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Flow and Heat Transfer Behavior in the Mold

Tiebiao Shi and Brian Thomas

Continuous Casting Consortium

Fluid flow in the mold has great influence on the dissipation of superheat, entrapment of flux globules and gas bubbles and flow and consumption of top surface flux layers. All these phenomena can lead to costly defects in the continuous-cast product. Fluid flow in the mold is influenced by factors such as mold geometry, nozzle structure, liquid feeding speed, submergence depth, gas flow rate etc. A good understanding of the degree to which each possible factor can influence the fluid flow behavior would be very helpful for setting up optimized design of casting process. This project aims to invest igate this by using 3D steady fluid flow models, combined with validation studies on both water models and plant measurements.

Figure 1.

0% Gas 0.5 mm bubble 1.0 mm bubble 2.0 mm bubble
(Click on any picture for a larger version.)

This plot shows how bubble size influences the flow pattern in the liquid pool.

Figure 2.

Some defects in continuous casting are associated with heat transfer in liquid pool. With the aid of CFX, the heat transfer behavior in the liquid pool is revealed. Here,one example of the superheat distribution in the liquid pool is shown.