Topical report on insulating wall boundary layer in a Faraday MHD generator

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Abstract
An experimental and analytical investigation has been undertaken of the insulating wall boundary layer in a Faraday MHD generator. The present investigation of the insulating wall boundary layer has shown that modifications due to MHD effects can have a very significant influence on the insulating wall friction and heat transfer in a Farady MHD generator. The modified flow, called extended Hartmann flow, is evidenced by an alteration of the velocity profile due to the variation of the vector J x vector B force across the channel in the magnetic field direction. The non-uniform current distribution is related to variations in both the velocity and the electrical conductivity across the channel. Turbulence damping was also included in the present work as the laser anemometer measurements provided direct measurement of this effect. The analytic model involved the computer solution, using finite difference techniques, of the momentum, energy, and electrical equations including MHD effects for the turbulent insulating wall boundary layer. The experimental study consisted of the measurement of the velocity profile at the center of the insulating wall in an MHD generator using a laser anemometer.

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