Evaporation coefficient and condensation coefficient of vapor under high gas pressure conditions
Evaporation coefficient and condensation coefficient of vapor under high gas pressure conditions
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DOI：
10.1038/s41598-020-64905-5
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发表时间：
2020-05-18
影响因子：
4.6
通讯作者：
Watanabe, Masao
中科院分区：
文献类型：
--
作者：
Ohashi, Kotaro;Kobayashi, Kazumichi;Watanabe, Masao
我们研究了在高气压（高气体密度）条件下，在汽/气-液平衡状态下，蒸汽的蒸发和冷凝系数，它代表蒸汽分子的蒸发和冷凝速率。混合气体由可凝气体（蒸汽）和不可凝气体（NC气体）分子组成。采用Enskog-Vlasov直接模拟蒙特卡罗（EVDSMC）方法对汽/气-液平衡体系进行了数值模拟。模拟结果表明，随着NC气体压力的增加，蒸发和冷凝通量减小，导致蒸汽分子的蒸发和冷凝系数减小。特别是，在极高的气体压力条件下，这些系数的值接近于零，这意味着蒸汽分子不能在界面处蒸发和冷凝。此外，我们发现，蒸汽分子的行为作为NC气体分子在高气压条件下。讨论了NC气体分子干扰蒸汽分子在汽/气-液界面蒸发和凝结的原因。
We investigated the evaporation and condensation coefficients of vapor, which represent evaporation and condensation rates of vapor molecules, under high gas pressure (high gas density) conditions in a system of a vapor/gas-liquid equilibrium state. The mixture gas is composed of condensable gas (vapor) and non-condensable gas (NC gas) molecules. We performed numerical simulations of vapor/gas-liquid equilibrium systems with the Enskog-Vlasov direct simulation Monte Carlo (EVDSMC) method. As a result of the simulations, we found that the evaporation and condensation fluxes decrease with increasing NC gas pressure, which leads to a decrease in the evaporation and condensation coefficients of vapor molecules. Especially, under extremely high gas pressure conditions, the values of these coefficients are close to zero, which means the vapor molecules cannot evaporate and condensate at the interface. Moreover, we found that the vapor molecules behave as NC gas molecules under high gas pressure conditions. We also discussed the reason why NC gas molecules interfere with evaporation and condensation of vapor molecules at the vapor/gas-liquid interface.