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For the drag reduction application of hydrophobic material, the drag characteristic of typical surface with different roughness or different hydrophobicity is studied by a new annulus experiment. The corresponding torque characteristic and drag reduction rate curve are acquired. The experiment indirectly calculate the surface friction of the annulus by measuring the torque of disk driving annulus and breaks through the limitation of scale in traditional microchannel experiment, avoids the drawbacks of too many influencing factors in water-tunnel experiment, and has important significance in macro application of hydrophobic material. The drag reduction effect of hydrophobic surface is proved at low Reynolds number in macroscale; however, at high Reynolds number, it will be weakened or even changed to drag producing effect, and the rapid increase of pressure drag is the major reason for increasing resistance. Through comparative analysis we find that at low Reynolds number, there will be greater effect of hydrophobicity for drag reduction; where as at high Reynolds number, the roughness will play a greater role, and may even be counterproductive to the increasing resistance.
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Keywords:
- hydrophobic surface /
- annulus experiment /
- roughness /
- drag reduction
[1] Feng L, Li S H, Li Y S, Li H J, Zhang L J, Zhai J, Song Y L, Liu B Q, Jiang L, Zhu D B 2002 Adv. Mater. 14 1857
[2] Luo Z Z, Zhang Z Z, Hu L T, Liu W M, Guo Z G, Zhang H J, Wang W J 2008 Adv. Mater. 20 970
[3] Zhang M, Geng X G, Zhang Y, Wang X N 2012 Acta Phys. Sin. 61 194702 (in Chinese) [张盟, 耿兴国, 张瑶, 王晓娜 2012 61 194702]
[4] Mei D J, Fan B C, Huang L P, Dong G 2010 Acta Phys. Sin. 59 6786 (in Chinese) [梅栋杰, 范宝春, 黄乐萍, 董刚 2010 59 6786]
[5] Saison T, Peroz C, Chauveau V, Berthier S, Sondergard E, Arribart H 2008 Bioinsp. Biomim. 3 046004
[6] Xu F Y, Liu L J, Tan J, Liu B, Mei S 2012 Acta Phys. Chim. Sin. 28 693 (in Chinese) [徐飞燕, 刘丽君, 覃健, 刘贝, 梅双 2012 物理化学学报 28 693]
[7] Wang X L, Liu X J, Zhou F, Liu W M 2011 Chem. Commun. 47 2324
[8] Wang D A, Liu Y, Yu B, Zhou F, Liu W M 2009 Chem. Mater. 21 1198
[9] Tretheway D, Meinhart C 2004 Phys. Fluids 16 1509
[10] Lauga E, Brenner M P, Stone H A 2005 Handbook of Experimental Fluid Dynamics (New York: Springer) Chap. 15
[11] Kevin J, Daniel M, Brent W W 2010 Int. J. Heat Mass Transfer. 53 786
[12] Chiu-On Ng, Henry C W Chu, Wang C Y 2010 Phys. Fluids 22 102002
[13] Ou J, Perot B, Rothstein J P 2004 Phys. Fluids 16 4635
[14] Huang Q G, Pan G, Wu H, Hu H B, Song B W 2011 J. Exp. Fluid Mech. 25 21 (in Chinese) [黄桥高, 潘光, 武昊, 胡海豹, 宋保维 2011 实验流体力学 25 21]
[15] Wang W X, Shi J, Qiu B, Li H B 2010 Acta Phys. Sin. 59 8371 (in Chinese) [王文霞, 施娟, 邱冰, 李华兵 2010 59 8371]
[16] Choi C H, Kim C J 2006 Phys. Rev. Lett. 96 066001
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[1] Feng L, Li S H, Li Y S, Li H J, Zhang L J, Zhai J, Song Y L, Liu B Q, Jiang L, Zhu D B 2002 Adv. Mater. 14 1857
[2] Luo Z Z, Zhang Z Z, Hu L T, Liu W M, Guo Z G, Zhang H J, Wang W J 2008 Adv. Mater. 20 970
[3] Zhang M, Geng X G, Zhang Y, Wang X N 2012 Acta Phys. Sin. 61 194702 (in Chinese) [张盟, 耿兴国, 张瑶, 王晓娜 2012 61 194702]
[4] Mei D J, Fan B C, Huang L P, Dong G 2010 Acta Phys. Sin. 59 6786 (in Chinese) [梅栋杰, 范宝春, 黄乐萍, 董刚 2010 59 6786]
[5] Saison T, Peroz C, Chauveau V, Berthier S, Sondergard E, Arribart H 2008 Bioinsp. Biomim. 3 046004
[6] Xu F Y, Liu L J, Tan J, Liu B, Mei S 2012 Acta Phys. Chim. Sin. 28 693 (in Chinese) [徐飞燕, 刘丽君, 覃健, 刘贝, 梅双 2012 物理化学学报 28 693]
[7] Wang X L, Liu X J, Zhou F, Liu W M 2011 Chem. Commun. 47 2324
[8] Wang D A, Liu Y, Yu B, Zhou F, Liu W M 2009 Chem. Mater. 21 1198
[9] Tretheway D, Meinhart C 2004 Phys. Fluids 16 1509
[10] Lauga E, Brenner M P, Stone H A 2005 Handbook of Experimental Fluid Dynamics (New York: Springer) Chap. 15
[11] Kevin J, Daniel M, Brent W W 2010 Int. J. Heat Mass Transfer. 53 786
[12] Chiu-On Ng, Henry C W Chu, Wang C Y 2010 Phys. Fluids 22 102002
[13] Ou J, Perot B, Rothstein J P 2004 Phys. Fluids 16 4635
[14] Huang Q G, Pan G, Wu H, Hu H B, Song B W 2011 J. Exp. Fluid Mech. 25 21 (in Chinese) [黄桥高, 潘光, 武昊, 胡海豹, 宋保维 2011 实验流体力学 25 21]
[15] Wang W X, Shi J, Qiu B, Li H B 2010 Acta Phys. Sin. 59 8371 (in Chinese) [王文霞, 施娟, 邱冰, 李华兵 2010 59 8371]
[16] Choi C H, Kim C J 2006 Phys. Rev. Lett. 96 066001
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