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首页> 外文会议>2015 Proceedings of the ASME 13th international conference on nanochannels, microchannels, and minichannels >MOLECULAR DYNAMICS STUDY ON EXPLOSIVE BOILING OF THIN LIQUID ARGON FILM ON NANOSTRUCTURED SURFACE UNDER DIFFERENT WETTING CONDITIONS
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MOLECULAR DYNAMICS STUDY ON EXPLOSIVE BOILING OF THIN LIQUID ARGON FILM ON NANOSTRUCTURED SURFACE UNDER DIFFERENT WETTING CONDITIONS

机译：润湿条件下纳米结构薄液氩膜爆炸沸腾的分子动力学研究

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Molecular dynamics (MD) simulations have been performed to investigate the boiling phenomena of thin liquid film adsorbed on a nanostructured solid surface with particular emphasis on the effect of wetting condition of the solid surface. The molecular system consists of liquid and vapor argon, and solid platinum wall. The nanostructures which reside on top of the solid wall have shape of rectangular block. The solid-liquid interfacial wettability, in other words whether the solid surface is hydrophilic or hydrophobic has been altered for different cases to examine its effect on boiling phenomena. The initial configuration of the simulation domain comprised a three phase system (solid platinum, liquid argon and vapor argon) which was equilibrated at 90 K. After equilibrium period, the wall temperature was suddenly increased from 90 K to 250 K which is far above the critical point of argon and this initiates rapid or explosive boiling. The spatial and temporal variation of temperature and density as well as the variation of system pressure with respect to time were closely monitored for each case. The heat flux normal to the solid surface was also calculated to illustrate the effectiveness of heat transfer for different cases of wetting conditions of solid surface. The results show that the wetting condition of surface has significant effect on explosive boiling of the thin liquid film. The surface with higher wettability (hydrophilic) provides more favorable conditions for boiling than the low-wetting surface (hydrophobic) and therefore, liquid argon responds quickly and shifts from liquid to vapor phase faster in case of hydrophilic surface. The heat transfer rate is also much higher in case of hydrophilic surface.
机译：已经进行了分子动力学（MD）模拟以研究吸附在纳米结构固体表面上的液体薄膜的沸腾现象，特别着重于固体表面的润湿条件的影响。分子系统由液态氩和蒸气氩以及固态铂壁组成。驻留在固体壁顶部的纳米结构具有矩形块的形状。固液界面润湿性，换言之，对于不同的情况，已经改变了固体表面是亲水的还是疏水的，以检查其对沸腾现象的影响。模拟域的初始配置包括一个在90 K时达到平衡的三相系统（固态铂，液态氩和蒸气氩）。在平衡期之后，壁温突然从90 K升高到250 K，该温度远高于该温度。氩气的临界点，这会引发快速或爆炸性沸腾。对于每种情况，都密切监视温度和密度的时空变化以及系统压力随时间的变化。还计算了垂直于固体表面的热通量，以说明在固体表面润湿条件不同情况下传热的有效性。结果表明，表面润湿条件对液膜的爆炸沸腾有显着影响。具有较高润湿性（亲水性）的表面比具有低润湿性的表面（疏水性）提供了更有利的沸腾条件，因此，在具有亲水性的情况下，液氩反应迅速，并且从液相快速转变为气相。在亲水表面的情况下，传热速率也更高。

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