亲水/疏水复合凹槽壁面上气泡成核的分子动力学模拟研究

In this paper, the molecular dynamics method is conducted to study the effects of hydrophilic-hydrophobic composite groove substrate on bubble nucleation. The differences in nucleation behavior and nucleation rate are compared between hydrophilic-hydrophobic composite groove substrate and the groove substrate with uniform hydrophilicity and hydrophobicity, respectively. The results show that a visible bubble nucleus appears on the substrates with different wettability conditions after a period of heating on liquid argon, but the nucleation behaviors are different. The heat transfer efficiency of solid-liquid increases with the enhancement of hydrophilicity, while the potential barrier of nucleation for liquid atoms in the vicinity of the substrate decreases with the enhancement of hydrophobicity. The hydrophilic-hydrophobic composite groove has characteristics of high heat transfer efficiency on the hydrophilic side and low nucleation potential barrier on the hydrophobic side, leading to the promotion of bubble nucleation.