The onset of slugging in horizontal stratified air-water flow

Wallis, G.B.; Dodson, John E.

doi:10.1016/0301-9322(73)90010-4

Cited by 241 publications

(90 citation statements)

References 3 publications

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“…Weisman< 7 l included some fluid properties to define the transition line correlations more accurately. Some theoretical and mostly experimental work have been carried out on wave initiation and slugging by Wallis & Dobson< 8 .<22l-< 2 <) and Nakamura et az.<n) Since two-phase flow systems are difficult to predict in details, careful experimentation are necessary in better understanding of the dynamic response of a system. Therefore, this work aimed at experimental consideration of the transient two-phase air-water stratified flow regime under atmospheric conditions in horizontal duct.…”

Section: Introduction 1 Review Of Previous Studies Andmentioning

confidence: 99%

Experimental Investigation on Wave Initiation and Slugging of Air-Water Stratified Flow in Horizontal Duct

Ansari

Nariai

1989

Journal of Nuclear Science and Technology

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Two-phase air-water flow was studied experimentally under atmospheric conditions Wave growth and slugging from stratified flow regime in a horizontal duct were analyzed by using a video camera. The result for slug initiation was compared with the instability criteria based on linear analysis and the empirical correlations of other researchers. The required instability criteria is in good agreement. The reason for the necessary lower gas velocity in comparison with Kelvin-Helmholtz relation and growth of short wavelength waves which create slugs were discussed and presented by some pictures. The result of this kind of careful experimentation was aimed in verification of inherent problems which are contained in two fluid models.

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Section: Introduction 1 Review Of Previous Studies Andmentioning

confidence: 99%

Experimental Investigation on Wave Initiation and Slugging of Air-Water Stratified Flow in Horizontal Duct

Ansari

Nariai

1989

Journal of Nuclear Science and Technology

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“…Para h/D = 0, 5, C 2 é igual a 0, 5, no qual é consistente com o resultado de Wallis e Dobson [27]. Kordyban e Ranov [28] analisaram a transição do escoamento estratificado de água e ar para o escoamento em golfadas (slug flow) entre placas horizontais paralelas.…”

Section: Transição Do Escoamento Estratificadounclassified

Análise e Estudo de Estabilidade do Padrão de Escoamento Golfadas Severas num Sistema Pipeline-Riser Acoplado ao VASPS

Nascimento¹,

Fortaleza²

2018

Anais Do X Congresso Nacional De Engenharia Mecânica

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“…The effects of the flow on the quantities (such as flow rate, pressure drop and flow regimes) have been always of engineering interest. Wallis and Dobson [1] analysed the onset of slugging in horizontal and near horizontal gas-liquid flows. A prediction of horizontal flow regime transitions in pipes was introduced by Taitel and Dukler [2].…”

Section: Introductionmentioning

confidence: 99%

Modelling of stratified two phase flows using an interfacial area density model

Höhne

Vallée

2009

Computational Methods in Multiphase Flow V

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Stratified two-phase flow regimes can occur in chemical plants, nuclear reactors and oil pipelines. A relevant problem is the development of wavy stratified flows which can lead to slug generation. The slug flow regime is characterized by an acceleration of the gaseous phase and by the transition of fast liquid slugs, which carry a significant amount of liquid with high kinetic energy. It is potentially hazardous to the structure of the system due to the strong oscillating pressure levels formed behind the liquid slugs as well as the mechanical momentum of the slugs. Because these flow conditions cannot be predicted with the required accuracy and spatial resolution by the one-dimensional system codes, the stratified flows are increasingly modelled with computational fluid dynamics (CFD) codes. In CFD, closure models are required that must be validated. The recent improvements of the multiphase flow modelling in the ANSYS CFX code make it now possible to simulate these mechanisms in detail. In order to validate existing multiphase flow models and to further develop these, measurement data with a high-resolution in time and also in space are needed. For the experimental investigation of co-current air/water flows, the HAWAC (Horizontal Air/Water Channel) was built. The channel allows in particular the study of air/water slug flow under atmospheric pressure. Parallel to the experiments, CFD calculations were carried out. The two-fluid model was applied with a special turbulence damping procedure at the free surface. An Algebraic Interfacial Area Density (AIAD) model on the basis of the implemented mixture model was introduced, which allows the detection of the morphological form of the two phase flow and the corresponding switching via a blending function of each correlation from one object pair to another. As a result this model can distinguish between bubbles, droplets and the free surface. The behaviour of slug generation and propagation at the experimental setup was qualitatively reproduced by the simulation, while local deviations require a continuation of the work. The creation of small instabilities due to pressure surge or an increase of interfacial momentum should be analysed in the future. Furthermore, experiments with pressure and velocity measurements are planned and will allow quantitative comparisons, also at other superficial velocities.

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The onset of slugging in horizontal stratified air-water flow

Cited by 241 publications

References 3 publications

Experimental Investigation on Wave Initiation and Slugging of Air-Water Stratified Flow in Horizontal Duct

Experimental Investigation on Wave Initiation and Slugging of Air-Water Stratified Flow in Horizontal Duct

Análise e Estudo de Estabilidade do Padrão de Escoamento Golfadas Severas num Sistema Pipeline-Riser Acoplado ao VASPS

Modelling of stratified two phase flows using an interfacial area density model

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