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Rheologica Acta

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01.03.2010 | Original Contribution

Poiseuille flow and drop circulation in microchannels

verfasst von: Steven D. Hudson

Erschienen in: Rheologica Acta | Ausgabe 3/2010

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Abstract

Microfluidics aims to control precisely the transport of fluids and suspended particles or drops. Two characteristics of such transport in rectangular microchannels are addressed here, as a function of the cross-sectional aspect ratio. First, we highlight a convenient expression for the ratio of the centerline to bulk flow velocities, which is relevant for controlling the flow of suspended or flow-focused objects. Then, using the theory of Nadim and Stone, the droplet circulation fountain-flow pattern in such channels is evaluated explicitly, and implications for interfacial mobility measurements are discussed. For example, when the interface is retarded, part of the fountain reverses direction, thus alleviating stagnation, promoting mixing, and reducing interfacial concentration gradients.

Vorheriger Artikel Lubricated compression and X-ray microtomography to analyse the rheology of a fibre-reinforced mortar

Nächster Artikel Spreading and fingering in a yield-stress fluid during spin coating

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Titel: Poiseuille flow and drop circulation in microchannels
verfasst von: Steven D. Hudson
Publikationsdatum: 01.03.2010
Verlag: Springer-Verlag
Erschienen in: Rheologica Acta / Ausgabe 3/2010
Print ISSN: 0035-4511
Elektronische ISSN: 1435-1528
DOI: https://doi.org/10.1007/s00397-009-0394-4

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