Micromixing enhanced by pulsating flows

Mao, Wenbin; Xu, Jinliang

doi:10.1016/j.ijheatmasstransfer.2009.06.011

Cited by 25 publications

(5 citation statements)

References 14 publications

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“…It will be important, in future work, to determine the threshold for the onset of time dependent flows which, in particular, may enhance the interpenetration of the different fluids involved. 25,26…”

Section: Physics Of Fluidsmentioning

confidence: 99%

Three-dimensional flow structures in X-shaped junctions: Effect of the Reynolds number and crossing angle

et al. 2019

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We study numerically the three-dimensional (3D) dynamics of two facing flows in an X-shaped junction of two circular channels crossing at an angle α. The distribution of the fluids in the junction and in the outlet channels is determined as a function of α and the Reynolds number Re. Our goal is to describe the different flow regimes in the junction and their dependence on α and Re. We also explore to which extent two-dimensional (2D) simulations are able to describe the flow within a 3D geometry. In the 3D case, at large Re's (≳50) and α's (≳60 ○ ), axial vorticity (i.e., parallel to the outlet axis) of magnitude increasing both with α and Re develops in the outlet channels and cannot be reproduced by 2D numerical simulations. At lower angles (α ≲ 60 ○ ), instead, a mean vorticity component perpendicular to the junction plane is present: both its magnitude and the number of the corresponding vortices (i.e., recirculation zones) increase as α decreases. These vortices appear in both 2D and 3D simulations but at different threshold values of α and Re. At very low Re's (≲5) and α's (∼15 ○ ), the flow structure in 3D simulations is nearly 2D but its quantitative characteristics differ from 2D simulations. As Re increases, this two-dimensionality disappears, while vortices due to flow separation appear in the outlet channels.

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Section: Physics Of Fluidsmentioning

confidence: 99%

Three-dimensional flow structures in X-shaped junctions: Effect of the Reynolds number and crossing angle

et al. 2019

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“…Jacobson et al [3] documented the results of a dilution experiment for various sample fractions with electrokinetically driven parallel and serial active micromixers. Mao and Xu [4] uncovered the enhancement in the mixing numerically for T-shaped micromixers with pulsating flow. Cho et al [5] proposed crisscross micromixer with aperiodic time-varying electrokinetic perturbing flows.…”

Section: Introductionmentioning

confidence: 98%

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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“…[ 43 ] According to Zhu et al, [ 44 ] mixing in gas and liquid phases is enhanced through means of fluid shear. Studies on mixing in microchannels using oscillatory flow have been undertaken by several researchers, [ 45–47 ] some of whom concluded that semi‐pulsatile and fully pulsatile flow results improved mixing in comparison to non‐pulsating continuous flows due to the periodic stretching of the interface, which they found through numerical simulation and experiments. Further, Reis et al, [ 48 ] Ferreira et al, [ 49 ] Torab‐Mostaedi et al, [ 50 ] and Hewgill et al [ 51 ] reported enhancement in mass transfer due to pulsations.…”

Section: Introductionmentioning

confidence: 99%

Optimization of semi‐pulsatile liquid‐liquid extraction operations in milli‐channels

2021

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The work in this manuscript presents liquid‐liquid extraction augmentation and optimization due to flow pulsations on a continuous flow. The mass transfer is achieved via a transfer species (acetic acid) that diffuses in the aqueous phase (water), which is in a continuous flow, from the organic phase (toluene), exhibiting pulsed flow pattern. It is observed through experiments that the incorporation of pulsation leads to enhanced extraction/mass transfer compared to continuous flows. Also, an increase of the pulsation parameters, such as amplitude and frequency, increases the mass transfer, but when the process is evaluated in terms of economy, it is found that the rate of extraction per unit power is maximum for moderate frequencies and amplitudes. Based on the experiments, a Linton and Sherwood‐like correlation for determining extracted concentration at the exit of the test section in semi‐pulsatile flow conditions is proposed. During the course of experiments, it is found that the flow pattern changes from dispersed‐type flow pattern of the organic phase to slug and then slug dispersed with an increase of superficial velocity of toluene, at a particular superficial velocity of the water. Also, the total power consumed during the extraction process increases with an increase in the product of amplitude and frequency. With the experimental approach presented in this paper, one will be able to optimize semi‐pulsatile liquid‐liquid mass transfer operations.

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Micromixing enhanced by pulsating flows

Cited by 25 publications

References 14 publications

Three-dimensional flow structures in X-shaped junctions: Effect of the Reynolds number and crossing angle

Three-dimensional flow structures in X-shaped junctions: Effect of the Reynolds number and crossing angle

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

Optimization of semi‐pulsatile liquid‐liquid extraction operations in milli‐channels

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