Temperature Dependence of Behavior of Interface Between Molten Sn and LiCl–KCl Eutectic Melt Due to Rising Gas Bubble

Abstract

17The behavior of the interface between molten Sn and the LiCl-KCl eutectic 18 melt system was observed directly. We found that the transient behavior of the interface 19 exhibits considerable temperature dependence through a change in its physical 20 properties. The "metal film" generated in the upper molten-salt phase significantly 21 influences the shape of the interface. Although the lifetime of the metal film depends on 22 the gas flow rate, it is not affected by the buoyancy if the interfacial tension is dominant. Most extractive metallurgical treatments produce a two-liquid-phase system 1 consisting of a metal-rich phase and a less-dense slag phase. The main purpose of such 2 processes is to concentrate the metal phase into a form suitable for further refining and 3 to efficiently remove the gangue materials as a molten slag. Gaseous phases, which are 4 introduced into the liquid metal phase or produced there by reactions, pass through the 5 metal-slag interface. As this happens, the rising gas bubbles might entrain the heavier 6 liquid metal from the bottom layer into the top layer of the lighter molten slag. This 7 will be either desirable or detrimental, depending on the application in question. In bursting in the gas-slag-iron system was investigated using the X-ray transmission 23 technique [13][14][15][16][17]. These studies found two mechanisms for droplet formation, namely, 24 jet entrainment and film entrainment. Nevertheless, in-situ X-ray observations of the 25 dynamic behavior of the molten metal-slag interface have also proven difficult, owing 26 to the extremely limited observation domain. That is to say, the behavior of a 27 three-dimensional bubble cannot be clarified from a two-dimensional image analysis. 28To understand the dynamic behavior of a liquid-liquid-gas interface, direct the Sn-salt interface (t = 0.12 s) and started to disperse, penetrating the upper phase. 16The reason for this could be that, because of the lack of a buoyancy force, the gas

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

“…Thus, the density only has a minor influence on the duration of the film. In a previous paper, 21) the authors mentioned that the film duration time is determined by the surface fluctuation due to interfacial tension and the reduction in the film thickness due to drainage. In the case of SPTS3.0, in spite of the fact that the viscosity becomes relatively large, changes in the film duration time is small.…”

“…19,20) Researchers have investigated the temperature dependence of the detention time of a single bubble passing through the interface between molten Sn and LiCl-KCl eutectic melt. 21) Although these studies have indicated that a slight change in the Eötvös number ( = ΔρgD 2 /σ) influences the interfacial shape considerably even in similar material systems, it is still not well understood as to which properties play a dominant role in determining the column shape and film detention time because so far, it has not been possible to consider the influence of a single physical property. In this study, we employed the sodium polytungstate solution (SPTS)-silicone oil (SO) system to clarify the influence of a linear change in density on the interface deformation in a two-immiscible-liquid system.…”

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

“…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.…”