超疏水表面滑移流动的模拟研究

Simulation research on super-hydrophobic surface slip flow

采用计算流体动力学方法,应用Fluent软件,在壁面条件中给定滑移速度边界条件,对超疏水表面和普通表面构成的微间距平行平板通道内单侧滑移流动进行了数值模拟。在给定条件下无量纲压降比最大可达18.5%,滑移长度最大可达188μm;针对文献[12]的单侧滑移实验条件进行了二维数值模拟,结果表明:理论压降差要小于实验压降差,比实验压差要小9.2%～11.2%。

The slip flow in micro-spacing channels of parallel flats with super-hydrophobic surface and common surface was numerically simulated with the wall slip velocity being given directly to simulate the single-slip boundary condition using Fluent software. The dimensionless pressure drop ratio was up to 18.5% and the largest slip length was up to 188 μm. Two dimension CFD simulation was carried out following the single-slip experimental condition in Ref. [12]. The result shows the theoretical pressure drop is 9.2 %- 11.2% less than experimental pressure drop