NDLI: Influence of the 3D Heterogeneous Roughness on Electroosmotic Flow in Microchannels

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Hu, Yandong Werner, Carsten Li, Dongqing
Copyright Year	2004
Abstract	Surface roughness has been considered as a passive means of enhancing the species mixing in electroosmotic flow through microfluidic systems. It is highly desirable to understand the synergetic effect of the 3D roughness and the surface heterogeneity on the electrokinetic flow through microchannels. In this study, we developed a three-dimensional, finite-volume-based numerical model to simulate electroosmotic transport in a slit microchannel (formed between two parallel plates) with numerous heterogeneous prismatic roughness elements arranged symmetrically and asymmetrically on the microchannel walls. The results showed that, the rough channel’s geometry and the electroosmotic mobility ratio of the roughness elements’ surface to that of the substrate, εμ, have dramatic influence on the induced pressure field, the electroosmotic flow patterns and the electroosmotic flow rate in the heterogeneous rough microchannels. The associated sample species transport in the heterogeneous rough microchannels presents tidal-wave-like concentration field at the intersection between four neighboring rough elements when under low εμ values, and presents the concentration field similar to that of the smooth channels when under high εμ values.
Sponsorship	Nanotechnology Institute
Starting Page	825
Ending Page	832
Page Count	8
File Format	PDF
ISBN	0791841642
DOI	10.1115/ICMM2004-2418
Volume Number	ASME 2nd International Conference on Microchannels and Minichannels
Conference Proceedings	ASME 2004 2nd International Conference on Microchannels and Minichannels
Language	English
Publisher Date	2004-06-17
Publisher Place	Rochester, New York, USA
Access Restriction	Subscribed
Subject Keyword	Mechanical admittance Computer simulation Electrokinetics Surface roughness Flow (dynamics) Pressure Tides Waves Microchannels Geometry Electroosmosis Plates (structures) Microfluidics
Content Type	Text
Resource Type	Article

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