Liquid–liquid two-phase mass transfer in T-type micromixers with different junctions and cylindrical pits

A numerical study on the hydrodynamics of ferrofluid flow and mass transfer characteristics in a Y‐type micromixer is performed. Computational fluid dynamics (CFD) simulation is accomplished to survey the behavior of ferrofluid flow subject to an external magnetic field and to specify its effect on the mass transfer between two immiscible liquid phases. The geometric reconstruction scheme (Geo‐Reconstruct) based on piecewise linear interpolation is applied to reconstruct the two‐phase interface. The results of CFD modeling are validated by experimental data, and good agreements are achieved, with a maximum relative error for the extraction efficiency of about 7.52 %. This research work shows that ferrofluid stimulation by a magnetic field can be an efficient mixing factor in microdevices.

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“…The extraction efficiencies (E) of succinic acid in this table were calculated according to Eq. ( 18) [20,29]:…”

Section: Cfd Results Of the Mass Transfer Characteristicsmentioning

confidence: 99%

Numerical Study of Mixing and Mass Transfer in a Micromixer by Stimulation of Magnetic Nanoparticles in a Magnetic Field

2021

Self Cite

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“…Despite the excellent series of results, there are also many exciting challenges for our future work, primarily focusing on mixing technologies, enhancing micromixers’ performance, and design aided by physical simulation. Hosseini Kakavandi et al [ 38 ] investigated mass transfer characteristics in micromixers by varying the junctions and channel shapes of the mixers. Their study demonstrated that the T-shaped mixer’s junction shape and pit diameter critically affected the mass transfer coefficients as chaotic advection was generated by the modification of the mixing channel shape.…”

Section: Resultsmentioning

confidence: 99%

Understanding Interdependencies between Mechanical Velocity and Electrical Voltage in Electromagnetic Micromixers

Kim

Chan

et al. 2020

Micromachines

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Micromixers are critical components in the lab-on-a-chip or micro total analysis systems technology found in micro-electro-mechanical systems. In general, the mixing performance of the micromixers is determined by characterising the mixing time of a system, for example the time or number of circulations and vibrations guided by tracers (i.e., fluorescent dyes). Our previous study showed that the mixing performance could be detected solely from the electrical measurement. In this paper, we employ electromagnetic micromixers to investigate the correlation between electrical and mechanical behaviours in the mixer system. This work contemplates the “anti-reciprocity” concept by providing a theoretical insight into the measurement of the mixer system; the work explains the data interdependence between the electrical point impedance (voltage per unit current) and the mechanical velocity. This study puts the electromagnetic micromixer theory on a firm theoretical and empirical basis.

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“…The liquid− liquid systems used in this study were chosen because they could be representative of typical liquid−liquid reactive systems spanning a wide range of interfacial tensions (0.6− 23.91 mN/m) and viscosities (6.8 × 10 −4 −4.6 × 10 −1 Pa•s), since most of the liquid−liquid systems used for flow mapping are related to liquid−liquid extraction within a range of interfacial tension. 19,32,36 For the flow of immiscible fluids through the coiled tubes, the most important parameters to consider are the properties of the fluids used and the wettability of the surface. However, a hydrophilic surface (borosilicate glass without any surface treatment) was used for all experiments carried out to construct a flow map which can be used to predict the flow behavior obtained in a stainless steel tube (hydrophilic surface) reported in ref 21.…”

Section: Methodsmentioning

confidence: 99%

“…Biodiesel and glycerol were obtained by carrying out the transesterification reaction in a batch reactor following the methodology proposed in ref . The liquid–liquid systems used in this study were chosen because they could be representative of typical liquid–liquid reactive systems spanning a wide range of interfacial tensions (0.6–23.91 mN/m) and viscosities (6.8 × 10 –4 –4.6 × 10 –1 Pa·s), since most of the liquid–liquid systems used for flow mapping are related to liquid–liquid extraction within a range of interfacial tension. ,, …”

Section: Methodsmentioning

confidence: 99%

Liquid–Liquid Flow Pattern Visualization and Mapping in a Millimetric Size Coiled Tube

López-Guajardo

Garza-Cantú

Marques-Camarena

et al. 2018

Ind. Eng. Chem. Res.

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Three different liquid−liquid systems were experimentally studied for flow pattern visualization in a helically coiled geometry. For the sunflower oil−water system, interfacial forces overcome inertial forces leading to slug flow patterns, contrary to the biodiesel−glycerol system in which inertial forces dominate over interfacial forces resulting in parallel-like flow patterns. For the sunflower oil−methanol system, a transition zone from slug flow patterns to parallel flow patterns was observed. A Weber−Ohnesourge flow map (WOFM) was developed for a wide range of interfacial tension, viscosities, and flow conditions, which predicts different flow patterns. This flow map is an important tool for the design of liquid−liquid processing equipment, which depends on the device geometry. The proposed WOFM was used to predict the flow patterns in a reactive liquid−liquid system, showing good agreement with the reactor performance and the flow map predictions.

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Liquid–liquid two-phase mass transfer in T-type micromixers with different junctions and cylindrical pits

Cited by 22 publications

References 40 publications

Numerical Study of Mixing and Mass Transfer in a Micromixer by Stimulation of Magnetic Nanoparticles in a Magnetic Field

Numerical Study of Mixing and Mass Transfer in a Micromixer by Stimulation of Magnetic Nanoparticles in a Magnetic Field

Understanding Interdependencies between Mechanical Velocity and Electrical Voltage in Electromagnetic Micromixers

Liquid–Liquid Flow Pattern Visualization and Mapping in a Millimetric Size Coiled Tube

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