Temperature effect on single bubble rise characteristics in stagnant distilled water

Okawa, Tomio; Tanaka, T.; Kataoka, Isao; Mori, M.

doi:10.1016/s0017-9310(02)00345-9

Cited by 103 publications

(58 citation statements)

References 14 publications

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“…Several attempts have been made in the literature to correlate the aspect ratio to dimensionless parameters (see refs. [219][220][221]): Eo [222,223], We [223][224][225], Tadaki number [217,226], the Mo and the Eo numbers [227] and the Re and the Eo numbers [228]. Unfortunately, most of these correlations were developed for single bubbles/drops, and they may not be suitable for dense bubbly flows, as discussed by Besagni et al [11,53,229].…”

Section: The Bubble Size Distribution and Shapesmentioning

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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Section: The Bubble Size Distribution and Shapesmentioning

confidence: 99%

Two-Phase Bubble Columns: A Comprehensive Review

2018

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“…(Celata et al, 2004;Celata et al, 2006;Celata et al, 2007)). Some authors have used the Eötvös number, Eo (Okawa et al, 2003;Wellek et al, 1966), others adopted the Weber number, We (Moore, 1959;Taylor and Acrivos, 1964;Wellek et al, 1966), while Tadaki and Maeda (Tadaki and Maeda, 1961) used the Tadaki number (Clift et al, 1978). Other authors used more than one dimensional number, i.e.…”

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

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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“…Some authors have used the Eötvös number Eo [68,69], others have adopted the Weber number We [69][70][71], and Tadaki and Maeda [72] used a dimensionless group defined as a function of the Reynolds and Morton numbers that was later named the Tadaki number [73]. Others have used more than one dimensional numbere.g., Bozzano and Dente used both Mo and Eo [74].…”

Section: Aspect Ratio Correlationmentioning

confidence: 99%