Simulation of the Resistance of Superhydrophobic Microchannel in Turbulent Regime

doi:10.16182/j.issn1004731x.joss.17-0348

Abstract

Abstract: VOF model and the Realizable k-ε turbulent model are used to simulate the three-dimensional flow field of superhydrophobic microchannels with longitudinal and transverse microstructures in turbulent regime, the effects of structural parameters on the resistance characteristics of superhydrophobic surface are analyzed. The results show that the superhydrophobic microchannels with longitudinal microgrooves exhibit significant reductions in drag; with the increase of the free shear area ratio and the width of the microchannel, the ratio of pressure drop increases, and the average friction factor decreases, as well as the drag reduction effect is highly significant; with the increase of microchannel height, the ratio of pressure drop decreases, and the average friction factor increases; the pressure drop reduction and the average friction factor are slightly dependent on the depth of microgroove. The superhydrophobic microchannel with transverse microgrooves exhibits increasing resistance, and selecting the appropriate microgroove direction of microchannel is important to control the effect of drag reduction.

Key words: structural parameters, superhydrophobic surface, microchannel, turbulent flow, resistance characteristics

CLC Number:

Li Chunxi, Cui Qingze, Ye Xuemin. Simulation of the Resistance of Superhydrophobic Microchannel in Turbulent Regime[J]. Journal of System Simulation, 2019, 31(10): 2138-2145.

References

[1] 王鹏伟, 刘明杰, 江雷. 仿生多尺度超浸润界面材料[J]. 物理学报, 2016, 65(18): 56-78.
Wang Pengwei, Liu Mingjie, Jiang Lei.Bioinspired multiscale interfacial materials with superwettability[J]. Acta Physica Sinica, 2016, 65(18): 56-78.
[2] Feng L, Li S, Li Y, et al.Superhydrophobic surfaces: from natural to artificial[J]. Advanced Materials (S0935-9648), 2002, 14(24): 1857-1860.
[3] 宋保维, 任峰, 胡海豹, 等. 表面张力对疏水微结构表面减阻的影响[J]. 物理学报, 2014, 63(5): 0547081-0547089.
Song Baowei, Ren Feng, Hu Haibao, et al.Drag reduction on micro-structured hydrophobic surfaces due to surface tension effect[J]. Acta Physica Sinica, 2014, 63(5): 0547081-0547089.
[4] Nakajima A, Hashimoto K, Watanabe T.Recent studies on super-hydrophobic films[J]. Monatshefte für Chemie/ Chemical Monthly (S1434-4475), 2001, 132(1): 31-41.
[5] Feng L, Yang Z, Zhai J, et al.Superhydrophobicity of nanostructured carbon films in a wide range of pH values[J]. Angewandte Chemie International Edition (S1433-7851), 2003, 42(35): 4217-4220.
[6] Lauga E, Stone H A.Effective slip in pressure-driven stokes flow[J]. Journal of Fluid Mechanics (S0022-1120), 2003, 489: 55-77.
[7] Ou J, Perot B, Rothstein J P.Laminar drag reduction in microchannels using ultrahydrophobic surfaces[J]. Physics of Fluids (S1070-6631), 2004, 16(12): 4635-4643.
[8] Ou J, Rothstein J P.Direct velocity measurements of the flow past drag-reducing ultrahydrophobic surfaces[J]. Physics of Fluids (S1070-6631), 2005, 17(10): 103606.
[9] Davies J, Maynes D, Webb B W, et al.Laminar flow in a microchannel with superhydrophobic walls exhibiting transverse ribs[J]. Physics of Fluids (S1070-6631), 2006, 18(8): 087110.
[10] Gogte S, Vorobieff P, Truesdell R, et al.Effective slip on textured superhydrophobic surfaces[J]. Physics of fluids (S1070-6631), 2005, 17(5): 051701.
[11] Woolford B, Prince J, Maynes D, et al.Particle image velocimetry characterization of turbulent channel flow with rib patterned superhydrophobic walls[J]. Physics of Fluids (S1070-6631), 2009, 21(8): 085106.
[12] Daniello R J, Waterhouse N E, Rothstein J P.Drag reduction in turbulent flows over superhydrophobic surfaces[J]. Physics of Fluids (S1070-6631), 2009, 21(8): 085103.
[13] 成璐. 微纳二级结构超疏水表面湍流减阻机理的TRPIV实验研究[D]. 天津: 天津大学, 2014.
Cheng Lu.TRPIV Experimental investigation on mechanism of turbulence drag reduction by micronano structural superhydrophobic surface[D]. Tianjin: Tianjin University, 2014.
[14] Min T, Kim J.Effects of hydrophobic surface on skin-friction drag[J]. Physics of Fluids (S1070-6631), 2004, 16(7): 55-58.
[15] Fukagata K, Kasagi N, Koumoutsakos P.A theoretical prediction of friction drag reduction in turbulent flow by superhydrophobic surfaces[J]. Physics of fluids (S1070-6631), 2006, 18(5): 051703.
[16] 吕田, 陈晓玲. 超疏水性圆管湍流减阻的数值模拟[J]. 上海交通大学学报, 2009, 43(8): 1280-1283.
Lü Tian, Chen Xiaoling.Numerical simulation of drag reduction of circular pipe with superhydrophobic wall in turbulent flow[J]. Journal of Shanghai Jiaotong University, 2009, 43(8): 1280-1283.
[17] Park H, Park H, Kim J.A numerical study of the effects of superhydrophobic surface on skin-friction drag in turbulent channel flow[J]. Physics of Fluids (S1070-6631), 2013, 25(11): 110815.
[18] Lee J, Jelly T, Zaki T.Effect of Reynolds number on turbulent drag reduction by superhydrophobic surface textures[J]. Flow Turbul. Combust (S1386-6184), 2015, 95(2/3): 277-300.
[19] 宋保维, 郭云鹤, 胡海豹, 等. 微结构超疏水表面减阻特性数值研究[J]. 计算物理, 2013, 30(1): 70-74.
Song Baowei, Guo Yunhe, Hu Haibao, et al.Drag reduction on micro-structured superhydrophobic surfaces[J]. Chinese Journal of Computational Physics, 2013, 30(1): 70-74.
[20] 黄桥高, 潘光, 宋保维, 等. 超疏水表面流场特性及减阻规律的数值仿真研究[J]. 船舶力学, 2014, 18(1): 1-11.
Huang Qiaogao, Pan Guang, Song Baowei, et al.Numerical simulation of superhydrophobic surface’s flow field characteristic and drag reduction rule[J]. Journal of Ship Mechanics, 2014, 18(1): 1-11.
[21] Watanabe S, Mamori H, Fukagata K.Drag-reducing performance of obliquely aligned superhydrophobic surface in turbulent channel flow[J]. Fluid Dynamics Research (S0169-5983), 2017, 49(2): 025501.
[22] 李春曦, 张硕, 叶学民. 界面曲率对超疏水微通道减阻的影响[J]. 系统仿真学报, 2018,30(10):3903-3913.
Li Chunxi, Zhang Shuo, Ye Xuemin.Effect of interface curvature on drag reduction of superhydrophobic microchannels[J]. Journal of System Simulation, 2018, 30(10): 3903-3913.
[23] 朱红钧. FLUENT流体分析及仿真实用教程[M]. 北京: 人民邮电出版社, 2010.
Zhu Hongjun.FLUENT fluid analysis and simulation practical tutorial[M]. Beijing: Posts & Telecom Press, 2010.
[24] White F M, Corfield I.Viscous fluid flow[M]. New York: McGraw-Hill, 2006.