Density effect on the mixing efficiency and flow modes in T-shaped micromixers

Lobasov, A. S.; Минаков, А. В.

doi:10.1051/matecconf/201711507002

Cited by 7 publications

(6 citation statements)

References 6 publications

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“…It was shown in [14][15][16][17][18][19][20][21][22] that the value of the critical Reynolds number depends on the thermophysical properties of mixing fluids. Thus, it was found that as the fluids viscosities ratio increases the critical Reynolds number increases too, but such value doesn't depend on the fluids densities ratio.…”

Section: Figure 1 the Geometric Configuration Of The Taskmentioning

confidence: 99%

Investigation of mixing efficiency and pressure drop in T-shaped micromixers

Lobasov

Минаков

Kuznetsov

et al. 2018

Chemical Engineering and Processing - Process Intensification

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The numerical investigation of the flow regimes in the T-shaped microchannels with different width-to-height aspect ratios of mixing channel was carried out. In the first case, the mixing channel width was varied from 200 m to 1000 m while its height was constant; in the second case, the mixing channel height was varied from 100 m to 2000 m, while its width was constant. The Reynolds number was varied from 5 to 700. The dependences of fluids mixing efficiency and the pressure drop on the Reynolds number at different width-to-height aspect ratios of mixing channel were numerically established. The correlations to determine the critical Reynolds number, as well as the friction factor at different widths and heights of the mixing channel, were proposed. The mixing efficiency, reduced to the pressure drop and the volume unit was analyzed for the first time. The optimal range of parameters in terms of the working efficiency of the micromixer was determined.

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Section: Figure 1 the Geometric Configuration Of The Taskmentioning

confidence: 99%

Investigation of mixing efficiency and pressure drop in T-shaped micromixers

Lobasov

Минаков

Kuznetsov

et al. 2018

Chemical Engineering and Processing - Process Intensification

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“…The numeric technique used in this paper and the results of its testing are described in detail in the papers [23][24][25]. To solve the system of nonlinear differential Equations (1)-(5), we used the finite-volume method (FVM) [36,37].…”

Section: Mathematical Model and Numerical Computation Methodsmentioning

confidence: 99%

“…During the conducted computations, the PD and the ME were calculated. To quantify the mixing efficiency, the parameter M = 1 − (σ/σ 0 ) 0.5 was used [20][21][22][23][24][25]41,42], where…”

Section: Mathematical Model and Numerical Computation Methodsmentioning

confidence: 99%

Analysis of Hydraulic Mixing Efficiency in Widespread Models of Micromixers

Минаков

Lobasov

Shebeleva

et al. 2020

Fluids

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In this paper, we present the results of a systematic numerical study of the flow and mixing modes of fluids in micromixers of various configurations, in particular, an analysis of passive micromixers, the most widely used in practice, as well as the main methods to intensify mixing. The advantages of microstructure reactors can significantly reduce reaction times and increase productivity compared to traditional bulk reactors. Four different geometries of micromixers, including the straight T-shaped microchannel, were considered. The effect of the geometrical patterns of micromixers, as well as of the Reynolds number on flow regimes and mixing efficiency were analyzed. The Reynolds number varied from 1 to 300. Unlike other studies, the efficiency of the considered mixers was for the first time compared with the cost of pressure loss during pumping. As a result, the efficiency of the most optimal micromixer in terms of hydraulic mixing and the optimal operation ranges were determined. It was shown that the maximum normalized mixing efficiency in the entire range of Re numbers was noted for mixer, in which a vortex-based intensification of mixing occurs due to the flow swirling in cylindrical chambers. This mixer allows mixing the fluids 600 times more efficiently than a straight T-mixer, while all other conditions being equal.

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“…That regime is of the greatest interest for researchers because the mixing efficiency increases abruptly in this mode while the pressure drop in the mixing channel increases insignificantly. On the other side, the investigations of mixing of two fluids with different thermophysical properties were carried out by many researchers [14][15][16][17][18][19][20]. For example, a systematic study of the viscosity effect on mixing modes in the T-shaped micromixer was carried out in [14], where the significant effect of viscosities ratio on the flow structure before and after the transition from symmetric to asymmetric flow regimes was shown.…”

Section: Introductionmentioning

confidence: 99%

“…The self-similar behaviour of the asymmetric flow regime was observed. A systematic study of the density effect on mixing modes in the T-shaped micromixer was carried out in [15], and it was shown that the change in the density of one of the miscible fluids does not lead to a shift of flow regimes. However, a significant flow asymmetry in the region before its transition to the engulfment flow mode was observed.…”

Section: Introductionmentioning

confidence: 99%

The Study of Ethanol and Water Mixing Modes in the T-shaped Micromixers

Lobasov¹,

Минаков²,

Лобасов³

et al. 2019

J. Sib. Fed. Univ., Math. phys.

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The study of regimes of ethanol and water mixing was carried out using numerical simulation, and the dependence of the mixing efficiency of these fluids on the Reynolds number was defined. In the course of the numerical investigation, a significant effect of the differences in the viscosities and densities of the miscible fluids on the flow regimes and the mixing efficiency of these two fluids was found. The distributions of pressure, components concentration and velocity in the micromixer were obtained. The dependence of the fluids mixing efficiency and pressure drop on the Reynolds number, as well as the map of flow and mixing regimes were determined. The nonlinear dependence of the mixture thermophysical properties on the ethanol concentration was taken into account. It was found that the last one results in much higher pressure drop comparing to the case of the water-water mixing. Moreover, an inflection was observed in the dependence of the pressure drop on the Reynolds number for the water-ethanol mixing at the transition of the flow in a micromixer to the engulfment regime.

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Density effect on the mixing efficiency and flow modes in T-shaped micromixers

Cited by 7 publications

References 6 publications

Investigation of mixing efficiency and pressure drop in T-shaped micromixers

Investigation of mixing efficiency and pressure drop in T-shaped micromixers

Analysis of Hydraulic Mixing Efficiency in Widespread Models of Micromixers

The Study of Ethanol and Water Mixing Modes in the T-shaped Micromixers

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