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Studies of non‐newtonian flow I. Criterion of flow instability
Author(s) -
Overdiep W. S.,
Van Krevelen D. W.
Publication year - 1965
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1965.070090812
Subject(s) - instability , mechanics , newtonian fluid , elastic instability , flow (mathematics) , turbulence , slip (aerodynamics) , shear flow , non newtonian fluid , physics , materials science , thermodynamics
It is shown that the flow instability of polymer melts occurring above a certain critical shear stress is a direct result of the degree of non‐Newtonian behavior of the flowing liquid. Melt fracture, elastic turbulence, and slip‐stick effects are a consequence of this instability, which frequently leads to periodic phenomena. The condition for the occurrence of flow instability is derived.