Numerical Simulation of Degassing Phenomena in Direct Chilled Casting Process under External Static Magnetic Field on Flow Pattern in Slab Mold

摘要

For good quality billet, metal degasing is importantrnconsideration in billet casting. In-line degasser processesrnhelp to remove 61 to 66% of the dissolved gas. Anrnimproved billet quality can increase extrusion speed. Arnmodel of degassing delineates the most important keyrnfactors for optimization of product design for high quality,rnproductivity and cost savings using computer simulations.rnThe present work focuses on aluminum direct chilledrncasting process with gas injected in the mold through arnsubmerged entry nozzle. The effects of gas into the meltrnand a direct casting magnetic field on the mold fluid flowrnare studied. Considering the effect of complex flow,rninjection and heat transfer on the gas bubble size thernparticles model reveals to be an efficient method to studyrnthe degassing phenomenon. However, the model treats therngaseous phase as bubbles with multiple sizes providing arnnew approach to simulate multiphase flow in continuousrncasting.