A Review on Flow Regime Transition in Bubble Columns

Shaikh, Ashfaq; Al‐Dahhan, Muthanna H.

doi:10.2202/1542-6580.1368

Cited by 112 publications

(89 citation statements)

References 100 publications

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“…The interested reader may also refer to the discussion proposed by Lott et al [99] concerning this instability. Also, the temperature seems to have a stabilizing effect over the homogeneous flow regime [78,100,101] due to the formation of small bubbles [1,2,101,102]. The combined effect of pressure and temperature was studied by Lin et al [101] (p c = 0.1-15.2 MPa, T c = 298-350 K) showing a stabilization of the homogeneous flow regime; it can be stated that many industrial processes may be run in the pseudo-homogeneous flow regimes.…”

Section: Pressure and Temperaturementioning

confidence: 99%

“…Different methods have been presented over the last few decades, as discussed by Shaikh and Al-Dahhan [102], Nedeltchev and Shaikh [26] and Nedeltchev [27]. The most common methods employed are statistical methods (by interpretation of the ε G -U G curve), the swarm velocity [7,11,34,46,[51][52][53]75,76,89,91,229,315,316] and the drift flux [7,11,34,38,46,51,53,75,76,229,[316][317][318] approaches.…”

Section: The Flow Regimesmentioning

confidence: 99%

See 1 more Smart Citation

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: Pressure and Temperaturementioning

confidence: 99%

Section: The Flow Regimesmentioning

confidence: 99%

Two-Phase Bubble Columns: A Comprehensive Review

2018

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“…4.5). In the homogenous regime of a bubble column, the coalescence and breakup can be neglected [49]. Moreover, two or three velocity classes can describe the main effects of the bubbly flow, as suggested in Ref.…”

Section: Turbulence Modelingmentioning

confidence: 99%

Annular Gap Bubble Column: Experimental Investigation and Computational Fluid Dynamics Modeling

Besagni

Guédon

Inzoli

2015

Journal of Fluids Engineering

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This paper investigates the countercurrent gas-liquid flow in an annular gap bubble column with a 0.24 m inner diameter by using experimental and numerical investigations. The two-phase flow is studied experimentally using flow visualizations, gas holdup measurements, and double fiber optical probes in the following range of operating conditions: superficial air velocities up to 0.23 m/s and superficial water velocities up to À0.11 m/s, corresponding to gas holdups up to 29%. The flow visualizations were used to observe the flow patterns and to obtain the bubble size distribution (BSD). The gas holdup measurements were used for investigating the flow regime transitions, and the double fiber optical probes were used to study the local flow phenomena. A computational fluid dynamics (CFD) Eulerian two-fluid modeling of the column operating in the bubbly flow regime is proposed using the commercial software ANSYS FLUENT. The three-dimensional (3D) transient simulations have been performed considering a set of nondrag forces and polydispersity. It is shown that the errors in the global holdup and in the local properties are below 7% and 16%, respectively, in the range considered.

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“…The other method used by Kim et al [16,17], Shaikh and AlDahhan [18], and Begovich and Waston [19] to find the holdup was adopted. The theoretical basis of this method is that under the steadystate conditions, the total axial pressure gradients of any cross section in the column represents the total weight of the bed consisting of the three phases per unit volume Equation (2).…”

Section: Measurement Of Phase Holdupmentioning

confidence: 99%

Hydrodynamic Characteristic of Three-Phase (Liquid-Liquid-Solid) Fluidized Beds

Mohammed¹,

Sulaymon²,

Abdul-Rahmun³

2014

J Chem Eng Process Technol

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This work aims to study the hydrodynamic characteristic of three-phase fluidized beds (water, kerosene, spherical plastic or cylindrical PVC particles). The hydrodynamic parameters were investigated ( phase hold-up, droplet diameter, droplet rising velocity, particle types and sizes, holes diameter of the liquid distributor, continuous and dispersed phase velocities. The experimental work was carried out using QVF glass 0.106 m I.D. and 2 m height. Three distributors with whole diameters (2.5, 5, 7 mm) were used. Plastic particles with diameters (8, 15 mm) and PVC particles (3.34 mm) were used as a solid phase. Two methods (quick, closing valves and pressure drop method) were used to measure the continuous, dispersed and solid hold-up. A cine camera was used to measure the droplet diameter and rising velocity. It was found that the droplet diameter and rising velocity increase with increasing superficial continuous and dispersed velocities. A relationships between the dispersed phase hold-up, droplet diameter and rising velocity with continuous and dispersed superficial velocities respectively were obtained Dimensionless correlation for the prediction of the droplet rising velocity was developed. Keywords:

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A Review on Flow Regime Transition in Bubble Columns

Cited by 112 publications

References 100 publications

Two-Phase Bubble Columns: A Comprehensive Review

Two-Phase Bubble Columns: A Comprehensive Review

Annular Gap Bubble Column: Experimental Investigation and Computational Fluid Dynamics Modeling

Hydrodynamic Characteristic of Three-Phase (Liquid-Liquid-Solid) Fluidized Beds

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