The coalescence of gas bubbles in dilute aqueous solutions

Sagert, Norman H.; Quinn, Michael J.

doi:10.1016/0009-2509(78)85014-3

Cited by 63 publications

(31 citation statements)

References 8 publications

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“…Coalescence time increased with increase in concentration in all the systems studied by them. However, the coalescence times were less than 1 s in every system studied by Sagert and Quinn (1978). Drogaris and Weiland (1983) have reported similar results on the effect of concentration of alcohols.…”

Section: Introductionsupporting

confidence: 79%

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Binary coalescence of air bubbles in viscous liquids in presence of non‐ionic surfactant

Giribabu

Ghosh

2008

Can J Chem Eng

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Coalescence of air bubbles is important in gas-liquid reactors and food processing operations. Bubbles can be stabilized by using non-ionic surfactants. Binary coalescence of air bubbles in ethylene glycol and aqueous glycerol solutions were studied in this work in presence of Span 80. A novel set-up was developed to study long coalescence times. Coalescence time was observed to follow broad stochastic distributions in all systems. The distributions were fitted with a stochastic model developed earlier. The surface tension of ethylene glycol and glycerol solutions was measured at various concentrations of Span 80. These data were fitted using a surface equation of state derived from the Langmuir isotherm. The effect of surfactant concentration on coalescence time was explained in terms of the surface excess of the surfactant and the repulsive force generated at the air-liquid interface. The results from this work illustrate the stochastic nature of bubble coalescence in viscous liquids. This work also demonstrates how non-ionic surfactants can stabilize bubbles in such liquids.La coalescence des bulles d'air est importante dans les réacteurs gaz-liquide et les opérations de l'industrie alimentaire. Les bulles peuventêtre stabilisées en utilisant des surfactants non ioniques. La coalescence binaire de bulles d'air dans des solutions aqueuses d'éthylène glycol et de glycérol aétéétudiée dans ce travail en présence de Span 80. Un nouveau montage aété mis au point pour caractériser les temps de coalescence longs. Le temps de coalescence aété observé afin de suivre les distributions de modèle stochastique dans tous les systèmes. Les distributions ontété caléesà un modèle stochastique mis au point antérieurement. La tension de surface des solutions d'éthylène glycol et de glycérol á eté mesuréeà différentes concentrations de Span 80. Ces données ontété caléesà l'aide d'uneéquation d'état de surface calculéeà partir de l'isotherme de Langmuir. L'effet de la concentration de surfactant sur le temps de coalescence est expliqué par l'excès de surface du surfactant et la force répulsive crééeà l'interface air-liquide. Les résultats de ce travail illustrent la nature stochastique de la coalescence des bulles dans les liquides visqueux. Ce travail démontreégalement comment les surfactants non ioniques peuvent stabiliser les bulles dans de tels liquides.

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Section: Introductionsupporting

confidence: 79%

“…A review of these works has been presented by Chaudhari and Hofmann (1994). Sagert and Quinn (1978) have studied the effects of ethanol, propanol, butanol, pentanol and hexanol on binary coalescence of nitrogen bubbles. Coalescence time increased with increase in concentration in all the systems studied by them.…”

Section: Introductionmentioning

confidence: 98%

Binary coalescence of air bubbles in viscous liquids in presence of non‐ionic surfactant

Giribabu

Ghosh

2008

Can J Chem Eng

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“…1. The adaptability of the optical probe method to study bubble coalescence in transparent liquids has been verified and is described well in the literature.2) Bubbles were produced through two parallel capillary tubes (15) in a bubble chamber (16), which was a glass vessel with water jacket, 0.036m, i.d. and The two ends of the chamber were sealed with teflon plugs which were inserted by bubble injection tubes and an optical sensor holder tube (SUS 304, 0.006m o.d.)…”

Section: Apparatusmentioning

confidence: 82%

Coalescence behavior of two bubbles in stagnant liquids.

Kim

Lee

1987

J. Chem. Eng. Japan

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Coalescence frequency and lifetimes of thin aqueous films formed between nitrogen bubbles were measured in dilute solutions of sodium lauryl suitate, «-amyl alcohol, and 1-butanol. The bubble pairs were formed on two adjacent capillary tubes by use of a microprocessor-controlled stepping motor, and the coalescence time was determined by an optical sensing method. For low-molecular weight alcohols such as 1-butanol and «-amyl alcohol, the transition concentration decreased with increase of bubbling frequency. But for high-molecular weight surfactants such as sodium lauryl sulfate, it increased with bubbling frequency. Coalescence times increased with solute concentration and also with surface tension gradient.

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“…Also other researchers (4), (5) showed that the electrolytes promote the inhibition of the coalescence between a pair of bubbles which grow quasi-statically on nozzles. Recently, this subject has regained closer attention than ever, and has been discussed from various points of view.…”

Section: Introductionmentioning

confidence: 93%

Single Rising Bubble Motion in Aqueous Solution of Electrolyte

Sato

Aoki

Watanabe

2010

JFST

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Effects of electrolytes on bubble coalescence are investigated experimentally from fluid dynamic point of view. Collisions of a bubble with free surface in two kinds of liquids, namely, ultrapure water and sodium chloride solution, are observed using a high speed camera. It is found that the repetitive number of bubble bounces on a free surface in electrolyte solution is larger than that in ultrapure water when the equivalent bubble radii are the same. This result qualitatively shows that electrolyte works to prevent bubbles from coalescing. It is also revealed that the bubbles can coalesce if their Weber numbers, which are based on the radius of curvature of the front side of the bubble and the approach velocity just before the collision with the free surface, are less than a critical Weber number. Furthermore, the critical Weber number decreases with the increase in the concentration of the electrolyte solutions despite the fluid dynamic characteristics, such as bubble rise velocity and bubble shape, are not affected by the addition of the electrolytes. It is concluded that Weber number is the most important parameter to specify the effects of electrolytes on bubble coalescence.

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The coalescence of gas bubbles in dilute aqueous solutions

Cited by 63 publications

References 8 publications

Binary coalescence of air bubbles in viscous liquids in presence of non‐ionic surfactant

Binary coalescence of air bubbles in viscous liquids in presence of non‐ionic surfactant

Coalescence behavior of two bubbles in stagnant liquids.

Single Rising Bubble Motion in Aqueous Solution of Electrolyte

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