期刊
PHYSICAL REVIEW LETTERS
卷 108, 期 15, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.154502
关键词
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资金
- U.S. Department of Energy's Office of Sciences [DE-AC02-09CH11466]
- U.S. National Science Foundation [AST-0607472, PHY-0821899]
- U.S. National Aeronautics and Space Administration (NASA) [APRA08-0066, ATP06-35]
We report on observations of a free-Shercliff-layer instability in a Taylor-Couette experiment using a liquid metal over a wide range of Reynolds numbers, Re similar to 10(3)-10(6). The free Shercliff layer is formed by imposing a sufficiently strong axial magnetic field across a pair of differentially rotating axial end cap rings. This layer is destabilized by a hydrodynamic Kelvin-Helmholtz-type instability, characterized by velocity fluctuations in the r-theta plane. The instability appears with an Elsasser number above unity, and saturates with an azimuthal mode number m which increases with the Elsasser number. Measurements of the structure agree well with 2D global linear mode analyses and 3D global nonlinear simulations. These observations have implications for a range of rotating MHD systems in which similar shear layers may be produced.
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