Effect of Particle Velocity on Penetration and Flotation Behavior

Matsuzawa, Akihiro; Sasai, Katsuhiro; Harada, Hiroshi; Numata, Mitsuhiro

doi:10.2355/isijinternational.isijint-2018-400

Cited by 4 publications

(7 citation statements)

References 10 publications

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“…Penetrability of gas‐particle jets : A lot of research interest has been directed at studying the penetration behavior of particles. Matsuzawa et al divided experimental studies on penetration behavior into two categories: 1) experiments with fine powder with the aim of providing information on the macroscopic behavior of the system, and 2) experiments with relatively large single particles to provide detailed information on microscale phenomena.…”

Section: Modeling Of Fluid Flow Phenomenamentioning

confidence: 99%

A Review of Modeling Hot Metal Desulfurization

Visuri

Vuolio

Haas

et al. 2020

steel research int.

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Hot metal desulfurization serves as the main unit process for removing sulfur in blast‐furnace based steelmaking. The available body of literature on modeling hot metal desulfurization is reviewed to provide an in‐depth analysis of the approaches used and results obtained. The mathematical models for reaction kinetics have evolved from simplistic rate equations to more complex phenomenon‐based models that provide useful information on the effect of physico‐chemical properties and operating parameters on desulfurization efficiency. Data‐driven approaches with varying levels of phenomenological basis have also been proposed with the aim of achieving better predictive performance in industrial scale applications. Bath mixing has been studied using physical and numerical modeling to optimize mixing conditions in ladles and torpedo cars. The coupling of gas‐particle jets and their penetration into the liquid have been a focal point of physical and numerical modeling. In recent years, the fluid flow phenomena in mechanically stirred ladles has been studied extensively using physical and numerical modeling. These studies have focused on the fluid flow field, reagent dispersion, and bubble dispersion.

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Section: Modeling Of Fluid Flow Phenomenamentioning

confidence: 99%

A Review of Modeling Hot Metal Desulfurization

Visuri

Vuolio

Haas

et al. 2020

steel research int.

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“…Experiments herein were performed using the same method as that in a previous work. 26) A predetermined amount of Ar gas was inserted into the vessel through a single-hole nozzle (5 mm inner diameter), which was set at the center of the upper plate of the vacuum vessel. The nozzle had a length of 70 or 140 mm, and the water depth in the vessel before reducing the pressure was 80 mm.…”

Section: Methodsmentioning

confidence: 99%

“…However, there are hardly researches focused on the flotation process of the particle after penetration or contact time of the particle with the liquid. Therefore, in a previous work, 26) the authors evaluated entire behavior from penetration to flotation via a water model experiment blasting a single particle to the water surface, and reported that the residual bubble on the particle significantly affects the detention time. Herein, same experiments are performed by changing the wettability of the particle, and the effect of wettability on the penetration depth and the detention time of the particle are investigated.…”

Section: Effect Of Wettability On Penetration and Flotation Behavior Of A Particle In Refining Processmentioning

confidence: 99%

“…5. 26) (a) Particle velocity after penetration, v P1 , was calculated using the transfer distance between two frames (0.004 s) just after penetration into the water surface. (b) Maximum air column length, H max , was defined as the distance from the base point to upper side of the particle just before rupture of the air column, and (c) maximum penetration depth, L max , was defined as the distance from the base point to center of the particle at maximum depth.…”

Section: Changes Of Penetration Depth Over Time Of a Particlementioning

confidence: 99%

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Effect of Wettability on Penetration and Flotation Behavior of a Particle in Refining Process

et al. 2021

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Powder blasting is often performed in refining processes for improving their reaction efficiency. Herein, the effect of wettability on penetration and flotation behavior of a particle was examined via a water model experiment. A polypropylene particle was blasted onto the water surface with Ar gas through a single-hole nozzle, and the behavior of the particle during penetration into water to flotation on the water surface was recorded using a high-speed camera. Wettability between the particle and water was changed by applying a repellent or hydrophilic material on the particle. Based on the penetration of the particle, an air column was generated and a residual bubble remained on the particle after the air column ruptured. Repellent particles floated on the water surface in a short period of time because the maximum penetration depth was short and the diameter of the residual bubble was large. Conversely, hydrophilic particles stayed longer in water than repellent particles because the maximum penetration depth was relatively long and the residual bubble detached from the particle. The mechanism which wettability affects penetration and flotation behavior was analyzed, and it was elucidated that the controlling factor of particle behavior is the adhesion point of the air column on the particle. In the case of repellent particles, the adhesion point changes toward to penetrating direction of the particle and the force caused by the surface tension of water increases. Therefore, the maximum penetration depth decreases and the diameter of the residual bubble increases. KEY WORDS: refining process; water model experiment; wettability of a particle; air column; residual bubble; detention time of a particle.

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“…Detail analysis for the drag force and velocity of floating particles in metallurgical systems can be seen in. [34][35][36] In the present work, Stokes' law was assumed for the drag coefficient, and terminal velocity of a spherical solid particle sinking or floating in the melt was calculated by balancing the drag force to the net buoyancy force which is given as: However, motion of the particle will be hindered by the presence of a growing number of surrounding particles as the solidification process continues, which rapidly increases the apparent viscosity of the system. Several expressions are suggested in literature for calculating the hindered settling velocity, however, the Einstein-Roscoe equation, 37) and the Steinour equation 38) are the most common approaches referred to in ironmaking and steelmaking applications 3,[39][40][41] which are also used in this study.…”

Section: Floating Modelmentioning

confidence: 99%