Measurement of the steady-state electroosmotic velocity distributions in microchannels has been reported in the literature. Characterizing time-dependent electrokinetic flows is of importance to the development of microfluidic devices such as rapid capillary electrophoretic separation systems, AC pumps, novel micromixers etc. In this paper, we report a novel technique for studying and quantifying the transient electrokinetic flow phenomena in microchannels using the micro-PIV system with an ordinary PIV CCD camera. This is achieved by synchronizing different trigger signals for the laser, CCD camera, and custom high-voltage switch. Using the transient micro-PIV technique, we further propose a method to determine the electrophoretic component in the particle velocity and the zeta potential of the channel wall. Then the time evolution of the full-field, electroosmotic velocity distributions in both open- and closed-end rectangular microchannels is obtained from the micro-PIV measurement data. Using the slip velocity approach and the measured channel zeta potential, the theoretical predictions of the transient electroosmotic flow in the open- and closed-end microchannels are obtained, and they are found in good agreement with the experimental results.
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ASME 4th International Conference on Nanochannels, Microchannels, and Minichannels
June 19–21, 2006
Limerick, Ireland
Conference Sponsors:
- Nanotechnology Institute
ISBN:
0-7918-4760-8
PROCEEDINGS PAPER
Measurement of Transient Electrokinetic Flow in Microchannels Using Micro-PIV Technique
Deguang Yan,
Deguang Yan
Nanyang Technological University, Singapore
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Chun Yang,
Chun Yang
Nanyang Technological University, Singapore
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Nam-Trung Nguyen,
Nam-Trung Nguyen
Nanyang Technological University, Singapore
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Xiaoyang Huang
Xiaoyang Huang
Nanyang Technological University, Singapore
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Deguang Yan
Nanyang Technological University, Singapore
Chun Yang
Nanyang Technological University, Singapore
Nam-Trung Nguyen
Nanyang Technological University, Singapore
Xiaoyang Huang
Nanyang Technological University, Singapore
Paper No:
ICNMM2006-96071, pp. 223-231; 9 pages
Published Online:
September 15, 2008
Citation
Yan, D, Yang, C, Nguyen, N, & Huang, X. "Measurement of Transient Electrokinetic Flow in Microchannels Using Micro-PIV Technique." Proceedings of the ASME 4th International Conference on Nanochannels, Microchannels, and Minichannels. ASME 4th International Conference on Nanochannels, Microchannels, and Minichannels, Parts A and B. Limerick, Ireland. June 19–21, 2006. pp. 223-231. ASME. https://doi.org/10.1115/ICNMM2006-96071
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