MODELLING OF THE PERMEABILITY FOR COLUMNAR DENDRITE STRUCTURES DURING SOLIDIFICATION OF MUSHY ALLOYS

A numerical model has been developed for the determination of liquidflow permeability throughcolumnar dendrite during growth. the model is inclusive two stages, first numerical evolution ofthe dendriteshape during growth, and second numerical determination of the interdendritic liquid permeability.simulation results shown which solute concentration by evolution ofdendrite shape could result to reductionofthe permeability during solidification time. comparison between the experimental data from other authorsand the present numerical model data, for the low and high solid fractions, has shown a good agreementrather than current numerical models. therefore present permeability model, in this investigation, could beused for all of the micro solidification codes by coupling on the segregation and the fick's equations indomain ofthe inter-dendritic liquidfor mushy alloys.