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Title: Improvement of rectification effects in diffuser/nozzle structures with viscoelastic fluids
Authors: Nguyen, Nam-Trung
Lam, Yee-Cheong
Ho, Soon-Seng
Low, Cassandra Lee-Ngo
Keywords: DRNTU::Engineering::Mechanical engineering::Fluid mechanics
Issue Date: 2008
Source: Nguyen, N.-T., Lam, Y.-C., Ho, S.-S., & Low, C. L.-N. (2008). Improvement of rectification effects in diffuser/nozzle structures with viscoelastic fluids. Biomicrofluidics, 2(3), 034101-.
Series/Report no.: Biomicrofluidics
Abstract: This paper reports the improvement of rectification effects in diffuser/nozzle structures with viscoelastic fluids. Since rectification in a diffuser/nozzle structure with Newtonian fluids is caused by inertial effects, micropumps based on this concept require a relatively high Reynolds numbers and high pumping frequencies. In applications with relatively low Reynolds numbers, anisotropic behavior can be achieved with viscoelastic effects. In our investigations, a solution of dilute polyethylene oxide was used as the viscoelastic fluid. A microfluidic device was fabricated in silicon using deep reactive ion etching. The microfluidic device consists of access ports for pressure measurement, and a series of ten diffuser/nozzle structures. Measurements were carried out for diffuser/nozzle structures with opening angles ranging from 15° to 60°. Flow visualization,pressure drop and diodicity of de-ionized water and the viscoelastic fluid were compared and discussed. The improvement of diodicity promises a simple pumping concept at low Reynolds numbers for lab-on-a-chip applications.
ISSN: 1932-1058
DOI: 10.1063/1.2959099
Rights: © 2008 American Institute of Physics.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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