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http://dx.doi.org/10.3795/KSME-A.2009.33.4.417

Fabrication and Mixing Characteristics of a Micro-Mixer with a Quasi-Active Rotor  

Kim, Young-Dae (KAIST 항공우주공학)
Lee, Jong-Kwang (KAIST 항공우주공학)
Kwon, Se-Jin (KAIST 항공우주공학)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.33, no.4, 2009 , pp. 417-424 More about this Journal
Abstract
A micro-mixer with a quasi-active rotor was fabricated, and mixing characteristics were evaluated. The proposed micro-mixer combines an active type micro-mixer with a passive type micro-mixer. The micro-rotor, which is a moving part of an active type micro-mixer, is added in a micro-chamber of a passive type vortex micro-mixer. The rotor rotated by inflows tangent to a chamber, causing strong perturbations. The micro-mixers were fabricated using photosensitive glass. Mixing efficiency of the micro-mixers was measured using an image analysis method. Mixing efficiency and characteristics of the micro-rotor mixer were compared with the vortex micro-mixer without a rotor. Mixing efficiency was reduced as Reynolds number increased at a low Reynolds number due to decrease of residence time. Mixing efficiency at higher Reynolds number, on the other hand, was improved even though residence time decreased since the contact surface between fluids increased by twisted flow. The perturbation induced by rotating rotor at greater than Re 200 improved the efficiency of the rotor mixer.
Keywords
Micro Mixer; Micro Rotor; Photosensitive Glass; Rotor Mixer;
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1 Lee, J. K., Kim, Y. D., Choe, J. H., and Kwon, S. J., 2006, 'A Micro Mixer with Recirculation Zones,' Transactions of the KSME A, Vol. 30, No. 12, pp. 1642-1648   과학기술학회마을   DOI   ScienceOn
2 Lin, C. H., Tsai, C. H. and Fu, L. M., 2005, 'A Rapid Three Dimensional Vortex Micromixer Utilizing Self-Rotation Effects Under Low Reynolds Number Conditions,' Journal of Micromechanics and Microengineering, Vol. 15, pp. 935-943   DOI   ScienceOn
3 Suh, Y. K., 1996, 'Analysis of Stirring and Mixing Based on the Theory of Chaos,' Transactions of the KSME, Vol. 36, No. 4, pp. 338-350
4 Kim, T. G. and Kwon, S. J., 2006, 'Design, Fabrication and Testing of a Catalytic Microreactor for Hydrogen Catalytic Microreactor for Hydrogen Production,' Journal of Micromechanics and Microengineering, Vol. 16, pp. 1752-1760   DOI   ScienceOn
5 Feindt, K., Harnisch, A., Zoppig, V., Hulsenberg, D. and Kallenbach, E., 1998, '3D-Structuring of Photosensitive Glasses,' MEMS'98, pp. 207-210   DOI
6 Dietrich, T. R., Ehrfeld, W., Lacher, M. and Kraemer, M. , 1996, 'Fabrication Technologies for Microsystems Utilizing Photoetchable Glass,' Microelectronic Engineering, Vol. 30, pp. 497-504   DOI   ScienceOn
7 Muller, A., Cominos, V., Hessel, V., Horn, B., Schurer, J., Ziogas, A., Jahnisch, K., Hillmann, V., Groszer, V., Jam, K. A., Bazzanella, A., Rinke, G. and Kraut, M., 2005, 'Fluidic Bus System for Chemical Process Engineering in the Laboratory and for Small-Scale Production,' Chemical Engineering Journal, Vol. 107, pp. 205-214   DOI   ScienceOn
8 Hessel, V., Hardt, S., Löwe, H. and Schonfeld, F., 2003, 'Laminar Mixing in Different Interdigital Micromixers: I. Experimental Characterization,' A.I.Ch.E. Journal, Vol.49, No.3, pp.566-577   DOI   ScienceOn
9 Wang, H., Iovenitti, P., Harvey, E. and Masood, Syed, 2002, 'Optimizing Layout of Obstacles for Enhanced Mixing in Microchannels,' Smart Material and Structures, Vol. 11, pp. 662-667   DOI   ScienceOn
10 Oddy, M. H., Santiago, J. G. and Mikkelsen, J. C., 2001, 'Electrokinetic Instability Micromixing,' Analytical Chemistry, Vol. 73, pp. 5822-5832   DOI   ScienceOn
11 Hasebe, S., 2004, 'Design and Operation of Micro-Chemical Plants - Bridging the Gap Between Nano, Micro and Macro Technologies,' Computers & Chemical Engineering, Vol. 29, pp. 57-64   DOI   ScienceOn
12 Villermaux, J., Falk, L., Fournier, M. C. and Detrez, C., 1991, 'Use of Parallel Competing Reactions to Characterize Micromixing Efficiency,' A.I.Ch.E. Symp. Ser., Vol. 88, No. 186, p. 6
13 Ryu, K. S., Shaikh, K., Goluch, E., Fan, Z. and Liu, C., 2004, 'Micro Magnetic Stir-Bar Mixer Integrated with Parylene Microfluidic Channels,' Lab on a Chip, Vol. 4, pp. 608-613   DOI   ScienceOn
14 IMM, http://www.imm-mainz.de
15 Ehrfeld, http://www.ehrfeld.com
16 Ehrfeld, W., Golbig, K., Hessel, V., Lowe, H. and Richter, T., 1999, 'Characterization of Mixing in Micromixers by a Test Reaction: Single Mixing Units and Mixer Arrays,' Ind. Eng. Chem. Res., Vol. 38, pp. 1075-1082   DOI   ScienceOn
17 Dittrich, P. S., Tachikawa, K. and Manz, A., 2006, 'Micro Total Analysis Systems. Latest Advancements and Trends,' Analytical Chemistry, Vol. 78, pp. 3887-3908   DOI   ScienceOn
18 Liu, R. H., Yang, J., Pindera, M. Z., Athavale, M. and Grodzinski, P., 2002, 'Bubble-Induced Acoustic Micromixing,' Lab on a Chip, Vol. 2, pp. 151-157   DOI   ScienceOn
19 Ehrfeld, W., 2003, 'Electrochemistry and Microsystems,' Electrochimica Acta, Vol. 48, pp. 2857-2868   DOI   ScienceOn
20 Manz, A., Graber, N. and Widmer, H. M., 1990, 'Miniaturized Total Chemical Analysis Systems: A Novel Concept for Chemical Sensing,' Sensors and Actuators, pp. 244-248
21 Jensen, K. F., 2001, 'Microreaction Engineering - is Small Better?,' Chemical Engineering Science, Vol. 56, pp. 293-303   DOI   ScienceOn
22 Stroock, A. D., Dertinger, S. K. W., Ajdari, A., Mezic, I., Stone, H. A. and Whitesides, G. M., 2002 'Chaotic Mixer for Microchannels,' Science, Vol. 295, pp. 647-651   DOI   ScienceOn
23 Schonfeld, F., Hessel, V. and Hofmann, C., 2004, 'An Optimized Split-and-Recombine Micro-Mixer with Uniform 'Chaotic' Mixing,' Lab on a Chip, Vol. 4, pp. 65-69   DOI   ScienceOn