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 influ-ence of mixed wettability and nanostructure column height on the initial boiling time and temperature of liquid and their 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 chan-ges the properties of solid-liquid interface,reduces boiling temperature,makes it easier to break through poten-tial 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 col-umn height enlarges the influence of mixing wettability,and can also lower the boiling initial temperature and ad-vance the boiling time of liquid.This provides an idea for designing micro-nano rough structure and mixed wet-ting surface to enhance boiling heat transfer.
Boiling phase transitionsMixed wettabilityNanostructureHeat transfer coefficientMolecular dynamics simulation
国家科技期刊平台
NSTL
万方数据
维普
