EXPERIMENTS ON JOULE HEATING OF SHOCK-IONIZED AIR.
BROWN UNIV PROVIDENCE R I DIV OF ENGINEERING
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The heating of ionized air by means of low voltage d.c. discharge between cold, plane electrodes is controlled primarily by the thermal boundary layers adjacent to the electrodes. In shock-ionized air at 6700-7800K and 10-20 atm three characteristic domains of discharge intensity are estimated experimentally. Below 1 kWsq cm the thermal boundary layer thickness is nondecreasing in time. Between 1 and 100 kWsq cm the thickness decreases with no significant heating effect in the outer region within a practically short time. Above 100 kWsq cm boundary layer shrinks very rapidly, an immediate heating of the free gas follows. The total Joule heat rate in the outer region becomes comparable with that in the boundary layer only in the strong discharges where the current density is of the order of 1000 Asq cm. Author
- Electricity and Magnetism
- Plasma Physics and Magnetohydrodynamics