Influence of surface active substances on bubble motion and collision with various interfaces

Małysa, K.; Krasowska, Marta; Krzan, Marcel

doi:10.1016/j.cis.2004.08.004

Cited by 207 publications

(141 citation statements)

References 85 publications

Supporting

Mentioning

116

Contrasting

Unclassified

Order By: Relevance

“…Early experiments passed air at a fixed flow-rate through a porous glass disc at the bottom of a glass column [35], and this method (i.e., the Bikerman test) was adopted to assess the stability of dynamic foams under conditions of continuous aeration. Whilst modifications have been made to this test, such as the use of video technology and optical detection to accurately record changes in foam height [36,37] and measuring foam stability through detecting liquid draining rates using conductivity [26,38]; the basic practice that originally formed the Bikerman test is still one of the main procedures used today. One widely-used test, the Rudin test for beer foam quality assessment, measures foam stability using a similar gas bubbling/sparging technique [28].…”

Section: Common Methods Used To Determine Foam Stability and 'Foamabimentioning

confidence: 99%

Evaluating the Measurement of Activated Sludge Foam Potential

Fryer

O’Flaherty

Gray

2011

Water

View full text Add to dashboard Cite

Abstract:The most widely used technique for assessing the propensity of activated sludge to suffer from biological foaming is to measure foam potential. This involves measuring the amount of foam produced from sludge under conditions of controlled aeration. Two approaches have been adopted: (1) Air is passed through specially designed columns from fine porous diffusers at a fixed rate to form uniform sized bubbles or (2) employing Alka-Seltzer ™ tablets which effervesce when added to the sludge. Both tests generate foam formation which can then be quantified. Foam assessment in activated sludge is reviewed. A sintered disc aeration column was compared with the Alka-Seltzer ™ test method and both methods examined under a range of different environmental conditions. Foam potential measured by the sintered disc method displayed better repeatability compared to the Alka-Seltzer test. The use of a wire cage placed over the tablets greatly improved the precision of the Alka-Seltzer test. A positive linear correlation was also found between foam potential and temperature (4-20 °C). Sludge solids concentration was also shown to influence foaming potential making comparisons between reactors problematic. Recommendations on how to improve the repeatability of foam potential measurements are given.

show abstract

Section: Common Methods Used To Determine Foam Stability and 'Foamabimentioning

confidence: 99%

Evaluating the Measurement of Activated Sludge Foam Potential

Fryer

O’Flaherty

Gray

2011

Water

View full text Add to dashboard Cite

show abstract

“…The bubble terminal velocity was calculated as an average for distances, where values of the local bubble velocity started to be constant. The distance of 300 mm was enough for the rising bubble to reach the terminal velocity [11,12].…”

Section: Columns Used To Measure Bubble Velocitymentioning

confidence: 99%

“…The value of the terminal velocity of the bubble depends on the solution concentration. The impact of the surfactant concentration on the profiles of bubble velocities is described in detail elsewhere (e.g., [2,3,[11][12][13][14][15][16][17][18][19][20][21][22]). In short, it depends on the mass transfer rate, molecular orientation and packing at the liquid/gas interface, surface activity and mobility, surface tension gradients, surface viscosity, as well as hydration effects.…”

Section: Terminal Bubble Velocitymentioning

confidence: 99%

“…The PAS setup was described in detail elsewhere [11]. The setup consisted of a basic level of (i) a square glass column (40 mm × 40 mm) with a height of 35 cm; (ii) a glass capillary with an inner diameter of 0.075 mm at the bottom of the column; (iii) a high-speed camera (1000-1024 frames per second); (iv) a high precision pump with a gas-tight syringe; (v) a light source; and (vi) a computer for data processing (Figure 1a).…”

Section: Columns Used To Measure Bubble Velocitymentioning

confidence: 99%

See 1 more Smart Citation

Concentration at the Minimum Bubble Velocity (CMV) for Various Types of Flotation Frothers

2017

View full text Add to dashboard Cite

This paper presents the determination of a concentration at the minimum bubble velocity (CMV) for different types of frothers, such as straight and branched alkyl chain aliphatic alcohols, 1,ω-diols, poly(propylene glycol) and poly(ethylene glycol) alkyl ethers, n-alkyltrimethylammonium bromides, commercial frothers and others. The values of terminal rise bubble velocity were reviewed from the experimental data published in the literature for two different types of columns, i.e., a short PAS (used in Polish Academy of Sciences) of height (35 cm) and a long McGill of height (350 cm). The obtained empirical equation is universal and allows one to rapidly and accurately determine the CMV for all surfactants. The proposed empirical model can also be used to predict the terminal bubble velocity-frother concentration curve by knowing the maximum and minimum terminal velocities, as well as the values of CMV. Assessment and usefulness of frother characterization parameters (i.e., concentration at the minimum bubble velocity (CMV), dynamic frothability index (DFI) and critical coalescence concentration (CCC)) were shown in the flotation of coal.

show abstract

“…The impact of a bubble on a horizontal solid in aqueous solution of surfactants was recently studied (Malysa et al, 2005 and Fujasová-Zedníková et al, 2010). It was found that after an addition of small amount of surfactants, the bubble rebound from horizontal wall is completely suppressed.…”

Section: Introductionmentioning

confidence: 99%