Measurement of Apparent Viscosity of Various Fluids by Using B-Type and Vibration-Type Viscometers

The apparent viscosities of non-Newtonian fluids such as alumina, graphite slurries and carboxymethyl cellulose, starch solutions were measured by using a B-type and a vibration-type viscometers and the measured apparent viscosities were compared to those measured by a coaxial cylinder rotational viscometer, which is an absolute measurement device. It was shown that the measured values of B-type viscometer could be larger or smaller than those of the coaxial cylinder rotational viscometer when measuring various samples including dilatant fluids. It was also found that the difference between the measured viscosities by the coaxial cylinder rotational viscometer and B-type viscometer became larger as the n value determined by curve fitting of the flow curve was apart from 1.0. In addition, it was found that the measured values of the vibration-type viscometer were always extremely smaller than those of the coaxial cylinder rotational viscometer, indicating that the particles or polymers in the sample should not follow the movement of the vibrator. From the extensive measurement of apparent viscosity, we can conclude that the apparent viscosities measured not by the vibration-type viscometer but by B-type viscometer has a good connection with those measured by the coaxial cylinder rotational viscometer.