تقرير
Observation of a Free-Shercliff-Layer Instability in Cylindrical Geometry
| العنوان: | Observation of a Free-Shercliff-Layer Instability in Cylindrical Geometry |
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| المؤلفون: | Roach, Austin, Spence, Erik, Gissinger, Christophe, Edlund, Eric, Sloboda, Peter, Goodman, Jeremy, Ji, Hantao |
| المصدر: | A.H. Roach, E.J. Spence, C. Gissinger, E.M. Edlund, P. Sloboda, J. Goodman, and H. Ji, Phys. Rev. Lett. 108, 154502 (2012) |
| سنة النشر: | 2012 |
| المجموعة: | Astrophysics Physics (Other) |
| مصطلحات موضوعية: | Physics - Fluid Dynamics, Astrophysics - Instrumentation and Methods for Astrophysics |
| الوصف: | 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, $Re\sim 10^3-10^6$. The free Shercliff layer is formed by imposing a sufficiently strong axial magnetic field across a pair of differentially rotating axial endcap 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. Comment: 5 pages, 4 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevLett.108.154502 |
| URL الوصول: | http://arxiv.org/abs/1204.6339 |
| رقم الأكسشن: | edsarx.1204.6339 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevLett.108.154502 |
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