摘要
在充分发展层流状态下对具有规则微观结构的超疏水表面流场进行数值仿真研究,分析了超疏水表面流场的减阻特性。针对超疏水表面微观结构特点,采用Cassie接触模型,对计算域利用结构化网格进行划分,采用VOF多向流模型进行数值仿真。研究表明:超疏水表面凹槽附近产生压差阻力导致凹槽内部形成低速漩涡,产生推动效应与涡垫效应;超疏水表面减阻率随凹槽槽宽增大而增大,受凹槽深度影响不显著,矩形凹槽比V形凹槽与U形凹槽有更好的减阻效果。
To our knowledge, there is almost no paper in the open literature dealing with what is mentioned in the title. Taking into account the micro-structural characteristics of a superhydrophobic surface, we use the Cassie model and the volume of fluid （VOF） model to simulate its flow field in the laminar flow between two infinitively large plates. To do so, we apply structural grids to dividing the computing domain. Then we analyze the drag reduction characteristics of the superhydrophobic surface in terms of velocity distribution, pressure distribution, slide velocity and drag reduction rate. The simulation results, given in Figs. 4 through 17, and their analysis show preliminarily that ： （ 1 ） there is pressure difference drag near the groove of the superhydrophobic surface, producing a low-speed whirlpool inside the groove and both the thrust effect and the vortex cushion effect; （2） the drag reduction rate of the superhydrophobic surface increases with increasing width of the groove, decreases with increasing space between grooves and increases with increasing flow velocity, but does not increase with increasing depth of the groove ; （3） the rectangular groove is more effective for drag reduction than both the V-shape groove and the U-shape groove.
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
2012年第5期712-717,共6页
Journal of Northwestern Polytechnical University
基金
国家自然科学基金重点项目(50838009)资助
关键词
超疏水表面
层流
减阻
滑移
drag, flow fields, laminar flow, mathematical models, drag reduction, superhydrophobic surface
