混合润湿性柱状纳米结构对铜板上纳米氩膜沸腾传热的影响

混合润湿性对固/液相互作用有显著影响，因此对提高相变过程中的传热速率有积极作用.采用分子动力学模拟方法研究了柱状纳米结构表面混合润湿性对池沸腾传热的影响.分析了混合润湿性和纳米结构柱高对液体起始沸腾时间和温度的影响及其机理.结果表明，疏水比例和柱高会影响爆沸的起始温度和时间.与纯亲水壁相比，增加疏水比改变了固液界面性质，可以降低沸腾温度，更容易突破势能壁垒，使液体起始沸腾时间提前，并且随着疏水比的增加，不同柱高下的沸腾温度降低；当疏水比相同时，增加柱高扩大了混合润湿性的影响，也能降低沸腾起始温度并使液体起始沸腾时间提前.这为设计微纳粗糙结构和混合润湿表面以强化沸腾传热提供了思路.

Effects of columnar nanostructures with mixed wettability on explosive boiling heat transfer of nanoscale argon film over copper plate

The wettability has a significant effect on the solid-liquid interaction, so it has a positive effect on improving the heat transfer rate during the phase change process. Molecular dynamics simulation method was used to study the effect of mixed wettability of columnar nanostructures on pool boiling heat transfer. The influence of mixed wettability and nanostructure column height on the initial boiling time and temperature of liquid and its mechanism were analyzed. The results show that the hydrophobic ratio and column height will affect the initial temperature and time of boiling. Compared with pure hydrophilic wall, increasing hydrophobic ratio changes the properties of solid-liquid interface, reduces boiling temperature, makes it easier to break through potential energy barrier, and advances the initial boiling time of liquid. With the increase of hydrophobic ratio, boiling temperatures of different column heights decrease. When the hydrophobic ratio is the same, increasing the column height enlarges the influence of mixing wettability, and can also lower the boiling initial temperature and advance the boiling time of liquid. This provides an idea for designing micro-nano rough structure and mixed wetting surface to enhance boiling heat transfer.