A coupled model for simulation of the gas–liquid two-phase flow with complex flow patterns

Yan, Kai; Che, Defu

doi:10.1016/j.ijmultiphaseflow.2009.11.007

Cited by 69 publications

(32 citation statements)

References 39 publications

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“…The coupled model developed by the authors [25], which can deal with the multiphase flow with the gas-liquid interfaces of different length scales, is used in consideration of the existence of dispersed small bubbles. For approximating real slug flows, a quasi slug flow, where two hypotheses are imposed, was built to avoid some physical phenomena difficult to deal with using the reported numerical models.…”

Section: Numerical Model and Resultsmentioning

confidence: 99%

“…For this problem, the authors [24] devoted a special effort and simulated a single Taylor bubble flowing in a vertical pipe with dispersed small bubbles, using the coupled model developed by the authors [25], which can deal with the multiphase flow with the gas-liquid interfaces of different length scales. For approximating real slug flows, a quasi slug flow, where two hypotheses are imposed, was built to avoid some physical phenomena difficult to deal with using the reported numerical models.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study on near wall transport characteristics of slug flow in a vertical pipe

2012

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In this work, the wall shear stress and the mass transfer coefficient of the gas-liquid two-phase upward slug flow in a vertical pipe are investigated experimentally, using limiting diffusion current probes and digital highspeed video system. In experiments, the instantaneous and averaged characteristics of wall shear stress and mass transfer coefficient are concerned. The experimental results are compared with the numerical results in previous paper of the authors. Both experiment and numerical simulation show that the superficial gas and liquid velocities have an obvious influence on the instantaneous characteristics of the two profiles. The mass transfer coefficient has characteristics similar to the wall shear stress. The instantaneous wall shear stress and mass transfer coefficient profiles have the periodicity of slug flow. The averaged wall shear stress and mass transfer coefficient increase with increased superficial gas velocity. However, there is inconsistency in the variation trends of the averaged wall shear stress and mass transfer coefficient with superficial liquid velocity between experimental result and numerical simulation result, which can be attributed to the difference in flow condition. Moreover, the Taylor bubble length is also another impacting factor. The experimental and numerical results all shows that the product scale can not be damaged directly by the flow movement of slug flow. In fact, the alternative forces and fluctuations with high frequency acting on the pipe wall due to slug flow is the main cause for the slug flow enhanced CO 2 corrosion process.

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Section: Numerical Model and Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental study on near wall transport characteristics of slug flow in a vertical pipe

2012

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“…The interaction of flooding flows with structures is a classic and important problem in many engineering applications, such as the green water loading [1,2], dam break flowing over an obstacle [3,4], and the wave breaking problem [5]. The unsteady loads caused by the flooding flow on fixed or floating structures have unnegligible influence on the design of marine structures [6] and marine vessels [7,8].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation on Interface Evolution and Impact of Flooding Flow

Kan

et al. 2015

Shock and Vibration

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A numerical model based on Navier-Stokes equation is developed to simulate the interface evolution of flooding flows. The twodimensional fluid domain is discretised by structured rectangular elements according to finite volume method (FVM). The interface between air and liquid is captured through compressive interface capturing scheme for arbitrary meshes (CICSAM) based on the idea of volume of fluid (VOF). semiimplicit method for pressure linked equations (SIMPLE) scheme is used for the pressure-velocity coupling. A second order upwind discretization scheme is applied for the momentum equations. Both laminar flow model and turbulent flow model have been studied and the results have been compared. Previous experiments and other numerical solutions are employed to verify the present results on a single flooding liquid body. Then the simulation is extended to two colliding flooding liquid bodies. The impacting force of the flooding flow on an obstacle has been also analyzed. The present results show a favourable agreement with those by previous simulations and experiments.

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“…Thus, if constitutive equations of the drag coefficient and the interfacial area concentration were refined, the accuracy of the void fraction and the frictional pressure drop predictions will be improved. Although many studies on the interfacial friction force and/or the drag coefficient (12)- (14) in slug flow have been conducted analytically, there are few papers on the effects of liquid viscosity and surface tension in small diameter pipes. In this paper, the drag coefficient and the interfacial friction force have been studied for gas-liquid two-phase slug flow in vertical small diameter circular pipes of 5 and 9 mm i.d.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Gas-Liquid Two-Phase Slug Flow Characteristics in Vertical Small Diameter Pipes by a One-Dimensional Two-Fluids Model

Tsubone

Kawahara

Sadatomi

2011

JFST

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The purpose of this study is to improve a two-fluid model applicable to gas-liquid two-phase slug flows in small diameter pipes. Experimental data on void fraction and frictional pressure drop were obtained for vertical upward slug flow in 5 and 9 mm i.d. circular pipes, and those on the interfacial friction force were obtained by substituting the above data into an equation derived from the one-dimensional two-fluids model. The test liquids were a Poly-oxy-ethylene lauryl ether water solution, a 72 wt% glycerin water solution and a tap water at 30 °C, while the test gas was air at near atmospheric pressure. In order to study the effects of liquid properties, surface tension of the test liquids against air was varied from 0.042 to 0.071 N/m, viscosity was 0.797 to 19.6 mPa·s, and density was 996 to 1184 kg/m 3 .The range of volumetric flux of the liquid was 0.1 to 2.0 m/s, and that of the gas was 0.1 to 22 m/s. In addition, the drag coefficient data of the large bubble was determined from the data on the bubble diameter, the respective void fractions of the liquid slug section and the large bubble one, the interfacial friction force and the length ratio of the large bubble to the total of the liquid slug and the large bubble. These data were used to validate representative two-fluid model codes. Since the prediction by the codes did not fit well the present data, a new drag coefficient correlation for the large bubble was proposed using 5 dimensionless parameters. The predictions by the new correlation and familiar ones in literatures have been tested against the present data, and the applicability of the new one has been demonstrated.

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A coupled model for simulation of the gas–liquid two-phase flow with complex flow patterns

Cited by 69 publications

References 39 publications

Experimental study on near wall transport characteristics of slug flow in a vertical pipe

Experimental study on near wall transport characteristics of slug flow in a vertical pipe

Numerical Simulation on Interface Evolution and Impact of Flooding Flow

Prediction of Gas-Liquid Two-Phase Slug Flow Characteristics in Vertical Small Diameter Pipes by a One-Dimensional Two-Fluids Model

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