Passage of a Gas Bubble through a Liquid−Liquid Interface

Kemiha, Mohammed; Olmos, Éric; Fei, Weiyang; Poncin, Souhila; Li, Huai Z.

doi:10.1021/ie061549v

Cited by 37 publications

(32 citation statements)

References 21 publications

(24 reference statements)

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“…15 For example, sillenite Bi 12 TiO 20 and perovskite-like Bi 4 Ti 3 O 12 crystal structures are of particular interest because they are used in photocatalysis to degrade organic pollutants. [16][17][18][19] In addition, they are used in optoelectronic devices because of their photorefractive properties, and their high electro-optical coefficients make them applicable in the field of holographic interferometry. 20 On the other hand, perovskite-like Bi 4 Ti 3 O 12 has been used as a promising material for nonvolatile ferroelectric random access memories (FRAMs) because of its excellent fatigue resistance during repeated polarization reversals with an electric field.…”

Section: Introductionmentioning

confidence: 99%

“…takanabe@kaust.edu.sa electronic structure and band gap, which govern the photoconversion process, have not been well characterized. 17,[30][31][32][33] In the literature, their band gaps remain controversial, as they have been reported whether there is the presence 18,19 or absence 16 of a visible response. Furthermore, important characteristics such as the dielectric constant, charge carrier effective masses, and band edges have not been reported for these materials.…”

Section: Introductionmentioning

confidence: 99%

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Determination of the electronic, dielectric, and optical properties of sillenite Bi12TiO20 and perovskite-like Bi4Ti3O12 materials from hybrid first-principle calculations

Lardhi

Noureldine

Harb

et al. 2016

The Journal of Chemical Physics

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Density functional theory calculation was conducted to determine the optoelectronic properties of bismuth titanate sillenite (Bi12TiO20) and perovskite-like (Bi4Ti3O12) structures. The lattice parameters were experimentally obtained from Rietveld analysis. The density functional perturbation theory approach was used with the standard Perdew–Burke–Ernzerhof functional and screened Coulomb hybrid Heyd–Scuseria–Ernzerhof functional to investigate the electronic structure and absorption coefficient. Both compounds have good carrier transport properties, low effective hole and electron masses, high dielectric constant, and low exciton binding energy.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Determination of the electronic, dielectric, and optical properties of sillenite Bi12TiO20 and perovskite-like Bi4Ti3O12 materials from hybrid first-principle calculations

Lardhi

Noureldine

Harb

et al. 2016

The Journal of Chemical Physics

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“…In addition, parameter a is determined mainly by the bubble size and the value of T decreases with an increase in the bubble size. 28) As is known from Eq. (18), the thickness of the film decreases with an increase in a and T. This implies that when a large gas bubble reaches the interface, it can lift a much larger and thicker metal film and form more metal droplets.…”

Section: (13)mentioning

confidence: 99%

Metal Emulsion in Sn Alloy/oxide System by Bottom Gas Injection

et al. 2017

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A metal emulsion is formed by the passage of gas bubbles through the interface between the metal phase and the slag phase in the steelmaking process. Emulsified metal droplets have great potential to improve the chemical reaction efficiency during motion in bulk slag. Several studies have focused on the formation mechanism of metal droplets and on the influence of the physical properties of the system on this mechanism. In this study, Sn alloy and sodium tetraborate were used to simulate molten steel and slag, respectively. Gas bubbles were introduced from the bottom of a molten metal bath at various gas flow rates. Slag containing metal droplets at the center of the slag phase was sampled, and the metal droplets were extracted by the dissolution of the oxide in a solvent. The number and diameter of the droplets were measured using a digital microscope. Under the same experimental conditions, the number of metal droplets in the oxide system was smaller but their size was larger than those in a previously investigated Sn alloy/chloride system. In both the systems, the total mass of metal droplets formed by a single bubble increased with an increase in the volume of the gas bubble, and when the volume of the gas bubble was small, the total mass of droplets in the oxide system was smaller than that in the chloride system. The sedimentation rate and coefficient in the oxide system were lower than those in the chloride system.

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“…Bubble rise through an interface of two immiscible liquids of different viscosities has been studied in the past by several researchers. [18][19][20] Practically, all phenomena concerning viscosity stratification invariably include density gradient and other factors, which also influence the dynamics. Although, viscosity stratification is expected to play a significant role, with all the factors included, it is impossible to isolate the effect of viscosity stratification from the dynamics of rising bubble.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of rising bubble inside a viscosity-stratified medium

2015

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The rising bubble dynamics in an unconfined quiescent viscosity-stratified medium has been numerically investigated. This is frequently encountered in industrial as well as natural phenomena. In spite of the large number of studies carried out on bubbles and drops, very few studies have examined the influence of viscosity stratification on bubble rise dynamics. To the best of our knowledge, none of them have isolated the effects of viscosity-stratification alone, even though it is known to influence the dynamics extensively, which is the main objective of the present study. By conducting time-dependent simulations, we present a library of bubble shapes in the Galilei and the Eötvös numbers plane. Our results demonstrate some counter-intuitive phenomena for certain range of parameters due to the presence of viscosity stratification in the surrounding fluid. We found that in a linearly increasing viscosity medium, for certain values of parameters, bubble undergoes large deformation by forming an elongated skirt, while the skirt tends to physically separate the wake region from the rest of the surrounding fluid. This peculiar dynamics is attributed to the migration of less viscous fluid that is carried in the wake of the bubble as it rises, and thereby creating an increasingly larger viscosity contrast between the fluid occupied in the wake region and the surrounding fluid, unlike that observed in a constant viscosity medium. It is also observed that the effect of viscosity stratification is qualitatively different for different regimes of the dimensionless parameters. In future, it will be interesting to investigate this problem in three-dimensions.

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Passage of a Gas Bubble through a Liquid−Liquid Interface

Cited by 37 publications

References 21 publications

Determination of the electronic, dielectric, and optical properties of sillenite Bi12TiO20 and perovskite-like Bi4Ti3O12 materials from hybrid first-principle calculations

Determination of the electronic, dielectric, and optical properties of sillenite Bi12TiO20 and perovskite-like Bi4Ti3O12 materials from hybrid first-principle calculations

Metal Emulsion in Sn Alloy/oxide System by Bottom Gas Injection

Dynamics of rising bubble inside a viscosity-stratified medium

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