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|Title:||Improvement of rectification effects in diffuser/nozzle structures with viscoelastic fluids||Authors:||Nguyen, Nam-Trung
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.||URI:||https://hdl.handle.net/10356/100167
|ISSN:||1932-1058||DOI:||10.1063/1.2959099||Rights:||© 2008 American Institute of Physics.||Fulltext Permission:||none||Fulltext Availability:||No Fulltext|
|Appears in Collections:||EEE Journal Articles|
MAE Journal Articles
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