Mixing of Particles in Micromixers under Different Angles and Velocities of the Incoming Water

Karvelas, Evangelos; Liosis, Christos; Karakasidis, Theodoros E.; Sarris, Ioannis E.

doi:10.3390/proceedings2110577

Cited by 8 publications

(7 citation statements)

References 9 publications

(11 reference statements)

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“…However, the removal of heavy metal ions from water has been a vital and challenging issue for several decades [47,48], without reaching the heart of the problem. On the other hand, in recent years nanotechnology has been integrated with several novel techniques for the removal of heavy metals from water systems to improve removal efficiency [49][50][51].…”

Section: Heavymentioning

confidence: 99%

Heavy Metal Adsorption Using Magnetic Nanoparticles for Water Purification: A Critical Review

et al. 2021

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Research on contamination of groundwater and drinking water is of major importance. Due to the rapid and significant progress in the last decade in nanotechnology and its potential applications to water purification, such as adsorption of heavy metal ion from contaminated water, a wide number of articles have been published. An evaluating frame of the main findings of recent research on heavy metal removal using magnetic nanoparticles, with emphasis on water quality and method applicability, is presented. A large number of articles have been studied with a focus on the synthesis and characterization procedures for bare and modified magnetic nanoparticles as well as on their adsorption capacity and the corresponding desorption process of the methods are presented. The present review analysis shows that the experimental procedures demonstrate high adsorption capacity for pollutants from aquatic solutions. Moreover, reuse of the employed nanoparticles up to five times leads to an efficiency up to 90%. We must mention also that in some rare occasions, nanoparticles have been reused up to 22 times.

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Section: Heavymentioning

confidence: 99%

Heavy Metal Adsorption Using Magnetic Nanoparticles for Water Purification: A Critical Review

et al. 2021

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“…The sizes of the computational grids for each of the micromixer ducts studied here are presented in Table 1 and were adequate for the low Reynolds number of the current flow for which the maximum value was Re = U 0 * d e ν ≃ 2 * 10 −2 based on the equivalent diameter de and the mean velocity U 0 . Details of numerical models, forces, and moment terms used in the equations are given in [37,38].…”

Section: Geometry and Simulation Parametersmentioning

confidence: 99%

“…Micromixer geometry of the Y-shaped square duct and water-particles inlet and outlet flow directions. θ is the angle between the two inlet ducts[37].…”

mentioning

confidence: 99%

Micromixing Efficiency of Particles in Heavy Metal Removal Processes under Various Inlet Conditions

Karvelas

Liosis

Benos

et al. 2019

Water

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Water quality problems are a persistent global issue since population growth has continually stressed hydrological resources. Heavy metals released into the environment from plating plants, mining, and alloy manufacturing pose a significant threat to the public health. A possible solution for water purification from heavy metals is to capture them by using nanoparticles in micromixers. In this method, conventionally heavy metal capture is achieved by effectively mixing two streams, a particle solution and the contaminated water, under the action of external magnetic fields. In the present study, we investigated the effective mixing of iron oxide nanoparticles and water without the use of external magnetic fields. For this reason, the mixing of particles and the contaminated water was studied for various inlet velocity ratios and inflow angles of the two streams using computational fluid dynamics techniques. The Navier-Stokes equations were solved for the water flow, the discrete motion of particles was evaluated by a Lagrangian method, while the flow of substances of the contaminated water was studied by a scalar transport equation. Results showed that as the velocity ratio between the inlet streams increased, the mixing of particles with the contaminated water was increased. Therefore, nanoparticles were more uniformly distributed in the duct and efficiently absorbed the substances of the contaminated water. On the other hand, the angle between two streams was found to play an insignificant role in the mixing process. Consequently, the results from this study could be used in the design of more compact and cost efficient micromixer devices.

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“…The incompressible Navier-Stokes equations are solved in the Eulerian frame, for the pressure p and velocity u, together with a model for the discrete motion of particles in a Lagrangian frame. Governing equations of the fluid phase are given by [6]:…”

Section: Casementioning

confidence: 99%

“…Computational fluid dynamics (CFD) and micromixers may offer a solution to contaminated water from heavy metal ions [6][7][8]. The majority of experimental water purification methods involve magnetic nanoparticles due to their physicochemical properties [9].…”

Section: Introductionmentioning

confidence: 99%

A Tesla Valve as a Micromixer for Fe3O4 Nanoparticles

et al. 2022

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A large number of microfluidic applications are based on effective mixing. In the application of water purification, the contaminated water needs to be effectively mixed with a solution that is loaded with nanoparticles. In this work, the Tesla valve was used as a micromixer device in order to evaluate the effect of this type of geometry on the mixing process of two streams. For this reason, several series of simulations were performed in order to achieve an effective mixing of iron oxide nanoparticles and contaminated water in a duct. In the present work, a stream loaded with Fe3O4 nanoparticles and a stream with contaminated water were numerically studied for various inlet velocity ratios and initial concentrations between the two streams. The Navier–Stokes equations were solved for the water flow and the discrete motion of particles was evaluated by the Lagrangian method. Results indicate that the Tesla valve can be used as a micromixer since mixing efficiency reached up to 63% for Vp/Vc = 20 under various inlet nanoparticles rates for the geometry of the valve that was used in this study.

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Mixing of Particles in Micromixers under Different Angles and Velocities of the Incoming Water

Cited by 8 publications

References 9 publications

Heavy Metal Adsorption Using Magnetic Nanoparticles for Water Purification: A Critical Review

Heavy Metal Adsorption Using Magnetic Nanoparticles for Water Purification: A Critical Review

Micromixing Efficiency of Particles in Heavy Metal Removal Processes under Various Inlet Conditions

A Tesla Valve as a Micromixer for Fe3O4 Nanoparticles

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