Start Date
4-1969 8:00 AM
Description
Activities in magnetohydrodynamic power, high enthalpy wind tunnels and arc-jet engines require information and methods of calculating such properties as temperature profiles and conductivity with a plasma. While techniques are available to measure plasma temperature and electron density, no reliable formula has been available to utilize these measurements to determine plasma conductivity. An expression for electrical conductivity in low electron density plasmas has been derived, as has an expression for completely ionized gases. Neither of these expressions is appropriate to the area of current interest, moderately ionized plasmas. Extrapolation techniques have been ineffective. A new approach, based upon the work of DemetriadesandArgyropoulos, utilizing a generalized Ohm's Law, was tested and found to conform most closely to experimental results. Since the validity of the experimental results are suspect, and more work should be done, the experimental work is described in some detail for the benefit of other experimentors.
Comparison of Measured and Theoretical Values of Electrical Conductivity in a Low Density Plasma
Activities in magnetohydrodynamic power, high enthalpy wind tunnels and arc-jet engines require information and methods of calculating such properties as temperature profiles and conductivity with a plasma. While techniques are available to measure plasma temperature and electron density, no reliable formula has been available to utilize these measurements to determine plasma conductivity. An expression for electrical conductivity in low electron density plasmas has been derived, as has an expression for completely ionized gases. Neither of these expressions is appropriate to the area of current interest, moderately ionized plasmas. Extrapolation techniques have been ineffective. A new approach, based upon the work of DemetriadesandArgyropoulos, utilizing a generalized Ohm's Law, was tested and found to conform most closely to experimental results. Since the validity of the experimental results are suspect, and more work should be done, the experimental work is described in some detail for the benefit of other experimentors.
Comments
No other information or file available for this session.