Effects of mole fraction and surface wettability on evaporation of Ar/Kr mixtures: A molecular dynamics study
SY Cai and QB Li and WJ Li and L Zhang and XY Liu, JOURNAL OF MOLECULAR LIQUIDS, 319, 114189 (2020).
The phase transition of fluid on the solid surface plays an important role in engineering, while the mechanism of phase transition is still need to be studied in depth. Therefore, molecular dynamics simulations were employed to investigate the evaporation of different mole fraction of Ar/Kr mixtures on several wettability Pt substrates (weak hydrophobic surface, hydrophilic and weak hydrophobic mixed surface, hydrophilic and strong hydrophobic mixed surface, hydrophilic surface) at 200 K. The kinetic energy of fluid atoms and the interaction energy between Pt and fluid atoms were employed to understand the evaporation process. The vapor film boiling was observed in the systems with the mole fraction of Ar to be 100%, 75% and 50%. This leads to the heat flux significantly decreasing and heat transfer deterioration. The addition of Kr atoms will alleviate and prevent vapor film boiling of Ar atoms. Besides, the more the mole fraction of Kr in the system, the less possibility of Kr atoms can evaporate from the evaporation region. The strong hydrophobic surface would lead to the bubble generated earlier than weak hydrophobic surface. And the earlier generated bubble on hydrophilic and strong hydrophobic mixed surface will enhance the evaporation process than that on hydrophilic and weak hydrophobic mixed surface. (C) 2020 Elsevier B.V. All rights reserved.
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