Bubble swarm characteristics in bubble columns

Kumar, Akhilesh; Degaleesan, T. E.; Laddha, G. S.; Hoelscher, H. E.

doi:10.1002/cjce.5450540604

Cited by 100 publications

(47 citation statements)

References 15 publications

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“…Kumar et al [196] presented the ε G data for air in several liquids and found that their own and the previous investigators' data can be correlated using Equation (11) as a function of the dimensionless gas velocity,…”

Section: Scheme Of Correlations By Lockett and Kirkpatrickmentioning

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: Scheme Of Correlations By Lockett and Kirkpatrickmentioning

confidence: 99%

Two-Phase Bubble Columns: A Comprehensive Review

2018

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“…Both pressure control valve (2) and pressure gauge (4) were used for measuring the pressure drop across the air diffuser. The liquid-film apparatus (LFFA) (9) was installed at the surface water over the air diffuser. The schematic drawing of the LFFA is shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

Study of Liquid Film Forming Apparatus (LFFA) Mechanisms in Terms of Oxygen Transfer and Bubble Hydrodynamic Parameters

Jamnongwong¹,

Charoenpittaya²,

Hongprasith³

et al. 2016

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Abstract. Aeration system is extensively applied in aquaculture and waste water treatment. It provides oxygen for organism living and mixing while consumes colossal amounts of energy for operating. Hence, the improvement of aeration system is not only providing enough oxygen and mixing but also concerning to the energy saving. Liquid film forming apparatus (LFFA) is a simple equipment that itself does not consume any power. It can be installed in existing conventional aeration system without large-scale retrofitting. Laboratory scale experiment was performed in a 190-litre aeration tank. The different types of air diffuser providing different bubble aspects were installed at the bottom of the aeration tank as the conventional diffused aeration systems. The volumetric mass transfer coefficient ( ) of the aeration systems with LFFA are higher than the conventional systems notably. The mechanism of oxygen transfer in LFFA system can be summarized into 4 patterns: 1) Conventional mechanism, 2) Bubble collection mechanism, 3) Bubble recirculation mechanism and 4) Bubble-Liquid Foam mechanism. Then, the interfacial area (a) is improved comparing with the conventional diffused aeration system. The LFFA system should be operated with small bubble diameter generation (< 3 mm). The can be increased 11 -37 % depending on generated bubble size. By determining the additional interfacial area (a+), the bubble collection phenomena, as well as, the proper superficial gas velocity (>0.13 m/s) can be defined and provided a better understanding on oxygen transfer mechanism in LFFA system.

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“…Godbole et al (1984) proposed a correlation for gas holdup prediction in CMC solutions. Most of the works in bubble columns dealing with gas holdup measurement and prediction are based on deep bubble beds (Hughmark, 1967;Akita and Yoshida, 1973;Kumar et al, 1976;Hikita et al, 1980;Kelkar et al, 1983;Behkish et al, 2007). A unique work concerned with gas holdup ε G under homogeneous bubbling conditions was published by Hammer et al (1984).…”

Section: Estimation Of Gas Holdupmentioning

confidence: 99%