Electrokinetically driven microfluidic mixing with patchwise surface heterogeneity and AC applied electric field

Win-Jet Luo; Cheng-Feng Yue

doi:10.1117/12.578428

8 December 2004 Electrokinetically driven microfluidic mixing with patchwise surface heterogeneity and AC applied electric field

Win-Jet Luo, Cheng-Feng Yue

Author Affiliations +

Proceedings Volume 5591, Lab-on-a-Chip: Platforms, Devices, and Applications; (2004) https://doi.org/10.1117/12.578428
Event: Optics East, 2004, Philadelphia, Pennsylvania, United States

Abstract

This paper investigates two-dimensional, time-dependent electroosmotic flows driven by an AC electric field via patchwise surface heterogeneities distributed along the microchannel walls. The time-dependent flow fields through the microchannel are simulated for various patchwise heterogeneous surface patterns using the backwards-Euler time stepping numerical method. Different heterogeneous surface patterns are found to create significantly different electrokinetic transport phenomena. It is shown that the presence of oppositely charged surface heterogeneities on the microchannel walls results in the formation of localized flow circulations within the bulk flow. These circulation regions grow and decay periodically in accordance with the applied periodic AC electric field intensity. The circulations provide an effective means of enhancing species mixing in the microchannel. A suitable design of the patchwise heterogeneous surface pattern permits the mixing channel length and the retention time required to attain a homogeneous solution to be reduced significantly.

Citation Download Citation

Win-Jet Luo and Cheng-Feng Yue "Electrokinetically driven microfluidic mixing with patchwise surface heterogeneity and AC applied electric field", Proc. SPIE 5591, Lab-on-a-Chip: Platforms, Devices, and Applications, (8 December 2004); https://doi.org/10.1117/12.578428

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available