Accession Number : AD0430031

Title :   STAGNATION POINT HEATING IN IONIZED MONATOMIC GASES,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE FLUID MECHANICS LAB

Personal Author(s) : Reilly,James P.

Report Date : JUN 1963

Pagination or Media Count : 27

Abstract : The measurements made of the heat transfer to the stagnation point of a cylinder in partially ionized monatomic gases, and assesses the effect of free electrons on the total gas thermal con ductivity are reported. Shock-heated argon and xenon were used as the test media, thus bypassing the dissociation phase present in diatomic gas heat transfer, and passing directly from the ideal gas to the ionized gas. Comparison of the experimental data is made with two real-gas estimates, the first including the effects of ionization only on the thermodynamic properties involved, and a second including the effects of ionization on both the thermodynamic and transport properties. The experimental results are in substantial agreement with the latter prediction where equilibrium is attained, and confirms the prediction of an increased gas thermal conductivity due to the presence of free electrons. An estimate of the contribution of radiative heating is made both numerically and experimentally, and found to be less than 10% of the aerodynamic heating for the test conditions. The test gas is shown to be in thermochemical equilibrium under those conditions where ionization is significant. (Author)

Descriptors :   (*GAS IONIZATION, TRANSPORT PROPERTIES), (*HEAT TRANSFER, GASES), (*STAGNATION POINT, HEATING), CYLINDRICAL BODIES, THERMAL CONDUCTIVITY, ARGON, XENON, TEST EQUIPMENT, TRANSPORT PROPERTIES, COOLING, TEMPERATURE, THERMODYNAMICS, MEASUREMENT, DIFFUSION

Distribution Statement : APPROVED FOR PUBLIC RELEASE