Abstract
The permeability of interdendritic space was measured using unidirectionally frozen organic borneol-paraffin alloys whose columnar dendrite structure was the same as that of metallic alloys of f.c.c. and b.c.c. An aqueous solution containing a small amount of red ink and 25 vol.% surface active agent was made to flow in the interdendritic space in the directions parallel to and normal to columnar dendrites. In both flow cases, the permeability was approximately proportional to the cube of the fraction liquid. For flow normal to columnar dendrites, the permeability increased with primary and secondary arm spacings. When the flow direction was parallel to columnar dendrites, the permeability increased with increasing primary arm spacing but it decreased with increasing secondary arm spacing.
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