Geometric optimization of microreactor chambers to increase the homogeneity of the velocity field

Palovics, Peter; Ender, Ferenc; Rencz, M.

doi:10.1088/1361-6439/aab1c3

Cited by 10 publications

(3 citation statements)

References 16 publications

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“…which represents the momentum transfer between the two phases. The magnetic force density of the neodymium magnet on the aggregate phase can be determined from the particle magnetic force, which was shown in Equation (5). Based on this equation and the magnetic moment formula in Equation (2) the magnetic force density is…”

Section: Governing Equationsmentioning

confidence: 99%

“…The most interesting among them is the catalytic reaction rate dependency on the flow rate [4]. In [5] it is presented that when the microreactor is not fully packed with MNPs, the flow goes around the chemically active aggregate, which creates a bypass for the reagents outside the MNP aggregated phase. This is an undesired effect, as only a part of the reagents participate in the reaction.…”

Section: Introductionmentioning

confidence: 99%

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Investigation and Modeling of the Magnetic Nanoparticle Aggregation with a Two-Phase CFD Model

2020

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In this paper the magnetic nanoparticle aggregation procedure in a microchannel in the presence of external magnetic field is investigated. The main goal of the work was to establish a numerical model, capable of predicting the shape of the nanoparticle aggregate in a magnetic field without extreme computational demands. To that end, a specialized two-phase CFD model and solver has been created with the open source CFD software OpenFOAM. The model relies on the supposed microstucture of the aggregate consisting of particle chains parallel to the magnetic field. First, the microstructure was investigated with a micro-domain model. Based on the theoretical model of the particle chain and the results of the micro-domain model, a two-phase CFD model and solver were created. After this, the nanoparticle aggregation in a microchannel in the field of a magnet was modeled with the solver at different flow rates. Measurements with a microfluidic device were performed to verify the simulation results. The impact of the aggregate on the channel heat transfer was also investigated.

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Section: Governing Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation and Modeling of the Magnetic Nanoparticle Aggregation with a Two-Phase CFD Model

2020

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“…This type of coupling is exemplified in the papers selected for this Special Issue. For example, thermal effects on biological lab-on chip devices are discussed in [2], the thermomechanical coupling and the Joule effect play a central role in the thermally actuated switchers that are the subject of [3], coupling between optics and mechanics can be found in the study of micro-optical pressure sensors in [4], electro-mechanical piezoelectric behavior and coupling between mechanical vibration and acoustic signals are fundamental in the PMUT devices described in [6], magnetic fields are used in microreactors in [7]. These diverse effects provide an incomplete but representative picture of the kinds of physical interactions encountered in the field of MEMS and NEMS.…”

mentioning

confidence: 99%

Special issue: multiphysics modeling, simulation and experiments in micro and nanosystems

Corigliano

Lenczner

Rochus

2018

J. Micromech. Microeng.

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Investigation of the motion of magnetic nanoparticles in microfluidics with a micro domain model

Palovics

Rencz

2020

Microsyst Technol

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In this paper the magnetic nanoparticle (MNP) dynamics in a microfluidic device is investigated in the presence of an external magnetic field. The nanoparticles are used for enzyme-substrate reaction measurements, where the enzyme is immobilized to the surface of the nanoparticles. During the measurements the microreactors, called microchambers are filled up with the MNPs where the distribution of the nanoparticles significantly influences the results of the further reaction measurements. In this paper the procedure of the nanoparticle aggregation is investigated numerically in the microchamber in a micro domain simulation space. First the acting forces on the MNPs are examined from the different phenomena. An in-house numerical model is presented where the dynamics of several MNPs are simulated in the micro-size domain. This model is also embedded in the open source CFD software OpenFOAM. The theoretical calculations and the simulations show that the particle-particle interaction due to magnetization plays an important role during the aggregation procedure. The particles in the magnetic field cluster over the time into chains, which phenomenon is in good agreement with the literature. A theoretical model of the chain dynamics is also established, which is compared to the simulation results. The presented micro domain model was later used to improve an Eulerian-Eulerian based two-phase CFD model and solver, which is able to model the complete MNP aggregation procedure in the magnetic field in macroscopic domains.

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Geometric optimization of microreactor chambers to increase the homogeneity of the velocity field

Cited by 10 publications

References 16 publications

Investigation and Modeling of the Magnetic Nanoparticle Aggregation with a Two-Phase CFD Model

Investigation and Modeling of the Magnetic Nanoparticle Aggregation with a Two-Phase CFD Model

Special issue: multiphysics modeling, simulation and experiments in micro and nanosystems

Investigation of the motion of magnetic nanoparticles in microfluidics with a micro domain model

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