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Micromachines 2017, 8(2), 34;

Dynamic Electroosmotic Flows of Power-Law Fluids in Rectangular Microchannels

Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
Author to whom correspondence should be addressed.
Academic Editors: Weihua Li, Hengdong Xi and Say Hwa Tan
Received: 12 December 2016 / Revised: 16 January 2017 / Accepted: 18 January 2017 / Published: 24 January 2017
(This article belongs to the Special Issue Insights and Advancements in Microfluidics)
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Dynamic characteristics of electroosmosis of a typical non-Newtonian liquid in a rectangular microchannel are investigated by using numerical simulations. The non-Newtonian behavior of liquids is assumed to obey the famous power-law model and then the mathematical model is solved numerically by using the finite element method. The results indicate that the non-Newtonian effect produces some noticeable dynamic responses in electroosmotic flow. Under a direct current (DC) driving electric field, it is found that the fluid responds more inertly to an external electric field and the steady-state velocity profile becomes more plug-like as the flow behavior index decreases. Under an alternating current (AC) driving electric field, the fluid is observed to experience more significant acceleration and the amplitude of oscillating velocity becomes larger as the fluid behavior index decreases. Furthermore, our investigation also shows that electroosmotic flow of power-law fluids under an AC/DC combined driving field is enhanced as compared with that under a pure DC electric field. These dynamic predictions are of practical use for the design of electroosmotically-driven microfluidic devices that analyze and process non-Newtonian fluids such as biofluids and polymeric solutions. View Full-Text
Keywords: microfluidics; flow enhancement; electroosmosis; non-Newtonian fluids microfluidics; flow enhancement; electroosmosis; non-Newtonian fluids

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Zhao, C.; Zhang, W.; Yang, C. Dynamic Electroosmotic Flows of Power-Law Fluids in Rectangular Microchannels. Micromachines 2017, 8, 34.

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