Experimental study of bubble column hydrodynamics

Magaud, F.; Souhar, M.; Wild, Gabriel; Boisson, Nicolas

doi:10.1016/s0009-2509(01)00110-5

Cited by 47 publications

(24 citation statements)

References 22 publications

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“…In this work the bubble size was between 2 and 4 mm, and bubbles were homogeneously injected, which is analogous to the conditions created by the ring injector in our study. Furthermore, the amplifying effect of decreasing the liquid velocity (Magaud et al 2001;Moursali et al 1995) is also found here: the relative increase in wall shear stress ratio is in the order of 25% for the largest liquid velocity U sl = 1.22 m/s, and in the order of 100% for the smallest velocity U sl = 0.53 m/s. So Fig.…”

Section: Wall Shear Stress Measurementssupporting

confidence: 78%

“…Moursali et al (1995) attribute this effect to the velocity perturbations induced by the bubbles sliding along the wall. However, for larger gas fraction, the shear stress fluctuation rate seems to be independent of e a , which is also observed in the experiments of Magaud et al (2001) and Moursali et al (1995).…”

Section: Wall Shear Stress Measurementssupporting

confidence: 77%

“…3. Using a bubble column, Magaud et al (2001) also showed that the mean wall shear stress was higher in bubbly flow than in single-phase flow. In this work the bubble size was between 2 and 4 mm, and bubbles were homogeneously injected, which is analogous to the conditions created by the ring injector in our study.…”

Section: Wall Shear Stress Measurementsmentioning

confidence: 92%

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Air–water flow in a vertical pipe: experimental study of air bubbles in the vicinity of the wall

et al. 2008

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This study deals with the influence of bubbles on a vertical air-water pipe flow, for gas-lift applications. The effect of changing the bubble size is of particular interest as it has been shown to affect the pressure drop over the pipe. Local measurements on the bubbles characteristics in the wall region were performed, using standard techniques, such as high-speed video recording and optical fibre probe, and more specific techniques, such as two-phase hot film anemometry for the wall shear stress and conductivity measurement for the thickness of the liquid film at the wall. The injection of macroscopic air bubbles in a pipe flow was shown to increase the wall shear stress. Bubbles travelling close to the wall create a periodic perturbation. The injection of small bubbles amplifies this effect, because they tend to move in the wall region; hence, more bubbles are travelling close to the wall. A simple analysis based on a two-fluid set of equations emphasised the importance of the local gas fraction fluctuations on the wall shear stress.

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Section: Wall Shear Stress Measurementssupporting

confidence: 78%

Section: Wall Shear Stress Measurementssupporting

confidence: 77%

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Air–water flow in a vertical pipe: experimental study of air bubbles in the vicinity of the wall

et al. 2008

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“…Optical fibers and impedance probes operate based on the differences in the refractive index or conductivity, respectively, of the liquid and gas phases. Signal fluctuations due to phase changes at the probe tip allow the measurement of local properties; these devices were developed to measure the rise velocities along with the other local properties [337,[365][366][367][368][369][370][371]. When considering the experimental error of the needle probes, two parts should be considered: (a) the statistical error associated with the measuring time (proportional to the square root of the measuring time); (b) the bias error due to the difficulties of piercing a bubble at the bubble edge [372] (viz.…”

Section: The Local Flow Propertiesmentioning

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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“…Optical and impedance probes operate based on the differences in the refractive index or conductivity, respectively, of the liquid and gas phases. In this study, dualtipped optical probes have been used: these devices are capable of simultaneously measuring local holdups, bubble chord lengths and rise velocities (Chabot et al, 1998;Chaumat et al, 2007;Magaud et al, 2001;Moujaes, 1990;Shiea et al, 2013).…”

Section: Introductionmentioning

confidence: 99%