Molecular Dynamics Simulation Of Rapid Boiling Of Water On Copper Nanoscale Surfaces

The effect of scale effect on heat and mass transfer at micro-nano scale has received extensive attention with the development of MEMS/NEMS.How to enhance boiling heat transfer at micro-nano scale is the focus of academic circles.It is of great significance to study the mechanism of rapid boiling of solid surface at nanometer scale.which can effectively solve the problem of high heat flux density heat caused by miniaturization and compactness of electronic equipment.At present,it is very challenging to analyze the unconventional physical phenomena of micro-scale heat transfer through experiments.Molecular dynamics simulation is to analyze the mechanism of heat and mass transfer performance affected by structure from the molecular scale.In this paper,molecular dynamics simulation is used to study the effect of surface structure on the enhancement of heat transfer at nanometer scale.The main content consists of three parts.(1)The effect of two surface structures(T-shape and cube)on the rapid boiling heat transfer on the plate was investigated.The results show that the surface structure promotes boiling and enhances heat transfer relative to the smooth plate surface.Different surface structures have different effects on boiling,on the one hand,the effect on the speed of boiling,and on the other hand,the effect on heat transfer.Comparisons of the rate of boiling and heat flow on these three surfaces indicate that the surface of the T-shaped structure>the surface of the cubic structure>the surface of the smooth plate.(2)The high-precision structure surface is difficult to process in actual engineering and it is difficult to exist stably in high temperature and high pressure.Therefore,this paper also simulates the influence of the wedge-shaped channel structure with good engineering significance on rapid boiling.The effect of different sizes of wedge-shaped channels on the rapid boiling of the plate under the same equivalent diameter was studied.The results show that the introduction of the channel can promote the boiling and enhance the heat transfer,and the size of the wedge channel affects the degree of boiling enhancement.(3)Further research on the rapid boiling of spherical nanoparticles on the surface,analyze the influence of the change of nanometer diameter on the heat transfer effect near the surface,and lay a foundation for exploring the rapid boiling of nanofluids on the flat surface.The results show that the diameter of the nanoparticles can significantly affect the surface heat transfer.The water layer on the surface of the 3 nm diameter is more disturbed than the surface of the 2 nm diameter,the heat transfer effect is better,and the heat flux density is larger.In summary,this paper studies the effects of different surface structures such as flat plate,T-shaped structure,cubic structure,channel structure and spherical nano-surface on the rapid boiling heat transfer,but the effect of surface structure on rapid boiling and heat transfer performance is improved.The effect is significantly different.This has important guiding significance for further research on rapid boiling heat transfer enhancement of nanostructured surfaces.