Numerical Study of Fluid Mixing in a Grooved Micro-Channel with Wavy Sidewalls
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Numerical Study of Fluid Mixing in a Grooved Micro-Channel with Wavy Sidewalls

Authors: Yu-Sin Lin, Chih-Yang Wu, Yung-Ching Chu

Abstract:

In this work, we perform numerical simulation of fluid mixing in a floor-grooved micro-channel with wavy sidewalls which may impose perturbation on the helical flow induced by the slanted grooves on the channel floor. The perturbation is caused by separation vortices in the recesses of the wavy-walled channel as the Reynolds number is large enough. The results show that the effects of the wavy sidewalls of the present micromixer on the enhancement of fluid mixing increase with the increase of Reynolds number. The degree of mixing increases with the increase of the corrugation angle, until the angle is greater than 45 degrees. Besides, the pumping pressure of the micromixer increases with the increase of the corrugation angle monotonically. Therefore, we would suggest setting the corrugation angle of the wavy sidewalls to be 45 degrees.

Keywords: Fluid mixing, grooved channel, microfluidics, separation vortex.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1087137

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References:


[1] N. T. Nguyen and Z. Wu, “Micromixers – a review,” J. Micromech. Microeng., vol. 15, pp. R1–R16, 2005.
[2] L. Capretto, W. Cheng, M. Hill, and X. Zhang, “Micromixing within Microfluidic Deivces,” Top. Curr. Chem., vol. 304, pp. 27-68, 2011.
[3] A. D. Stroock, S. K. W. Dertinger, A. Ajdari, I. Mezic, H. A. Stone and G. M. Whitesides, “Chaotic mixer for microchannels,” Science, vol. 295, pp. 647-651, 2002.
[4] H. Z. Wang, P. Iovenitti, E. Harvey, and S. Masood, “Numerical investigation of mixing in microchannels with patterned grooves,” J Micromech Microeng, vol. 13, pp. 801–808, 2003.
[5] D. G. Hassell and W. B. Zimmerman, “Investigation of the convective motion through a staggered herringbone micromixer at low Reynolds number flow,” Chem. Eng. Sci ., vol. 61, pp. 2977–2985, 2006.
[6] J.-T. Yang, K.–J. Huang, and Y.–C. Lin, “Geometric effects on fluid mixing in passive grooved micromixers,” Lab Chip, vol. 5, pp. 1140–1147, 2005.
[7] D. S. Kim, S. W. Lee, T. H. Kwon, and S. S. Lee, “A barrier embedded chaotic micromixer,” J. Micromech. Microeng., vol. 14, pp. 798-805, 2004.
[8] H. Sato, S. Ito, K. Tajima, N. Orimoto, and S. Shoji, “PDMS microchannels with slanted grooves embedded in three walls to realize efficient spiral flow,” Sens. Actuators, vol. A-119, pp. 365–371, 2005.
[9] A. M. Guzman and C. H. Amon, “Dynamical flow characterization of transitional and chaotic regimes in converging-diverging channels,” J. Fluid Mech., vol. 321, pp. 25-57, 1996.
[10] L. Goldstein and E. M.Sparrow, “Heat/mass transfer characteristics for flow in a corrugated wall channel,” Trans. ASME J. Heat Transfer, vol. 99, pp. 187–195, 1997.
[11] I. Sang and N. Hyung, “Experimental study on flow and local heat/mass transfer characteristics inside corrugated duct,” Int. J. Heat Fluid Flow, vol. 27, pp. 21–32, 2006.
[12] S. A. Rani, B. Pitts, and P. S. Stewart, “Rapid diffusion of fluorescent tracers into staphylococcus epidermidis biofilms visualized by time lapse microscopy,” Antimicrob. Agents Chemother., vol. 49, pp. 728-732, 2005.
[13] J. Boss, “Evaluation of the homogeneity degree of a mixture,” Bulk Solids Handl., vol. 6, pp. 1207-1215, 1986.