A Comprehensive One-Dimensional Model for Prediction of Flow Pattern in Bubble Columns

CFD predictions for flow‐regime transitions in bubble columns

“…Several authors [3][4][5][6][7][8] have discussed recent developments in the fields of modeling and CFD simulation. A literature study reveals the use of simple one-dimensional models, [9][10][11][12] two-dimensional (2-D) gas-liquid mixture models, [13][14][15][16] 2-D and 3-D turbulent CFD approaches for flowfield computations combined with a compartmental model for handling chemistry computations, 17 2-D and 3-D two-fluid turbulent models with variations in the formulation of the Euler-Euler or the Eulerian-Lagrangian approach, [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] and large-eddy simulation (LES) attempts. 35,36 In our previous work with the two-fluid model, 37 it was observed that grid-independent CFD simulations of air-water bubble columns are sensitive to the physical models and chosen parameters used in the simulations.…”

Experiments and modelling of a draft tube airlift reactor operated at high gas throughputs

“…With such gas injection, a large liquid recirculation is progressively formed in the airlift riser (Wongsuchoto and Pavasant, 2004). This liquid recirculation is similar to those formed in conventional bubble columns if the gas injection is not uniformly distributed on the column cross section (Lockett and Kirkpatrick, 1975;Molerus and Kurtin, 1986;Becker et al, 1994;Vitankar and Joshi, 2002). Consequently, compared to standard airlift reactors, the study of annulus sparged airlift is made difficult because of the complexity of gas-liquid hydrodynamics in the riser, especially in the case of high gas throughputs.…”

Validation of Two-Fluid Simulations of a Pseudo-Two-Dimensional Bubble Column with Uniform and Nonuniform Aeration

“…Over the past thirty years, the research group of Professor J. B. Joshi at the Mumbai University Institute of Chemical Technology has pioneered many of the experimental and computational methods currently used for investigating and modeling the flow behavior in bubble-column reactors 2,[6][7][8][9][10][11][12][13][14] (see also references therein). It is thus with great pleasure that we contribute this paper in honor of his many contributions to the field on the occasion of his 60th birthday.…”

“…As computational resources have increased over the years, so have the complexity of the bubble column flow models considered. Several researchers have utilized simpler approaches, such as one-dimensional models or two-dimensional (2D) gas−liquid mixture models. , There are numerous studies that have applied either the Euler−Euler or the Euler−Lagrange approach within 2D or 3D two-fluid turbulent models. − Large-eddy simulation (LES) studies have also been reported in the literature. , Additionally, several researchers have reported on the prediction of flow-regime transitions using either numerical simulations or linear stability analysis of various model equations. ,,− …”