Radiant Heat Transfer from Luminous Flame : 1 st Report, Theoretical and Experimental Studies on the Uniform-Temperature and-Volume Fraction

Abstract

In this paper, the radiant heat transfer from a luminous flame is treated theoretically and experimentally, from the view point that the radiation from a cloud of carbon particles is most effective. In the case where only the cloud of luminous carbon particles under uniform temperature and uniform volume fraction is concerned with radiation, the relation between the total emissivity and X has been found, where X is the function of volume fraction, thickness and temperature of flame. And the calculated value agrees well with the Schack's results. Next, in the luminous flame, the relation between the total emissivity and X, has been found. Moreover, experimentally the relation between the emissivity of a luminous flame and X in the luminous flame which was formed artificially by inserting the carbon particles in a nonluminous flame, has been made clear by means of an optical pyrometer and a radiation pyrometer. The result of studies showed that the experimental values agreed with the above mentioned theoretical analysis.