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

摘要

Provided is a method/device for using the concept of shear rate propagation constant to evaluate the range of the shear rate of a fluid when evaluating the physical properties of the fluid. With regard to a viscosity measuring device that inserts an oscillator (1) into a fluid being measured, oscillates the oscillator (1), and measures the viscosity of the fluid from the amplitude changes of the oscillator (1), the present invention has a density measuring step (S1) for measuring the density of the fluid, a viscosity measuring step (S2) for measuring the viscosity of the fluid, an angular frequency calculating step (S3) for calculating the angular frequency of the oscillator, and a propagation constant calculating step (S4) for calculating a shear rate propagation constant (Z) from formula (1). The range of the shear rate applied to the fluid from the oscillator (1) is evaluated as larger the larger the shear rate propagation constant (Z).