Experimental study of the bubble size distribution in a pseudo-2D bubble column

Lau, Y.M.; Sujatha, K. Thiruvalluvan; Gaeini, M Mohammadreza; Deen, NG Niels; Kuipers, J.A.M.

doi:10.1016/j.ces.2013.05.024

Cited by 82 publications

(53 citation statements)

References 17 publications

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“…This result agrees with the studies concerning the size of the bubbles and the flow regime transition (Lucas et al, 2003) and the findings of Besagni and Inzoli, (2016b) and Ahmed, 1994;Wongsuchoto et al, 2003). Lau et al (2013b) and Wongsuchoto et al (2003) observed a transition from a unimodal distribution to a bimodal distribution with increasing U G . This change in the distribution of bubble size has been justified with increased coalescence (Lau et al, 2013b) or break-up (Wongsuchoto et al, 2003).…”

Section: Image Analysissupporting

confidence: 82%

“…Additionally, at low holdup, there are problems associated with overlapping: if the holdup exceeds 1%, more than 40% of the bubbles are overlapping in the image (Lecuona et al, 2000;Rodríguez-Rodríguez et al, 2003). Various studies have addressed this problem and have proposed different methods for dealing with overlapping bubbles (Lau et al, 2013b); however, no agreement has been reached, and some approaches may cause a significant reduction of the bubble sample size and an underestimation of the bubble diameter.…”

Section: Introductionmentioning

confidence: 87%

“…Lau et al (2013b) and Wongsuchoto et al (2003) observed a transition from a unimodal distribution to a bimodal distribution with increasing U G . This change in the distribution of bubble size has been justified with increased coalescence (Lau et al, 2013b) or break-up (Wongsuchoto et al, 2003). This may appear to contradict with our results; however, the present configuration (large-diameter bubble column with spider sparger) is different from the cases reported in the literature.…”

Section: Image Analysismentioning

confidence: 99%

“…Nonintrusive measurement techniques are preferred over intrusive methods because the flow conditions are not disturbed, and image analysis is attracting growing attention. Image analysis has been mostly applied to rectangular/small-scale (Lau et al, 2013a(Lau et al, , 2013bZaruba et al, 2005) or medium scale (Schäfer et al, 2002) bubble columns, but there is a lack of studies concerning BSDs in largediameter bubble columns. Furthermore, studies analyzing the bubble size distributions near the sparger are uncommon (Hur et al, 2013), and the influence of the liquid velocity on the bubble shape and bubble size distribution is far from being understood (Besagni and Inzoli, 2016b).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Comprehensive experimental investigation of counter-current bubble column hydrodynamics: Holdup, flow regime transition, bubble size distributions and local flow properties

Besagni

Inzoli

2016

Chemical Engineering Science

117

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Section: Image Analysissupporting

confidence: 82%

Section: Introductionmentioning

confidence: 87%

Section: Image Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Comprehensive experimental investigation of counter-current bubble column hydrodynamics: Holdup, flow regime transition, bubble size distributions and local flow properties

Besagni

Inzoli

2016

Chemical Engineering Science

117

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“…Only projected bubble images could be obtained. This problem is well known and, despite some proposals (Bian et al, 2013;Sahagian and Proussevitch, 1998), a solution is far from being reached and the use of 2D projected images is a common way of processing bubble images (Karn et al, 2015;Lage and Espósito, 1999;Lau et al, 2013aLau et al, , 2013bWongsuchoto et al, 2003). However, the bubble shape data obtained by this approach are considered reliable: the bubble shape information allowed the extrapolation of correlations for the aspect ratio (Besagni, 2016; and flow regime transition criteria .…”

Section: Image Analysis: Uncertaintiesmentioning

confidence: 99%

The dual effect of viscosity on bubble column hydrodynamics

Besagni

Inzoli

Guido

et al. 2017

Chemical Engineering Science

112

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A B S T R A C TSome authors, in the last decades, have observed the dual effect of viscosity on gas holdup and flow regime transition in small-diameter and small-scale bubble columns. This work concerns the experimental investigation of the dual effect of viscosity on gas holdup and flow regime transition as well as bubble size distributions in a large-diameter and large-scale bubble column. The bubble column is 5.3 m in height, has an inner diameter of 0.24 m, and can be operated with gas superficial velocities in the range of 0.004-0.20 m/s. Air was used as the dispersed phase, and various water-monoethylene glycol solutions were employed as the liquid phase. The water-monoethylene glycol solutions that were tested correspond to a viscosity between 0.9 mPa s and 7.97 mPa s, a density between 997.086 kg/m 3 and 1094.801 kg/m 3 , a surface tension between 0.0715 N/m and 0.0502 N/m, and log 10 (Mo) between −10.77 and −6.55 (where Mo is the Morton number). Gas holdup measurements were used to investigate the global fluid dynamics and the flow regime transition between the homogeneous flow regime and the transition flow regime. An image analysis method was used to investigate the bubble size distributions and shapes for different gas superficial velocities, for different solutions of watermonoethylene glycol. In addition, based on the experimental data from the image analysis, a correlation between the bubble equivalent diameter and the bubble aspect ratio was proposed. The dual effect of viscosity, previously verified in smaller bubble columns, was confirmed not only with respect to the gas holdup and flow regime transition, but also for the bubble size distributions. Low viscosities stabilize the homogeneous flow regime and increase the gas holdup, and are characterized by a larger number of small bubbles. Conversely, higher viscosities destabilize the homogeneous flow regime and decrease the gas holdup, and the bubble size distribution moves toward large bubbles. The experimental results suggest that the stabilization/destabilization of the homogeneous regime is related to the changes in the bubble size distributions and a simple approach, based on the lift force, was proposed to explain this relationship. Finally, the experimental results were compared to the dual effect of organic compounds and inorganic compounds: future studies should propose a comprehensive theory to explain all the dual effects observed.

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Hydrodynamics and mass transfer performance of gas–liquid two‐phase flow in a high‐throughput chaotic microreactor

Zhang,

Tong,

Shi

et al. 2024

AIChE Journal

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Microbubbles have been widely applied in various fields. Here, an oscillating feedback microreactor (OFM) was designed to produce microbubbles at high throughput (5–80 mL/min), where the hydrodynamics and mass transfer performance of gas–liquid two‐phase system were investigated. The hydrodynamics results showed that three secondary flows (oscillation, vortex, and feedback) could be effectively generated for inducing chaotic flow in the OFM, and the gas phase could be effectively broken up into small microbubbles. The bubble size was more sensitive to the liquid phase flow rate than the gas phase. Two dimensionless prediction formulas for bubble Sauter size were proposed based on gas–liquid flow ratio and Reynolds number at different liquid flow rates. The mass transfer experiments showed that the volumetric average mass transfer coefficient kLa was 1–3 orders of magnitude higher than those of conventional reactors.

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Experimental study of the bubble size distribution in a pseudo-2D bubble column

Cited by 82 publications

References 17 publications

Comprehensive experimental investigation of counter-current bubble column hydrodynamics: Holdup, flow regime transition, bubble size distributions and local flow properties

Comprehensive experimental investigation of counter-current bubble column hydrodynamics: Holdup, flow regime transition, bubble size distributions and local flow properties

The dual effect of viscosity on bubble column hydrodynamics

Hydrodynamics and mass transfer performance of gas–liquid two‐phase flow in a high‐throughput chaotic microreactor

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