Effects of entrainment and agglomeration of particles on combustion of nano-aluminum and water mixtures

Dilip Srinivas Sundaram, Vigor Yang

研究成果: Article同行評審

16 引文 斯高帕斯(Scopus)

摘要

The combustion of nano-aluminum and water mixtures is studied theoretically for a particle size of 80. nm and over a pressure range of 1-10. MPa. Emphasis is placed on the effects of entrainment and agglomeration of particles on the burning rate and its dependence on pressure. The flame thickness increases by a factor of ~10, when particle entrainment is considered. This lowers the conductive heat flux at the ignition front, thereby reducing the burning rate. The pressure dependence of the burning rate is attributed to the changes in the burning time and velocity of particles with pressure. In the diffusion limit, the pressure exponent increases from 0 to 0.5, when the entrainment index increases from 0 to 1.0. A similar trend is observed in the kinetics-controlled regime, although the corresponding value exceeds the diffusion counterpart by 0.5. The kinetics-controlled model significantly over-predicts the burning rate and its pressure exponent, depending on the entrainment index. The present analysis suggests that nano-particles formed closely-packed agglomerates of diameter 3-5. μm, which may burn under diffusion-controlled conditions at high pressures.

原文English
頁(從 - 到)2215-2217
頁數3
期刊Combustion and Flame
161
發行號8
DOIs
出版狀態Published - 2014 八月

All Science Journal Classification (ASJC) codes

  • 化學 (全部)
  • 化學工程 (全部)
  • 燃料技術
  • 能源工程與電力技術
  • 物理與天文學 (全部)

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