层流状态下超疏水表面流场建模与减阻特性仿真研究 -- 西北工业大学,2012,30(5):712-717
论文:2012,Vol:30,Issue(5):712-717
引用本文:
宋保维, 袁潇, 胡海豹. 层流状态下超疏水表面流场建模与减阻特性仿真研究[J]. 西北工业大学
Song Baowei, Yuan Xiao, Hu Haibao. Simulating Flow Field of Superhydrophobic Surface in Laminar Flow to Reduce Its Drag[J]. Northwestern polytechnical university

层流状态下超疏水表面流场建模与减阻特性仿真研究
宋保维, 袁潇, 胡海豹
西北工业大学 航海学院, 陕西 西安 710072
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。
关键词:    超疏水表面    层流    减阻    滑移   
Simulating Flow Field of Superhydrophobic Surface in Laminar Flow to Reduce Its Drag
Song Baowei, Yuan Xiao, Hu Haibao
College of Marine Engineering,Northwestern Polytechnical University,Xi'an 710072,China
Abstract:
To our knowledge, there is almost no paper in the open literature dealing with what is mentioned in thetitle.Taking into account the micro-structural characteristics of a superhydrophobic surface, we use the Cassie mod-el and the volume of fluid (VOF) model to simulate its flow field in the laminar flow between two infinitively largeplates.To do so, we apply structural grids to dividing the computing domain.Then we analyze the drag reductioncharacteristics of the superhydrophobic surface in terms of velocity distribution, pressure distribution, slide velocityand drag reduction rate.The simulation results, given in Figs.4 through 17, and their analysis show preliminarilythat: (1) there is pressure difference drag near the groove of the superhydrophobic surface, producing a low-speedwhirlpool inside the groove and both the thrust effect and the vortex cushion effect; (2) the drag reduction rate ofthe superhydrophobic surface increases with increasing width of the groove, decreases with increasing space betweengrooves 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.
Key words:    drag    flow fields    laminar flow    mathematical models    drag reduction    superhydrophobic surface   
收稿日期: 2011-10-28     修回日期:
DOI:
基金项目: 国家自然科学基金重点项目(50838009)资助
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作者简介: 宋保维(1963-),西北工业大学教授、博士生导师,主要从事水下航行体设计及减阻降噪技术等的研究。
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