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http://bura.brunel.ac.uk/handle/2438/9314| Title: | Fluid drag-reducing effect and mechanism of superhydrophobic |
| Authors: | Zhang, J Yao, Z Hao, P Tian, H Jiang, N 4th Micro and Nano Flows Conference (MNF2014) |
| Keywords: | Superhydrophobic surface;Micro-nano textures;Drag reduction;PIV |
| Issue Date: | 2014 |
| Publisher: | Brunel University London |
| Citation: | 4th Micro and Nano Flows Conference, University College London, UK, 7-10 September 2014, Editors CS König, TG Karayiannis and S. Balabani |
| Series/Report no.: | ID 59 |
| Abstract: | In this paper, drag-reducing property and mechanism of superhydrophobic surface are investigated. Superhydrophobic surfaces with micro-nano textures were fabricated and tested using SEM and contact angle measurement. Experiments on a channel and a flat plate with superhydrophobic surface were conducted separately. For the channel flow, the drag was acquired by measuring the pressure loss. A 54% drag reduction was found both in laminar and turbulent flow over Re range from 500 to 5000. For flow over a plate, PIV measurement was used to obtain the velocity distribution at Reδ=12000. There was a 19% reduction on the total stress in the whole boundary layer. Suppressions of the turbulence intensities and the Reynolds shear stress were found, which may cause the drag reduction. |
| Description: | This paper was presented at the 4th Micro and Nano Flows Conference (MNF2014), which was held at University College, London, UK. The conference was organised by Brunel University and supported by the Italian Union of Thermofluiddynamics, IPEM, the Process Intensification Network, the Institution of Mechanical Engineers, the Heat Transfer Society, HEXAG - the Heat Exchange Action Group, and the Energy Institute, ASME Press, LCN London Centre for Nanotechnology, UCL University College London, UCL Engineering, the International NanoScience Community, www.nanopaprika.eu. |
| URI: | http://bura.brunel.ac.uk/handle/2438/9314 |
| ISBN: | 978-1-908549-16-7 |
| Appears in Collections: | Brunel Institute for Bioengineering (BIB) The Brunel Collection |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| MNF2014_Full-paper-final-Fluid_drag-reducing_effect_and_mechanism_of_superhydrophobic_surfaces_with_micro-nano_textures-Zhaohui_YAO.pdf | 286.02 kB | Adobe PDF | View/Open |
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