| Numerical Analysis for travelling electromagnetic field, turbulent fluid flow and heat transfer during the electromagnetic direct chill (DC) casting of aluminium alloys were carried out. The influences of coil current, frequency and the travelling direction of electromagnetic field on electromagnetic force, flow velocity, effective viscosity and the shape of the solidification shell were examined. It was found that electromagnetic force, flow rate and effective viscosity become maximum with the frequency at which the penetration depth of electromagnetic field becomes about half of the ingot radius. The liquid sump depth does not change significantly when downwards travelling magnetic field is applied, while it become large when upwards travelling field is applied. The flow velocity and effective viscosity increase more strongly with coil current for downward traveling field than for upward travelling one. |
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