Tayler instability of toroidal magnetic fields in MHD Taylor-Couette flows

Details Tayler instability of toroidal magnetic fields in MHD Taylor-Couette flows Tayler instability of toroidal magnetic fields in MHD Taylor-Couette flows

2009-03-23

arxiv.org/abs/0903.3831v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

9 pages, 11 figures, subm

Scientific paper

The nonaxisymmetric 'kink-type' Tayler instability (TI) of toroidal magnetic fields is studied for conducting incompressible fluids of uniform density between two infinitely long cylinders rotating around the same axis. It is shown that for resting cylinders the critical Hartmann number for the unstable modes does not depend on Pm. By rigid rotation the instability is suppressed where the critical ratio of the rotation velocity and the Alfven velocity of the field (only) slightly depends on the magnetic Prandtl number Pm. For Pm=1 the rotational quenching of TI takes its maximum. Rotation laws with negative shear (i.e. d\Omega/dR<0) strongly destabilize the toroidal field if the rotation is not too fast. For sufficiently high Reynolds numbers of rotation the suppression of the nonaxisymmetric magnetic instability always dominates. The angular momentum transport of the instability is anticorrelated with the shear so that an eddy viscosity can be defined which proves to be positive. For negative shear the Maxwell stress of the perturbations remarkably contributes to the angular momentum transport. We have also shown the possibility of laboratory TI experiments with a wide-gap container filled with fluid metals like sodium or gallium. Even the effect of the rotational stabilization can be reproduced in the laboratory with electric currents of only a few kAmp.

Affiliated with

Also associated with

No associations

Rating

Tayler instability of toroidal magnetic fields in MHD Taylor-Couette flows does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Tayler instability of toroidal magnetic fields in MHD Taylor-Couette flows, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tayler instability of toroidal magnetic fields in MHD Taylor-Couette flows will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-346429