On the magnetoaerothermal instability

Demetriades, S. T.; Oliver, D. A.; Swean, T. F.; Maxwell, C. D.

doi:10.2514/6.1981-248

Cited by 8 publications

(2 citation statements)

References 3 publications

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“…This is not remarkable in view of the fact that the experiments were designed to suppress the Faraday current while imposing a Hall current. I n the magnetoaerothermal case the Hall current is driven by the conductivity non-uniformity encountered by the Faraday current ; this non-uniformity is then amplified by secondary flows driven by the Hall current (Demetriades et al 1981). In the present experiments the local Hall current is still coupled to secondary flow, but the regulation of the total Hall current may have precluded the emergence of an instability.…”

Section: Mean Axial Velocitymentioning

confidence: 58%

“…The calculated magnitude of these flows for a commercial-scale device ranges from 10-30 % of the bulk velocity, depending on conditions, and the predicted consequences voltage drops. I n addition Demetriades et al (1981) predicted that these secondary flows could lead to magnetoaerothermal instabilities, which could include boundarylayer separation and/or electric-field breakdown near the electrodes.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study of secondary flow in a magnetohydrodynamic channel

Girshick

Kruger

1986

J. Fluid Mech.

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The Hall effect in the magnetohydrodynamic (MHD) channel flow of a plasma leads to the presence of transverse Lorentz forces. The non-uniform distribution of these body forces may cause secondary flows to develop; these can exert a significant influence on the plasma momentum, thermal and electrical behaviour. The effect is predicted to be large for envisioned large-scale MHD devices. An experimental study of this phenomenon is described. The apparatus consisted of a laboratory-scale MHD channel in which a controlled net axial current was applied. Plasma velocities were measured using laser-Doppler anemometry. The results demonstrate that transverse Lorentz forces can drive intense secondary flows at a value of the magnetic interaction parameter based on the Hall current of approximately one. The peak measured transverse velocities were 15% of the bulk velocity. Qualitatively, the basic character of the large-scale secondary flow structure was in accord with a simple model based on a first-order distribution of the axial current density. Measurements were also made under a variety of conditions of the profiles of mean axial velocity and of the axial and transverse components of turbulence intensity, of electrode surface temperatures and of plasma voltage distributions. These results all support the conclusion that convective transport by MHD secondary flow caused significant asymmetries to develop in the cross-plane distribution of scalar quantities.

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Section: Mean Axial Velocitymentioning

confidence: 58%

Section: Introductionmentioning

confidence: 99%