Transverse migration of single bubbles in simple shear flows

Tomiyama, Akio; Tamai, Hidesada; Žun, Iztok; Hosokawa, Shigeo

doi:10.1016/s0009-2509(02)00085-4

Cited by 880 publications

(555 citation statements)

References 11 publications

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“…This is also confirmed by the DNS studies by Lu et al (Lu et al, 2006), Tryggvason, 2007, 2013) and Santarelli and Fröhlich (Santarelli and Fröhlich, 2016). To account for this dependency, the lift coefficient according to Tomiyama et al (Tomiyama et al, 2002) is given as:…”

Section: The Lift Force Approachsupporting

confidence: 57%

“…The significance of the bubble shape is clear if we consider the heat and mass transfer at the interface and the closures in computational fluid dynamics. For example, (i) the drag force models needs to contain the information about the bubble shape; (ii) the lift force seems to be influenced by the aspect ratio (Tomiyama et al, 2002). Summarizing, the aspect ratio is a basic parameter for modeling and understanding bubbly flows.…”

Section: Influence Of Viscosity On the Bubble Size Distributions And mentioning

confidence: 99%

“…For this reason, the direction of the lift force depends upon the bubble size and shape. For "small bubbles", the lift force acts in the direction of decreasing liquid velocity (i.e., in case of a batch or co-current mode in the direction toward the pipe wall), while for "large bubbles" it changes direction (a force that can be assimilated to the lift force, which tends to push large and deformed bubbles towards the center of the column (Lucas et al, 2005;Tomiyama et al, 2002)). In the counter-current mode, the behavior (supposing that the maximum downward velocity of the liquid is in the center of the column) is the opposite: the "small bubbles" migrate toward the center of the column.…”

Section: The Lift Force Approachmentioning

confidence: 99%

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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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Section: The Lift Force Approachsupporting

confidence: 57%

Section: Influence Of Viscosity On the Bubble Size Distributions And mentioning

confidence: 99%

Section: The Lift Force Approachmentioning

confidence: 99%

See 1 more Smart Citation

The dual effect of viscosity on bubble column hydrodynamics

Besagni

Inzoli

Guido

et al. 2017

Chemical Engineering Science

112

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“…For "small bubbles", the lift force acts in the direction of decreasing liquid velocity (i.e. batch or co-current mode, thus, the lift force pushes the small bubbles toward the wall), whilst for "large bubbles" it changes direction (a force that can be assimilated to the lift force tends to push large and deformed bubbles towards the center of the column (Lucas et al, 2005;Tomiyama et al, 2002)). This is also confirmed by the DNS studies of Santarelli and Fröhlich (2016).…”

Section: Image Analysismentioning

confidence: 99%

“…As a result, correlations for the lift coefficient usually display a change of sign from negative for "small diameter" (d eq o 5.8 mm for air-water at ambient condition) to positive for "large bubbles" (d eq 4 5.8 mm for air-water at ambient condition). The change of sign of the lift coefficient is well described using the model of Tomiyama et al (2002).…”

Section: Image Analysismentioning

confidence: 99%

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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Bubble Columns

Deen

Mudde

Kuipers

et al. 2010

Ullmann's Encyclopedia of Industrial Chemistry

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The article contains sections titled: 1. Introduction 2. Bubble Columns 2.1. Design and Applications 2.2. Gas Distribution 2.3. Flow Regimes 2.4. Bubble Size 2.5. Bubble Rise Velocity 2.6. Axial Dispersion 2.7. Gas Holdup 2.8. Specific Interfacial Area 2.9. Mass Transfer 2.10. Heat Transfer 2.11. Fluid Dynamics 3. Airlift Loop Reactors 3.1. Design and Applications 3.2. Mixing Behavior and Fluid Dynamics 3.3. Gas Holdup 3.4. Mass Transfer and Mixing 3.5. Heat Transfer 3.6. Computational Fluid Dynamics

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Transverse migration of single bubbles in simple shear flows

Cited by 880 publications

References 11 publications

The dual effect of viscosity on bubble column hydrodynamics

The dual effect of viscosity on bubble column hydrodynamics

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

Bubble Columns

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