Discrete Velocity Numerical Approach to Strong Evaporation of Graphite
Discrete Velocity Numerical Approach to Strong Evaporation of Graphite
复制标题
石墨强蒸发的离散速度数值方法
DOI：
10.1063/1.1941612
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
A. Gusarov
中科院分区：
文献类型：
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作者：
A. Gusarov
石墨蒸发时形成的碳蒸气含有大量分子 C2 和 C3 以及单原子 C。提出了一种基于玻尔兹曼方程松弛模型的气体混合物数值动力学方法。研究发现，克努森层后面的压力和温度比与马赫数之间的关系不依赖于蒸气成分，并且与单组分蒸气相同。蒸气的分子组成是通过降低热速度与分子质量来确定的，这会降低较重物质的蒸发速率，并通过降低再冷凝分数来确定分子质量，其作用相反。
Carbon vapor formed at graphite evaporation contains considerable amounts of molecules C2 and C3 along with single atoms C. A numerical kinetic approach to gas mixtures is proposed which is based on a relaxation model for the Boltzmann equation. It is found that relations between the pressure and temperature ratios and the Mach number behind the Knudsen layer do not depend on vapor composition and are the same as in one‐component vapor. The molecular composition of vapor is determined by decreasing the thermal velocity with molecular mass that decreases evaporation rate of heavier species and by decreasing the recondensation fraction with molecular mass that acts oppositely.