Abstract A model of combustion of aluminum nanopowder in water vapor has been analyzed with allowance for the formation of a condensed phase of aluminum oxide on aluminum particles. Various processes affecting the growth rate of the oxide coating have been considered including adsorption and surface diffusion of Al2O3 molecules on aluminum particles, and condensation of the molecules on the oxide coating. Model calculations have yielded the time profiles of system temperature, phase and fractional composition, as well as the shape of oxide coated aluminum particles. The heterogeneous processes forming the condensed phase of aluminum oxide on Al particles have shown to increase heat generation in the system. On the other hand, shielding aluminum particles by oxide coating retards aluminum evaporation. The competition of these processes during the formation of oxide coating is one of the factors affecting the combustion of aluminum nanopowder in water vapor.

中文翻译：

---

在蒸汽中燃烧的铝纳米颗粒上形成的氧化物涂层对燃烧的影响

摘要 分析了铝纳米粉在水蒸气中的燃烧模型，并考虑到铝颗粒上氧化铝凝聚相的形成。已经考虑了影响氧化物涂层生长速率的各种过程，包括Al2O3分子在铝颗粒上的吸附和表面扩散，以及分子在氧化物涂层上的凝聚。模型计算得出了系统温度、相和组分组成的时间曲线，以及氧化物涂层铝颗粒的形状。在铝颗粒上形成氧化铝凝聚相的非均相过程表明会增加系统中的热量产生。另一方面，通过氧化物涂层屏蔽铝颗粒会阻止铝蒸发。