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Improvement of rectification effects in diffuser/nozzle structures with viscoelastic fluids
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FIG. 1.

Layout of the test device: (a) Chip layout, (b) the diffuser/nozzle structure.

Image of FIG. 2.

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FIG. 2.

Fabrication steps of the silicon/glass chip: (a) Lithography of the channel structures (first mask), (b) DRIE of the channel structures, (c) lithography of the access holes (second mask), (d) DRIE of the access holes, and (e) anodic bonding of the glass cover.

Image of FIG. 3.

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FIG. 3.

The fabricated devices with different opening angles and their structure dimensions: (a) , (b) , , .

Image of FIG. 4.

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FIG. 4.

Experimental setup for automatic recording of the pressure drop as a function of flow rate.

Image of FIG. 5.

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FIG. 5.

Streak images of DI-water flow in diffuser/nozzle structures with different angles (separation and recirculation are indicated by circles).

Image of FIG. 6.

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FIG. 6.

Streak images of PEO 0.1 wt.% flow in diffuser/nozzle structures with different angles (separation and recirculation are indicated by circles).

Image of FIG. 7.

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FIG. 7.

Pressure drop versus flow rate curves of water in forward and backward directions: (a) ; (b) ; (c) ; (d) .

Image of FIG. 8.

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FIG. 8.

Pressure drop versus flow rate curves of PEO 0.1 wt.% solution in forward and backward directions: (a) ; (b) ; (c) ; (d) .

Image of FIG. 9.

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FIG. 9.

Representative flow patterns in the diffuser/nozzle structure of (a) a Newtonian fluid and (b) a viscoelastic fluid.

Image of FIG. 10.

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FIG. 10.

Diodicity for DI-water and PEO 0.1 wt.% solution as function of the diffuser angle.

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/content/aip/journal/bmf/2/3/10.1063/1.2959099
2008-07-08
2014-04-16

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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