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Techniques for the viscometry of suspensions
Author(s) -
Cross M. M.,
Kaye A.
Publication year - 1986
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.760260202
Subject(s) - viscometer , torque , angular velocity , constant angular velocity , materials science , rheology , displacement (psychology) , shear rate , mechanics , viscosity , angular displacement , rotational speed , newtonian fluid , ligand cone angle , cone (formal languages) , shear (geology) , optics , geometry , physics , classical mechanics , composite material , mathematics , thermodynamics , psychology , algorithm , psychotherapist , conical surface
Techniques are presented for the rotational viscometry of suspensions, using modified cone/plate and parallel plate configurations. For displaced cone‐and‐plate geometry an analysis considers the torque developed on the cone as a function of its angular velocity and the displacement at its apex. The two situations of constant angular velocity and of constant displacement present alternative methods for computing viscosity/shear‐rate data from torque/displacement or torque/angular velocity measurements. Neither method involves any assumption regarding the rheological properties of the test fluid and both can be extended to parallel plate geometry. An alternative and simpler approach uses an annular cone/plate configuration, in which conditions of uniform shear rate can be maintained with an operating gap of the order of 1 mm. The validity of the different techniques is tested by comparison with conventional cone‐and‐plate measurements, using a non‐Newtonian solution of polyisobutylene as a test fluid.