Observation of Interface Deformation in Sodium Polytungstate Solution–Silicone Oil System due to Single Rising Bubble

Natsui, Shungo; Nashimoto, Ryota; Nakajima, Daiki; Kumagai, Toru; Kikuchi, Tatsuya

doi:10.2355/isijinternational.isijint-2016-521

Cited by 4 publications

(3 citation statements)

References 29 publications

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“…The generation efficiency of the marginal regeneration convection cell did not remain constant when the SPT concentration was varied, probably due to the strength of the interaction between the water molecules. At a sufficiently high surfactant concentration, the film thickness at the time of rupture was of the submicron scale, in keeping with a previous report [7], and was not greatly affected by the rising motion of the bubble. especially like to thank Dr. Takehiko Kumagai for valuable discussions on the experimental design of this study.…”

Section: Discussionsupporting

confidence: 91%

“…In contrast to the case during film drainage, the wake of the rising bubble expands the "column" attracted upward by the bubble. The dynamic balance between the buoyancy force and the liquid-liquid interfacial tension determines the thickness of the column [6][7][8]. The height of the column generated by this movement increases steadily until a "neck" is formed, with droplets subsequently generated by rupturing of the neck because of the Plateau-Rayleigh instability.…”

Section: Introductionmentioning

confidence: 99%

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Column and film lifetimes in bubble-induced two-liquid flow

Natsui

Nashimoto²,

Nakajima

et al. 2018

Phys. Rev. E

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We investigated the transient behavior of immiscible two-liquid interfaces initiated by a single rising gas bubble and characterized by liquid "column" and "film" morphologies. To analyze the effect of the buoyancy force, viscosity, and interfacial tension on these morphologies, the single-solution density was controlled continuously by association with the rising velocity of the bubble. It was observed that the extension of the liquid column further into the upper liquid phase owing to the wake flow under the bubble is driven by the buoyancy force, with the velocity decreasing gradually with the distance between the bubble and the liquid-liquid interface. Based on this mechanism, we determined that a strong dimensionless correlation exists between the lifetime of the column and the physical properties of the two liquid phases. On the other hand, gravitational drainage does not affect the film lifetime. However, marginal pinching is dominant, probably owing to the existence of a surface tension gradient between the film and the meniscus.

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Section: Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Column and film lifetimes in bubble-induced two-liquid flow

Natsui

Nashimoto²,

Nakajima

et al. 2018

Phys. Rev. E

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“…water-oil. Also, because it is a very unstable interface, interfacial tension gradient can easily occur there (Appendix 2) 55,56 . For the flow generated at the liquid Me-molten salt interface, the mechanism discussed above is schematically shown in Fig.…”

Section: Discussionmentioning

confidence: 99%

Spontaneous colloidal metal network formation driven by molten salt electrolysis

Natsui

Sudo

Kaneko

et al. 2018

Sci Rep

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The molten salt-based direct reduction process for reactive solid metal outperforms traditional pyrometallurgical methods in energy efficiency. However, the simplity and rapidity of this process require a deeper understanding of the interfacial morphology in the vicinity of liquid metal deposited at the cathode. For the first time, here we report the time change of electrode surface on the sub-millisecond/micrometre scale in molten LiCl-CaCl2 at 823 K. When the potential was applied, liquid Li-Ca alloy droplets grew on the electrode, and the black colloidal metal moved on the electrode surface to form a network structure. The unit cell size of the network and the number density of droplets were found to depend on the applied potential. These results will provide important information about the microscale mixing action near the electrode, and accelerate the development of metallothermic reduction of oxides.

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