Turbulence energy distributions in bubbling gas–liquid and gas–liquid–solid flow systems

Cui, Zhe; Fan, Liang‐Shih

doi:10.1016/j.ces.2004.01.031

Cited by 75 publications

(44 citation statements)

References 18 publications

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“…These points will be discussed in section 3.1.4. Other authors also report an increase of the transition velocity while increasing pressure (Chilekar, 2007;Chilekar et al, 2010;Clark, 1990;Cui, 2005 Chilekar et al (2007Chilekar et al ( , 2010 and Krishna et al (1991Krishna et al ( , 1994 report that the increase of gas density is the phenomenon responsible for this increase (effect of pressure on gas holdup in section 3.1.3). Şal et al (2013), Vial et al (2001) and Ohki and Inoue (1970) report an increase of the transition velocity while changing the sparger properties (i.e.…”

Section: Transition Between Homogeneous and Heterogeneous Regimementioning

confidence: 87%

Bubble column reactors for high pressures and high temperatures operation

Leonard

Ferrasse

Boutin

et al. 2015

Chemical Engineering Research and Design

103

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Section: Transition Between Homogeneous and Heterogeneous Regimementioning

confidence: 87%

Bubble column reactors for high pressures and high temperatures operation

Leonard

Ferrasse

Boutin

et al. 2015

Chemical Engineering Research and Design

103

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“…It is generally admitted that-in the homogeneous flow regime-d b increases [156] and, after the transition, "coalescence induced" bubbles appear, whereas the contribution of the "non-coalescence induced" bubbles remain constant [18]. 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.…”

Section: Superficial Gas Velocitymentioning

confidence: 96%

“…An increase in pressure stabilizes the homogeneous flow regime [2,20,56,[84][85][86][87][88][89][90][91][92][93][94][95][96]. Indeed, increasing the pressure increases the break-up rate and reduces the coalescence rate: the new equilibrium between coalescence/break-up leads to a decrease in the bubble size and delays the appearance of large bubbles.…”

Section: Pressure and Temperaturementioning

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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“…(17), β is the gas extinction coefficient and approximately equal to 2 [6], S is the interfacial area per unit volume and z represents distance. As the interfacial area per unit volume is a function of bubble size and bubble number density, this equation shows light intensity as a function of bubble size and bubble number density.…”

Section: Light Transmission Equationmentioning

confidence: 99%