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Melt transformation coextrusion. II: Flow analysis
Author(s) -
Perez M. A.,
Collier J. R.
Publication year - 1989
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.760291507
Subject(s) - materials science , shear stress , power law fluid , non newtonian fluid , mechanics , flow (mathematics) , newtonian fluid , finite element method , generalized newtonian fluid , shear rate , power law , boundary value problem , stress (linguistics) , shear (geology) , geometry , composite material , thermodynamics , rheology , mathematical analysis , mathematics , physics , linguistics , statistics , philosophy
Melt Transformation Coextrusion for power law fluids was analyzed with particular attention being paid to the influence of the die's geometrical shape on flow patterns, and to skin layer effect on the velocity profile and shear stress at the interface between layers in a three‐layered system. Volumetric flow rate expressions were also generated for the aforementioned system, and stream and potential functions were derived for a free boundary converging film geometry. Newtonian as well as non‐Newtonian fluids were considered for this analysis in which the streamline shape changes their convergence downstream into the land section. Also, a finite element solution technique was utilized to reveal shear stress profiles that arise from the flow of high density polyethylene at 200°C in a converging fixed boundary geometry.