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A solid-liquid two-phase fluid was stirred by a rotating vane in a tank and it was pushed out by a piston through a pipe. There were differences between the volume concentration of particle phase of outflow and that set in a tank even when the specific gravity of fluid phase was arranged carefully to have the same value as particle phase. It became clear that the volume concentration ratios began to decrease linearly as a non-dimensional parameter expressed by the product of the velocity ratio and the diameter ratio increased. Now the volume concentration ratio meant the ratio of the volume concentration of particle phase of outflow and that set in a tank and the velocity ratio meant the ratio of the velocity caused by a rotating vane near the entrance of outlet pipe in a tank and the average velocity in a outlet pipe and the diameter ratio meant the ratio of the average diameter of particles and the diameter of an outlet pipe. These phenomena could be understood if we assumed that the fluid flowing in the layer between the wall and the plane apart a particle radius from the wall had no volume concentration of particle phase. Under this assumption the total volume concentration of outflow was calculated by using potential flow models, and it was found to agree with the experimental results fairly well. These phenomena could be considered to appear also in branch pipe flow, although they would become more complicated by the effects of boundary layer and non-uniform particle distribution. For example the flat shape of red blood corpuscle would contribute to reduce the effects of these phenomena and to increase the number of them in capillaries.

nihon kikai gakkai ronbunshū. b

Volume Concentration of Solid-Liquid Two-Phase Fluid Flowing out of Tank with Stirring Equipment (In the Case of Two-Phase Fluid Containing Solid Spherical Particles with Same Specific Gravity as Fluid Phase)