A comparison between capillary and imaging techniques for sizing bubbles in flotation systems

Hernandez-Aguilar, Jose R.; Coleman, R.G; Gómez, C.O.; Finch, J.A.

doi:10.1016/j.mineng.2003.09.011

Cited by 87 publications

(26 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…6(a)) having two peaks: the first one at the low diameter d eq ¼ 0.5-1 mm and the second one at d eq ¼ 3-3.5 mm. Such a bimodal distribution has been noticed in other studies from the literature [28,[51][52][53]. The Sauter mean bubble diameter is (Eq.…”

Section: Flow Regimes Description and Discussionsupporting

confidence: 72%

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

Besagni

Guédon

Inzoli

2015

Journal of Fluids Engineering

View full text Add to dashboard Cite

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.

show abstract

Section: Flow Regimes Description and Discussionsupporting

confidence: 72%

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

Besagni

Guédon

Inzoli

2015

Journal of Fluids Engineering

View full text Add to dashboard Cite

show abstract

“…In particular, the first peak of frequency moves from 0.5-1 mm toward 1-1.5 mm and the second peak of frequency moves from 3-3.5 mm toward 4.5-5 mm. A bimodal distribution has also been found in the literature [21,41,64,65]. In particular, Lau et al [21] and Wongsuchoto et al [41] observed a transition from unimodal distribution to bimodal distribution with increasing superficial velocity of the air.…”

Section: Bubble Size Distributionssupporting

confidence: 54%

Bubble size distributions and shapes in annular gap bubble column

Besagni

Inzoli

2016

Experimental Thermal and Fluid Science

116

View full text Add to dashboard Cite

“…Some authors reported an increase in d b with superficial gas velocity, both in the homogeneous and heterogeneous flow regimes [35,38,85,87,127,183,[232][233][234][235][236][237][238][239], while other authors reported no effect of U G over d b [188,240] and some others reported a decrease in the bubble size [241]. In the literature, both unimodal [239] and bimodal [242][243][244][245] BSD have been found depending on the gas sparger design and operating conditions. Lau et al [242] and Wongsuchoto et al [244] observed a transition from unimodal BSD to bimodal BSD with increasing superficial velocity of the air.…”

Section: Superficial Gas Velocitymentioning

confidence: 99%

Two-Phase Bubble Columns: A Comprehensive Review

2018

View full text Add to dashboard Cite

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.

show abstract

A comparison between capillary and imaging techniques for sizing bubbles in flotation systems

Cited by 87 publications

References 8 publications

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

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

Bubble size distributions and shapes in annular gap bubble column

Two-Phase Bubble Columns: A Comprehensive Review

Contact Info

Product

Resources

About