Flow Simulation in Bubble Columns in Regard to Bubble Coalescence and Break-up Utilizing LES and DEM

2004 ◽  
Vol 37 (8) ◽  
pp. 976-989 ◽  
Author(s):  
Hiroshi Takeda ◽  
Norio Esaki ◽  
Kenji Doi ◽  
Hirofumi Murakami ◽  
Koichi Yamasaki ◽  
...  
Keyword(s):  
Flow Simulation ◽  
Bubble Columns ◽  
Bubble Coalescence ◽  
Break Up

Bubble coalescence and break-up in air-sparged bubble columns

AIChE Journal ◽  
1990 ◽  
Vol 36 (10) ◽  
pp. 1485-1499 ◽  
Author(s):  
Michael J. Prince ◽  
Harvey W. Blanch
Keyword(s):  
Bubble Columns ◽  
Bubble Coalescence ◽  
Break Up

Coalescence and Break-Up in Bubble Columns: Euler-Lagrange Simulations Using a Stochastic Approach

2013 ◽  
Vol 85 (7) ◽  
pp. 1118-1130 ◽  
Author(s):  
Michael C. Gruber ◽  
Stefan Radl ◽  
Johannes G. Khinast
Keyword(s):  
Stochastic Approach ◽  
Bubble Columns ◽  
Break Up

Simulation of Gas – Non-Newtonian Liquid Flow in a Rectangular Bubble Column by Considering Bubbles Interactions

2012 ◽  
Author(s):  
Erfan Niazi ◽  
Mehrzad Shams ◽  
Arash Elahi ◽  
Goodarz Ahmadi
Keyword(s):  
Liquid Flow ◽  
Bubble Column ◽  
Three Dimensional ◽  
Methyl Cellulose ◽  
Newtonian Liquid ◽  
Bubble Coalescence ◽  
Break Up ◽  
Bubble Rising ◽  
Momentum Coupling ◽  
Fluid Rheology

In this article a CFD model of a three-dimensional Eulerian-Lagrangian is developed for a gas - non-Newtonian liquid flow in a rectangular column. The model resolves the time-dependent, three-dimensional motion of gas bubbles in a liquid to simulate the trajectory of bubbles. Our model incorporates drag, gravity, buoyancy, lift, pressure gradient and virtual mass forces acting on a bubble rising in a liquid, and accounts for two-way momentum coupling between the phases. Population balance equation is solved to model bubble coalescence and break up. In bubble coalescence, Prince and Blanch model is used which can consider the effect of fluid rheology. Luo and Svendosen model was selected for bubble break up. The standard k-e turbulence model is selected for calculating turbulent flow properties. Power-law non-Newtonian liquid is selected for analysis of effect of different solutions of carboxy methyl cellulose in water. The effect of changing fluid to non-Newtonian is discussed in terms of velocity profile and gas hold up.

scholarly journals Impact of the Primary Break-Up Strategy on the Morphology of GDI Sprays in 3D-CFD Simulations of Multi-Hole Injectors

Energies ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2890 ◽  
Author(s):  
Sparacino ◽  
Berni ◽  
d’Adamo ◽  
Krastev ◽  
Cavicchi ◽  
...  
Keyword(s):  
Cfd Simulation ◽  
Direct Injection ◽  
Flow Simulation ◽  
Back Pressure ◽  
Operating Conditions ◽  
Gasoline Direct Injection ◽  
Ambient Conditions ◽  
Phase Doppler Anemometry ◽  
Break Up ◽  
Primary Break

The scientific literature focusing on the numerical simulation of fuel sprays is rich in atomization and secondary break-up models. However, it is well known that the predictive capability of even the most diffused models is affected by the combination of injection parameters and operating conditions, especially backpressure. In this paper, an alternative atomization strategy is proposed for the 3D-Computational Fluid Dynamics (CFD) simulation of Gasoline Direct Injection (GDI) sprays, aiming at extending simulation predictive capabilities over a wider range of operating conditions. In particular, attention is focused on the effects of back pressure, which has a remarkable impact on both the morphology and the sizing of GDI sprays. 3D-CFD Lagrangian simulations of two different multi-hole injectors are presented. The first injector is a 5-hole GDI prototype unit operated at ambient conditions. The second one is the well-known Spray G, characterized by a higher back pressure (up to 0.6 MPa). Numerical results are compared against experiments in terms of liquid penetration and Phase Doppler Anemometry (PDA) data of droplet sizing/velocity and imaging. CFD results are demonstrated to be highly sensitive to spray vessel pressure, mainly because of the atomization strategy. The proposed alternative approach proves to strongly reduce such dependency. Moreover, in order to further validate the alternative primary break-up strategy adopted for the initialization of the droplets, an internal nozzle flow simulation is carried out on the Spray G injector, able to provide information on the characteristic diameter of the liquid column exiting from the nozzle.

Pressure and gas density effects on bubble break-up and gas hold-up in bubble columns

1990 ◽  
Vol 45 (8) ◽  
pp. 2309-2315 ◽  
Author(s):  
Peter M. Wilkinson ◽  
Laurent L. v. Dierendonck
Keyword(s):  
Bubble Columns ◽  
Gas Density ◽  
Density Effects ◽  
Break Up

BUBBLE COALESCENCE AND BREAK-UP IN FERMENTATIONS

1981 ◽  
pp. 489-496B
Author(s):  
Christopher McBride ◽  
James Walter ◽  
Harvey W. Blanch ◽  
T.W.F. Russell
Keyword(s):  
Bubble Coalescence ◽  
Break Up

scholarly journals Bubble Coalescence on Photobioreactor Bubble Columns by Using Horizontal Baffle for Microalgae

Evergreen ◽  
2021 ◽  
Vol 8 (4) ◽  
pp. 861-865
Author(s):  
Juno Dwi Putra ◽  
Arif Rahman ◽  
Nining Betawati Prihantini ◽  
Deendarlianto ◽  
Nasruddin
Keyword(s):  
Bubble Columns ◽  
Bubble Coalescence
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