Two-Step Numerical Approach To Predict Ferrofluid Droplet Generation and Manipulation inside Multilaminar Flow Chambers

Gómez-Pastora, Jenifer; Roodan, Venoos Amiri; Karampelas, Ioannis; Alorabi, Ali Q.; Tarn, Mark D.; Iles, Alexander; Bringas, Eugenio; Paunov, Vesselin N.; Pamme, Nicole; Furlani, Edward P.; Ortiz, Inmaculada

doi:10.1021/acs.jpcc.9b01393

Cited by 13 publications

(16 citation statements)

References 50 publications

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“…When the flowrate of the glycerol aqueous solution was less than 0.085 mL/min at the fixed dispersed phase flowrate of 10 µL/min, the droplet production augmented significantly linearly proportionally to the flowrate. That was because production frequency and the droplet volume must be inversely related to maintain the flow continuity in the capillary microchannel under the low outer phase fluid flowrate, which was also in good accordance with the previously published conclusion [48]. However, at the fixed dispersed phase flowrate, the bulk liquid metal stream was suppressed and could not smoothly flow out of the inner capillary when the flowrate of the continuous phase was large.…”

Section: Effect Of the Flowrates Of Continuous Phasesupporting

confidence: 90%

Numerical Simulation and Experimental Validation of Liquid Metal Droplet Formation in a Co-Flowing Capillary Microfluidic Device

Jiang

2020

Micromachines

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A two-phase flow axisymmetric numerical model was proposed to understand liquid metal droplet formation in a co-flowing capillary microfluidics device based on a phase field model. The droplet detachment processes were observed in the experiment and are in good agreement with the simulation method. The effects of the viscosities and flowrates of the continuous phase fluid, interfacial tension as well as the wetting property of the metallic needle against the bulk liquid metal on the droplet formation and production rate were numerically investigated. It was found that the droplet diameter decreased with the increment of the viscosities and flowrates of the outer phase carrier fluid. The dispersed phase fluid with high interfacial tension tended to prolong the time for equilibrium between the viscous drag force and interfacial tension on the liquid–liquid fluid surface, delaying the droplet to be pinched off from the capillary orifice and causing large droplet diameter. Finally, the wetting performance of the metallic needle against the liquid metal was explored. The result indicate that the droplet diameter became less dependent on the contact angle while the size distribution of the liquid metal droplet was affected by their wetting performance. A more hydrophilic wetting performance were expected to prepare liquid metal droplet with more monodispersity. The numerical model and simulation results provide the feasibility of predicting the droplet formation with a high surface tension in a glass capillary microfluidic device.

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Section: Effect Of the Flowrates Of Continuous Phasesupporting

confidence: 90%

Numerical Simulation and Experimental Validation of Liquid Metal Droplet Formation in a Co-Flowing Capillary Microfluidic Device

Jiang

2020

Micromachines

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“…For this study, surface tension between the ferrofluid and the aqueous CP was considered to be 5 mN•m −1 , which is the measured value reported in literature. 38 A mean contact angle of 140° is considered for modeling the contact line where the fluid-fluid interface meets the wall.…”

Section: Geometrical Specification Of the Chipmentioning

confidence: 99%

Formation and manipulation of ferrofluid droplets with magnetic fields in a microdevice: a numerical parametric study

et al. 2020

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“…The use of small volumes also facilitates the control of process parameters, such as temperature, pressure, and residence time, etc. 8 , 14 , 17 , 18 …”

Section: Introductionmentioning

confidence: 99%

Recovery of Magnetic Catalysts: Advanced Design for Process Intensification

González-Fernández

Gómez-Pastora

Bringas

et al. 2021

Ind. Eng. Chem. Res.

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The design of microdevices in which components with magnetic character must be separated and recovered from reactive media benefits from the advantages of microfluidics and meets the criteria for process intensification; however, there are open questions, such as the design of the most appropriate magnet arrangement, that need further research in order to increase the magnetic gradient exerted on the particles. Herein, we focus on the continuous recovery of magnetic microparticles, that can be used as support to facilitate the recovery of biocatalysts (magnetic microcatalysts, MMCs) from biological fluids. We analyze and compare the performance of two typical magnetophoretic microdevices for addressing bead recovery: (i) annular channels with a quadrupole orientation of the permanent magnets (quadrupole magnetic sorter, QMS) and (ii) the standard design, which consists of rectangular channels with a single permanent magnet to generate the magnetic field. To this end, an experimentally validated computational fluid dynamics (CFD) numerical model has been employed. Our results reveal that for devices with the same width and length, the micro-QMS, in comparison to a rectangular channel, could accomplish the complete particle retrieval while (i) processing more than 4 times higher fluid velocities, treating more than 360 times higher flow rates or (ii) working with smaller particles, thus reducing by 55% the particle mass. Additionally, the parallel performance of ≈300 micro-QMSs fulfills the processing of flow rates as high as 200 L·h –1 while entirely capturing the magnetic beads. Thereby, this work shows the potential of the QMS advanced design in the intensification of the recovery of catalysts supports of magnetic character.

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Two-Step Numerical Approach To Predict Ferrofluid Droplet Generation and Manipulation inside Multilaminar Flow Chambers

Cited by 13 publications

References 50 publications

Numerical Simulation and Experimental Validation of Liquid Metal Droplet Formation in a Co-Flowing Capillary Microfluidic Device

Numerical Simulation and Experimental Validation of Liquid Metal Droplet Formation in a Co-Flowing Capillary Microfluidic Device

Formation and manipulation of ferrofluid droplets with magnetic fields in a microdevice: a numerical parametric study

Recovery of Magnetic Catalysts: Advanced Design for Process Intensification

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