Microscopic Textured Surfaces for Micro-Fluidic Applications

Mayank Garg; Amit Agrawal; Ramesh K. Singh; Suhas S. Joshi

doi:10.20965/ijat.2011.p0030

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IJAT Vol.5 No.1 pp. 30-37

doi: 10.20965/ijat.2011.p0030

(2011)

Paper:

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Microscopic Textured Surfaces for Micro-Fluidic Applications

Mayank Garg, Amit Agrawal, Ramesh K. Singh,
and Suhas S. Joshi

Department of Mechanical Engineering, Indian Institute of Technology Bombay, Mumbai, 400 076, India

Received:

September 22, 2010

Accepted:

November 25, 2010

Published:

January 5, 2011

Keywords:

textured surfaces, CFD simulation, pressure drop, micro-pillars, micro-channels

Abstract

Many attempts have been made to fabricate textured surfaces that imitate the configurations of naturally occurring surfaces, the most common being the hierarchical microstructure on a lotus leaf. In addition, numerical simulations have also been performed to evaluate limited variations in the configurations of the textured surfaces. However, in reality, the surfaces occurring in nature have numerous variations. In this work, an attempt is made to consider a few of these variations on a surface bearing micro-pillars used in a micro-channel. The variations in the surface texture geometry include a change in the orientation, height, and corner radius of micro-pillars. Numerical simulations are performed using CFD-based methods to evaluate the pressure drop across the micro-channels bearing the textured surfaces on their bottom face. It is observed that the surfaces bearing uniform, upright pillars offer the least resistance to fluid flow while flat surfaces offer the highest resistance. While the orientation of the pillars with respect to flow direction does not change the pressure drop significantly, the pillars with rounded edges and the pillars with larger standard deviations in their heights offer considerably more resistance to the flow of fluid than the uniformly upright pillars. This study will help designers to incorporate these variations in their surface design to obtain the desired results.

Cite this article as:

M. Garg, A. Agrawal, R. Singh, and S. Joshi, “Microscopic Textured Surfaces for Micro-Fluidic Applications,” Int. J. Automation Technol., Vol.5 No.1, pp. 30-37, 2011.

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References

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This article is published under a Creative Commons Attribution-NoDerivatives 4.0 Internationa License.

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[2] [2] I. Etsion, “Improving tribological performance of mechanical components by laser surface texturing,” Tribology Letters, Vol.17, No.4, pp. 733-737, 2004.

[3] [3] K. Komvopoulos and J. Adhes, “Adhesion and friction forces in microelectro-mechanical systems: mechanisms, measurement, surface modification techniques, and adhesion theory,” J. of Adhesion Sci. and Technol., Vol.17, No.4, 2003.

[4] [4] A. Lakhtakia and S. Ashok, “Analysis of textured surfaces for photovoltaics,” Solar Energy Materials and Solar Cells 96, pp. 137-146, 1997.

[5] [5] W. Barthlott and C. Neinhuis., “Purity of the sacred lotus, or escape from contamination in biological surfaces,” Planta 202, 1997.

[6] [6] T. W. Kim and B. Bhushan, “Effect of stiffness of multi-level hierarchical attachment system on adhesion enhancement,” Ultramicroscopy 107, pp. 902-912, 2007.

[7] [7] J. Ou, B. Perot, and J. P. Rothstein, “Laminar drag reduction in micro-channels using ultra-hydrophobic surfaces,” Physics of Fluid, Vol.16, No.12, 2004.

[8] [8] K. Watanabe, Yanuar, H. Udagawa, et al., “Drag reduction of Newtonian fluid in a circular pipe with a highly water-repellant wall,” J. Fluid Mech., Vol.381, pp. 225-238, 1999.

[9] [9] P.-F. Hao, C. Wong, Z.-H. Yao, K.-Q. Zhu, et al., “Laminar drag reduction in hydrophoic micro-channels,” Chem. Eng. Technol., Vol.32, No.6, pp. 912-918, 2009.

[10] [10] J. P. Hartnett, W. M. Rohsenow, and Y. I. Cho, “Handbook of heat transfer,” New York, McGraw-Hill, 5.67-5.68, 1973.

Microscopic Textured Surfaces for Micro-Fluidic Applications

Mayank Garg, Amit Agrawal, Ramesh K. Singh, and Suhas S. Joshi

Mayank Garg, Amit Agrawal, Ramesh K. Singh,
and Suhas S. Joshi