The effects of bubble size on microflotation☆

Cassell, E. Alan; Kaufman, Kenneth M.; Matuevic, Egon

doi:10.1016/0043-1354(75)90095-0

Cited by 57 publications

(11 citation statements)

References 14 publications

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“…Indeed, small bubbles facilitate the fixation of a wide range of particles. This finding has been demonstrated in many studies [7] [8] [9].…”

Section: Effect Of Air Flow On the Concentrator Effectsupporting

confidence: 79%

Improvement of the Microalgae Harvest by the “Foaming-Scumming” Function of an Airlift Column

Bongo¹,

Clarice²,

Mbaiguinam³

et al. 2019

OJFD

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The aim of this research work is to valorize the microalgae grown-up in an Airlift column. The system of fluid circulation and mass transfer is based on the principle of interaction between gas bubbles and a liquid. Thus, this study focuses on the phenomenon of the determination of the vacuum rate, the size and the speed of the bubbles including the optimization of microalgae development within the culture process. In addition, this study tries to understand the close relationship between these phenomena, its environment and the microalgae cell. These studies were conducted on the operation of an Airlift column in aquaculture, mainly in freshwater [1]. However, other researchers [2] are interested in studying saline water. In conclusion, a series of experiments were carried out in order to evaluate the profitability of the Microflotation technique, as a method of separation and concentration in microalgae. These results are very interesting since they reveal that the efficiency of the column, for the foaming-skimming function, is greater by working with less significant air injections, which lead to a reduction in energy cost.

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“…Indeed, small bubbles facilitate the fixation of a wide range of particles. This finding has been demonstrated in many studies [7] [8] [9].…”

Section: Effect Of Air Flow On the Concentrator Effectsupporting

confidence: 79%

Improvement of the Microalgae Harvest by the “Foaming-Scumming” Function of an Airlift Column

Bongo¹,

Clarice²,

Mbaiguinam³

et al. 2019

OJFD

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“…The special structure and stability of microbubbles have made them suitable for many applications. Their small size increases the active surface area required to adsorb contaminants in microflotation purposes . Stability under pressure and the ability to act as contrast agents against ultrasound waves have made microbubbles an appropriate candidate for drug delivery and in vivo ultrasonic imaging .…”

Section: Introductionmentioning

confidence: 99%

Viscosity and rheological behavior of microbubbles in capillary tubes

2014

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The viscosity of microbubbles has been measured in capillary tubes. Experiments were conducted in tubes of different diameters and lengths, with a constant microbubble concentration. The effects of bubble void fraction and size distribution on the viscosity of microbubbles were also investigated. Microbubbles demonstrate shear-thinning non-Newtonian behavior. The viscosity of microbubbles decreases with a decrease in tube diameter and bubble void fraction, and with an increase in tube length. Although viscosity changes with tube dimensions, the flow index (n 0 ) is only influenced by the microbubble void fraction. It is also found that bubble size distribution in the range (1-12 mm) used in this study does not affect the viscosity of microbubbles. The data were then used to develop a correlation to predict viscosity of microbubbles, which represents the experimental viscosity data with an absolute average relative deviation less than 1.3%.

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“…However, sizes of bubbles produced in this manner typically exceed 200 pm in radius, and size distributions must be determined photographically or by some other means. For the removal of impurities from water and wastewater by microflotation, small bubbles are produced with frits by the addition of alcohols (frothing agents); e.g., Cassel et al (7). This procedure does permit production of bubbles as small as 25 pm, but the presence of the alcohol introduces a variable that must be considered when interpreting the results and is not a practical approach for producing small bubbles in seawater.…”

Section: Introductionmentioning

confidence: 99%

A Theoretical Model for Bubble Formation at a Frit Surface in a Shear Field

Johnson

Gershey

Cooke

et al. 1982

Separation Science and Technology

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Engineers, meteorologists, and oceanographers all have an interest in the behavior of small air bubbles in water. Studies that are concerned with the separation of dissolved and particulate species, aerosol formation, and oceanic particle production require a means for the generation of large numbers of small bubbles. A device that produces populations of small bubbles (between 15 and 100 p m in radius) with predictable size distributions has been developed and is described. A model based upon an analysis of the form drag on a bubble emerging from a submerged orifice in a shear field successfully predicts the number-size distribution of bubbles produced by the bubble generator.

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The effects of bubble size on microflotation☆

Cited by 57 publications

References 14 publications

Improvement of the Microalgae Harvest by the “Foaming-Scumming” Function of an Airlift Column

Improvement of the Microalgae Harvest by the “Foaming-Scumming” Function of an Airlift Column

Viscosity and rheological behavior of microbubbles in capillary tubes

A Theoretical Model for Bubble Formation at a Frit Surface in a Shear Field

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