Rise, bouncing and coalescence of bubbles impacting at a free surface

Suñol, Francesc; González-Cinca, Ricard

doi:10.1016/j.colsurfa.2010.01.032

Cited by 42 publications

(40 citation statements)

References 24 publications

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“…Lehr et al have reported the critical speeds of coalescence do not depend on the sizes of the bubbles in water [73]. Some coalescence studies on bubbles [22,27,34,59] and drops [75] in salt solutions, organic liquids, and viscous aqueous solutions have found an effect of bubble size in their systems.…”

Section: Coalescence Timesmentioning

confidence: 96%

“…This yields stochastic information on the times taken for bubbles to coalesce under more or less well-controlled conditions. Examples include observation of freely rising bubbles in vertical columns with two bubbles rising sideby-side [11][12][13], and a bubble rising to approach the liquid surface [14][15][16][17][18][19][20][21][22] (in this case the air phase above the liquid surface can be considered as an infinitely-large bubble). Some studies have used a bubble contacting device where pairs of bubbles are formed from two adjacent or two directly opposed nozzles [23][24][25][26][27][28][29][30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Inhibition of bubble coalescence: Effects of salt concentration and speed of approach

Castillo¹,

Ohnishi²,

Horn³

2011

Journal of Colloid and Interface Science

100

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Section: Coalescence Timesmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Inhibition of bubble coalescence: Effects of salt concentration and speed of approach

Castillo¹,

Ohnishi²,

Horn³

2011

Journal of Colloid and Interface Science

100

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“…Lubrication and deformation forces can cause a rebound of the bubble prior to film rupture. Advances in high-speed photography allow for very precise measurements of the rise velocity, impact and bounce of bubbles against solid surfaces, 1,2 soft deformable surfaces [3][4][5][6] and also from compound films. 7,8 The liquid film eventually breaks and the bubble bursts through the free surface causing small droplets of the liquid phase to be propelled into the air and smaller bubbles can also form in the liquid phase.…”

Section: Introductionmentioning

confidence: 99%

The impact and bounce of air bubbles at a flat fluid interface

2016

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The rise and impact of bubbles at an initially flat but deformable liquid-air interface in ultraclean liquid systems are modelled by taking into account the buoyancy force, hydrodynamic drag, inertial added mass effect and drainage of the thin film between the bubble and the interface. The bubble-surface interaction is analyzed using lubrication theory that allows for both bubble and surface deformation under a balance of normal stresses and surface tension as well as the long-range nature of deformation along the interface. The quantitative result for collision and bounce is sensitive to the impact velocity of the rising bubble. This velocity is controlled by the combined effects of interfacial tension via the Young-Laplace equation and hydrodynamic stress on the surface, which determine the deformation of the bubble. The drag force that arises from the hydrodynamic stress in turn depends on the hydrodynamic boundary conditions on the bubble surface and its shape. These interrelated factors are accounted for in a consistent manner. The model can predict the rise velocity and shape of millimeter-size bubbles in ultra-clean water, in two silicone oils of different densities and viscosities and in ethanol without any adjustable parameters. The collision and bounce of such bubbles with a flat water/air, silicone oil/air and ethanol/air interface can then be predicted with excellent agreement when compared to experimental observations.

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“…The drop ejection process is related to the second half of droplet rebound and bounce phenomena from super-hydrophobic surfaces (see Richard et al (2002) and de Ruiter et al (2015), and references contained therein) and the drop jump phenomena observed when drops coalesce on hydrophobic surfaces (Farhangi et al, 2012). The inverse problem of bubbles jumping "downward" from flat surfaces in drop tower experiments is also discussed by Wollman et al (2016) with related work pursued by Suñol and González-Cinca (2010). Numerical investigations of the drop jump phenomena are conducted by Zhang et al (2014).…”

Section: Introductionmentioning

confidence: 99%

Puddle jumping: Spontaneous ejection of large liquid droplets from hydrophobic surfaces during drop tower tests

et al. 2016

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Large droplets and puddles jump spontaneously from sufficiently hydrophobic surfaces during routine drop tower tests. The simple low-cost passive mechanism can in turn be used as an experimental device to investigate dynamic droplet phenomena for drops up to 104 times larger than their normal terrestrial counterparts. We provide and/or confirm quick and qualitative design guides for such “drop shooters” as employed in drop tower tests including relationships to predict droplet ejection durations and velocities as functions of drop volume, surface texture, surface contour, wettability pattern, and fluid properties including contact angle. The latter is determined via profile image comparisons with numerical equilibrium interface computations. Water drop volumes of 0.04–400 ml at ejection speeds of −0.007–0.12 m/s are demonstrated herein. A sample application of the drop jump method is made to the classic problem of low-gravity phase change heat transfer for large impinging drops. Many other candidate problems might be identified by the reader.

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Rise, bouncing and coalescence of bubbles impacting at a free surface

Cited by 42 publications

References 24 publications

Inhibition of bubble coalescence: Effects of salt concentration and speed of approach

Inhibition of bubble coalescence: Effects of salt concentration and speed of approach

The impact and bounce of air bubbles at a flat fluid interface

Puddle jumping: Spontaneous ejection of large liquid droplets from hydrophobic surfaces during drop tower tests

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