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Turbulent transport of momentum and heat in magnetohydrodynamic rectangular duct flow with strong sidewall jets
This paper presents an experimental study of the momentum and heat transport in a turbulent magnetohydrodynamic duct flow with strong wall jets at the walls parallel to the magnetic field. Local turbulent flow quantities are measured by a traversable combined temperature-potential-difference probe....
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Published in: | Journal of fluid mechanics 2000-03, Vol.406, p.247-279 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that cite this one |
Online Access: | Get full text |
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Summary: | This paper presents an experimental study of the momentum and heat transport in a
turbulent magnetohydrodynamic duct flow with strong wall jets at the walls parallel
to the magnetic field. Local turbulent flow quantities are measured by a traversable
combined temperature-potential-difference probe. The simultaneous measurements of
time-dependent velocity and temperature signals facilitates the evaluation of Reynolds
stresses and turbulent heat fluxes. Integral quantities such as pressure drop and temperature
at the heated wall are evaluated and compared with results from conservative
design correlations. At strong enough magnetic fields the destabilizing effect of strong
shear generated at the sidewalls wins the competition with the damping effect by
Joule's dissipation and turbulent side layers are created. Due to the strong non-isotropic character of the electromagnetic forces, the turbulence structure is characterized
by large-scale two-dimensional vortices with their axis aligned in the direction
of the magnetic field. As most of the turbulent kinetic energy is concentrated in the
near-wall turbulent side layers, the temperatures at the heated wall are governed by
the development of the thermal boundary layer in the turbulent flow. |
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ISSN: | 0022-1120 1469-7645 |
DOI: | 10.1017/S0022112099007405 |