• CN：11-2187/TH
• ISSN：0577-6686

›› 2014, Vol. 50 ›› Issue (12): 165-170.

• 论文 •

### 二级规则微结构对低表面能纳米通道内微流动的影响

1. 西北工业大学航海学院;中国科学院兰州化学物理研究所固体润滑国家重点实验室
• 发布日期:2014-06-20

### Effect of Secondary Regular Microstructure on the Micro-flows in Nano-channel with Low Surface Energy

HU Haibao; HE Qiang; BAO Luyao; ZHOU Feng

1. College of Marine, Northwestern Polytechnical University;State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences
• Published:2014-06-20

Abstract: In order to investigate the property of nano-Poiseuille flow using molecular dynamics simulation, while the channel has secondary regular microstructure and low surface energy. In the simulation, statistical ensemble is set as NVE, LJ/126 model as the potential energy function and rigid-atom model is used to describe the wall and the time/rescale thermostat to keep the temperature of fluid constant. Meanwhile, the potential energy parameter between solid and liquid atoms is adjusted to realize the wall of low surface energy. The results show that when the channel wall has microstructure, the vertical density profiles of fluid appeared two oscillation regions near the wall, namely significant weak oscillation within the microstructure(called second oscillation) and strong oscillation in the channel. With the increase of rectangle microstructure period (T), the oscillation degree of density profile within the secondary microstructure increase, while the oscillation in the channel is decrease. The increase of depth (H) of the rectangle microstructure result in a secondary oscillation amplitude decreases and the starting point of density profile move away the center of channel. The period and depth of the secondary microstructure also has a significant influence on the flow. As T and H increase, the average flux of channel also increase, which suggests that the channels present better drag reduction effect.