Journal ArticleDOI
Two-phase flow regimes in microchannels
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In this article, an analysis of published data on a gas-liquid two-phase flow in capillaries of various shapes is given, which makes it possible to systematize the collected body of information.Abstract:
Capillary hydrodynamics has three considerable distinctions from macrosystems: first, there is an increase in the ratio of the surface area of the phases to the volume that they occupy; second, a flow is characterized by small Reynolds numbers at which viscous forces predominate over inertial forces; and third, the microroughness and wettability of the wall of the channel exert a considerable influence on the flow pattern. In view of these differences, the correlations used for tubes with a larger diameter cannot be used to calculate the boundaries of the transitions between different flow regimes in microchannels. In the present review, an analysis of published data on a gas-liquid two-phase flow in capillaries of various shapes is given, which makes it possible to systematize the collected body of information. The specific features of the geometry of a mixer and an inlet section, the hydraulic diameter of a capillary, and the surface tension of a liquid exert the strongest influence on the position of the boundaries of two-phase flow regimes. Under conditions of the constant geometry of the mixer, the best agreement in the position of the boundaries of the transitions between different hydrodynamic regimes in capillaries is observed during the construction of maps of the regimes with the use of the Weber numbers for a gas and a liquid as coordinate axes.read more
Citations
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Review on hydrodynamics and mass transfer in minichannel wall reactors with gas-liquid Taylor flow
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Tuan A. Ho,Alberto Striolo +1 more
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References
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TL;DR: In this article, the authors provided a partial theory of the indicator bubble commonly used to measure liquid flowrates in capillaries, and showed that the bubble will not rise at all if where ρ is the difference in density between the fluids inside and outside the bubble.
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Gas–liquid two-phase flow in microchannels Part I: two-phase flow patterns
TL;DR: In this paper, a systematic experimental investigation of two-phase flow patterns in microchannels was the objective of this study, using air and water, experiments were conducted in circular micro channels with 1.1 and 1.45mm inner diameters, and in semi-triangular (triangular with one corner smoothed) cross-sections with hydraulic diameters 1.09 and 149mm.
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Mechanism for flow-rate controlled breakup in confined geometries: a route to monodisperse emulsions.
TL;DR: This Letter describes a quasistationary breakup of an immiscible, inviscid fluid at low capillary numbers, which forms the basis for controlled, high-throughput generation of monodisperse fluid dispersions.
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Multiphase monolith reactors: Chemical reaction engineering of segmented flow in microchannels
TL;DR: The use of segmented flow in capillaries, also known as Taylor flow, for reaction engineering purposes has soared in recent years as mentioned in this paper, with an emphasis on the underlying principles.