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�������պ����ѧѧ�� 2005, Vol. 31 Issue (05) :583-586    DOI:
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Enhanced mixing in 2D micro-channel electro-osmotic flows
Fang Li, Zhang Jinbai*
School of Aeronautic Science and Technology, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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Abstract�� Micro electro-mechanical system (MEMS) elements are extremely small,soslow mixing due to low Reynolds number is the one of most significant performance limitations for micro-fluidic systems.The present work is a numerical study of the electro-osmotic flows (EOF) in micro-channel with non-uniform wall zeta potential. In particular, the mixing enhancements of micro-channel flow were investigated, which are due to induced transverse flows resulting from the variations in the wall zeta potential. Based on the Helmholtz-Smoluchowski wall slip velocity model for EOF, four cases of electro-osmotic flows in micro-channel with non-uniform wall slip velocitys and the mixing of the passive scale in these flows were computed with the semi-implicit method for pressure-linked equations (SIMPLE) algorithm. The results show that the non-uniform wall slip velocitys induce zigzag streamlines, and as a result, the mixing are enhanced. In generally, the mixing efficiency increases with the strength of the transverse flows.
Keywords�� mixing   electroosmosis   channel flow   micro electro-mechanical devices   electro-hydrodynamics     
Received 2004-11-04;
About author: �� ��(1969-),��,�����Ž���,��ʿ��, fl@bjyouth.net.
����, �ž���.��ά΢�۵�����������ǿ���[J]  �������պ����ѧѧ��, 2005,V31(05): 583-586
Fang Li, Zhang Jinbai.Enhanced mixing in 2D micro-channel electro-osmotic flows[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2005,V31(05): 583-586
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