Experiments of air bubbles impacting a rigid wall in tap water

Pelletier, Etienne; Béguin, Cédric; Étienne, Stéphane

doi:10.1063/1.4936877

Cited by 4 publications

(4 citation statements)

References 16 publications

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“…Tsao and Koch [13] found that the collision mechanism can be explained by the transition among the kinetic energy, surface energy, and potential energy. Pelletier and Béguin [14] experimentally investigated that, based on the restitution relations, the aspect ratio of a bouncing bubble before a rebound can be predicted after a rebound.…”

Section: Introductionmentioning

confidence: 99%

“…As discussed above, previous research has been devoted to studying the dynamics of bubbles collision with surfaces [14], the directional and continuous transport of bubbles on superhydrophobic plates [19], or isotropic spreading on SALSs [15]; however, to our knowledge, no results aimed at the anisotropic spreading of bubbles on the SALSs have yet been reported. The anisotropic spreading of bubbles on the designated superaerophilic areas may motivate the novel technologies to enhance or reduce the reaction rate, mass, and heat transfer rate in some specific positions and then to improve the equipment performances in mineral flotation, selective aeration, bubble reactors, and so on.…”

Section: Introductionmentioning

confidence: 99%

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Anisotropic Spreading of Bubbles on Superaerophilic Straight Trajectories beneath a Slide in Water

Yang

Chen

et al. 2020

Water

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Although the bubble contacting a uniformly superaerophilic surface has caused concern due to its application potential in various engineering equipment, such as mineral flotation, very little is known about the mechanism of how the bubble spreads on a surface with anisotropic superaerophilicity. To unveil this mystery, we experimentally studied the anisotropic behavior of a bubble (2 mm in diameter) spreading on the superaerophilic straight trajectories (SALTs) of different widths (0.5 mm-5 mm) in water using a high-speed shadowgraphy system. The 1-3 bounces mostly happened as the bubble approached the SALTs before its spreading. It is first observed that the bubble would be split into two highly symmetrical sub-bubbles with similar migration velocity in opposite directions during the anisotropic spreading. Two essential mechanisms are found to be responsible for the anisotropic spreading on the narrow SALTs (W ≤ 2 mm with two subregimes) and the wide SALTs (W ≥ 3 mm with four subregimes). Considering the combined effect of the surface tension effect of SALT and Laplace pressure, a novel model has been developed to predict the contact size r(t) as a function of time. The nice agreement between this model and our experiments reconfirms that the surface tension effect and Laplace pressure prevail over the hydrostatic pressure.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Anisotropic Spreading of Bubbles on Superaerophilic Straight Trajectories beneath a Slide in Water

Yang

Chen

et al. 2020

Water

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“…Due to our focus on small bubbles of a radius less than 1 mm, we only consider either spherical or slightly ellipsoidal shaped bubbles. In terms of the interfacial mobility, the bubble dynamics can be classified into two cases of mobile (or fast bubble) and immobile bubbles (or slow bubbles) [35,51]. If a bubble-liquid interface is contaminated by particulates or surfactants, the interface holds a condition of zero tangential velocity.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, a condition of zero tangential shear stress is applied and as a consequence, a mobile bubble achieves a higher terminal velocity [35]. From a practical point of view, bubbles in tap water are observed to be both mobile and immobile bubbles [51,53]. As a bubble approaches the wall, a thin liquid-film forms between the bubble and the substrate and the surface wettability does not change the bubble dynamics as long as a thin film exists [76].…”

Section: Introductionmentioning

confidence: 99%

Bubble impact on a tilted wall: Removing bacteria using bubbles

et al. 2019

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Dynamics of a bubble impacting and sliding a tilted surface has been investigated through experimental and computational methods. Specifically, shear stress generated on the wall has been calculated and compared with bacterium adhesion force in order to evaluate a potential sanitization function. In experiments, the bubble-wall interaction has been characterized for several different wall angles. We numerically solved a force balance including buoyancy, hydrodynamic inertia & drag, lift and thin film force to determine the bubble motion. Results showed that the shear stress increases with the wall inclination. The maximum shear stress goes up to more than 300 Pa as a single bubble impacts and scrubs a tilted wall. We found that such a high shear stress is attributed to a rapid change in thin film curvature (flipping bubble/water interface) during the bouncing stage. Later, during the sliding stage, a smaller shear stress up to around 45 Pa is generated for a longer period of time. We also showed that the shear stress generated during the bouncing and sliding stages is high enough to remove bacteria from a surface as a potential method for removing bacteria from tilted surfaces. *

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