Suppression of Cross-Field Transport of a Passive Scalar in Two-Dimensional Magnetohydrodynamic Turbulence
P.H. Diamond, A.V. Gruzinov (Department of Physics 0319, University, of California, San Diego, La Jolla, CA, USA)
TL;DR
This paper extends passive scalar transport theory to 2D MHD turbulence, revealing a magnetic pinch effect that significantly suppresses cross-field scalar transport while leaving parallel transport unaffected.
Contribution
It introduces a novel magnetic pinch mechanism in 2D MHD turbulence that reduces cross-field scalar transport, expanding understanding of passive scalar behavior in magnetofluids.
Findings
Cross-field scalar transport is drastically reduced by the magnetic pinch effect.
Transport parallel to the magnetic field remains unchanged.
The theory generalizes passive scalar transport to magnetohydrodynamic turbulence.
Abstract
The theory of passive scalar transport in two dimensional turbulent fluids is generalized to the case of 2D MHD. Invariance of the cross correlation of scalar concentration and magnetic potential produces a novel contribution to the concentration flux. This pinch effect is proportional to the mean potential gradient, and is shown to drastically reduce transport of the passive scalar across the mean magnetic field when . Transport parallel to the mean magnetic field is unchanged. Implications for models of transport in turbulent magnetofluids are discussed. PAC NOS. 47.25.Jn, 47.65.+a
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Taxonomy
TopicsFluid Dynamics and Turbulent Flows · Solar and Space Plasma Dynamics · Meteorological Phenomena and Simulations