空気吸込渦の発生を示す新たな係数の提案

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This paper describes air-entraining vortices generated when water is drained from a vessel. The liquid used in this experiment is a mixture of water and bentonite. By changing the mixing ratio, the coefficients of kinematic viscosity of the liquid were changed to six values ranging from 0.015 to 0.0625 cm^2/s. Air-core vortices and vortices without air core are not generated in liquid deeper than a certain depth. In the scope of this experiment, this depth increased with the increase of flow quantity. Also, it was found that vortices were not generated at the value of the radial Reynolds number Rr derived from the equation of motion lower than a certain value. For example, in liquids having the coefficients of kinematic viscosity, υ=0.0105 and 0.0652 cm^2/s, air-entrained vortices are not generated at Rr < 3000 for the former and Rr < 800 for the latter. Although the inner diameters of effluent pipes were 2.03, 3.23, and 5.15 cm, effects of the difference were hardly found. However, it was found that the values of Rr in this limit were reduced as the viscosity of liquids increased.
一般社団法人日本機械学会の論文
1993-03-25