On the measurement of slip length for liquid flow over super-hydrophobic surface  

作　　者：LI Jian ZHOU Ming CAI Lan YE Xia YUAN Run 

机构地区：[1]Center for Photon Manufacturing Science and Technology, Jiangsu University, Zhenjiang 212013, China

出　　处：《Chinese Science Bulletin》2009年第24期4560-4565,共6页

基　　金：Supported by the Foundation for the Author of National Excellent Doctoral Disserta-tion of China (Grant No.2006039);Key Research Foundation of the National Natural Science Foundation of China (Grant No. 50435030)

摘　　要：To design a surface with large slip or larger drag reduction is a pop issue in the fields of liquid transporting and body swimming. In this context, it is a crucial problem to measure the slip length for these surfaces. Here we propose a novel method by using rheometer for this objective. This method is implemented by designing the distribution of the super-hydrophobic area on the sample. Using this method, a slip length of 40 μm for 70 wt% glycerin flow over a super-hydrophobic surface with stripe structure (the period, width and height of ridges are 150 μm, 40 μm and 65 μm, respectively) is measured. The result shows that the slip length measured using this method is in good agreement with former results measured by other methods. This method is fit for measuring the slip length of super-hydrophobic surface whose structure ranges from microto nanoscale.To design a surface with large slip or larger drag reduction is a pop issue in the fields of liquid transporting and body swimming. In this context, it is a crucial problem to measure the slip length for these surfaces. Here we propose a novel method by using rheometer for this objective. This method is implemented by designing the distribution of the super-hydrophobic area on the sample. Using this method, a slip length of 40 μm for 70 wt% glycerin flow over a super-hydrophobic surface with stripe structure （the period, width and height of ridges are 150 μm, 40 μm and 65 μm, respectively） is measured. The result shows that the slip length measured using this method is in good agreement with former results measured by other methods. This method is fit for measuring the slip length of super-hydrophobic surface whose structure ranges from microto nano-scale.

关 键 词：疏水表面 长度测量 流量测量 滑移 液体 条纹结构 纳米尺度 微米 

分 类 号：TB383[一般工业技术—材料科学与工程] Q512.101[生物学—生物化学]