EXPERIMENTS ON JOULE HEATING OF SHOCK-IONIZED AIR.

Abstract

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 kW/sq cm the thermal boundary layer thickness is nondecreasing in time. Between 1 and 100 kW/sq cm the thickness decreases with no significant heating effect in the outer region within a practically short time. Above 100 kW/sq 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 A/sq cm. (Author)

Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1966
Accession Number
AD0637502

Entities

People

  • Suha Selamoglu

Organizations

  • Brown University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Boundaries
  • Boundary Layer
  • Current Density
  • Electrodes
  • Intensity
  • Layers
  • Low Voltage
  • Thermal Boundary Layer
  • Thickness
  • Voltage

Fields of Study

  • Physics

Readers

  • Mathematics or Statistics
  • Plasma Physics.
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).