Abstract

The procedures and results of an experimental program to record and analyze thermal radiation from particles suspended in a gaseous flow (two-phase flow) are presented. Small carbon particles (0.5-μm mean diam) were added to a nitrogen gas stream at temperatures of 800–900 K flowing at ~50 m/sec. Thermal radiation from these particles was observed and recorded using a scanning monochromator for the wavelength range of 1.5–5.0 μm. Spectra were corrected for instrument response and are compared to theoretical calculations which predict emission from small particles. Parameters in the calculations such as temperature, refractive index, and particle size distribution were varied over experimental error bounds, and good agreement was obtained between the observed spectra and predictions based on Mie theory and the Planck equation.

© 1984 Optical Society of America

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