Portal de Periódicos da CAPES

Theoretical Analysis and Model Experiments on the Formation Mechanism of Channel-type Segregation

1978; Volume: 18; Issue: 2 Linguagem: Inglês

10.2355/isijinternational1966.18.90

1881-1183

Shigeo Asai, Iwao Muchi,

Groundwater flow and contamination studies

T o clarifY the mechanism causing challlle/-tyj)e segregatioll, experimellts are conducted 011 a model S)lstem of all aqueous solutioll of N H .CI, alld theformatioll processes of challlleis alld the .flowjJallern ill the musll)l ZOlle are visua lizpd.T aking account of the observed results.theoretictll allafysis 011 the simultalleous hea t, mass alld momelltum trallifer ill the mushy ::olle is carried out, alld a mathematical model for the c/wlIlIel-tvpe segregatioll is developed.FOCIISillg on the difference ~rth e cooling cOllditiolls,further, the instability j)hellomell{/ illducing the challllel are theoreticalfy allali::ed 011 the basis of the /)erturbatioll theory.The anafytical resulis are COli firmed h)1 the model experimellts.Thermal insulation of the side walls is esselltial for preventillg the challnel-l)lpe segrega tioll.II'hen a mold is to be cooled through its side walls, /)Yoper -,election qf ollo.vfinnm ts can sti ll prPlImt the forma tion of c/wnnpis.