Interfacial phenomena, metals processing and properties

Mukai, Kusuhiro

doi:10.1533/9781845690946.1.237

Cited by 6 publications

(3 citation statements)

References 32 publications

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“…On top of that, at least three remaining questions need to be further investigated: (1) how a faster separation can be achieved by tailoring the inclusions. Specifically, a study on influential factors related to the wetting behavior of particles such as surface texture (roughness and particle morphology), surface chemistry, and hydrodynamic conditions (Good, 1992;Mukai, 2005;Chau et al, 2009) could be an important topic; (2) if a Marangoni-induced flow by particle dissolution further enhances particle separation (Orino et al, 1984;Mukai, 2005;Park et al, 2009); ( 3) what the critical condition of re-entrainment is for inclusions not separated enough. The interfacial turbulence might be responsible for this (Cleaver and Yates, 1973).…”

Section: Discussionmentioning

confidence: 99%

Numerical investigation of particle motion at the steel—slag interface in continuous casting using VOF method and dynamic overset grids

Zhang

Pirker

Saeedipour

2022

Exp. Comput. Multiph. Flow

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The capillary interactions are prominent for a micro-sized particle at the steel—slag interface. In this study, the dynamics of a spherical particle interacting with the steel—slag interface is numerically investigated using the volume of fluid method in combination with the overset grid technique to account for particle motion. The simulations have shown the particle’s separation process at the interface and successfully captured the formation and continuous evolution of a meniscus in the course of particle motion. A sensitivity analysis on the effect of different physical parameters in the steel—slag—particle system is also conducted. The result indicates that the wettability of particle with the slag phase is the main factor affecting particle separation behavior (trapped at the interface or fully separated into slag). Higher interfacial tension of fluid interface and smaller particle size can speed up the particle motion but have less effect on the equilibrium position for particle staying at the interface. In comparison, particle density shows a minor influence when the motion is dominated by the capillary effect. By taking account of the effect of meniscus and capillary forces on a particle, this study provides a more accurate simulation of particle motion in the vicinity of the steel—slag interface and enables further investigation of more complex situations.

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Section: Discussionmentioning

confidence: 99%

Numerical investigation of particle motion at the steel—slag interface in continuous casting using VOF method and dynamic overset grids

Zhang

Pirker

Saeedipour

2022

Exp. Comput. Multiph. Flow

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“…Interfacial phenomena are of fundamental importance for iron and steelmaking applications, since they have significant effect on the mass transfer and fluid dynamics and hence on the diverse reactions occurring across the interfaces . For decades, the importance of interfacial phenomena has been demonstrated by numerous researchers in this field. − Detailed knowledge of those interfacial phenomena and the involved physical properties of slags is constantly accumulating, and there is a demand for reliable experimental data, including the interfacial and surface tension of the melt phases in pyrometallurgical processes …”

Section: Introductionmentioning

confidence: 99%

Novel High-Temperature Experimental Setup to Study Dynamic Surface Tension Phenomena in Oxide Melts

Wegener

Muhmood

Sun

et al. 2013

Ind. Eng. Chem. Res.

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In many pyrometallurgical applications, subprocesses such as emulsification, droplet, bubble or jet formation, coalescence, and surfactant adsorption occur at small time scales (typically milliseconds to fractions of seconds), both at slag/metal and slag/gas interfaces. These phenomena are surface tension driven anddue to the high-temperature environmentvery difficult to investigate in a quantitative manner. Under these dynamic conditions, the instantaneous surface tension of slags may vary in time as well as along its surface and may change dramatically the rate of the involved processes. This paper presents a new high-temperature experimental setup to study and measure the dynamic surface tension of slags, the mechanisms of slag jet and droplet formation, and the capillary breakup of molten slag jets. It features a three zone furnace with optical access, and a droplet generation device incorporating a back-pressure system in combination with a stopper for precise slag flow control. The first successful results of controlled formation of calcia/alumina droplets and coherent jets in an argon environment are discussed. Various time-dependent phenomena such as droplet formation and elongation, necking, breakup, oscillation, satellite formation, and jet disintegration were investigated and quantified using a high-speed camera system. A dynamic pendant drop method was applied to determine the surface tension. The obtained values are in excellent agreement with literature data.

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“…Heterogeneous nucleation is considered thermodynamically more favorable than homogeneous nucleation when the contact angle (θ), as defined in Figure 2.16, is smaller than 180°. 237 A relatively simple heterogeneous nucleation model was deduced and reported by Volmer in 1929. 238 This model assumes that liquid clusters grow on a planar substrate as a spherical cap with a constant wetting angle.…”

Section: Nanoparticlesmentioning

confidence: 99%

Silicon-containing nanoparticles: from functional materials to real-life applications

Yin

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Silicon-containing nanoparticles are considered a promising class of materials with exciting physical properties and the potential to revolutionize many emerging application areas. This Chapter introduces the fundamental aspects of silicon-containing nanoparticles and their most common production approaches. In addition, we provide a comprehensive overview of the frontiers of silicon-containing nanoparticle research for the growing fields of printable Silicon-containing electronics, theranostics, nanocellular polymer foaming, and catalysis. We include an introduction to readily applicable particle surface modification strategies as well. Finally, the limitations and challenges for the successful commercialization of silicon-containing nanoparticles in the application fields mentioned are also presented and discussed.

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Interfacial phenomena, metals processing and properties

Cited by 6 publications

References 32 publications

Numerical investigation of particle motion at the steel—slag interface in continuous casting using VOF method and dynamic overset grids

Numerical investigation of particle motion at the steel—slag interface in continuous casting using VOF method and dynamic overset grids

Novel High-Temperature Experimental Setup to Study Dynamic Surface Tension Phenomena in Oxide Melts

Silicon-containing nanoparticles: from functional materials to real-life applications

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