Simulation of Fluid and Inclusions Dynamics during Filtration Operations of Ductile Iron Melts Using Foam Filters

摘要: The use of ceramic foam filters in ductile iron foundries to reduce the number inclusions that reach casting has been widely accepted. However, exact mechanisms contributing filter effectiveness are not yet known; this limits ability maximize performance and inclusion reduction. objective work is qualify quantify effects structure on retention. This accomplished through development a three-dimensional (3-D) mathematical model, based physical water modeling simulations. It was found rate density play minor roles capture ratio, while size most influent variable. One mechanism for capturing involves direct impact an web wall its adhesion after crossing over liquid film. Two additional involve entrainment by buoyancy-lift forces into low-velocity fields ulterior buoyancy effects. second microrecirculating flows; remain these flows times exceed mold filling time. latter limited intensity approximately 30 100 μm size. In order enhance range sizes, vorticity magnitude microfree shear filter’s pores must be increased, changes geometry device.