Abstract
The permeability for liquid in interdendritic space was measured using a unidirectionally frozen borneol–paraffin organic binary alloy the columnar dendrite structure of which is the same as that of bcc and fcc metallic alloys. For flow parallel to and normal to columnar dendrites, the permeability for volume fractions of liquid from 0·21 to 0·22 is in fairly good agreement with the value calculated from the empirical formulae obtained previously for volume fractions of liquid > 0·27. Thus, the formulae are applicable over a wide range of liquid volume fractions. The permeability is approximately proportional to the cube of the volume fraction of liquid. When the volume fraction of liquid is < 0·20, the permeability begins to decrease steeply with decreasing volume fraction of liquid. The permeability obtained in the present work is confirmed to be applicable to bcc and fcc metallic alloy systems.
MST/1028
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