VOLUMETRIC ABSORPTION IN GAS - PROPERTIES OF PARTICLES AND PARTICLE-GAS SUSPENSIONS

This paper deals with the volumetric absorption of solar radiation in particle-gas suspensions. The optical properties of different carbonac eous particles in connection with solar radiation on the basis of Mie' s scattering theory are discussed. An efficiency factor for reflection was introduced to determine the solar radiation scattered backwards i n a hemispherical angle towards the source of radiation. Projections o f the relevant optical properties of individual small particles of bla ck and brown coal, anthracite, carbon black and coke are illustrated a nd compared. Extinction experiments were performed and are presented, and experimental and theoretical results are compared. Some practical experiences of particle production and particle-gas suspension charact eristics are presented. The results of experiments and analysis show w hich substances and particle sizes are most appropriate for the absorp tion of solar radiation in particle-gas suspensions. Copyright (C) 199 6 Elsevier Science Ltd.