Influence of Coil Configuration and Operating Conditions on Heat Transfer in Inductively Heated Risers
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Electromagnetic (EM) induction heating of open top risers represents an energy-efficient method to preserve mass feeding whilst allowing for the use of a smaller riser and thus higher casting yield. Numerical simulation results for an ill-designed, concentric riser and casting assembly predicting the EM field characteristics and solidification behavior in such systems are presented herein. A vector potential formulation of the EM field was used and solved using a hybrid control volume/integral method, featuring temperature-dependent electrical conductivity. The heat transfer equation with phase change was also solved using the control volume technique. The computed results showed that use of induction heating could shift the hot spot from the casting to the riser. It was also found that use of higher coil frequencies produced a guard heating effect at the periphery of the riser, which was then applied using a new L-shaped coil geometry.
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