Influence of Wettability on the Behavior of Argon Bubbles and Fluid Flow inside the Nozzle and Mold.

Wang, Zhe; Mukai, Kusuhiro; Izu, Daisuke

doi:10.2355/isijinternational.39.154

Cited by 49 publications

(24 citation statements)

References 1 publication

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“…Wang et al studied the influence of wettability on the behavior of argon bubbles and fluid flow. 15) Although physical water models are well able to model single-phase fluid flow owing to the simulation kinematic viscosity of steel and water, the flow pattern itself is actually not of greatest interest. Furthermore, the physical bottom used in the water model interferes with the flow, the moving solidifying shell cannot be properly accounted, and properties related to other phenomena such as multiphase flow, heat transfer, and slag entrainment do not have proper similitude.…”

Section: Introductionmentioning

confidence: 99%

“…Extensive past work has employed physical water models to successfully investigate fluid flow phenomena in the mold region of the continuous casting process. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] The first study was carried out by Afanaseva et al 1) for a straight bore nozzle system. Heaslip et al extensively studied fluid flow in submerged entry nozzles under stopper-rod control and slide-gate control.…”

Section: Introductionmentioning

confidence: 99%

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Mathematical Modeling of Iron and Steel Making Processes. Mathematical Modeling of Fluid Flow in Continuous Casting.

2001

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Fluid flow is very important to quality in the continuous casting of steel. With the high cost of empirical investigation and the increasing power of computer hardware and software, mathematical modeling is becoming an important tool to understand fluid flow phenomena. This paper reviews recent developments in modeling phenomena related to fluid flow in the continuous casting mold region, and the resulting implications for improving the process. These phenomena include turbulent flow in the nozzle and mold, the transport of bubbles and inclusion particles, multi-phase flow phenomena, the effect of electromagnetic forces, heat transfer, interfacial phenomena and interactions between the steel surface and the slag layers, the transport of solute elements and segregation. The work summarized in this paper can help to provide direction for further modeling investigation of the continuous casting mold, and to improve understanding of this important process.KEY WORDS: mathematical modeling; computational simulation; review; continuous casting; nozzles; molds; multiphase; turbulent; fluid flow; electromagnetic; coupled solidification; inclusion entrapment; segregation.steel. This paper will review recent developments in modeling each of the phenomena above, which are related to fluid flow in the continuous casting mold, and the resulting implications for improving the continuous casting process. Fluid Flow ModelingA typical three dimensional fluid flow model solves the continuity equation and Navier Stokes equations for incompressible Newtonian fluids, which are based on conserving mass (one equation) and momentum (three equations) at every point in a computational domain. 17,18) The solution of these equations, given elsewhere in this issue, 19) yields the pressure and velocity components at every point in the domain. At the high flow rates involved in this process, these models must incorporate turbulent fluid flow. Many different turbulence models have been employed by different researchers for fluid flow in continuous casting, such as effective viscosity models 20,21) (for the cylindrical mold and straight nozzle), one equation turbulence models (turbulent energy plus a given length-scale), 22) two-equation turbulence models such as the K-e Model, 19,23) LES (Large Eddy Simulation), [24][25][26][27][28] possibly with a SGS (sub-grid scale) model, 29,30) and DNS (Direction Numerical Simulation). 19)Among these models, direct numerical simulation is the simplest yet most computationally-demanding method. DNS uses a fine enough grid (mesh), to capture all of the turbulent eddies and their motion with time. To achieve more computationally-efficient results, turbulence is usually modeled on a courser grid using a time-averaged approximation, such as the popular K-e model, 23) which averages out the effect of turbulence using an increased effective viscosity field, m eff . This approach requires solving two additional partial differential equations for the transport of turbulent kinetic energy and its dissipation rate.19...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mathematical Modeling of Iron and Steel Making Processes. Mathematical Modeling of Fluid Flow in Continuous Casting.

2001

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“…These results showed substantially the same tendency as previous studies. [12][13][14] 3. Electrochemical Decomposition of CO 2 Gas in CaCl 2 -CaO Molten Salt…”

Section: Resultsmentioning

confidence: 99%

Influence of Gas Injection Pipe on CO2 Decomposition by CaCl2–CaO Molten Salt and ZrO2 Solid Electrolysis

Ozawa¹,

Matsuno²,

Fujibayashi³

et al. 2016

ISIJ Int.

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The electrochemical decomposition of carbon dioxide to form carbon and oxygen gas in CaCl 2 -CaO molten salt was studied. A water model experiment was carried out to study the influence of the tip shape of the pipe, the pipe diameter and the wettability of the gas injection pipe on the bubble shape in the molten salt. Bubbles were formed with both a horizontal tip and an oblique tip when the wettability of the gas injection pipe was good. The specific surface area of the bubbles when using the oblique tip was smaller than when using the horizontal tip. On the other hand, slug flows appeared when wettability was poor. In a hot model experiment, the current density was measured, and it was found that the CO 2 gas concentration decreased. Precipitated carbon was detected from the sample after the experiment. With the same pipe, the decrease of the CO 2 gas concentration when using the oblique tip was more remarkable than when using the horizontal tip. It is likely that the form of the CO 2 gas in the molten salt was bubble-shaped.

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“…7) An understanding of the behaviors of argon gas and molten steel descending in the immersion nozzle is of practical importance to avoid the pin-hole and sliver defects. Wang et al 8,9) observed the behavior of air descending in a model immersion nozzle made of acrylic pipe. The inner wall of the nozzle was coated with paraffin to make the wettability of the wall be poor.…”

Section: Introductionmentioning

confidence: 99%

Model Experiment on the Behavior of Argon Gas in Immersion Nozzle

Ishiguro

Iguchi

2003

ISIJ International

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Influence of Wettability on the Behavior of Argon Bubbles and Fluid Flow inside the Nozzle and Mold.

Cited by 49 publications

References 1 publication

Mathematical Modeling of Iron and Steel Making Processes. Mathematical Modeling of Fluid Flow in Continuous Casting.

Mathematical Modeling of Iron and Steel Making Processes. Mathematical Modeling of Fluid Flow in Continuous Casting.

Influence of Gas Injection Pipe on CO<sub>2</sub> Decomposition by CaCl<sub>2</sub>–CaO Molten Salt and ZrO<sub>2</sub> Solid Electrolysis

Model Experiment on the Behavior of Argon Gas in Immersion Nozzle

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