Burning of magnesium particles in water vapor
Burning of magnesium particles in water vapor
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DOI：
10.1007/bf00748971
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发表时间：
1971-04
期刊：
影响因子：
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通讯作者：
V. P. Prachukho;E. S. Ozerov;A. A. Yurinov-A.
中科院分区：
文献类型：
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作者：
V. P. Prachukho;E. S. Ozerov;A. A. Yurinov-A.
在大量研究镁在氧气中燃烧的文章中，几乎没有关于这种金属在水蒸气介质中燃烧的数据。后一种情况很有趣，因为在燃烧区域不可避免地会形成游离氢，游离氢的含量影响颗粒附近的热和试剂的传递条件。如果我们考虑到氧化剂在氢中的扩散系数几乎比在氮或氩中的扩散系数大一个数量级，我们可以预料到氢的存在将导致氧化剂供应速度的增加。然而，金属在水蒸气中的燃烧比热小于在氧气中的燃烧比热，因此燃烧速度取决于颗粒表面附近的温度梯度，在水蒸气中也会降低。从燃烧机理的观点来看，有关介质压力对燃烧速度影响的数据是必不可少的。众所周知，铝的燃烧速率随着压力的增加而增加，这与燃烧的准稳态和非稳态扩散理论的结论相反。考虑到镁和铝在氧气中燃烧的不同机理[4]，我们甚至不能定性地预测镁的燃速与压力的关系。
In the large number of articles on the investigation of the burning of magnesium in oxygen there are practically no data on the burning of this metal in a medium of water vapor. The latter case is interesting in that free hydrogen is inevitably formed in the burning zone, the content of which affects the conditions of transfer of heat and reagents near the particle. If we take into account that the coefficient of diffusion of an oxidizing agent in hydrogen is almost an order greater than in nitrogen or argon, we can expect that the presence of hydrogen will lead to an increase of the rate of supply of the oxidizing agent. However, the specific heat of combustion of metal in water vapor is less than in oxygen, and therefore the burning rate, depending on the temperature gradient near the surface of the particle, can also decrease in water vapor.Data on the effect of pressure on the medium on~ he burning rate are essential from the viewpoint of the mechanism of burning. As is known [1], for aluminum the burning rate increases with pressure, contrary to the conclusions of the quasistationary [2] and nonstationary [3] diffusion theories of burning. Taking into account the different mechanism of burning of magnesium and aluminum in oxygen [4], we cannot even qualitatively predict the character of the pressure dependence for the burning rate of magnesium.