Laminar drag reduction by optimization of hydrophobic microstructure

通过数值模拟研究了微通道壁面性质（亲水性或亲水性、表面微观结构）对气液界面行为的影响以及气液界面对微通道减阻的影响。只有当微观结构具有疏水表面时，才会在精细结构中形成气液界面。气液界面是导致减阻效果达到33%的因素。减阻效果受气液界面位置、高程、通道高度、雷诺数等因素的影响。

We investigated the effect of the wall surface properties(hydrophilicity or hydrophilicity, surface microstructure) on the behavior of gas-liquid interface and the effect of the gas-liquid interface on the drag reduction in a micro channel by numerical simulation. Only if the microstructure with a hydrophobic surface, the gas-liquid interface is formed in the fine structure. The Gas-liquid interface is the factors that give rise to drag reduction effect up to 33%. The drag reduction effect is affected by the location and the elevation of the gas-liquid interface, the channel height, and the Re number.