Hudson, S.
(2009),
Poiseuille flow and drop circulation in microchannels, Rheologica ACTA, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=903050
(Accessed February 5, 2025)
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Poiseuille flow and drop circulation in microchannels
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Abstract
Microfluidics aims to control precisely the transport of fluids and suspended particles or drops. Here we calculate two characteristics of interest in rectangular microchannels, as a function of the cross-sectional aspect ratio. First, we present 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. In addition, 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.Citation
Rheologica ACTA
Volume
49
Issue
3
Pub Type
Journals
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Keywords
microfluidics, multiphase flow, droplets, interfacial retardation, Marangoni flow
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Created October 29, 2009, Updated February 19, 2017