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Volume 31 (2024)
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Advances and Applications in Fluid Mechanics
Advances and Applications in Fluid Mechanics
Volume 1, Issue 1, Pages 81 - 90 (January 2007)
TRANSPORT PHENOMENON IN GAS-STIRRED LADLE SYSTEMS WITH A SLAG LAYER
Wen-Jei Yang (U.S.A.) and Shuichi Torii (Japan)
Abstract:
When liquid steel is poured into a ladle in steelmaking process, an uncontrolled amount of slag layer is formed. Since its density is lower than that of steel, this slag forms an upper phase of certain thickness, density and viscosity. Although this slag layer can help preventing thermal stratification in the underlying liquid steel, its chemical characteristics may contribute to lessen the rate of refining process. Hence, it is important to know how the gas medium injected into the ladle for stirring operation interacts with the overlying stag layer in determining overall transport phenomena. Based on results obtained in numerical flow visualization Park [6], the present study proposes a “target shooting” model to simulate interaction between injected gas flow and overlaying slag in a gas-stirred ladle in steelmaking process. The ascension of gas bubbles in the plume region resembles the trajectory of bullets ejected from the nozzle exit of gas injection. The impact of these ascending gas bubbles produces an opening in the overlying slag layer. The model can determine the instantaneous location, velocity, and size of gas bubbles and the spacing between two consecutive bubbles. The dimensionless parameters governing transport phenomena in the gas-stirred ladle are obtained and employed in deriving a general empirical correlating formular.
Keywords and phrases:
gas-stirred ladle, slag layer, transport phenomena modeling, governing dimensionless parameter.
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