Transitions in a magnetized quasi-laminar spherical Couette Flow

Autor:	Kasprzyk, C., Kaplan, E., Seilmayer, M., Stefani, F.
Rok vydání:	2016
Předmět:	Physics - Fluid Dynamics Astrophysics - Earth and Planetary Astrophysics
Zdroj:	Magnetohydrodynamics, Vol. 53, No. 2, pp. 393-402 (2017)
Druh dokumentu:	Working Paper
Popis:	First results of a new spherical Couette experiment are presented. The liquid metal flow in a spherical shell is exposed to a homogeneous axial magnetic field. For a Reynolds number Re=1000, we study the effect of increasing Hartmann number Ha. The resulting flow structures are inspected by ultrasound Doppler velocimetry. With a weak applied magnetic field, we observe an equatorially anti-symmetric jet instability with azimuthal wave number m=3. As the magnetic field strength increases, this instability vanishes. When the field is increased further, an equatorially symmetric return flow instability arises. Our observations are shown to be in good agreement with linear stability analysis and non-linear flow simulations. Comment: 10 pages, 6 figures, submitted to Magnetohydrodynamics
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1610.02571 Zobrazit plný text záznamu View this record from Arxiv