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dc.contributor.authorNguyen, Nam-Trungen
dc.contributor.authorLam, Yee-Cheongen
dc.contributor.authorHo, Soon-Sengen
dc.contributor.authorLow, Cassandra Lee-Ngoen
dc.identifier.citationNguyen, 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-.en
dc.description.abstractThis 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.en
dc.format.extent15 p.en
dc.rights© 2008 American Institute of Physics.en
dc.subjectDRNTU::Engineering::Mechanical engineering::Fluid mechanicsen
dc.titleImprovement of rectification effects in diffuser/nozzle structures with viscoelastic fluidsen
dc.typeJournal Articleen
dc.contributor.schoolSchool of Electrical and Electronic Engineeringen
dc.contributor.schoolSchool of Mechanical and Aerospace Engineeringen
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