Flow pattern transition for gas-liquid flow in horizontal and inclined pipes. Comparison of experimental data with theory

This article proposes a numerical resolution of a one-dimensional (1D), transient, simplified two-fluid model regularized with an artificial diffusion term for modeling stratified, wavy and slug flow in horizontal and nearly horizontal pipes. Artificial diffusion is introduced to prevent the unbounded growth of instabilities where the 1D two-fluid model is ill-posed. We propose a method to set the artificial diffusion case by case to obtain the desired cut-off at short wavelengths by combining the choice of the spatial discretisation and the amplification factors obtained by the linear stability analysis of the model. A proper criterion to simulate two-phase to single-phase flow transition, which occurs during slug formation, is also developed. Flow pattern transitions have been numerically computed and compared against theoretical transition boundaries and experimental observations. Moreover, we showed that the developed code computes slug initiation and slug characteristics, in a reasonably accurate way considering the simplicity of the model, comparing numerical results with well-known empirical correlations and experimental data. Furthermore, the model simplicity leads to a computationally-inexpensive numerical resolution; this can be useful in engineering applications where obtaining fast numerical results is fundamental, such as applications involving automated control for two-phase flows.

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“…In the Supplementary Material, a validation against the experimental flow pattern map reported in [45] is exposed.…”

Section: Flow Pattern Map and Code Validationmentioning

confidence: 99%

Simplified 1D Incompressible Two-Fluid Model with Artificial Diffusion for Slug Flow Capturing in Horizontal and Nearly Horizontal Pipes

2017

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“…One of the most common geometries used to mix the two phases at the inlet, is a tee type mixer [4]. The mixer used in this study to bring the two phases together, is shown in Fig.…”

Section: Experimental Setup and Data Reductionmentioning

confidence: 99%

“…Since flow patterns strongly depend on the channel inclination angle, many experiments have been performed for horizontal, inclined and vertical channels. Prediction of established two-phase flow patterns by obtaining flow pattern maps has been the principal objective in many fundamental researches [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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An experimental investigation on the effect of middle length and inclination angle of S-shaped channel on two-phase flow patterns

Azadi

Gheisari

Ansari

2014

Experimental Thermal and Fluid Science

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An experimental investigation is conducted to study the effect of middle length and inclination angle of an S-shaped channel on adiabatic two-phase flow patterns. To study this effect, three channel lengths of 0.25, 0.50, and 1.00 m, and four bends at the angles of 22.5˚, 45˚, A dimensionless analysis of obtained flow pattern maps is also carried out. It is shown that effect of geometry changes along S-shaped pipeline on two-phase flow pattern transitions is determined by either inclination angle or elevation difference between two horizontal lines. The explained flow mechanisms, obtained flow pattern maps and the transition lines can be used to predict the particular flow pattern that will be established for a given mass flux, inclined length and angle along pipelines.

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“…The influence of the filling degree of the separator was investigated with a water/glycerine mixture at atmospheric pressure and downward inclina It is well known in two-phase flow that the flow pattern is very sensitive to the slope of the tube, especially in upward flow (Barnea et al 1980, Spedding and Chen 1982, Taitel and Dukler 1976. for the test condition a", is the flow pattern changed.…”

Section: Influence Of the Separatormentioning

confidence: 99%

Centrifugal scaling of isothermal gas-liquid flow in horizontal tubes

Geraets

1988

International Journal of Multiphase Flow

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Flow pattern transition for gas-liquid flow in horizontal and inclined pipes. Comparison of experimental data with theory

Cited by 226 publications

References 17 publications

Simplified 1D Incompressible Two-Fluid Model with Artificial Diffusion for Slug Flow Capturing in Horizontal and Nearly Horizontal Pipes

Simplified 1D Incompressible Two-Fluid Model with Artificial Diffusion for Slug Flow Capturing in Horizontal and Nearly Horizontal Pipes

An experimental investigation on the effect of middle length and inclination angle of S-shaped channel on two-phase flow patterns

Centrifugal scaling of isothermal gas-liquid flow in horizontal tubes

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