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A COMPARATIVE STUDY OF THE PERFORMANCE OF SELECTED IN‐LINE VISCOMETERS ON NEWTONIAN AND SHEAR‐THINNING FLUIDS *
Author(s) -
ZIMMER LAURA A.,
HALEY TIMOTHY A.,
CAMPANELLA OSVALDO H.
Publication year - 2001
Publication title -
journal of texture studies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.593
H-Index - 54
eISSN - 1745-4603
pISSN - 0022-4901
DOI - 10.1111/j.1745-4603.2001.tb01036.x
Subject(s) - viscometer , rheometry , newtonian fluid , ubbelohde viscometer , shear thinning , non newtonian fluid , viscosity , rheology , mechanics , materials science , xanthan gum , rheometer , composite material , physics
Three commercial instruments for in‐line process measurement of fluid viscosity (an oscillating sphere viscometer, a tube viscometer and a coaxial cylinder viscometer) were evaluated using a Newtonian (60% sucrose) and two shear‐thinning fluids (0.5% xanthan gum and 2% hydroxypropyl methylcellu‐lose). The oscillating sphere viscometer required little or no calibration to measure the viscosity of Newtonian fluids. Otherwise, when compared to results given by analytical off‐line rheometry, the in‐line viscometers were found to be grossly inaccurate in predicting viscosity. A methodology is presented to correct the flow curves generated by each in‐line instrument such that the output measurements are consistent with that given by off‐line rheometry. Additional characteristics of each instrument that should be considered when choosing an instrument for in‐line process application are presented.