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Evaporation coefficient and condensation coefficient of vapor under high gas pressure conditions

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Title: Evaporation coefficient and condensation coefficient of vapor under high gas pressure conditions
Authors: Ohashi, Kotaro Browse this author
Kobayashi, Kazumichi Browse this author →KAKEN DB
Fujii, Hiroyuki Browse this author →KAKEN DB
Watanabe, Masao Browse this author →KAKEN DB
Issue Date: 18-May-2020
Publisher: Nature Publishing
Journal Title: Scientific Reports
Volume: 10
Issue: 1
Start Page: 8143
Publisher DOI: 10.1038/s41598-020-64905-5
PMID: 32424295
Abstract: 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.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 小林 一道

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