Suppression of turbulent resistivity in turbulent Couette flow
| Autor: | David J. Westpfahl, Arthur S. Colgate, Stirling A. Colgate, Hui Li, Jiahe Si, Joe Martinic, V. Romero, Mark Nornberg, Richard Sonnenfeld |
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| Rok vydání: | 2015 |
| Předmět: |
Physics
Turbulent diffusion Turbulence Reynolds number Mechanics Condensed Matter Physics 01 natural sciences 010305 fluids & plasmas Physics::Fluid Dynamics symbols.namesake Classical mechanics 0103 physical sciences symbols Differential rotation Mean flow Magnetohydrodynamics 010306 general physics Shear flow Couette flow |
| Zdroj: | Physics of Plasmas. 22:072304 |
| ISSN: | 1089-7674 1070-664X |
| DOI: | 10.1063/1.4926582 |
| Popis: | Turbulent transport in rapidly rotating shear flow very efficiently transports angular momentum, a critical feature of instabilities responsible both for the dynamics of accretion disks and the turbulent power dissipation in a centrifuge. Turbulent mixing can efficiently transport other quantities like heat and even magnetic flux by enhanced diffusion. This enhancement is particularly evident in homogeneous, isotropic turbulent flows of liquid metals. In the New Mexico dynamo experiment, the effective resistivity is measured using both differential rotation and pulsed magnetic field decay to demonstrate that at very high Reynolds number rotating shear flow can be described entirely by mean flow induction with very little contribution from correlated velocity fluctuations. |
| Databáze: | OpenAIRE |
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