Mean-field kinetic theory approach to Langmuir evaporation of polyatomic liquids
Mean-field kinetic theory approach to Langmuir evaporation of polyatomic liquids
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DOI：
10.1063/5.0021227
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发表时间：
2020-09
影响因子：
4.6
通讯作者：
S. Busuioc;L. Gibelli
中科院分区：
文献类型：
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作者：
S. Busuioc;L. Gibelli
利用Enskog-Vlasov模型研究了多原子液体在近真空条件下的蒸发。将分子近似为经典的刚性转动子，用Borgnakke-Larsen方法处理平动自由度和转动自由度之间的碰撞能量交换。蒸发分子的分布函数和蒸发系数的评估在很宽的范围内的液体本体温度和非弹性碰撞分数。据发现，平移速度分布函数是很好地近似由漂移双麦克斯韦，而旋转能量遵循玻尔兹曼分布的温度之间的分离和平行的温度变化的非弹性碰撞分数的增加。的蒸发系数的基础上的分离温度原来是独立的非弹性碰撞分数，只有温和地依赖于液体的本体温度。
The evaporation of polyatomic liquids into near-vacuum conditions is investigated by using the Enskog–Vlasov model. Molecules are approximated as classical rigid rotators, and the collisional energy exchanges between the translational and rotational degrees of freedom are dealt with by the Borgnakke–Larsen method. The distribution function of evaporated molecules and the evaporation coefficient are evaluated in a wide range of liquid bulk temperatures and inelastic collision fractions. It is found that the translational velocity distribution function is well approximated by a drifted bi-Maxwellian, while the rotational energy follows the Boltzmann distribution at a temperature that varies between the separation and the parallel temperatures as the inelastic collision fraction increases. The evaporation coefficient based on the separation temperature turns out to be independent of the inelastic collision fraction and only mildly dependent on the liquid bulk temperature.