Profiles of local velocities of bubbles in n-butanol, n-hexanol and n-nonanol solutions

Krzan, Marcel; Małysa, K.

doi:10.1016/s0927-7757(02)00163-2

Cited by 74 publications

(62 citation statements)

References 20 publications

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“…With increasing solution concentration the position of the maximum on the local velocity profiles is shifted towards shorter distances, while its height and width are diminishing. Thus, influence of the BSA in solutions of pH = 5.8 was similar to that of typical surfactants (Sam et al 1996;Liao and McLaughlin 2000;Krzan and Malysa 2002;Krzan et al 2004Krzan et al , 2007Malysa et al 2005;. At the highest BSA concentration studied (c = 6 × 10 −7 M) the bubble terminal velocity of ca.…”

Section: Velocity Of the Rising Bubblessupporting

confidence: 57%

“…Stroboscopic illumination of frequency 100 flashes per second was applied in measurements of the bubble local velocity as a function of distance from the capillary. Details of the set-up and measurement procedures have been described in details elsewhere (Krzan and Malysa 2002;Krzan et al 2004Krzan et al , 2007 Foam stability measurements were carried out using the set-up consisting of: a) cylinder glass column of inner diameter of 45 mm with a fritted glass at the bottom, b) syringe pump for supply fixed amount of gas into the solution. Prior the experiments column was carefully filled with 50 ml of the studied solution in such way that no foam was formed.…”

Section: Methodsmentioning

confidence: 99%

“…This gradient of the surface concentration reduces mobility of the bubble interface, due to surface tension gradients induced, and consequently the bubble velocity is lowered. This causes an increase of the hydrodynamic drag and the bubble velocity can be lowered even by over 50%, at adsorption coverage's assuring complete immobilization of the bubble surface fluidity (Krzan and Malysa 2002;Krzan et al 2004Krzan et al , 2007Malysa et al 2005;. It was reported by Ybert and di Meglio (1998) that also in BSA solutions of pH about 5.5 the velocity of the ascending bubbles was strongly reduced compared to the velocity in pure water.…”

Section: Introductionmentioning

confidence: 98%

“…Velocity of the bubbles rising in surfactant solutions is strongly slowed down (Levich 1962;Clift et al 1978;Sam et al 1996;Liao and McLaughlin 2000;Krzan and Malysa 2002;Krzan et al 2004Krzan et al , 2007 due to presence of the adsorption layer at their surfaces. Adsorption layer at the rising bubble surface retards fluidity of the gas/liquid interface and therefore the viscous drag exerted by continuous medium is increased (Levich 1962).…”

Section: Introductionmentioning

confidence: 99%

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Influence of pH of the BSA solutions on velocity of the rising bubbles and stability of the thin liquid films and foams

et al. 2010

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Influence of pH of the BSA solutions on velocity of the rising bubbles, stability of foams, and properties of single foam and wetting films was studied. It was found that the solution pH affected significantly the BSA surface activity and properties of the protein adsorption layer under dynamic and static conditions. At pH close to the isoelectric point (pH IEP = 4.8) the BSA showed the highest surface activity. The equilibrium microscopic foam films of thicknesses of 64-80 nm, depending on the BSA concentration, were obtained at pH = 5.8. Under dynamic conditions the bubble rising velocity was reduced in a highest degree and the foam formed were most stable at the solutions pH-5.8 and 4.8. Lowering the bubble velocity shows that the BSA adsorption layer was formed, which retarded fluidity of the bubble surface. When the solution pH was significantly lower (pH = 3.9) or much higher (pH = 10) than the pH IEP then the BSA practically had no influence on the bubble velocity and the foam stability was drastically reduced. Moreover, the pH variations affected also the time of the threephase contact (TPC) formation on mica surface covered by the BSA adsorption layers. These pH dependent changes in the BSA surface activity indicate that the BSA linear conformers, existing at pH far away from the pH IEP , have much higher affinity to aqueous phase resulting from higher net electrical charge present over the extended BSA molecule conformers.

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Section: Velocity Of the Rising Bubblessupporting

confidence: 57%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of pH of the BSA solutions on velocity of the rising bubbles and stability of the thin liquid films and foams

et al. 2010

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“…The observation of single bubbles shows that a decrease in surface tension (due to surfactant addition) diminishes the bubble coalescence frequency: the bubbles are then smaller, slower (Loubière and Hébrard, 2004;Malysa et al, 2005;Mouza et al, 2005), and also more spherical (Krzan and Malysa, 2002;Byakova et al, 2003;Gnyloskurenko et al, 2003;Mouza et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamics and mass transfer in bubble column: Influence of liquid phase surface tension

Chaumat¹,

Billet²,

Delmas³

2007

Chemical Engineering Science

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Motion and interaction of in‐line bubbles in quiescent non‐aqueous solutions of hydrocarbon resin

Mei,

Luo,

Zhang

et al. 2024

Asia-Pacific J Chem Eng

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Hydrocarbon resin (HR) is an essential fine chemical. The preparation and application process of HR involves lots of gas–liquid heterogeneous reactions, and the bubbly flow behavior influences them significantly. Using high‐speed photography and digital image processing techniques, the motion and interaction of in‐line bubbles in non‐aqueous solutions of HR are examined in this article. The results show a critical gas flow rate that can change the bubbling regime. It can be observed that viscosity features prominently in changing the shape of bubbles and their motion. As the viscosity increases, the bubbles are more prone to coalescence, and the bubble coalescence process gradually changes from connected slip‐rising coalescence to connected‐rising coalescence. The viscosity transition region between non‐coalescent and coalescent systems in non‐aqueous solutions of HR occurs at 3.6–9.2 mPa·s. Further, a force analysis shows that in paired bubbles, the leading bubble can be viewed as an individual bubble unaffected by trailing bubble before the two bubbles collide, but in the wake of the leading bubble, the drag force on the trailing bubble decreases and the added mass force increases.

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Profiles of local velocities of bubbles in n-butanol, n-hexanol and n-nonanol solutions

Cited by 74 publications

References 20 publications

Influence of pH of the BSA solutions on velocity of the rising bubbles and stability of the thin liquid films and foams

Influence of pH of the BSA solutions on velocity of the rising bubbles and stability of the thin liquid films and foams

Hydrodynamics and mass transfer in bubble column: Influence of liquid phase surface tension

Motion and interaction of in‐line bubbles in quiescent non‐aqueous solutions of hydrocarbon resin

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