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Viscometer for low frequency, low shear rate measurements

Published

Author(s)

Robert F. Berg, Michael R. Moldover

Abstract

We describe a torsion-oscillator viscometer whose low frequency ( 0.5 Hz) and very low shear rate (0.05 s-1) are required for measurements of shear sensitive fluids such as microemulsions, polymer melts and solutions gels, and liquid mixtures near critical points. The viscometer has a resolution of 0.2% when used with liquid samples and a resolution of 0.4% when used with a dense gaseous sample. The viscometer operates under computer control and is compatible with submillikelvin temperature control.
Citation
Review of Scientific Instruments
Volume
57
Created August 1, 1986, Updated February 19, 2017