2球間クエット超臨界流における非一意性

概要

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Non-uniqueness of supercritical flow has been experimentally considered in the spherical Couette system with only the inner sphere rotating. The types, wavenumbers and fundamental frequencies of the disturbances, which appear in the quasi-static transitions started from three different initial flow states with zero, two or four toroidal Taylor-Gortler (TG) vortices and in different flow histories, respectively, have been investigated by the simultaneous spectral and flow visualization measurements. The type and wavenumber of the disturbance are found to depend on the number N of the toroidal TG vortices. The wave speed of travelling azimuthal waves is independent of N in the range of reduced Reynolds number R* of 1.77≦R*<lsime>2.1, but not in the other R* ranges. The wave speed of shear waves is almost independent of R*, but depends on N. As for the history of the travelling wave speed, the initial state with four vortices makes a closed hysteresis loop, but the one with two vortices does not.
一般社団法人日本機械学会の論文
1989-09-25