scholarly journals COMPUTATIONAL FLUID DYNAMICS SIMULATIONS OF TAYLOR BUBBLE RISE IN FLOWING LIQUIDS

2021 ◽  
Vol 36 (2) ◽  
pp. 35-42
Author(s):  
H.A Abubakar
Keyword(s):  
Finite Element ◽  
Fluid Dynamic ◽  
Total Curvature ◽  
Rise Velocity ◽  
Systematic Analysis ◽  
Taylor Bubble ◽  
Bubble Rise ◽  
Bubble Rise Velocity ◽  
Bubble Rising ◽  
Dynamics Simulations

Systematic analysis of the effect of gravitational, interfacial, viscous and inertia forces acting on a Taylor bubble rising in flowing liquids characterised by the dimensionless Froude (Uc), inverse viscosity (Nf ) and Eötvös numbers (Eo) is carried out using computational fluid dynamic finite element method. Particular attention is paid to cocurrent (i.e upward) liquid flow and the influence of the characterising dimensionless parameters on the bubble rise velocity and morphology analysed for Nf, Eo and Uc ranging between [40, 100], [20, 300] and [−0.20, 0.20], respectively. Analysis of the results of the numerical simulations showed that the existing theoretical model for the prediction of Taylor bubble rise velocity in upward flowing liquids could be modified to accurately predict the rise velocity in liquids with high viscous and surface tension effects. Furthermore, the mechanism governing the change in morphology of the bubble in flowing liquids was shown to be the interplay between the viscous stress and total curvature stress at the interface. Keywords: Taylor bubble, finite element, slug flow, CFD, rise velocity

Prediction model and energy dissipation analysis of Taylor bubble rise velocity in yield stress fluid

2020 ◽  
Vol 396 ◽  
pp. 125261
Author(s):  
Wenqiang Lou ◽  
Zhiyuan Wang ◽  
Shaowei Pan ◽  
Baojiang Sun ◽  
Jianbo Zhang ◽  
...  
Keyword(s):  
Energy Dissipation ◽  
Prediction Model ◽  
Yield Stress ◽  
Rise Velocity ◽  
Taylor Bubble ◽  
Bubble Rise ◽  
Yield Stress Fluid ◽  
Bubble Rise Velocity

Upward Vertical Two-Phase Flow Through an Annulus—Part I: Single-Phase Friction Factor, Taylor Bubble Rise Velocity, and Flow Pattern Prediction

1992 ◽  
Vol 114 (1) ◽  
pp. 1-13 ◽  
Author(s):  
E. F. Caetano ◽  
O. Shoham ◽  
J. P. Brill
Keyword(s):  
Flow Pattern ◽  
Friction Factor ◽  
Single Phase ◽  
Rise Velocity ◽  
Flow Conditions ◽  
Two Phase ◽  
Taylor Bubble ◽  
Bubble Rise ◽  
Bubble Rise Velocity ◽  
Flow Through

Upward gas-liquid flow through vertical concentric and fully eccentric annuli was studied both experimentally and theoretically. A flow system was designed and constructed for this study. The system consists of a 16-m long vertical annulus with 76.2-mm i.d. casing and 42.2-mm o.d. tubing. A comprehensive experimental investigation was conducted for both concentric and fully eccentric annuli configurations, using air-water and air-kerosene mixtures as the flowing fluids. Included were definition and classification of the existing flow patterns and development of flow pattern maps. Measurements of volumetric average liquid holdup and average total pressure gradient were made for each flow pattern for a wide range of flow conditions. Additional data include single-phase friction factor values and Taylor bubble rise velocities in a stagnant liquid column. Data analysis revealed that application of the hydraulic diameter concept for annuli configurations is not always adequate, especially at low Reynolds number flow conditions. A more rigorous approach was thus required for accurate prediction of the flow behavior, especially for two-phase flow. Part I of the study includes experimental data and analyses of single-phase friction factor, Taylor bubble rise velocity, and flow pattern transition boundaries.

Numerical Simulation of Single Bubble Moving in Stagnant Solid-Liquid Mixture Pool Using Finite Volume Particle Method

2013 ◽  
Author(s):  
Yuki Aramaki ◽  
Takahito Suzuki ◽  
Ichiro Miya ◽  
Liancheng Guo ◽  
Koji Morita
Keyword(s):  
Liquid Mixture ◽  
Single Bubble ◽  
Phase Flow ◽  
Bubble Shape ◽  
Rise Velocity ◽  
Bubble Rise ◽  
Bubble Rise Velocity ◽  
Three Phase ◽  
Three Phase Flow ◽  
Fluid Interactions

Three-phase flow formed in a disrupted core of nuclear reactors is one of the key phenomena to be simulated in reactor safety analysis. Particle-based simulation could be a powerful CFD tool to understand and clarify local thermal-hydraulic behaviors involved in such three-phase flows. In the present study, to develop a computational framework for three-phase flow simulations, a single bubble moving in a stagnant solid particle-liquid mixture pool was simulated using the finite volume particle (FVP) method. The simulations were carried out in a two dimensional system. The bubble shape change and the bubble rise velocity were compared with the newly performed experiments, which used solid particulate glasses of 0.9 mm in diameter, liquid silicone and air. The two-phase flow simulation of a single bubble rising in a stagnant liquid pool reproduced measured bubble shape and bubble rise velocity reasonably. On the other hand, the bubble rise velocity in a stagnant particle-liquid mixture pool was overestimated in comparison with the measurement. This result suggests that particle-particle and particle-fluid interactions would have dominant influence on bubble motion behavior in the particle-liquid mixture pool under the present multiphase conditions. To evaluate such interactions in the simulations, the particle-particle interactions were modeled by the distinct element method (DEM), while two models were applied to represent particle-fluid interactions. One is the theoretical model for apparent viscosity of particle-liquid mixture, which describes the viscosity increase of liquid mixed with solids based on the Frankel-Acrivos equation. The other is the drag force model for solid-fluid interactions. In the present study, we took the Gidaspow drag correlation, which is a combination of the Ergun equation and Wen-Yu equation. A comparison of both the transient bubble shape and bubble rise velocity between the results of experiment and simulation demonstrates that the present computational framework based on the FVP method and solid-phase interaction models is useful for numerical simulations of a single bubble moving in a stagnant solid particle-liquid mixture pool.

Bubble rise velocity in two-dimensional fluidized beds

1995 ◽  
Vol 84 (3) ◽  
pp. 283-285 ◽  
Author(s):  
Dinesh Gera ◽  
Mridul Gautam
Keyword(s):  
Fluidized Beds ◽  
Two Dimensional ◽  
Rise Velocity ◽  
Bubble Rise ◽  
Bubble Rise Velocity
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