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- W2158642011 abstract "Turbulence measurements under the influence of a transverse magnetic field have been made at Purdue University's Magneto-Fluid-Mechanic Laboratory in a high aspect ratio channel. The Reynolds number range covered was 25000 ≤ Re 282000; the geometry and experimental conditions were such that the experiment approximated turbulent Hartmann flow. The aspect ratio of the channel was 5·8:1, its walls were electrically insulated and the working fluid was mercury. Measurements in the presence of a magnetic field were made of the skin friction coefficient, the mean velocity profiles, the turbulence intensity profiles (both u ’ and v ’) and the Reynolds stress profiles. A sudden change in the damping of the Reynolds stresses was manifested by a ‘hump’ in the curves of C f versus M/Re taken with the Reynolds number held constant. This ‘hump’ occurs as a gentle rise and sudden drop to the Hartmann laminar line of the C f data. Close examination of the $overline{u^{prime}v^{prime}}$ data near the wall confirms this behaviour, indicating that the turbulent contribution to the shear stress is the controlling factor in this behaviour of C f . The Reynolds stresses were completely suppressed to zero at high values of the magnetic field, though the turbulence intensities of u ’ and v ’ were not. The Reynolds stress data are fundamental in revealing the mechanisms which are at work during the suppression of turbulence by a magnetic field. It was also found that at high magnetic fields, when most of the turbulence was damped, the skin friction coefficient fell below the values predicted by Hartmann's (1937) laminar solution for high values of M/Re . This result was linked to the presence of ‘M-shaped’ velocity profiles in the direction perpendicular to both the magnetic field and the mean velocity vector. The presence of ‘M-shaped’ profiles has not previously been linked to a reduction in C f ." @default.
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- W2158642011 date "1978-11-14" @default.
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- W2158642011 title "The effect of a transverse magnetic field on shear turbulence" @default.
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- W2158642011 doi "https://doi.org/10.1017/s0022112078002517" @default.
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