Two-Phase Flow in Continuous Casting

Understanding the behavior of steel-Ar two-phase jet and steel flow around the jet is essential for the design of effective methods of removing small bubbles. Numerical techniques have been developed to predict such a flow field [1,2, 11, 12]. Although the accuracy of numerical prediction is improving, the underlying physics is not fully developed and the techniques are still relatively complicated to use in a routine manner. A simplified method is therefore highly desirable. 

In this section, a description is provided of the use of water-air two-phase jet to model steel-Ar two-phase system. The horizontal and vertical velocity components are measured with a two-channel laser Doppler velocimeter [17]. Empirical relations are given for the mean values and the root-mean-square values of the turbulence components. Predictions of the trajectory of the two-phase jet are also discussed. 

Iguchi and O.J. Ilegbusi, Modeling Multiphase Materials Processes Gas-Liquid Systems, DOI 10.1007/978-l-4419-7479-2 8, 

Details of the actual continuous casting processes and model experiments are given in Table 8.1. Also, included are the following three dimensionless parameters for single-phase liquid flow Re, Fr, We) and one dimensionless parameter for Uquid-gas two-phase flow (ry)  

In the above relations, Re is the Reynolds number, mo is the liquid flow velocity at the nozzle outlet, d i is the inner diameter of the nozzle, vl is the kinematic viscosity of liquid, Fr is the Froude number, g is the acceleration due to gravity, is the density of liquid. We is the Weber number, a is the surface tension of liquid, is the velocity ratio defined subsequently, and 2g is the gas flow rate. 

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Kubo N, Ishii T, Kubota J, Suzuki M, Nakata M (1997) Two-phase flow simulation of molten steel and aigon gas in continuous casting mold. CAMP ISIJ 10 758... 

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