微纳结构超疏水表面的湍流减阻机理研究

doi:10.6052/1000-0879-13-098

力学与实践 ›› 2013, Vol. 35 ›› Issue (4): 20-24.doi: 10.6052/1000-0879-13-098

微纳结构超疏水表面的湍流减阻机理研究

卢思, 姚朝晖, 郝鹏飞, 傅承诵

清华大学航天航空学院工程力学系, 北京100084

收稿日期:2013-03-21 修回日期:2013-06-03 出版日期:2013-08-08 发布日期:2013-08-26
通讯作者: 姚朝晖,博士,副教授,研究方向为微流动.E-mail:yaozh@tsinghua.edu.cn E-mail:yaozh@tsinghua.edu.cn
基金资助:
国家自然科学基金资助项目(11272176).

DRAG REDUCTION IN TURBULENT FLOWS OVER SUPERHYDROPHOBIC SURFACES WITH MICRO-NANO TEXTURES

LU Si, YAO Zhaohui, HAO Pengfei, FU Chengsong

Department of Engineering Mechanics, School of Aerospace, Tsinghua University, Beijing 100084, China

Received:2013-03-21 Revised:2013-06-03 Online:2013-08-08 Published:2013-08-26

摘要/Abstract

摘要：

超疏水表面的优异性质使其在现代生活和工业生产中具有十分广泛的潜在应用价值. 本文采用了碳纳米管缠绕技术和聚氟硅氧烷疏水化处理方法制备了具有二级微纳米结构的超疏水表面. 测量了由该超疏水表面构建的槽道中的流动压降,将其与普通表面构建的槽道内的流动压降进行比较,发现在层流情况下,流动阻力减小最多达到了22.8%. 在湍流的情况下,超疏水表面的减阻比例约为53.3%,减阻效果比层流更加明显.利用PIV (particle image velocimetry) 技术测量了具有超疏水表面的槽道内的速度场,通过超疏水表面速度滑移和湍动脉动场信息,分析了湍流减阻效果比层流更加明显的物理机制.

关键词:

超疏水表面|二级微纳米复合结构|湍流|减阻|壁面滑移

Abstract:

The superhydrophobic surfaces have a very wide range of potential applications in the modern life and industrial production due to their excellent properties. In this paper, a kind of superhydrophobic surface was fabricated by pasting micro-nano particles onto an aluminium or PMMA (polymethylmethacrylate) substrate. The micro-nano particles were obtained by carbon nanotubes winding technology and hydrophobic processing. The pressure drop measurements were carried out in the channel with superhydrophobic surfaces above. Compared with the common surface channel, the flow resistance decreases by about 22.8% at most in the laminar flow. In the turbulent flow, the drag reduction can reach 53.3%. The velocity field in the channel with such superhydrophobic surfaces was measured by particle image velocimetry (PIV) technology. Through the slip velocities in the superhydrophobic surface and the turbulent fluctuations, the physical mechanism is revealed to show that the turbulent friction reduction effects are apparently better than in cases of laminar flows.

Key words:

superhydrophobic surface|micro-nano dual-scale structures|turbulent flow|drag reduction|slip velocity

中图分类号:

O357.1

卢思, 姚朝晖, 郝鹏飞, 傅承诵. 微纳结构超疏水表面的湍流减阻机理研究[J]. 力学与实践, 2013, 35(4): 20-24.

LU Si, YAO Zhaohui, HAO Pengfei, FU Chengsong. DRAG REDUCTION IN TURBULENT FLOWS OVER SUPERHYDROPHOBIC SURFACES WITH MICRO-NANO TEXTURES[J]. Mechanics in Engineering, 2013, 35(4): 20-24.

参考文献

1 Barthlott W, Neinhuis C. Purity of the sacred lotus or escape from contamination in biological surfaces. Planta,1997, 202 (1): 1-8
2 Neinhuis C, Barthlott W. Characterization and distribution of water-repellent, self-cleaning plant surfaces. Annals of Botany, 1997, 79(6): 667-677
3 Jiang CG, Xin SC, Wu CW. Drag reduction of a miniature boat with superhydrophobic grille bottom. AIP Advances,2011, 1(3): 032148
4 Ou J, Perot B, Rothstein JP. Laminar drag reduction in microchannels using ultrahydrophobic surfaces. Physics of Fluids, 2004, 16(12): 4635-4643
5 Ou J, Rothstein JP. Direct velocity measurements of the flow past drag-reducing ultrahydrophobic surfaces. Physics of Fluids, 2005, 17(10): 103606
6 Watanabe K, Yanuar H, Udagawa H. Drag reduction of Newtonian fluid in a circular pipe with highly water- repellent wall. J Fluid Mech, 1999, 381: 225-238
7 Choi CH, Ulmanella U, Kim J, et al. Effective slip and friction reduction in nanograted super-hydrophobic microchannels. Physics of Fluids, 2006, 18(8): 087105
8 Lu S, Yao ZH, Hao PF, et al. Drag reduction in ultrahy-drophobic channels with micro-nano structured surfaces. Science China, 2010, 53(7): 1298-1305
9 Truesdell R, Mammoli A, Vorobieff P, et al. Drag reduction on a patterned superhydrophobic surface. Phys Rev Lett,2006, 97(4): 044504
10 Maynes D, Jeffs K,Woolford B, et al. Laminar flow in a microchannel with hydrophobic surface patterned microribs oriented parallel to the flow direction. Physics of Fluids,2007, 19(9): 093603
11 Su Bin, Li Mei, Lu Qinghua. Toward understanding whether superhydrophobic surfaces can really decrease fluidic friction drag. Langmuir, 2010, 26(8): 6048-6052
12 Krupenkin TN. Turbulent drag reduction using superhy-drophobic surfaces. In: 3rd AIAA Flow Control Conference, San Francisco, 2006
13 Daniello RJ,Waterhouse NE, Rothstein JP. Drag reduction in turbulent flows over superhydrophobic surfaces. Physics of Fluids, 2009, 21(8): 085103
14 Woolford B, Prince J, Maynes D, et al. Particle image velocimetry characterization of turbulent channel flow with rib patterned superhydrophobic walls. Physics of Fluids,2009, 21(8): 085106
15 Blevins RD. Applied Fluid Dynamics Handbook. New York: Van Nostrand Reinhold, 1984

微纳结构超疏水表面的湍流减阻机理研究

DRAG REDUCTION IN TURBULENT FLOWS OVER SUPERHYDROPHOBIC SURFACES WITH MICRO-NANO TEXTURES

PDF (PC)

赞

可视化

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 1

Metrics

本文评价

推荐阅读 0