The stratorotational instability of Taylor-Couette flows with moderate Reynolds numbers
The stratorotational instability of Taylor-Couette flows with moderate Reynolds numbers
复制标题
中等雷诺数泰勒-库埃特流的平转不稳定性
DOI:
10.1080/03091929.2017.1382487
复制
发表时间:
2017
影响因子:
1.3
通讯作者:
U. Harlander
中科院分区:
文献类型:
--
作者:
G. Rüdiger;T. Seelig;M. Schultz;M. Gellert;C. Egbers;U. Harlander
In view of new experimental data the instability against adiabatic nonaxisymmetric perturbations of a Taylor-Couette flow with an axial density stratification is considered in dependence of the Reynolds number () of rotation and the Brunt-Väisälä number (Rn) of the stratification. The flows at and beyond the Rayleigh limit become unstable between a lower and an upper Reynolds number (for fixedRn). The rotation can thus be too slow or too fast for the stratorotational instability. The upper Reynolds number above which the instability decays, has its maximum value for the potential flow (driven by cylinders rotating according to the Rayleigh limit) and decreases strongly for flatter rotation profiles finally leaving only isolated islands of instability in the () map. The maximal possible rotation ratioonly slightly exceeds the shear value of the quasi-uniform flow withconst. Along and between the lines of neutral stability the wave numbers of the instability patterns for all rotation laws beyond the Rayleigh limit are mainly determined by the Froude numberwhich is defined by the ratio betweenandRn. The cells are highly prolate forso that measurements for too high Reynolds numbers become difficult for axially bounded containers. The instability patterns migrate azimuthally slightly faster than the outer cylinder rotates.
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1968
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