U字管内振動を用いた擬塑性流体の構造粘度指数と擬塑性粘度の決定法
1989 年 58 巻 3 号 p. 452-456
詳細
1989 年 58 巻 3 号 p. 452-456
It cannot be said that the unsteady flow of non-Newtonian fluid in a pipe has been sufficiently studied. This paper describes the results of the comparison between the analytical calculations and experimental observations of the pendulation of a pseudo-plastic fluid column in an open vertical U-tube. The method is to estimate the values of the coefficient K and index n of the pseudo-plastic flow equation of Ostwald de Waeles model. It is found that the parameters K and n can be estimated with an accuracy of 1% and 2%, respectively, by choosing their values so that the oscillating motion of the fluid calculated analytically using these values come closest to the motion observed experimentally.
