Numerical and Experimental Investigations of a Micromixer with Chicane Mixing Geometry

Khaydarov, Valentin; Borovinskaya, Ekaterina; Reschetilowski, Wladimir

doi:10.3390/app8122458

Cited by 41 publications

(35 citation statements)

References 44 publications

(55 reference statements)

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“…Having compared different inlet velocities to the micromixers, one can easily observe that the higher flow rates and the longer micromixer length lead to higher pressure drop inside the micromixer; therefore, the pressure drop gradually increases at the microchannel outlet [54]. In the present paper, the simulation results show that based on the velocity field, although the velocity on the microchannel walls is equal to zero (because of the fluid non-slip condition), it increases at the center.…”

Section: The Effect Of Pressure Drop In Several Inlet Velocities and mentioning

confidence: 61%

“…Therefore, at such low diffusion coefficients, the concept of artificial diffusion is employed to stabilize the numerical solution [52]. In this paper, the Grid Convergence Index (GCI) is handled not only to assay the discretization error but also to verify the quality of the considered mesh [53][54][55]. We apply the GCI approach, take account of three different mesh densities for a simple T-shaped micromixer ( = 90…”

Section: Numerical Solution and Validationmentioning

confidence: 99%

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Numerical analysis of a microfluidic mixer and the effects of different cross-sections and various input angles on its mixing performance

Farahinia

Zhang

2020

J Braz. Soc. Mech. Sci. Eng.

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Micromixers have better efficiency in terms of both the timescale of chemical kinetics and diffusive transport compared to the conventional macro-mixers. The mixing efficiency in micromixers is an important performance indicator in mixers. This paper presents a numerical study of how the design of a micromixer along with the design of the mixing process affects the mixing efficiency. Specifically, two different types of cross-sections of the channel in micromixers, namely circular and rectangular cross-sections, together with the inlet angle of the channel, were studied. The process parameters, such as the inlet velocity of fluids and diffusion coefficient, were studied as well. The result shows that the circular cross-section can sustain a large pressure difference without undergoing any remarkable distortion and deformation, and it can achieve better performance. The result further indicates that the inlet velocity and diffusion coefficient have significant effects on mixing efficiency; specifically, the low inlet velocity and high diffusion coefficient value can lead to a better mixing performance. However, different input angles alone could not make the mixing efficiency change noticeably. In other words, the mixing performance of such micromixers relies more on the inlet velocity and diffusion coefficient than on the fluid flow angle in the inlet. Keywords Micromixers • COMSOL multiphysics • Pressure drop • Input angles • Mixing efficiency • Cross-section List of symbols A Cross-sectional area (m 2) C Concentration of reagents (mol/m 3) D Diffusion coefficient (m 2 /s) F Force (N) f Mole fraction (-) j Diffusion (mol/s m 2) I Identity matrix (-) L Microchannel length (m) M i Mixing efficiency (%) R Change in concentration rate (mol/s m 3) U Velocity (m/s) Density (kg/m 3) Viscosity (Pa s) Standard deviation (-)

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Section: The Effect Of Pressure Drop In Several Inlet Velocities and mentioning

confidence: 61%

Section: Numerical Solution and Validationmentioning

confidence: 99%

Numerical analysis of a microfluidic mixer and the effects of different cross-sections and various input angles on its mixing performance

Farahinia

Zhang

2020

J Braz. Soc. Mech. Sci. Eng.

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“…In other words, the streams slightly penetrate into each other only at their interface, that is, both streams follow the laminar flow path near their distinctive walls of the micromixers. In this case, mixing is diffusion-dominant and M is very low in lack of convective mixing [35]. Under this flow condition, although two counter-rotating vortices form, Dean vortices are not able to fold the streamlines into each other.…”

Section: Simulation Resultsmentioning

confidence: 94%

Inertial Micromixing in Curved Serpentine Micromixers with Different Curve Angles

Alijani

Özbey

Karimzadehkhouei

et al. 2019

Fluids

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Micromixers are of considerable significance in many microfluidics system applications, from chemical reactions to biological analysis processes. Passive micromixers, which rely solely on their geometry, have the advantages of low cost and a less-complex fabrication process. Dean vortices seen in curved microchannels are one of the useful tools to enhance micromixing. In this study, the effects of curve angle on micromixing were experimentally investigated in three curved serpentine micromixers consisting of ten segments with curve angles of 180 ° , 230 ° and 280 ° , at Dean numbers between 12 and 87. To characterize and compare the performance of the micromixers, fluorescence intensity maps and mixing indices were utilized. Accordingly, the micromixer having segments with 280 ° curve angle had significantly higher mixing index values up to the Dean number 60 and outperformed the other two micromixers. This was due to the severe distortion of flow streamlines by Dean vortices and the occurrence of chaotic advection at lower Dean numbers. Beyond the Dean number of 70, no difference was observed in the performance of the micromixers and the mixing index at their outlets had the asymptotic value of 0.93 ± 0.02. Furthermore, the flow behavior of the micromixers was numerically simulated to provide further insight about the mixing phenomena.

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“…The channel structures of these micromixers are relatively simple. By contrast, external energy sources are not required for passive micromixers, but this type of micromixer generally needs to have a complicated channel structure [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 ] or set obstacles [ 20 , 21 , 22 , 23 ] in the microchannel to disturb the laminar flow for solution mixing under a relatively high pressure generated by a syringe pump. The mixing efficiency of passive micromixers is high, but the sealing of a microfluidic chip under high pressure is a challenge.…”

Section: Introductionmentioning

confidence: 99%

Liquid Mixing Based on Electrokinetic Vortices Generated in a T-Type Microchannel

Wang

2021

Micromachines

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This article proposes a micromixer based on the vortices generated in a T-type microchannel with nonuniform but same polarity zeta potentials under a direct current (DC) electric field. The downstream section (modified section) of the outlet channel was designed with a smaller zeta potential than others (unmodified section). When a DC electric field is applied in the microchannel, the electrokinetic vortices will form under certain conditions and hence mix the solution. The numerical results show that the mixing performance is better when the channel width and the zeta potential ratio of the modified section to the unmodified section are smaller. Besides, the electrokinetic vortices formed in the microchannel are stronger under a larger length ratio of the modified section to the unmodified section of the outlet channel, and correspondingly, the mixing performance is better. The micromixer presented in the paper is quite simple in structure and has good potential applications in microfluidic devices.

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Numerical and Experimental Investigations of a Micromixer with Chicane Mixing Geometry

Cited by 41 publications

References 44 publications

Numerical analysis of a microfluidic mixer and the effects of different cross-sections and various input angles on its mixing performance

Numerical analysis of a microfluidic mixer and the effects of different cross-sections and various input angles on its mixing performance

Inertial Micromixing in Curved Serpentine Micromixers with Different Curve Angles

Liquid Mixing Based on Electrokinetic Vortices Generated in a T-Type Microchannel

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