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Axial pressure profiles in non‐newtonian flow: Part II: Viscometric flow and relaxation phenomena analyses
Author(s) -
Blum David B.,
Yerushalmi Joseph,
Williams David J.
Publication year - 1972
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450500505
Subject(s) - swell , newtonian fluid , shear stress , mechanics , thermodynamics , stress (linguistics) , relaxation (psychology) , stress relaxation , shear rate , flow (mathematics) , materials science , shear (geology) , non newtonian fluid , physics , rheology , composite material , philosophy , creep , psychology , social psychology , linguistics
Extensive pressure profile data were compiled for a 16.5% polyisobutylene solution in mineral spirits. Values of stored elastic energy obtained from these data compare favorably with those ascertained from die swell and from entrance correction methods. The viscometric normal stress differences were significantly larger than the shear stress and, particularly, the second normal stress rose to a maximum where it was an order of magnitude larger than the first normal stress difference. Time constants calculated from swell decay and entrance‐borne elastic stress relaxation are essentially the same and show an approximate inverse relation to the shear rate.