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Gomez E.R.,Circuito Of Los Institutos S N | Zenit R.,National Autonomous University of Mexico | Rivera C.G.,Circuito Of Los Institutos S N | Trapaga G.,CINVESTAV | Ramirez-Argaez M.A.,Circuito Of Los Institutos S N
Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science | Year: 2013

In this work, a 3D numerical simulation using a Euler-Euler-based model implemented into a commercial CFD code was used to simulate fluid flow and turbulence structure in a water physical model of an aluminum ladle equipped with an impeller for degassing treatment. The effect of critical process parameters such as rotor speed, gas flow rate, and the point of gas injection (conventional injection through the shaft vs a novel injection through the bottom of the ladle) on the fluid flow and vortex formation was analyzed with this model. The commercial CFD code PHOENICS 3.4 was used to solve all conservation equations governing the process for this two-phase fluid flow system. The mathematical model was reasonably well validated against experimentally measured liquid velocity and vortex sizes in a water physical model built specifically for this investigation. From the results, it was concluded that the angular speed of the impeller is the most important parameter in promoting better stirred baths and creating smaller and better distributed bubbles in the liquid. The pumping effect of the impeller is increased as the impeller rotation speed increases. Gas flow rate is detrimental to bath stirring and diminishes the pumping effect of the impeller. Finally, although the injection point was the least significant variable, it was found that the "novel" injection improves stirring in the ladle. © 2012 The Minerals, Metals & Materials Society and ASM International. Source


Gomez E.R.,Circuito Of Los Institutos S N | Zenit R.,National Autonomous University of Mexico | Rivera C.G.,Circuito Of Los Institutos S N | Trapaga G.,CINVESTAV | Ramirez-Argaez M.A.,Circuito Of Los Institutos S N
Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science | Year: 2013

In the current study a transparent water physical model was developed to study fluid flow and turbulent structure of aluminum ladles for degassing treatment with a rotating impeller and gas injection. Flow patterns and turbulent structure in the ladle were measured with the particle image velocimetry technique. The effects of process parameters such as rotor speed, gas flow rate, and type of rotor on the flow patterns and on the vortex formation were analyzed using this model, which control degassing kinetics. In addition, a comparison between two points of gas injection was performed: (a) conventional gas injection through the shaft and (b) a "novel" gas injection technique through the bottom of the ladle. Results show that the most significant process variable on the stirring degree of the bath was the angular speed of the impeller, which promotes better stirred baths with smaller and better distributed bubbles. A gas flow rate increment is detrimental to stirring. Finally, although the injection point was the less-significant variable, it was found that the "novel" injection from the bottom of the ladle improves the stirring in the ladle, promotes a better distribution of bubbles, and shows to be a promising alternative for gas injection. © 2013 The Minerals, Metals & Materials Society and ASM International. Source

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