A NEW TRANSIENT METHOD FOR ANALYSIS OF SOLIDIFICATION IN THE CONTINUOUS-CASTING OF METALS

Solidification processes involve complex heat and mass transfer phenom ena, the modelling of which requires state-of-the art numerical techni ques. An efficient and accurate transient numerical method is proposed for the analysis of phase change problems. This method combines both the enthalpy and the enhanced specific heat approaches in incorporatin g the effects of latent heat released due to phase change. The sensiti vity and accuracy of the proposed method to both temporal and spatial discretization is shown together with closed-form solutions and the re sults from the enhanced specific heat approach. In order to explore th e proposed method fully, a non-linear heat release, as is the case for binary alloys, is also examined. The number of operations required fo r the new transient approach is less than or equal to the enhanced hea t capacity method depending on the averaging method adopted. To demons trate the potential of this new finite-element technique, measurements obtained on operating machines for the casting of zinc, aluminum and steel are compared with the model predictions. The death/birth techniq ue, together with the proper heat-transfer coefficients, were employed in order to model the casting process with minimal error due to the m odelling itself.