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Вплив іонізації в пиловому полум’ї частинок алюмінію на розподіл наночастинок Al₂O₃ за розмірами

Year: 2025
Type: article
Abstract: In this review, we present the theoretical investigation results of the coagulation behavior of both neutral and thermally ionized aerosols formed by micro‑dispersed aluminum combustion particles in a dust flame. A mathematical model is proposed to describe particle coagulation in both thermo‑emissive and complex dusty plasma, comprising charged Al₂O₃ particles, electrons, and gas‑phase ions. Particle charges were calculated using the orbital‑motion‑limited (OML) approximation. Ionization equilibrium in the plasma was determined by jointly solving the Saha equations for the gas phase and the charging equation for the particles. The model enabled the study of coagulation dynamics of Al₂O₃ nanoparticles. It was shown that particle charge significantly affects both the characteristic particle size and the width of the size‑distribution function. In thermo‑emission plasma, a strong dependence of particle size and distribution width on temperature was observed. The addition of potassium carbonate to the flame reduced the average Al₂O₃ particle size. Furthermore, increasing the concentration of the ionizing additive resulted in a narrower particle size distribution, approaching monodispersity. The results underscore the importance of accounting for Coulomb interactions in ionized systems for accurate description of the formation of condensed-phase aluminum combustion products in dust flames.
Language: English
Open Access status: green
OpenAlex ID: W7118229149
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