On the modelling of bubbly flow in vertical pipes

Krepper, Eckhard; Lucas, Dirk; Prasser, Horst-Michael

doi:10.1016/j.nucengdes.2004.09.006

Cited by 170 publications

(82 citation statements)

References 13 publications

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“…The model, however, did not implement a population balance model, but rather, a constant bubble equivalent diameter for each group and the non-drag forces were neglected. More recently, Ziegenhein et al [10] used two velocity groups for the gas phase, following the proposal of Krepper et al [488], which has also been used in several studies [430,435,442,444,446,447,458,465,489]-the two velocity groups for the gas phase are computed by slitting the original distributions at the diameter for which the lift coefficient changes its sign. It is worth mentioning the study of Xu et al [483], which compared the above-mentioned approaches and found that the best performances are given by the "inhomogeneous population balance model".…”

Section: The Eulerian Multi-fluid Approachmentioning

confidence: 99%

Two-Phase Bubble Columns: A Comprehensive Review

2018

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We present a comprehensive literature review on the two-phase bubble column; in this review we deeply analyze the flow regimes, the flow regime transitions, the local and global fluid dynamics parameters, and the mass transfer phenomena. First, we discuss the flow regimes, the flow regime transitions, the local and global fluid dynamics parameters, and the mass transfer. We also discuss how the operating parameters (i.e., pressure, temperature, and gas and liquid flow rates), the operating modes (i.e., the co-current, the counter-current and the batch modes), the liquid and gas phase properties, and the design parameters (i.e., gas sparger design, column diameter and aspect ratio) influence the flow regime transitions and the fluid dynamics parameters. Secondly, we present the experimental techniques for studying the global and local fluid dynamic properties. Finally, we present the modeling approaches to study the global and local bubble column fluid dynamics, and we outline the major issues to be solved in future studies.

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Section: The Eulerian Multi-fluid Approachmentioning

confidence: 99%

Two-Phase Bubble Columns: A Comprehensive Review

2018

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“…Contrary to this, recent works have developed hybrid models that effectively couple the TFM with either a population balance model (PBM) or an ITM in an attempt to eliminate the dependency on prior knowledge of the flow regime. The commercial CFD code, CFX for example has implemented an inhomogenous multiple size group (MUSIG) model [145][146][147] that has been reported to capture flow regimes consistent with the work of Taitel, et al [8] on vertical co-current flow.…”

Section: Methodsmentioning

confidence: 99%

“…To cater for this, Krepper, et al [147] looked to use more objective criteria when analysing co-current vertical flows by measuring the bubble size distributions and radial gas volume fraction profiles. This was performed in both their experimental setup and CFD simulations.…”

Section: Methodsmentioning

confidence: 99%

A critical review of flow maps for gas-liquid flows in vertical pipes and annuli

Mitchell

Rufford

et al. 2017

Chemical Engineering Journal

142

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The accurate prediction of two-phase gas and liquid flow regimes is important in the proper design, operation and scale-up of pressure management and fluid handling systems in a wide range of industrial processes. This paper provides a comprehensive review of 3947 published experimental data points for gas-liquid flow maps in vertical pipes and annuli, including a critical analysis of state-of-the-art measurement techniques used to identify bubble, slug, churn and annular flow regimes. We examine the critical factors of pipe geometry (diameters, deviation from vertical), fluid properties and flow conditions that affect the transition from one flow regime to another. The review surveys the theoretical models available to predict flow regime transitions, and we validate the accuracy of these models using the published experimental data. The most reliable flow regime transition models for Moreover, based on the review we provide an outlook on the research needs and important developments in prediction of two-phase flow in vertical pipes including the use of computational fluid dynamics (CFD) techniques to simulate gas-liquid flows in vertical geometries.

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“…In (3), the right-hand terms are the pressure gradient force, the drag force, the added mass force, the shear lift force, the wall lift force, and the buoyant force, respectively. The wall lift force is calculated according to Krepper et al [20]. For the spherical bubble, the added mass force coefficient is V = 0.5.…”

Section: Equations For the Bubble Phasementioning

confidence: 99%

Turbulence Modulation by Small Bubbles in the Vertical Upward Channel Flow

Pang

Wei

2013

Advances in Mechanical Engineering

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The liquid turbulence modulation by small bubbles was investigated detailedly in a vertical upward channel flow with a finite number of small bubbles with the developed Eulerian-Lagrangian method. Small bubbles are treated as pointwise spheres subject to gravity, drag, added mass, pressure gradient, lift, and wall lift forces. The momentum transfer between phases was realized through interphase forces. The present investigation shows that the liquid turbulence is intensified near the wall and is slightly weakened in the channel central region due to the bubble addition. The turbulence modulation mechanisms by bubbles were also analyzed in the paper.

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On the modelling of bubbly flow in vertical pipes

Cited by 170 publications

References 13 publications

Two-Phase Bubble Columns: A Comprehensive Review

Two-Phase Bubble Columns: A Comprehensive Review

A critical review of flow maps for gas-liquid flows in vertical pipes and annuli

Turbulence Modulation by Small Bubbles in the Vertical Upward Channel Flow

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