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Entry length for circular and rectangular ducts in strong magnetic fields

J. S. Walker - G. S. S. Ludford

Estimates are presented for entry lengths in circular and rectangular constant-area ducts in the presence of strong transverse magnetic fields, together with the conditions (in terms of the Hartmann number, the interaction number, and the wall conductivity ratio) under which each estimate is valid. As the magnetic field becomes sufficiently strong for inertial effects to be neglected, the entry length becomes comparable to or smaller than the cross-sectional diameter for all rectangular ducts and for highly conducting circular ducts, but remains large for circular ducts with poor wall conductivity.

Magnitnaya Gidrodinamika 11, No. 1, 75-78, 1975 [PDF] (in Russian)
Magnetohydrodynamics 11, No. 1, 59-62, 1975 [PDF, 0.20 Mb]

Copyright: Institute of Physics, University of Latvia
Electronic edition ISSN 1574-0579
Printed edition ISSN 0024-998X