Journal
CHINESE SCIENCE BULLETIN
Volume 54, Issue 24, Pages 4560-4565Publisher
SCIENCE PRESS
DOI: 10.1007/s11434-009-0577-5
Keywords
super-hydrophobic surface; slip length; drag reduction; rheometer
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Funding
- Foundation for the Author of National Excellent Doctoral Dissertation of China [2006039]
- Key Research Foundation of the National Natural Science Foundation of China [50435030]
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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 pm for 70 wt% glycerin flow over a super-hydrophobic surface with stripe structure (the period, width and height of ridges are 150 pm, 40 pm and 65 pm, 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 micro- to nano- scale.
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