Elasticity in Bubble Rupture

Tammaro, Daniele; Pasquino, Rossana; Villone, Massimiliano M.; D’Avino, Gaetano; Ferraro, V. C. A.; Maio, Ernesto Di; Langella, A.; Grizzuti, Nino; Maffettone, Pier Luca

doi:10.1021/acs.langmuir.8b00520

Cited by 25 publications

(30 citation statements)

References 41 publications

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“…The reason for coalescence is not yet known other than in aqueous foams, where owing to capillary forces and gravity induces drainage, i.e., flow of liquid out of the films, films become thinner and eventually the film-stabilising disjoining forces stemming from electrostatic forces of the polar surfactant molecules are overcome 19–22 . The actual rupture process has been observed using fast optical filming and reveals an instability occurring in the middle of a circular film and subsequent rapid spreading 23–25 .…”

Section: Resultsmentioning

confidence: 99%

Using X-ray tomoscopy to explore the dynamics of foaming metal

et al. 2019

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The complex flow of liquid metal in evolving metallic foams is still poorly understood due to difficulties in studying hot and opaque systems. We apply X-ray tomoscopy –the continuous acquisition of tomographic (3D) images– to clarify key dynamic phenomena in liquid aluminium foam such as nucleation and growth, bubble rearrangements, liquid retraction, coalescence and the rupture of films. Each phenomenon takes place on a typical timescale which we cover by obtaining 208 full tomograms per second over a period of up to one minute. An additional data processing algorithm provides information on the 1 ms scale. Here we show that bubble coalescence is not only caused by gravity-induced drainage, as experiments under weightlessness show, and by stresses caused by foam growth, but also by local pressure peaks caused by the blowing agent. Moreover, details of foam expansion and phenomena such as rupture cascades and film thinning before rupture are quantified. These findings allow us to propose a way to obtain foams with smaller and more equally sized bubbles.

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Section: Resultsmentioning

confidence: 99%

Using X-ray tomoscopy to explore the dynamics of foaming metal

et al. 2019

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“…As a model system, we studied the temporal evolution of the thickness profile of bubbles formed from a film made of an aqueous solution of maple syrup and 0.05 wt% of polyacrylamide (PA). The bubbles were inflated by pumping air from the side inlet of the pipe at a flow rate φ = 0.015 mL/s 25 . DH in off-axis geometry is based on the classic holography principle, with the difference being that the hologram recording is performed by a digital camera and transmitted to a computer, and the subsequent reconstruction of the holographic image is carried out numerically, see Figure S1d-g.…”

Section: Holographic Thickness Mapping For Liquid Filmsmentioning

confidence: 99%

“…It can have very different dynamics, depending on the particular fluid or conditions of breakage 31 . One important parameter is the thickness of the opening rim and the possible presence of fluid droplets escaping from the film 25,32 .…”

Section: High-speed Holographic Imagingmentioning

confidence: 99%

Quantitative imaging of the complexity in liquid bubbles’ evolution reveals the dynamics of film retraction

et al. 2019

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The dynamics and stability of thin liquid films have fascinated scientists over many decades. Thin film flows are central to numerous areas of engineering, geophysics, and biophysics and occur over a wide range of lengths, velocities, and liquid property scales. In spite of many significant developments in this area, we still lack appropriate quantitative experimental tools with the spatial and temporal resolution necessary for a comprehensive study of film evolution. We propose tackling this problem with a holographic technique that combines quantitative phase imaging with a custom setup designed to form and manipulate bubbles. The results, gathered on a model aqueous polymeric solution, provide unparalleled insight into bubble dynamics through the combination of a full-field thickness estimation, three-dimensional imaging, and a fast acquisition time. The unprecedented level of detail offered by the proposed methodology will promote a deeper understanding of the underlying physics of thin film dynamics.

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“…In order to identify the role of viscoelasticity in the retraction velocity of liquid filaments, a simplified theoretical model is proposed. The retraction dynamics of viscoelastic liquid films has been studied in other geometries (Evers, Shulepov & Frens 1997;Dalnoki-Veress et al 1999;Villone et al 2017;Tammaro et al 2018;Villone, Hulsen & Maffettone 2019), but not for a slender liquid filament. We follow the lines of Pierson et al (2020) for Newtonian liquid filaments, but now account for the viscoelasticity due to the polymers.…”

Section: Filament Retraction: Theoretical Modelmentioning

confidence: 99%

The retraction of jetted slender viscoelastic liquid filaments

et al. 2021

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Long and slender liquid filaments are produced during inkjet printing, which can subsequently either retract to form a single droplet, or break up to form a primary droplet and one or more satellite droplets. These satellite droplets are undesirable since they degrade the quality and reproducibility of the print, and lead to contamination within the enclosure of the print device. Existing strategies for the suppression of satellite droplet formation include, among others, adding viscoelasticity to the ink. In the present work, we aim to improve the understanding of the role of viscoelasticity in suppressing satellite droplets in inkjet printing. We demonstrate that very dilute viscoelastic aqueous solutions ( $\text {concentrations} \sim 0.003\,\%$ wt. polyethylene oxide, corresponding to nozzle Deborah number $De_{n}\sim 3$ ) can suppress satellite droplet formation. Furthermore, we show that, for a given driving condition, upper and lower bounds of polymer concentration exist, within which satellite droplets are suppressed. Satellite droplets are formed at concentrations below the lower bound, while jetting ceases for concentrations above the upper bound (for fixed driving conditions). Moreover, we observe that, with concentrations in between the two bounds, the filaments retract at velocities larger than the corresponding Taylor–Culick velocity for the Newtonian case. We show that this enhanced retraction velocity can be attributed to the elastic tension due to polymer stretching, which builds up during the initial jetting phase. These results shed some light on the complex interplay between inertia, capillarity and viscoelasticity for retracting liquid filaments, which is important for the stability and quality of inkjet printing of polymer solutions.

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Elasticity in Bubble Rupture

Cited by 25 publications

References 41 publications

Using X-ray tomoscopy to explore the dynamics of foaming metal

Using X-ray tomoscopy to explore the dynamics of foaming metal

Quantitative imaging of the complexity in liquid bubbles’ evolution reveals the dynamics of film retraction

The retraction of jetted slender viscoelastic liquid filaments

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