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

  • Articles / Mechanical Engineering
  • Published:
Chinese Science Bulletin

Abstract

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 micro- to nano-scale.

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Correspondence to Ming Zhou.

Additional information

Supported by the Foundation for the Author of National Excellent Doctoral Dissertation of China (Grant No.2006039) and Key Research Foundation of the National Natural Science Foundation of China (Grant No. 50435030)

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Li, J., Zhou, M., Cai, L. et al. On the measurement of slip length for liquid flow over super-hydrophobic surface. Chin. Sci. Bull. 54, 4560–4565 (2009). https://doi.org/10.1007/s11434-009-0577-5

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  • DOI: https://doi.org/10.1007/s11434-009-0577-5

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