Low Reynolds number flow through nozzle-diffuser elements in valveless micropumps

Singhal, Vishal; Garimella, Suresh V.; Murthy, Jayathi Y.

doi:10.1016/j.sna.2004.03.002

Cited by 124 publications

(75 citation statements)

References 21 publications

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“…The concept was first presented by Stemme and Stemme (1993). Fixed-geometry nozzlediffuser valves for use with low Reynolds number flows were studied by Singhal et al (2004a) demonstrating their ability to rectify flow for laminar flows with the larger rectification occurring at higher Reynolds numbers.…”

Section: Static Geometrymentioning

confidence: 99%

Recent advances in microscale pumping technologies: a review and evaluation

Iverson

Garimella

2008

Microfluid Nanofluid

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426

249

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Micropumping has emerged as a critical research area for many electronics and biological applications. A significant driving force underlying this research has been the integration of pumping mechanisms in micro Total Analysis Systems (μTAS) and other multi-functional analysis techniques. Uses in electronics packaging and micromixing and microdosing systems have also capitalized on novel pumping concepts. The present work builds upon a number of existing reviews of micropumping strategies by focusing on the large body of micropump advances reported in the very recent literature. Critical selection criteria are included for pumps and valves to aid in determining the pumping mechanism that is most appropriate for a given application. Important limitations or incompatibilities are also addressed. Quantitative comparisons are provided in graphical and tabular forms.

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Section: Static Geometrymentioning

confidence: 99%

Recent advances in microscale pumping technologies: a review and evaluation

Iverson

Garimella

2008

Microfluid Nanofluid

Self Cite

426

249

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“…Generally, the pressure loss coefficient of diffuser channels increases with increasing 2α, and converges at 2α > 60 degrees (18) . The pressure loss coefficient of flat diffuser channels for laminar flow is the same trend (22) . The pressure loss coefficient of nozzle channels may be neglected at 2α < 30 degrees (18) .…”

Section: Preliminary Testmentioning

confidence: 64%

Development of Diffuser/Nozzle Based Valveless Micropump

Tanaka

Tsukamoto

Miyazaki

2008

JFST

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A valveless micropump was realized with a diffuser/nozzle shaped channel and a variable volume actuator which produces an oscillating flow. One-way flow may be realized in the nozzle direction since the pressure loss in a nozzle channel is lower than that in a diffuser channel. Pump characteristics were measured for various angles of a diffuser/nozzle element and positions of the actuator to investigate the effect of pump geometry on characteristics. The experimental results showed an optimal diffuser/nozzle angle for pump efficiency, and the optimal actuator position. The frequency characteristics and the pump characteristics were measured. Dimensionless variables were introduced to rearrange the measured data and to understand the physical mechanisms of the micropump.

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“…The velocities with EHD action are much higher than those in the absence of EHD. Singhal et al [24] studied the flow characteristics of nozzle-diffuser elements at low Reynolds numbers, typical of those found in such micropumps. …”

Section: Integrated Air and Liquid Micropumpsmentioning

confidence: 99%