基于壁面滑移的疏水通道减阻特性仿真研究

Drag-reduction Characteristic Simulation Investigation about Hydrophobic Channels Based on Wall slip

基于壁面滑移理论,对层流状态下具有不同滑移条件的疏水通道进行了数值模拟。仿真过程中,提出了一种基于壁面剪应力公式模拟疏水通道滑移边界的方法。结果发现,流量一定时,疏水通道的无量纲压降比随滑移速度的增加而增加;疏水通道的滑移长度与无量纲压降比之间存在一一对应关系,滑移长度从4.82μm增加到66.54μm时,无量纲压降比从1.41%增加到16.62%,与理论推导结果有很好的吻合,表明本文提出的利用壁面剪应力公式模拟疏水通道滑移的方法是可靠的。

Numerical simulation investigation about hydrophobic channels with different slip velocity was carried out based on wall slip theory in laminar flow.A method of slip boundary simulation about hydrophobic channel was put forward based on wall shear stress formula.Results are as follows： non-dimensional pressure drop ratio increases with slip velocity while flow mass is constant;there is corresponding relation between slip length and non-dimensional pressure drop ratio;non-dimensional pressure drop ratio varies from 1.41% to 16.62% when slip length varies from 4.82 to 66.54,which is accord with the result from theory deduction.The result indicates the method about wall slip simulation is reliable based on wall shear stress formula.