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Numerical nonisothermal flow analysis of non‐Newtonian fluid in a nonintermeshing counter‐rotating twin screw extruder
Author(s) -
Fukuoka Takamasa,
Min Kyonsuku
Publication year - 1994
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.760341302
Subject(s) - streamlines, streaklines, and pathlines , mechanics , residence time distribution , materials science , plastics extrusion , shear rate , shear flow , non newtonian fluid , newtonian fluid , residence time (fluid dynamics) , stream function , generalized newtonian fluid , mixing (physics) , thermodynamics , flow (mathematics) , viscosity , physics , composite material , engineering , vorticity , geotechnical engineering , quantum mechanics , vortex
A simulation technique for nonisothermal flow analysis of non‐Newtonian fluid in a nonintermeshing counter‐rotating twin screw extruder was developed by modifying the flow analysis network (FAN) method. The local shear viscosity in the flow field was calculated by an iteration method combing the three types of mean shear rate functions. The modified Cross model and an Arrhenius‐type function for temperature dependence were also introduced. Streamlines in the flow field are represented by computing the movements of fluid particles based on the flux fields. The computed residence time from the streamlines led us to solve the energy equation by replacing the coordinate system. The profiles of pressure, shear rate, shear viscosity, temperature, and residence time were simulated. The influence of operating and geometrical parameters on the screw characteristics are discussed. Further, residence time distribution (RTD), strain distribution function (SDF), and interfacial area growth are predicted from the computation of streamlines to analyze the mixing capabilities of the extruder.