MODELADO DE LAS FUERZAS DE ARRASTRE SOBRE UNA PARTÍCULA ESFÉRICA FRENTE A INTERFASES DE SOLIDIFICACIÓN CÓNCAVAS

E. M. AGALIOTIS; M. R. ROSENBERGER; A. E. ARES; C. E. SCHVEZOV

Anales AFA

ANALES AFA. CRECIC. UNCPBA – CICPBA

Lugar: Tandil, Pcia de Buenos Aires; Año: 2008 vol. 20 p. 161 - 165

0327-358X

The pushing of particles by a solidifying interface is a phenomenon that generally occurs during solidification ofa melt containing foreign or native particles. As a result, the particles could be segregated and affect the expectedproperties of the material. The interaction of a foreign particle with a solidifying interface is studied withnumerical modelling. The model includes two main forces; the drag and the pushing forces. The drag force iscalculated from the fluid flow, the repulsion force by the Lifshitz-Van der Waal model. The thermal field isdecoupled from the force field. The model is applied to a metallic matrix and particles with similar and higherthermal conductivities; giving planar and concave interface shapes respectively. The steady state of pushing isstudied for the same conditions and different solidification velocities and particle radius. The results show that aconcave interface shape generates higher drag forces about one order the magnitude higher than those for aplanar interface at the same separation. As a result the critical velocity is less than that corresponding to a planarinterface.