WELDING FUMES FORMATION. IV. FORMATION OF FINAL AGGLOMERATES.
Journal Title: Физика аэродисперсных систем - Year 2014, Vol 0, Issue 51
Abstract
The dusty plasma behavior is studied in the process of coagulation of the primary particles, which are formed as a result of the nucleation and nuclei growth in the condensable hightemperature vapors. The study is concentrated to the example of the thermal plasma formed in the welding fume in the arc welding process where the electrodes covered with carbonatefluorite are used. The tendency to self-organization of such a plasma and formation of the ordered spatial structures of primary particles is demonstrated. The number densities of the primary particles in these structures are much higher than at uniform spatial distribution that causes the rapid coagulation of the fine nano-sized primary particles. The coagulation of the particles with size more 10 nm into cluster-like agglomerates occurs during almost all cooling period of aerosol up to the ambient air temperature. The coagulation of the ultra-fine particles (~2 nm) occurs in two stages: at first the chain-like agglomerates are formed rapidly, and then they associate with the cluster-like agglomerates. As a result, the final agglomerates (inhalable particles) have the bimodal size distribution.
Authors and Affiliations
V. I. Vishnyakov, S. A. Kiro, M. V. Oprya, A. A. Ennan
Keywords
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