Three-dimensional volume of fluid simulations on bubble formation and dynamics in bubble columns

2012 ◽  
Vol 73 ◽  
pp. 55-78 ◽  
Author(s):  
Zhang Yujie ◽  
Liu Mingyan ◽  
Xu Yonggui ◽  
Tang Can
Keyword(s):  
Bubble Formation ◽  
Three Dimensional ◽  
Volume Of Fluid ◽  
Bubble Columns

Numerical Investigation of Countercurrent Two-Phase Flows Using Three-Dimensional Volume-of-Fluid Simulations

2011 ◽  
Author(s):  
Gae¨l Gue´don ◽  
Emanuela Colombo ◽  
Fabio Inzoli
Keyword(s):  
Two Phase Flow ◽  
Three Dimensional ◽  
Volume Of Fluid ◽  
Immiscible Fluids ◽  
Vof Method ◽  
Operating Conditions ◽  
Bubble Columns ◽  
Phase Flow ◽  
Two Phase Flows ◽  
Two Phase

Several engineering plants and components, such as nuclear reactors, boilers, bubble columns, chemical reactors or oil/gas wells may be characterized by two-phase flows. Appropriate and safe operation of these systems may be supported by the accurate prediction of the multiphase flow pattern with consistent estimation of the void fraction and flooding phenomenon. A preliminary approach for modeling flow patterns in countercurrent two-phase flows in vertical systems, based on the volume-of-fluid (VOF) method, is here presented. The general objective of the study is to investigate the feasibility of large scale two-phase systems simulations using the VOF method. The specific objective is to provide a first set of qualitative information about the fluid dynamics structures in this flow at specific operating conditions. Three-dimensional simulations are performed using a finite volume commercial CFD code. Validation of the numerical approach is achieved with experimental data taken from literature for typical air-water flows in bubble columns. The interaction of the downward water recirculation with the bubbles of air is indeed representative of a bubbly countercurrent two-phase flow and therefore may be a valuable test case. The use of the VOF method is here privileged, since no further closure relations are needed for exchange coefficients between the continuous and dispersed phases, and for breakup and coalescence of bubbles/drops. The validated model is therefore most likely applicable in complex situations where the flow behavior is unknown. Finally a specific analysis of a countercurrent two-phase flow is presented with the objective of simulating the flow within an industrial pipe where two immiscible fluids, with different density are injected. A fluid “A” is injected at the bottom of the pipe and it is supposed to exit the pipe in the upper part. A fluid “B”, immiscible in “A”, is injected at the top of the pipe in countercurrent and it is supposed not to influence the path of fluid “A” from inlet to the exit. Fluid “B” may be used for reacting somehow with fluid “A”, but in this paper only the fluid dynamic condition is considered.

Hydrodynamics and Mixer-Induced Bubble Formation in Micro Bubble Columns with Single and Multiple-Channels

2006 ◽  
Vol 29 (9) ◽  
pp. 1015-1026 ◽  
Author(s):  
V. Haverkamp ◽  
V. Hessel ◽  
H. Löwe ◽  
G. Menges ◽  
M. J. F. Warnier ◽  
...  
Keyword(s):  
Bubble Formation ◽  
Bubble Columns ◽  
Multiple Channels ◽  
Micro Bubble

A Model of Bubble Nucleation on a Micro Line Heater

1999 ◽  
Vol 121 (1) ◽  
pp. 220-225 ◽  
Author(s):  
S.-D. Oh ◽  
S. S. Seung ◽  
H. Y. Kwak
Keyword(s):  
Bubble Formation ◽  
Three Dimensional ◽  
Bubble Nucleation ◽  
Heat Diffusion ◽  
Nucleation Theory ◽  
Molecular Cluster ◽  
Heater Surface ◽  
Calculation Results ◽  
Critical Bubble ◽  
Superheat Limit

The bubble nucleation mechanism on a cavity-free micro line heater surface was studied by using the molecular cluster model. A finite difference numerical scheme for the three-dimensional transient conduction equation for the liquid was employed to estimate the superheated volume where homogeneous bubble nucleation could occur due to heat diffusion from the heater to the liquid. Calculation results revealed that bubble formation on the heater is possible when the temperature at the hottest point in the heater is greater than the superheat limit of the liquid by 6°C–12°C, which is in agreement with the experimental results. Also it was found that the classical bubble nucleation theory breaks down near the critical point where the radius of the critical bubble is below 100 nm.

Volume-of-Fluid Interface Tracking with Smoothed Surface Stress Methods for Three-Dimensional Flows

1999 ◽  
Vol 152 (2) ◽  
pp. 423-456 ◽  
Author(s):  
Denis Gueyffier ◽  
Jie Li ◽  
Ali Nadim ◽  
Ruben Scardovelli ◽  
Stéphane Zaleski
Keyword(s):  
Surface Stress ◽  
Three Dimensional ◽  
Volume Of Fluid ◽  
Interface Tracking ◽  
Fluid Interface

scholarly journals Acoustic and visual study of bubble formation processes in bubble columns staged with fibrous catalytic layers

2003 ◽  
Vol 79-80 ◽  
pp. 151-157 ◽  
Author(s):  
V. Höller ◽  
M. Ruzicka ◽  
J. Drahos ◽  
L. Kiwi-Minsker ◽  
A. Renken
Keyword(s):  
Bubble Formation ◽  
Bubble Columns ◽  
Formation Processes ◽  
Visual Study ◽  
Catalytic Layers

A Viscoelastic VOF-PROST Code for the Study of Drop Deformation

Volume 3 ◽  
2004 ◽  
Author(s):  
Y. Renardy ◽  
M. Renardy ◽  
T. Chinyoka ◽  
D. B. Khismatullin ◽  
J. Li
Keyword(s):  
Surface Tension ◽  
Constitutive Equation ◽  
Viscoelastic Medium ◽  
Three Dimensional ◽  
Surface Tension Force ◽  
Volume Of Fluid ◽  
Tension Force ◽  
Drop Deformation ◽  
Volume Of Fluid Method ◽  
Viscoelastic Liquids

A volume of fluid method is developed with a parabolic representation of the interface for the surface tension force (VOF-PROST). This three-dimensional transient code is extended to treat viscoelastic liquids with the Oldroyd-B constitutive equation. Simulations of deformation for a Newtonian drop in a viscoelastic medium under shear are reported.

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