Multiphase fluid flow and heat transfer characteristics in microchannels

Kumar, Vimal; Vikash,; Nigam, K.D.P.

doi:10.1016/j.ces.2017.01.018

Cited by 43 publications

(2 citation statements)

References 192 publications

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“…As an extensively adopted flow mode, gas–liquid (G–L) or liquid–liquid (L–L) two-phase flows in microscale and their phenomena are often encountered in various fundamental microchemical engineering processes, including absorption, , extraction, , reaction, − and heat-mass transfer. − However, with the rapid development of microchemical engineering, the operation objects of the current two-phase flow mode are still restricted, thus urgently requiring the investigation of the complicated liquid–liquid–liquid (L–L–L) three-phase flow. In multiphase flows, the flow pattern, also referred to as the multiphase topological structure, is always employed to describe the action modes between phases, which obviously determines the heat-mass transport and reaction performance.…”

Section: Introductionmentioning

confidence: 99%

Dimensionless Analyses of Liquid–Liquid–Liquid Three-Phase Flow Patterns in a Confined Microchannel

Tao

Zhang

et al. 2023

Ind. Eng. Chem. Res.

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The flow pattern transition of a liquid−liquid− liquid three-phase flow in a confined microchannel has been ascertained by systematic numerical simulations with a volume of fluid-continuum surface force (VOF-CSF) model. Three typical flow patterns of the liquid−liquid−liquid three-phase flow can be distinguished by the flow field structures, namely, plug, slug, and blocked-slug. Further, the effects of the key dimensionless numbers on the quantitative transition laws of flow patterns are intensively investigated. It is found that the transition from plug to slug is only determined by the capillary number of the outer phase. However, as for the transition from slug to blocked-slug, it can be significantly regulated by the coupling of all involved dimensionless numbers. In addition, to reveal the underlying mechanisms of flow pattern transition, the force field characteristics have been thoroughly discussed. The results indicate that, in plug flow, the Laplace pressure force acting on the outer interface is dominant. Once the pressure differential force and shear force together acting on the outer interface overcome the Laplace pressure force, the flow pattern of the slug emerges. As the pressure differential force and the shear force acting on the inner interface increase, the flow pattern falls into the blocked-slug because of an enhanced hindering effect of the inner interface on the deformation of the outer interface. The results offer a theoretical guide for precisely controlling the liquid−liquid−liquid three-phase flow behaviors to fulfill the process intensification of microfluids in a confined microchannel.

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Section: Introductionmentioning

confidence: 99%

Dimensionless Analyses of Liquid–Liquid–Liquid Three-Phase Flow Patterns in a Confined Microchannel

Tao

Zhang

et al. 2023

Ind. Eng. Chem. Res.

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“…FIS have been used in macroscopic equipment for increasing heat transfer performance and to obtain narrow RTDs [39,[47][48][49]. However, a comparative study of its effectiveness against different geometrical modifications of Herringbone micromixers is required as a mean to determine which one obtains the highest mass transfer rates to a reactive boundary.…”

Section: Introductionmentioning

confidence: 99%

Process intensification through staggered herringbone micro-channels: Mass transfer enhancement to a reactive wall

Cantú-Pérez¹,

López-Guajardo

Romero-Flores

et al. 2020

Chemical Engineering and Processing - Process Intensification

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In the present study, the flow behaviour through different micro-herringbone channels configurations (1-peak, 2-peak, 1-2 alternated peak herringbone channel and a flow inversion geometry) have been numerically analysed as a mean of intensifying mass transfer to a reactive boundary. Results showed that the mass transfer coefficients were higher for the 1-2 alternated herringbone structure than those with, either, 1-peak or 2-peak structures. Moreover, the flow inversion structure mass transfer coefficients were double those obtained for the staggered herringbone channel. The alternated herringbone channel combines a different set of herringbone structures that are efficient at removing the boundary layer at different parts of the channel. The combination of these structures provide an enhanced mass transfer performance as compared to a standard herringbone channel. The obtained results showed that a 2D simplified model which uses hydrodynamic data from CFD simulations is a reasonable substitute for full 3D particle tracking simulations in terms of the mass transfer behavior of the 1PSHC with a 97.5% of accuracy related to the asymptotic Sherwood number.The mixing capacity of the herringbones was accounted for by an apparent effective diffusion coefficient. The agreement between the 3D and 2D simulation was reasonable.

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Characteristics of Gas-Liquid Slug Flow in Microchannel by Instantaneous Liquid Film Thickness Measurement

Sun

Chen

et al. 2022

J. Therm. Sci.

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Multiphase fluid flow and heat transfer characteristics in microchannels

Cited by 43 publications

References 192 publications

Dimensionless Analyses of Liquid–Liquid–Liquid Three-Phase Flow Patterns in a Confined Microchannel

Dimensionless Analyses of Liquid–Liquid–Liquid Three-Phase Flow Patterns in a Confined Microchannel

Process intensification through staggered herringbone micro-channels: Mass transfer enhancement to a reactive wall

Characteristics of Gas-Liquid Slug Flow in Microchannel by Instantaneous Liquid Film Thickness Measurement

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