Accession Number : AD0272082

Title :   A STUDY OF MAGNETOHYDRODYNAMIC INDUCTION DEVICES

Corporate Author : CORNELL UNIV ITHACA N Y

Personal Author(s) : LYONS,J.M. ; TURCOTTE,D.L.

Report Date : FEB 1962

Pagination or Media Count : 1

Abstract : The performance of a laminar-flow induction pump driven by a propagating sinusoidal magnetic field is investigated. It is assumed that the fluid is incompressible with scalar conductivity, that induced magnetic effects are small, that the ratio of channel height to wave length is small,AND THAT THE MAGNETOHYDRODYNAMIC INTERACTION IS LARGE. No assumptions are made concerning the velocity profiles and no components of the magnetic fields are neglected. An inviscid solution containing the first-order perturbations due to induced currents and fringing of the applied magnetic field is obtained. Viscous effects are investigated and found restricted to boundary layers along the channel walls. Therefore, the inviscid results should be applicable to the inner core of a laminar-flow pump. It is concluded that the induced magnetic fields do not affect the performance of the pump to first order. However, the fringing of the magnetic field caused by separation of the pole pieces reduces the pump performance. The efficiency reduction is of the same magnitude as the laminar skin-friction loss. The relative reduction in pressure head is slightly greater than the reduction in efficiency. (Author)

Descriptors :   *ELECTROMAGNETIC PUMPS, *INSTRUMENTATION, *MAGNETOHYDRODYNAMICS, BOUNDARY LAYER, DIFFERENTIAL EQUATIONS, ELECTRICAL CONDUCTIVITY, FLUID FLOW, INDUCTANCE, LAMINAR BOUNDARY LAYER, MAGNETIC FIELDS, PERTURBATION THEORY, VELOCITY, VISCOSITY

Distribution Statement : APPROVED FOR PUBLIC RELEASE