화학공학소재연구정보센터
Chemical Engineering & Technology, Vol.23, No.3, 214-218, 2000
Generation of fine solid particles by desublimation in a subsonic nozzle expansion
The generation of fine solid particles by heterogeneous desublimation of succinic acid vapor is investigated experimentally and theoretically. In the experimental investigations a gas mixture consisting of air and succinic acid vapor is cooled due to a subsonic nozzle expansion and direct cooling by mixing. As a result of the cooling process, the gas mixture is supersaturated and the succinic acid vapor desublimes to fine particles. The number concentrations and particle size distributions of the generated powders are measured with an optical particle counter. The particle growth by desublimation is calculated with an Eulerian-Eulerian approach in a two-dimensional now field. The population balance for the particle size distribution is solved and the mass and energy balance equations for each particle class are implemented in a CFD program (CFX 4.2).