Method and apparatus for obtaining rheological properties of non-Newtonian fluids

摘要

A rheological property value of a non-Newtonian fluid is obtained. SOLUTION: A preparatory step of preparing three or more conditions in which at least one of a radius Rp of a pipe or a flow rate Q of a non-Newtonian fluid flowing through the pipe is different, and one point of the pipe and a non-Newtonian fluid from one point in the condition. Information acquisition step of acquiring information about the pressure difference ΔP of the non-Newtonian fluid between another point that is separated by a distance L on the downstream side of the flow, and the radius Rp, the flow rate Q, the distance L, and the pressure difference ΔP in the condition. And a calculation step of calculating three rheological characteristic values of the viscosity coefficient K, the viscosity index n, and the yield stress σ0 from the following equations (1) and (2). (In the formula (1), m is a constant) [Selection diagram] Fig. 1