Das Temperatur-und Strömungsfeld in einem wandstabilisierten, magnetisch abgelenkten Bogen

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Abstract
The influence of the Lorentz forces -caused by a stationary transverse uniform magnetic field -and the thereby induced flow field on a wall-stabilized electric arc in argon is experimentally investigated. The unsymmetrical temperature fields in the arc discharge cross-section for different values of arc current and magnetic field are determined by measuring the continuum radiation absolutely. The material functions of argon are taken from recently published literature; the specific radiation u(T) is evaluated from our measurements. The convective term of the energy equation provides the component of the flow velocity parallel to grad T; herefrom, together with the continuity equation, the flow field is calculated. The evaluation of the momentum equation shows that within the main part of the arc-cross-section the Lorentz force is essentially compensated by a pressure gradient and not by inertial or viscous forces. The consistency of the results verifies the measurements, the applied material functions and the evaluation procedures.

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