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On the limit of linear viscoelastic response in the flow between eccentric rotating disks
Author(s) -
Jongschaap R. J. J.,
Knapper K. H.,
Lopulissa J. S.
Publication year - 1978
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.760181009
Subject(s) - viscoelasticity , limit (mathematics) , rheology , flow (mathematics) , limiting , mechanics , simple (philosophy) , materials science , eccentric , physics , classical mechanics , thermodynamics , mathematical analysis , mathematics , quantum mechanics , mechanical engineering , philosophy , epistemology , engineering
The dependence on frequency of the limiting value of strain, ψ L , for which linear Viscoelastic response occurs in eccentric rotating disks (ERD) flow is studied theoretically and experimentally. The theoretical investigations are based upon the general simple‐fluid theory of Coleman and Noll. It is shown that according to this theory ψ L becomes independent of angular velocity, ω, at relatively high frequencies, whereas ψ L becomes inversely proportional to ω at sufficiently low frequencies. The results of previous investigations, based upon some special rheological models, are discussed. The behavior predicted by the simple‐fluid theory is confirmed by experiments on polyisobutylene solutions.