Abstract
The evolution of the ultrafine coagulating, coalescing aerosol in laminar, isothermal, and nonisothermal coaxial jets was studied in computer “experiments.” Four processes affect the aerosol particle size distribution for both the isothermal and the nonisothermal jets. These are axial and radial convection, Brownian coagulation, and Brownian diffusion. The additional process of thermophoresis is important in the nonisothermal jet. At the particle concentration levels studied, most of the change in aerosol characteristics occurs within axial distances of the order of 100 nozzle diameters. Also, bimodal number and mass density functions are found at the periphery of the jet near the nozzle. Characteristic times for the various processes occurring in the laminar jet are defined and used qualitatively to generalize specific results given in the paper.
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