A double MRT-LBM for simulation of mixing in an active micromixer with rotationally oscillating stirrer in high Peclet number flows

Khozeymeh-Nezhad, Hojjat; Niazmand, Hamid

doi:10.1016/j.ijheatmasstransfer.2018.02.033

Cited by 25 publications

(3 citation statements)

References 21 publications

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“…The mixing cost and mixing energy cost were calculated for the chicanes micromixer at different volume flow rates (Table 1) [36][37][38][39]. The highest mixing cost was obtained at low volume flow rates.…”

Section: Pressure Dropmentioning

confidence: 99%

Numerical and Experimental Investigations of a Micromixer with Chicane Mixing Geometry

2018

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A micromixer is a new type of chemical engineering equipment used to intensify the mixing process. This article provides details on flow regimes in microchannels with a complex geometry, such as with chicane mixing geometry. Experiments involving water, ink, and a micro digital camera have determined both the micromixer’s initial mixing zone, and also the streamlines. Computational fluid dynamics (CFD) modelling helped identify the mechanism of stimulating effect; swirling and recirculation were identified as two special cases of the convective mixing process. To characterize the degree of mixing, a function of volume flow rate was proposed. A much higher degree of mixing in vortex flow compared to stratified flow was observed. The relationship between laminar flow and vortices shows a square-law dependence of pressure drop against the volume flow rate. The mixing cost and the mixing energy cost at Reynolds number of 50 are higher for the chicane micromixer than for micromixers without chicanes geometry.

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Section: Pressure Dropmentioning

confidence: 99%

Numerical and Experimental Investigations of a Micromixer with Chicane Mixing Geometry

2018

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“…An optimum design is presented in terms of minimum flow impedance and the best mixing efficiency. Khozeymeh-Nezhad [19] and Niazmand simulated an active micromixer with an oscillating stirrer and, by using non-dimensional parameters, presented an optimum model in terms of mixing efficiency.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Mixing by Induced Electrokinetic Flow in T-Micromixer with Conductive Curved Arc Plate

et al. 2021

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Mixing is essential in microdevices. Therefore, increasing the mixing efficiency has a significant influence on these devices. Using conductive obstacles with special geometry can improve the mixing quality of the micromixers. In this paper, a numerical study on the mixing caused by an induced-charge electrokinetic micromixer was carried out using a conductive plate with a curved arc shape instead of a conductive flat plate or other non-conductive obstacles for Newtonian fluids. This study also explored the effect of the different radius curves, span length, the number of curved arc plates in the channel, the pattern of arrangement, concavity direction, and the orientation angle against the flow on the mixing. Furthermore, the efficiency of the T-micromixer against a flow with a low diffusion coefficient was investigated. It should be noted that the considered channel is symmetric regarding to the middle horizontal plane and an addition of flat plate reflects a formation of symmetric flow structures that do not allow to improve the mixture process. While an addition of non-symmetric curved arc plates al-lows to increase the mixing by creating vortices. These vortices were created owing to the non-uniform distribution of induced zeta potential on the curved arc plate. A rise in the span length of the curved arc plate when the radius was constant improved the mixing. When three arc plates in one concavity direction were used, the mixing efficiency was 91.86%, and with a change in the concavity direction, the mixing efficiency increased to 95.44%. With a change in the orientation angle from 0 to 25, the mixing efficiency increased by 19.2%.

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“…Ebrahimi et al [6] numerically investigated mixing enhancement in a T-shaped microchannel with electroosmotic-pressure driven flow. Khozeymeh-Nezhad and Niazmand [7] performed a double MRT-LBM simulation for oscillating rectangular stirrer in a micromixer. Meng et al [8] documented that the mixing performance increases with four arc-electrodes placed around a ring-shape microchamber.…”

Section: Introductionmentioning

confidence: 99%

Constructal branched micromixers with enhanced mixing efficiency: Slender design, sphere mixing chamber and obstacles

Çetkin

Miguel

2019

International Journal of Heat and Mass Transfer

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A double MRT-LBM for simulation of mixing in an active micromixer with rotationally oscillating stirrer in high Peclet number flows

Cited by 25 publications

References 21 publications

Numerical and Experimental Investigations of a Micromixer with Chicane Mixing Geometry

Numerical and Experimental Investigations of a Micromixer with Chicane Mixing Geometry

Numerical Investigation of Mixing by Induced Electrokinetic Flow in T-Micromixer with Conductive Curved Arc Plate

Constructal branched micromixers with enhanced mixing efficiency: Slender design, sphere mixing chamber and obstacles

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