Magnetohydrodynamic buoyancy-driven turbulence in thermally stratified conducting flow

Journal Article · Thu Aug 01 04:00:00 EDT 1991 · Physics of Fluids B; (USA)

DOI:https://doi.org/10.1063/1.859633· OSTI ID:5745417

Khait, V D ^[1]

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1. Cornell University Medical College, New York, New York 10021 (US)

Magnetohydrodynamic (MHD) buoyancy-driven instability has much in common with gravity-driven natural convection instability in thermally stratified fluids, in that account must be taken of the temperature dependence of conductivity in the former case and of density in the latter case. Employing the Monin--Obukhov theory of mixed convection in a stratified atmosphere, temperature and velocity profiles in MHD turbulent shear flow are obtained. The problem of the boundary-layer development is solved, and the heat and momentum fluxes are found. It is shown that the buoyancy force effects drastically change the fluxes when the Stuart number exceeds unity. Anode--cathode asymmetry observed experimentally on MHD devices is explained.

• OSTI ID: 5745417
• Journal Information: Physics of Fluids B; (USA), Journal Name: Physics of Fluids B; (USA) Vol. 3:8; ISSN 0899-8221; ISSN PFBPE
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
300100* -- Direct Energy Conversion-- MHD Generators
ANODES
ASYMMETRY
BOUNDARY LAYERS
CATHODES
CONVECTIVE INSTABILITIES
DIRECT ENERGY CONVERTERS
EARTH ATMOSPHERE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRODES
ENERGY
FLUID MECHANICS
HEAT
HYDRODYNAMICS
INSTABILITY
LAYERS
MAGNETOHYDRODYNAMICS
MECHANICS
MHD GENERATORS
MOMENTUM TRANSFER
PHYSICAL PROPERTIES
PLASMA DRIFT
PLASMA INSTABILITY
SHEAR
STRATIFICATION
TEMPERATURE DEPENDENCE
TEMPERATURE EFFECTS
TURBULENCE