Thermoelectric Corrections on the Energy Transport Across Plasma-Solid Interfaces,
COLORADO STATE UNIV FORT COLLINS DEPT OF ELECTRICAL ENGINEERING
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The amount of plasma energy contained in the free-stream column and stagnation interfaces in direct contact with cooled tungsten electrodes of a direct-current, atmospheric argon arc has been corrected taking into account the thermoelectric effect of a partially ionized plasma. The thermoelectric correction factors to be assessed for the conventional thermal conductivities of fully ionized plasma have been tabulated as a function of the equilibrium temperature of argon at atmospheric pressure. The density diffusion contribution of the thermal conductivity has been calculated. The corrected full-field reduced thermal conductivity has been used for the calculation of the radial temperature profiles corresponding to the axial electron temperatures which were measured by a Thomson scattering experiment. The axial electric field intensity and current density could be determined correctly from the calculated radial temperature profiles and photographic observation of the arc. At the arc-electrode interface the state of plasma is treated by a two-temperature gas model. Comprehensive formula useful for the calculations of both the anode and cathode fall energy transfer modes are presented.
- Plasma Physics and Magnetohydrodynamics