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<p>The authors have presented the results of numerical simulation of the nucleation of a supersaturated silica vapor and the growth of the clusters formed in a flow gas reactor. The nucleation kinetics was calculated on the basis of the idea of the decisive role of triple molecular collisions. It has been shown that at high supersaturations of the vapor, the nucleation is nonisothermal in character. In particular, the release of the latent heat of phase transition increases substantially (by hundreds of Kelvin degrees) the temperature of the gas mixture. This effect slows down the rate of growth of the clusters at a high supersaturation of the vapor. It has been predicted that the deposition of nanometer clusters onto a melt from a high-temperature laminar gas flow upon its radiative cooling proceeds with the aid of Brownian diffusion.</p>

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Nonisothermal Formation of SiO2 Clusters from the Gas Phase

  • 期刊论文

  • 发表日期：

    2026年1月1日

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  • E. S. Demukh,
  • S. P. Fisenko

摘要

The authors have presented the results of numerical simulation of the nucleation of a supersaturated silica vapor and the growth of the clusters formed in a flow gas reactor. The nucleation kinetics was calculated on the basis of the idea of the decisive role of triple molecular collisions. It has been shown that at high supersaturations of the vapor, the nucleation is nonisothermal in character. In particular, the release of the latent heat of phase transition increases substantially (by hundreds of Kelvin degrees) the temperature of the gas mixture. This effect slows down the rate of growth of the clusters at a high supersaturation of the vapor. It has been predicted that the deposition of nanometer clusters onto a melt from a high-temperature laminar gas flow upon its radiative cooling proceeds with the aid of Brownian diffusion.