Bubble Sizes in Electrolyte and Alcohol Solutions in a Turbulent Stirred Vessel

Machoň, Václav; Pacek, Andrzej W.; Nienow, Alvin W.

doi:10.1205/026387697523651

Cited by 105 publications

(73 citation statements)

References 23 publications

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“…Keitel et al [270] found that the BSD shifts toward lower diameters when employing non-coalescing solutions. This was also observed by Shah et al [161] (ethanol-water mixtures) and by Machon et al [271], who observed a dependency on the active compound concentration. They found that, depending on the mixture concentration, the bubble diameter in water is much higher than in electrolyte and alcohol solutions (c > c t ) or, if c ≈ c t , the diameter is midway between the one in water and the one for c > c t .…”

Section: Active Compoundssupporting

confidence: 77%

See 1 more Smart Citation

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: Active Compoundssupporting

confidence: 77%

“…When using active compounds, the bubble size distribution changes because of coalescence suppression, and a decrease in d b is expected (along with an increase in ε G ) [8,38,56,80,108,127,149,161,234,241,253,270,271]. Among the broader literature on the topic, we present some examples for the sake of clearness.…”

Section: Active Compoundsmentioning

confidence: 99%

Two-Phase Bubble Columns: A Comprehensive Review

2018

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“…The main emphasis of investigations employing this technique is to determine the bubble breakup due to the industrial applications of stirred tanks for multiphase processing. Due to difficulties quantifying turbulence intensities throughout the system, little work has been carried out using this experimental technique for studying bubble coalescence (Alves et al, 2002;Machon et al, 1997). Cho and Laskowski (2002) to characterize the effect of different salts on froth stability.…”

Section: Stirred Tankmentioning

confidence: 99%

Drainage and stability of foam films during bubble coalescence in aqueous salt solutions

Firouzi¹

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Bubble coalescence and thin liquid films (TLFs) between bubbles known as foam films, are central to many daily activities, both natural and industrial. They govern a number of important processes such as foam fractionation, oil recovery from tar sands and mineral recovery by flotation using air bubbles. TLFs are known to be stabilized by some salts and bubble coalescence in saline water can be inhibited at salt concentrations above a critical (transition) concentration. However, the mechanisms of the inhibiting effect of these salts are as yet contentious. The aim of this work is to characterise the behaviour of saline liquid films both experimentally and theoretically to better understand the mechanisms.The effect of sodium halide and alkali metal salts including NaF, NaBr, NaI, NaCl, KCl and LiCl on the stability of a foam film was investigated by applying the TLF interferometry method. To mimic realistic conditions of bubble coalescence in separation processes, the drainage and stability of TLFs were studied under non-zero bubble (air-liquid interface) approach speeds (10-300 µm/s) utilizing a nano-pump. For each of the salts studied, a critical concentration (Ccr) above which liquid films lasted for up to 50 s depending on the salt type, concentration and the interface approach speed, was determined. For concentrations below Ccr, the saline liquid films either ruptured instantly or lasted for less than 0.2 s. Ccr follows the order NaF

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“…Numerous studies have been conducted on the effect of electrolytes on bubble size (Barigou et al, 1992;Machon et al, 1997) and on the effect of electrolyte type on bubble coalescence frequency ( (Craig et al, ]993; Deschenes et al, 1998;Pashley et al, 1997). (Only few experimental studies paid attention to the effect of electrolytes on kLa values (Linek et al, 1988;van 't Riet, 1979)).…”

Section: Ionic Strength Of the Slurrymentioning

confidence: 99%

“…Either the difference was estimated to be not significant (viscosity and oxygen adsorption), or the difference was not presumed to cause an improvement in the oxygen transfer rate (surface tension (Craig et al, 1993;Machon et al, 1997), hydrophobicity (Siegel et al, 1988;van Weert et al, 1995) and zeta potential). The following parameters were identified as possibly or presumably related to the enhanced kLa values and their influence on kLa was experimentally investigated:…”

Section: Introductionmentioning

confidence: 99%