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Proceedings Paper

Numerical framework for the modeling of electrokinetic flows
Author(s): Manish Deshpande; Chahid Ghaddar; John R. Gilbert; Pamela M. St. John; Timothy M. Woudenberg; Charles R. Connell; Joshua Molho; Amy Herr; Godfrey Mungal; Thomas W. Kenny
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Paper Abstract

This paper presents a numerical framework for design-based analyses of electrokinetic flow in interconnects. Electrokinetic effects, which can be broadly divided into electrophoresis and electroosmosis, are of importance in providing a transport mechanism in microfluidic devices for both pumping and separation. Models for the electrokinetic effects can be derived and coupled to the fluid dynamic equations through appropriate source terms. In the design of practical microdevices, however, accurate coupling of the electrokinetic effects requires the knowledge of several material and physical parameters, such as the diffusivity and the mobility of the solute in the solvent. Additionally wall-based effects such as chemical binding sites might exist that affect the flow patterns. In this paper, we address some of these issues by describing a synergistic numerical/experimental process to extract the parameters required. Experiments were conducted to provide the numerical simulations with a mechanism to extract these parameters based on quantitative comparisons with each other. These parameters were then applied in predicting further experiments to validate the process. As part of this research, we have created NetFlow, a tool for micro-fluid analyses. The tool can be validated and applied in existing technologies by first creating test structures to extract representations of the physical phenomena in the device, and then applying them in the design analyses to predict correct behavior.

Paper Details

Date Published: 10 September 1998
PDF: 11 pages
Proc. SPIE 3515, Microfluidic Devices and Systems, (10 September 1998); doi: 10.1117/12.322088
Show Author Affiliations
Manish Deshpande, Microcosm Technologies Inc. (United States)
Chahid Ghaddar, Microcosm Technologies Inc. (United States)
John R. Gilbert, Microcosm Technologies Inc. (United States)
Pamela M. St. John, Perkin Elmer Corp. (United States)
Timothy M. Woudenberg, Perkin Elmer Corp. (United States)
Charles R. Connell, Perkin Elmer Corp. (United States)
Joshua Molho, Stanford Univ. (United States)
Amy Herr, Stanford Univ. (United States)
Godfrey Mungal, Stanford Univ. (United States)
Thomas W. Kenny, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 3515:
Microfluidic Devices and Systems
A. Bruno Frazier; Chong Hyuk Ahn, Editor(s)

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