Void fraction disturbances in a uniform bubbly fluid

Biesheuvel, A.; Gorissen, W.C.M.

doi:10.1016/0301-9322(90)90055-n

Cited by 97 publications

(75 citation statements)

References 14 publications

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“…The short term result of this instability is the appearance of vertically propagating, horizontally oriented kinematic waves (see chapter 16) in otherwise nominally steady flows. They have been most extensively researched in fluidized beds but have also be observed experimentally in vertical bubbly flows by Bernier (1982), Boure and Mercadier (1982), Kytomaa and Brennen (1990) (who also examined solid/liquid mixtures at large Reynolds numbers) and analyzed by Biesheuvel and Gorissen (1990). (Some further comment on these bubbly flow measurements is contained in section 16.2.3.…”

Section: Inhomogeneity Instability In Vertical Flowsmentioning

confidence: 99%

Fundamentals of Multiphase Flow

Brennen

2005

821

550

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Section: Inhomogeneity Instability In Vertical Flowsmentioning

confidence: 99%

Fundamentals of Multiphase Flow

Brennen

2005

821

550

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“…This model is applied only in the dispersed-phase momentum balance (i.e., P c ) 0) and is defined by Biesheuvel and Gorissen 38 as…”

Section: Review Of Model Formulationmentioning

confidence: 99%

“…33,34 Additionally, several researchers have reported on the prediction of flow-regime transitions using either numerical simulations 35 or linear stability analysis of various model equations. 13,14,[36][37][38][39][40][41][42][43][44][45] It may be noted that the time-dependent Eulerian two-fluid models for homogeneous bubbly flow tend to predict transitions to nonuniform and heterogeneous flow at very low values of the average gas holdup (usually less than 0.2). However, an opposite trend was observed in the recent experiments of Harteveld et al [46][47][48] at Delft University of Technology, who observed homogeneous bubbly flow up to average gas holdups of 0.5.…”

Section: Introductionmentioning

confidence: 99%

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

Monahan

Fox

2009

Ind. Eng. Chem. Res.

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The multiphase flow simulated in this work corresponds to the pseudo-2D bubble-column experiments at Delft University of Technology (Harteveld et al. Can. J. Chem. Eng. 2003, 81, 389-394). As in the work of Monahan and Fox (AIChE J. 2007, 53, 9-18), the complete set of interphase force models includes drag, added-mass, lift, rotation, and strain. The simulation results are presented in the form of comparisons with the experimental data for the time-averaged gas holdup and the instantaneous and time-averaged air and liquid velocity fields. Overall, the qualitative and quantitative comparisons between experiments and simulations are satisfactory for both uniform and nonuniform aeration. In particular, the model predicts the flow patterns observed in the experiments, but in some cases at slightly different values of the amount of aeration. In the latter cases, it is shown that changing the model parameters does not improve the agreement with experiments. However, changing the liquid-velocity boundary condition from zero stress to zero slip leads to a small improvement. The multiphase flow simulated in this work corresponds to the pseudo-2D bubble-column experiments at Delft University of Technology (Harteveld et al. Can. J. Chem. Eng. 2003, 81, 389-394). As in the work of Monahan and Fox (AIChE J. 2007, 53, 9-18), the complete set of interphase force models includes drag, added-mass, lift, rotation, and strain. The simulation results are presented in the form of comparisons with the experimental data for the time-averaged gas holdup and the instantaneous and time-averaged air and liquid velocity fields. Overall, the qualitative and quantitative comparisons between experiments and simulations are satisfactory for both uniform and nonuniform aeration. In particular, the model predicts the flow patterns observed in the experiments, but in some cases at slightly different values of the amount of aeration. In the latter cases, it is shown that changing the model parameters does not improve the agreement with experiments. However, changing the liquid-velocity boundary condition from zero stress to zero slip leads to a small improvement. Disciplines Biological Engineering | Chemical Engineering

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“…The BP model is reported in the literature to play an important role in bubblephase stability [18]. Biesheuvel and Gorissen [19] proposed a bubble pressure model of the form:…”

Section: Bubble Pressure Modelmentioning

confidence: 99%

Stability Issues for Gas-Liquid Flows in Bubble Columns

Law

Battaglia

Heindel

2007

Volume 8: Heat Transfer, Fluid Flows, and Thermal Systems, Parts a and B

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In the present work, gas-liquid flow dynamics in a bubble column are simulated with CFDLib using an Eulerian-Eulerian ensemble-averaging method in a two dimensional Cartesian system. The time-averaged gas holdup simulations are compared to experimental measurements of a cylindrical bubble column performed by Rampure et al. [1]. Numerical predictions are presented for the time-averaged gas holdup at various axial heights as a function of radial position. The effects of grid resolution, bubble pressure model, and drag coefficient models on the numerical predictions are examined. The bubble pressure model is reported to account for bubble stability, thus providing physical solutions. The objectives are to obtain grid-independent numerical solutions to resolve unphysical results observed in FLUENT with increasing grid resolutions [2], and to validate computational fluid dynamics simulations with experimental data to demonstrate the use of numerical simulations as a viable design tool for gas-liquid bubble column flows.

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Void fraction disturbances in a uniform bubbly fluid

Cited by 97 publications

References 14 publications

Fundamentals of Multiphase Flow

Fundamentals of Multiphase Flow

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

Stability Issues for Gas-Liquid Flows in Bubble Columns

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