Local flow dynamics in the motion of slug bubbles in a flowing mini square channel

Azadi, Reza; Nobes, David S.

doi:10.1016/j.ijheatmasstransfer.2021.121588

Cited by 7 publications

(6 citation statements)

References 41 publications

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“…The deformation of the capsule and its internal flow topology affect the performance of microfluidic devices or the procedures they are used in. For this purpose, several studies have investigated the effect of geometry on the topology of droplets and bubbles [129][130][131][132][133][134][135][136] and these are reviewed in this section.…”

Section: The Liquid-liquid Two Phased Flow In Curved Channelsmentioning

confidence: 99%

The Physics and Manipulation of Dean Vortices in Single- and Two-Phase Flow in Curved Microchannels: A Review

Saffar,

Kashanj,

Nobes

et al. 2023

Micromachines

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Microchannels with curved geometries have been employed for many applications in microfluidic devices in the past decades. The Dean vortices generated in such geometries have been manipulated using different methods to enhance the performance of devices in applications such as mixing, droplet sorting, and particle/cell separation. Understanding the effect of the manipulation method on the Dean vortices in different geometries can provide crucial information to be employed in designing high-efficiency microfluidic devices. In this review, the physics of Dean vortices and the affecting parameters are summarized. Various Dean number calculation methods are collected and represented to minimize the misinterpretation of published information due to the lack of a unified defining formula for the Dean dimensionless number. Consequently, all Dean number values reported in the references are recalculated to the most common method to facilitate comprehension of the phenomena. Based on the converted information gathered from previous numerical and experimental studies, it is concluded that the length of the channel and the channel pathline, e.g., spiral, serpentine, or helix, also affect the flow state. This review also provides a detailed summery on the effect of other geometric parameters, such as cross-section shape, aspect ratio, and radius of curvature, on the Dean vortices’ number and arrangement. Finally, considering the importance of droplet microfluidics, the effect of curved geometry on the shape, trajectory, and internal flow organization of the droplets passing through a curved channel has been reviewed.

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Section: The Liquid-liquid Two Phased Flow In Curved Channelsmentioning

confidence: 99%

The Physics and Manipulation of Dean Vortices in Single- and Two-Phase Flow in Curved Microchannels: A Review

Saffar,

Kashanj,

Nobes

et al. 2023

Micromachines

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“…Recently, the PTV method has also been applied to measure the velocity field [158][159][160]. Azadi & Nobes [161] explored the liquid flow velocity around a slug bubble, especially in the thin film and at the corners, in a square mini-channel (3 mm×3 mm) (Fig. 11g).…”

Section: Local Liquid Velocitymentioning

confidence: 99%

“…(g) Liquid velocity vectors around a bubble measured by PTV technique. Reproduced with permission from Ref [161],. copyright (2021) Elsevier…”

mentioning

confidence: 99%

Microfluidic-based chemical absorption technology for CO2 capture: Mass transfer dynamics, operating factors and performance intensification

Cheng

Fan

Tarlet

et al. 2023

Renewable and Sustainable Energy Reviews

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“…On the other hand, the main disadvantages in the use of PTV reside in the high sensitivity to noise, the appearance/disappearance of particles within the single image due to transverse motions to the illuminated plane, and the superposition of the particles, which complicates their correct identification. Traditionally, this technique is widely used to study small-scale flows (Azadi and Nobes [149]) and to low-particle density flows (Cornic et al [150]) but recently its use has also been expanded to large-scale indoor airflows (Fu et al [151]) and to the investigation of the near-wall regions (Fu et al [152]). Further recent studies used PTV to study the combustion of methane hydrate over a powder layer (Misyura et al [153]), the activation of the low reactivity industrial fuel (Egorov et al [154]), the effect of highspeed jets in highly abrasive environments (Riha et al [155]), and velocity measurements in porous media (Sabbagh et al [156]).…”

Section: Digital Image Analysis (Dia) Techniquesmentioning

confidence: 99%

A Review of Laboratory and Numerical Techniques to Simulate Turbulent Flows

Ferrari

Rossi²,

Bernardino

2022

Energies

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Turbulence is still an unsolved issue with enormous implications in several fields, from the turbulent wakes on moving objects to the accumulation of heat in the built environment or the optimization of the performances of heat exchangers or mixers. This review deals with the techniques and trends in turbulent flow simulations, which can be achieved through both laboratory and numerical modeling. As a matter of fact, even if the term “experiment” is commonly employed for laboratory techniques and the term “simulation” for numerical techniques, both the laboratory and numerical techniques try to simulate the real-world turbulent flows performing experiments under controlled conditions. The main target of this paper is to provide an overview of laboratory and numerical techniques to investigate turbulent flows, useful for the research and technical community also involved in the energy field (often non-specialist of turbulent flow investigations), highlighting the advantages and disadvantages of the main techniques, as well as their main fields of application, and also to highlight the trends of the above mentioned methodologies via bibliometric analysis. In this way, the reader can select the proper technique for the specific case of interest and use the quoted bibliography as a more detailed guide. As a consequence of this target, a limitation of this review is that the deepening of the single techniques is not provided. Moreover, even though the experimental and numerical techniques presented in this review are virtually applicable to any type of turbulent flow, given their variety in the very broad field of energy research, the examples presented and discussed in this work will be limited to single-phase subsonic flows of Newtonian fluids. The main result from the bibliometric analysis shows that, as of 2021, a 3:1 ratio of numerical simulations over laboratory experiments emerges from the analysis, which clearly shows a projected dominant trend of the former technique in the field of turbulence. Nonetheless, the main result from the discussion of advantages and disadvantages of both the techniques confirms that each of them has peculiar strengths and weaknesses and that both approaches are still indispensable, with different but complementary purposes.

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Local flow dynamics in the motion of slug bubbles in a flowing mini square channel

Cited by 7 publications

References 41 publications

The Physics and Manipulation of Dean Vortices in Single- and Two-Phase Flow in Curved Microchannels: A Review

The Physics and Manipulation of Dean Vortices in Single- and Two-Phase Flow in Curved Microchannels: A Review

Microfluidic-based chemical absorption technology for CO2 capture: Mass transfer dynamics, operating factors and performance intensification

A Review of Laboratory and Numerical Techniques to Simulate Turbulent Flows

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