Accession Number:

AD0625043

Title:

INVESTIGATION OF THE PROPERTIES OF HOT PLASMA GASES AND MEASUREMENT OF GAS TEMPERATURES NEAR SOLID SURFACES.

Descriptive Note:

Final scientific rept. 1961-1964,

Corporate Author:

CLARENDON LAB UNIV OF OXFORD (ENGLAND)

Personal Author(s):

• VON Engel,A.

Report Date:

1965-01-28

Pagination or Media Count:

14.0

Abstract:

Studies were made of the methods of gas temperature measurements particularly of a plasma jet where the temperature can be derived from the gas density. One density measurement uses in principle the determination of the range of alpha-particles from a polonium source. Two other methods, one using the Doppler effect of sound and the other using the velocity of a pressure pulse were also discussed. The calorelectric effect was investigated experimentally and theoretically. Its mechanism was suggested supported by measurements of the electron temperature. A study of the ionization in flames led to the conclusion that the electron temperature in flames at atmospheric pressure can exceed markedly that of the neutral gas. As a result of it the large electron concentration in flames may well be caused by electron collisions rather than by a series of processes termed chemi-ionization. The theory of double probes was extended to high gas pressures where the motion of charges is controlled by collision processes such as mobility and diffusion.

Descriptors:

• *PLASMA JETS
• *FLAMES
• TEMPERATURE
• ELECTRONS
• MEASUREMENT
• CALORIMETRY
• GASES
• MOTION
• IONIZATION
• DENSITY
• UNITED KINGDOM

Subject Categories:

• Plasma Physics and Magnetohydrodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE