Two-dimensional flow dynamics in digital microfluidic systems

A two-dimensional model for the fluid flow in a digital microfluidic system is introduced, and the results are compared to experimental data. Resistive flow effects based upon contact line forces, filler effects and shear forces are applied in the model. It is found that the induced vertical velocit...

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Bibliographic Details
Published in:Journal of micromechanics and microengineering 2009-06, Vol.19 (6), p.065003-065003 (7)
Main Authors: Ahmadi, A, Najjaran, H, Holzman, J F, Hoorfar, M
Format: Article
Language:English
Subjects:
Applied sciences
Electronics
Exact sciences and technology
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Mechanical engineering. Machine design
Mechanical instruments, equipment and techniques
Microelectronic fabrication (materials and surfaces technology)
Micromechanical devices and systems
Physics
Precision engineering, watch making
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
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Summary:A two-dimensional model for the fluid flow in a digital microfluidic system is introduced, and the results are compared to experimental data. Resistive flow effects based upon contact line forces, filler effects and shear forces are applied in the model. It is found that the induced vertical velocity components are critical to the overall motion, as velocity and pressure gradients, together with microdroplet surface deformations, can limit the desired horizontal velocity. These effects are particularly important for digital microfluidic systems characterized by higher Reynolds numbers.
ISSN:0960-1317
1361-6439
DOI:10.1088/0960-1317/19/6/065003