Dependencies of Surface Condensation on the Wettability and Nanostructure Size Differences

Nanomaterials

Li-Qiang Duan¹  Ming-Jun Liao¹ 

[1] School of Energy, Power and Mechanical Engineering, National Thermal Power Engineering & Technology Research Center Key Laboratory of Power Station Energy Transfer Conversion and System (North China Electric Power University), North China Electric Power University, Ministry of Education, Beijing 102206, China;

关键词: condensation;    hydrophilic surface;    hydrophobic surface;    nanostructure size;   

DOI  :  10.3390/nano10091831

来源: DOAJ

【 摘 要 】

When changing surface wettability and nanostructure size, condensation behavior displays distinct features. In this work, we investigated evaporation on a flat hydrophilic surface and condensation on both hydrophilic and hydrophobic nanostructured surfaces at the nanoscale using molecular dynamics simulations. The simulation results on hydrophilic surfaces indicated that larger groove widths and heights produced more liquid argon atoms, a quicker temperature response, and slower potential energy decline. These three characteristics closely relate to condensation areas or rates, which are determined by groove width and height. For condensation heat transfer, when the groove width was small, the change of groove height had little effect, while change of groove height caused a significant variation in the heat flux with a large groove width. When the cold wall was hydrophobic, the groove height became a significant impact factor, which caused no vapor atoms to condense in the groove with a larger height. The potential energy decreased with the increase of the groove height, which demonstrates a completely opposing trend when compared with hydrophilic surfaces.

【 授权许可】

Unknown