疏水性材料减阻特性实验研究  

Experiments on the drag-reduction of non-wetting materials

作　　者：余永生[1] 魏庆鼎[1] 

机构地区：[1]北京大学湍流与复杂系统国家重点实验室,北京100871

出　　处：《实验流体力学》2005年第2期60-66,共7页Journal of Experiments in Fluid Mechanics

基　　金：国家自然科学基金(基金编号10172007)

摘　　要：应用光滑的和粗糙的、亲水性的和疏水性的平板在水槽中进行了测力和边界层流场测量,以廓清壁面材质、粗糙度和雷诺数对壁面摩阻的影响。实验结果表明:材料的疏水性和壁面的适度粗糙的共同作用才能表现出明显的层流减阻效果。As an initial study on the drag-reduction of water-repellent materials, the drag and boundary layer velocity profile of four plates are measured in a water tunnel. The plates have the same shape but different water-repellent qualification and surface qualification.They are specified as wetting and smooth, non-wetting and smooth, wetting and rough, non-wetting and rough plates, respectively. Drag reduction appears in laminar flow when the non-wetting plate is compared with the substrate wetting and smooth plate. But the other two plates show no obviously difference among the substrate plate. So the drag reduction of non-wetting materials is confirmed to be the co-laboring effect of the water-repellent qualification and surface structure of the surface material. The measured velocity profile suggests that the non-wetting and rough surface had brought forward the transition of laminar boundary and it is dictated that the drag-reduction of non-wetting rough plate mainly results from the laminar flow drag-reduction.

关 键 词：疏水性材料 实验研究 减阻特性 流场测量 减阻效果 共同作用 边界层 亲水性 壁面 雷诺数 粗糙度 层流 

分 类 号：O357.54[理学—流体力学] TP212[理学—力学]