Premium
The effect of surface tension on extrudate swell from square and rectangular channels
Author(s) -
Gifford W. A.
Publication year - 1998
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.10284
Subject(s) - die swell , materials science , surface tension , swell , extrusion , capillary action , composite material , tension (geology) , newtonian fluid , square (algebra) , mechanics , geometry , thermodynamics , mathematics , physics , ultimate tensile strength
The effect of surface tension on extrudate swell of a Newtonian fluid from square and rectangular channels is presented. Surface tension decreases extrudate cross‐sections in all cases examined. The influence on the shapes of final extrudate profiles is found to be greater for channels with higher aspect ratios. Surface tension has the greatest influence on the swell of the longer side of the extrudate while that of the shorter side is virtually unaffected. The effect of the capillary number can be significant and in certain cases should be considered in the design of extrusion dies.