Sw) -This Boundary Defines Tmentioning

confidence: 99%

Liquid-Liquid Two-Phase Flow Systems

Brauner

2003

Modelling and Experimentation in Two-Phase Flow

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Section: Transition From (S) To (Sm) or (Sw) -This Boundary Defines Tmentioning

confidence: 99%

Liquid-Liquid Two-Phase Flow Systems

Brauner

2003

Modelling and Experimentation in Two-Phase Flow

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“…In the literature, two flow pattern maps for two-phase flows in inclined tubes are available for the whole range of inclination angles: the flow pattern map of Barnea (1987) and the flow pattern of Crawford et al (1985). The flow pattern map of Barnea (1987) uses the criterion of Taitel and Dukler (1976) for the stratified-non-stratified transition. However, Lips and Meyer (2012a) showed that this criterion highly underestimated the mass flux for which the transition occurs.…”

Section: Determination Of the Stratified Flow Conditionmentioning

confidence: 99%

Stratified flow model for convective condensation in an inclined tube

Lips

Meyer

2012

International Journal of Heat and Fluid Flow

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Experimental data are reported for condensation of R134a in an 8.38 mm inner diameter smooth tube in inclined orientations with a mass flux of 200 kg/m²s. Under these conditions, the flow is stratified and there is an optimum inclination angle, which leads to the highest heat transfer coefficient. There is a need for a model to better understand and predict the flow behaviour. In this paper, the state of the art of existing models of stratified two-phase flows in inclined tubes is presented, whereafter a new mechanistic model is proposed. The liquidvapour distribution in the tube is determined by taking into account the gravitational and the capillary forces.The comparison between the experimental data and the model prediction showed a good agreement in terms of heat transfer coefficients and pressure drops. The effect of the interface curvature on the heat transfer coefficient has been quantified and has been found to be significant. The optimum inclination angle is due to a balance between an increase of the void fraction and an increase in the falling liquid film thickness when the tube is inclined downwards. The effect of the mass flux and the vapour quality on the optimum inclination angle has also been studied.

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“…En esta sección se evalúa la precisión de los modelos mecanicistas de Taitel y Dukler (1976), TDMM; Barnea (1987), BMM; Xiao et al (1990), XMM, y Ouyang y Aziz (2002), OAMM y de los modelos de correlación de Mandhane et al (1974), MMC, y Mukherjee y Brill (1985), MBMC, en la determinación de los patrones de flujo. El modelo de Mandhane et al (1974), es aplicable únicamente para flujo horizontal.…”

Section: Precisión De Los Modelos De Predicción De Patrones De Flujounclassified

“…El modelo de correlación de Mukherjee y Brill (1985), presenta un porcentaje de aciertos de 76.5%. Sin embargo, los modelo mecanicistas de Xiao et al (1990), Barnea (1987) y Taitel y Dukler (1976, son mas precisos, con porcentajes de aciertos de 81.0 %, 83.3 % y 86.9 %, respectivamente.…”

Section: Precisión De Los Modelos De Predicción De Patrones De Flujounclassified

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

García

Haoulo

2009

Inf. tecnol.

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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%.

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A unified model for predicting flow-pattern transitions for the whole range of pipe inclinations

Cited by 596 publications

References 15 publications

Liquid-Liquid Two-Phase Flow Systems

Liquid-Liquid Two-Phase Flow Systems

Stratified flow model for convective condensation in an inclined tube

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

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