Numerical analysis of the effect of gas sparging on bubble column hydrodynamics

A discrete bubble model (DBM) has been used to study the effect of gas sparger properties on the hydrodynamics in a bubble column. As a first step the performance of the model was evaluated by comparison with experimental data. Subsequently, four different perforated plates with different sparged areas were used as a gas sparger. Distributions of liquid velocity, turbulent kinetic energy, and void fraction in the central plane were compared for the four different systems. Furthermore, the effect of the sparger location was also investigated. It was found that the liquid-phase circulation becomes more pronounced as the sparged area location is more distant from the center of the bottom plate. Finally, gas-phase residence time distributions (RTD) were obtained from the simulations. By employing standard axial dispersion model, the gas-phase mixing in the bubble column was characterized. Results show that the extent of mixing increased when the sparged area decreased. The axial dispersion coefficient increas...

[1]  J. Kuipers,et al.  Discrete particle simulation of bubble and slug formation in a two-dimensional gas-fluidised bed: A hard-sphere approach. , 1996 .

[2]  Gusheng Hu,et al.  Eulerian-Lagrangian based large-eddy simulation of a partially aerated flat bubble column , 2008 .

[3]  Tadashi Sakaguchi,et al.  Drag Coefficients of Single Bubbles under Normal and Micro Gravity Conditions , 1998 .

[4]  Aniruddha B. Pandit,et al.  EFFECT OF SPARGER DESIGN AND HEIGHT TO DIAMETER RATIO ON FRACTIONAL GAS HOLD-UP IN BUBBLE COLUMNS , 1998 .

[5]  Jam Hans Kuipers,et al.  Numerical simulation of the dynamic flow behavior in a bubble column : A study of closures for turbulence and interface forces , 2006 .

[6]  G. Hébrard,et al.  Influence of the gas sparger on the hydrodynamic behaviour of bubble columns , 1996 .

[7]  J. Smagorinsky,et al.  GENERAL CIRCULATION EXPERIMENTS WITH THE PRIMITIVE EQUATIONS , 1963 .

[8]  J. C. R. Hunt,et al.  The force exerted on a body in inviscid unsteady non-uniform rotational flow , 1988, Journal of Fluid Mechanics.

[9]  Jam Hans Kuipers,et al.  A three-demensional CFD model for gas-liquid bubble columns , 1999 .

[10]  Jyeshtharaj B. Joshi,et al.  Laser doppler anemometer measurements in bubble column : Effect of sparger , 2006 .

[11]  Niels G. Deen,et al.  Parallelization of an Euler-Lagrange model using mixed domain decomposition and a mirror domain technique: Application to dispersed gas-liquid two-phase flow , 2006, J. Comput. Phys..

[12]  Martin Sommerfeld,et al.  Euler/Lagrange Calculations of Bubbly Flows with Consideration of Bubble Coalescence , 2008 .

[13]  J. Kuipers,et al.  Dynamic simulation of dispersed gas-liquid two phase flow using a discrete bubble model. , 1996 .

[14]  Yatish T. Shah,et al.  Design parameters estimations for bubble column reactors , 1982 .

[15]  A. W. Vreman.  An eddy-viscosity subgrid-scale model for turbulent shear flow: Algebraic theory and applications , 2004 .

[16]  J. Joshi,et al.  MEASUREMENT OF GAS HOLD-UP PROFILES BY GAMMA RAY TOMOGRAPHY: Effect of Sparger Design and Height of Dispersion in Bubble Columns , 1999 .

[17]  D. Darmana,et al.  Numerical study of homogeneous bubbly flow: Influence of the inlet conditions to the hydrodynamic behavior , 2009 .