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Nonisothermal flow of a generalized power‐law fluid in converging sections for rubber extrusion
Author(s) -
Kakouris A. P.,
Freakley P. K.,
Harrison M. C.
Publication year - 1987
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.760271804
Subject(s) - die swell , materials science , rheology , mechanics , pressure drop , power law fluid , power law , flow (mathematics) , extrusion , natural rubber , thermodynamics , mathematics , composite material , physics , statistics
A method for predicting pressure drop and temperature distribution in convergent sections is proposed. The generalized power‐law rheological equation of state is used. Only the shear component of the converging flow is considered in order to estimate its contribution to total flow in such sections. A finite‐difference scheme was used to simulate the flow. The method was applied to an ethylenepropylene terpolymer compound using different angles of approach for which the pressure drop and the extrudate temperature had been measured experimentally. Comparison with theoretically predicted data showed excellent agreement for small angles, while for large angles the inclusion of extensional effects was found to be necessary. The contribution of viscous dissipation effects was found to be negligible for the converging sections tested.