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Improvement of rectification effects in diffuser/nozzle structures with viscoelastic fluids
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/content/aip/journal/bmf/2/3/10.1063/1.2959099
2008-07-08
2014-12-19

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.

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Scitation: Improvement of rectification effects in diffuser/nozzle structures with viscoelastic fluids
http://aip.metastore.ingenta.com/content/aip/journal/bmf/2/3/10.1063/1.2959099
10.1063/1.2959099
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