Low Frequency Bubble Formation at Horizontal Circular Orifices

Benzing, R. J.; Myers, John E. B.

doi:10.1021/ie50550a022

Cited by 66 publications

(21 citation statements)

References 2 publications

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“…The bubble volume at the moment of release from the nozzle, V b is determined by a balance between the buoyancy force on the one hand and on the other surface tension forces constraining the bubble to the inner diameter of the nozzle, D i . 3,4,7) Hence…”

Section: Introductionmentioning

confidence: 97%

Wettability Effect on Bubble Formation at Nozzles in Liquid Aluminum

Gnyloskurenko

Nakamura

2003

Mater. Trans.

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An experimental study was undertaken to determine how wettability affect the volume and formation of gas bubble at nozzles in liquid aluminum. X-ray fluoroscope was used to carry out in-situ observation in the melt. The nozzles were made of steel, silica and alumina to establish different wettability by liquid aluminum. The frequency of bubble formation and the bubbles volume were investigated for low gas flow rate from 0.43 to 12 cm 3 /s and for various diameters of the nozzle. It was shown that bubble volume increased with wettability worsening both for aqueous and metallic systems. A further insight into the mechanism of the bubble formation was obtained by comparison of the bubble behavior at the tip of the injection devices in liquid aluminum and water.

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Section: Introductionmentioning

confidence: 97%

Wettability Effect on Bubble Formation at Nozzles in Liquid Aluminum

Gnyloskurenko

Nakamura

2003

Mater. Trans.

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“…, to departure which would result in a reduction of bubble departure volume [82][83]126]. However a few other studies reported that there is no effect of surface tension on bubble departure volume [80,91], whereas others showed that the bubble departure volume increased with the decrease of surface tension [127].…”

Section: Resultsmentioning

confidence: 99%

“…increased with liquid viscosity [79][80], (b) had a very weak connection with the viscosity [81], (c) was independent of liquid viscosity [82][83][84]71] and (d) was independent of the liquid viscosity for low viscosities while at higher viscosities, the departure bubble size increased with viscosity, but at small flow rates [85].…”

Section: Dynamics Of Bubble Growthmentioning

confidence: 99%

Modification of the Young–Laplace equation and prediction of bubble interface in the presence of nanoparticles

Vafaei

Wen

2015

Advances in Colloid and Interface Science

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Abstract:Bubbles are fundamental to our daily life and have wide applications such as in the chemical and petrochemical industry, pharmaceutical engineering, mineral processing and colloids engineering. This paper reviews the existing theoretical and experimental bubble studies, with a special focus on the dynamics of triple line and the influence of nanoparticles on the bubble growth and departure process. Nanoparticles are found to influence significantly the effective interfacial properties and the dynamics of triple line, whose effects are dependent on the particle morphology and their interaction with the substrate. While the Young-Laplace equation is widely applied to predict the bubble shape, its application is limited under highly non-equilibrium conditions. Using gold nanoparticle as an example, new experimental study is conducted to reveal the particle concentration influence on the behaviour of triple line and bubble dynamics. A new method is developed to predict the bubble shape when the interfacial equilibrium conditions cannot be met, such as during the oscillation period. The method is used to calculate the pressure difference between the gas and liquid phase, which is shown to oscillate across the liquid-gas interface and is responsible for the interface fluctuation. The comparison of the theoretical study with the experimental data shows a very good agreement, which suggests its potential application to predict bubble shape during non-equilibrium conditions.

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“…The vertical component of surface tension force depends on the liquid-gas surface tension, contact angle and radius of the triple line. It has reported that as the gas-liquid surface tension reduces, the downward surface tension force decreases, which requires less buoyancy force for departure and resulting reduction of bubble departure volume [32][33][34]. However a few other studies reported that there is no effect of surface tension on bubble departure volume [35,36], whereas others showed that the bubble departure volume increased with the decrease of surface tension as bubbles were allowed to grow further into liquid [37].…”

Section: Resultsmentioning

confidence: 99%