METHOD FOR EVALUATING RANGE OF SHEAR RATE ACTING ON FLUID, AND PROGRAM AND DEVICE FOR SAME

摘要

To provide a method and an apparatus for evaluating a reachable range of a shear rate of a fluid by using a concept of a shear rate propagation constant in evaluating the properties of the fluid. The apparatus for measuring a viscosity in which a vibrator (1) dunked in the fluid and to be measured is vibrated for measuring the viscosity by means of an amplitude change which is influenced by a viscosity resistance of the fluid includes a step (S1) of measuring a fluid density, a step (S2) of measuring the fluid viscosity, a step (S3) of calculating an angular frequency of the vibrator, and a step (S4) of calculating a shear rate propagation constant “Z” from Equation (1), wherein increase of the shear rate propagation constant “Z” is evaluated as increase of a reachable range of the shear rate applied to the fluid from the vibrator (1).