LASP and Villermaux/Dushman protocols for mixing performance in microchannels: Effect of geometry on micromixing characterization and size reduction

The influence of feeding point in conventional stirred tank reactor and flow characteristics in micro‐reactor on the microstructure of Cu‐ZnO catalyst was studied. Cu‐Zn distribution in co‐precipitate was characterized by EDS and Zn fraction in zincian malachite was estimated from the 20 true1¯ peak shift in XRD pattern. The theory analysis and experimental results, combining with measurement of segregation index, show that the contact pattern and mixing of reactants in precipitation process determine the uniformity of Cu‐Zn distribution in initial co‐precipitates at the micro‐scale. The uniform Cu‐Zn distribution is favorable for the formation of zincian malachite with higher Zn fraction, whereas the uneven distribution could lead to either zincian malachite with lower Zn fraction or aurichalcite‐like nonmalachite. These differences in the precursor structure act on subsequent calcination and reduction, as well as their products. Along this path, mixing affects the evolution of the catalyst microstructure by means of Cu‐Zn distribution. © 2018 American Institute of Chemical Engineers AIChE J, 64: 2647–2654, 2018

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“…11,12 The reagents and detail were similar to that in ref. 11,12 The reagents and detail were similar to that in ref.…”

Section: Measurement Of the Segregation Indexmentioning

confidence: 99%

The effect of mixing on Co‐precipitation and evolution of microstructure of Cu‐ZnO catalyst

et al. 2018

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“…In our previous work on the LASP process, experimental evidence was provided to investigate the potential of microfluidic systems for uniform particle size distribution of curcumin nanoparticles. It was concluded that understanding mixing phenomena in the microfluidic device could be further linked to pressure drop, dissipation rate, and size of precipitated nanoparticles under different total flow rates of solvent and anti‐solvent streams …”

Section: Introductionmentioning

confidence: 99%

On the mixing characteristics of a poorly water soluble drug through microfluidic‐assisted nanoprecipitation: Experimental and numerical study

et al. 2017

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Nanoprecipitation of curcumin from its ethanolic solutions was carried out at a microfluidic scale by the liquid anti‐solvent technique, in the presence of SDS as a stabilizer. Attention was mainly paid to the mixing angle of the water and ethanol in three micro‐fabricated channels. The nanosuspension quality was measured by particle size distribution and polydispersity index. BET surface area, dissolution test, FTIR spectra, and XRD patterns of the optimized nanosuspension were also evaluated experimentally. In particular, narrow size distribution of curcumin particles was achieved under well‐controlled conditions of large confluence angles. The amorphous ultrafine curcumin powder exhibited enhanced dissolution properties when compared to the raw material. To explain the precipitation results, a species 3D model was created by computational fluid dynamics (CFD). The pressure drop was compared to the quantitative experimental data to validate the CFD computations. Altogether, the similarities in observations and the mass fraction and velocity predictions of the 3D model revealed that the injection angle of microfluidic devices is a key parameter for the resultant curcumin nanoparticle size.

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“…In passive mixers, mass transfer and mixing in micro fluidic devices is generally driven by molecular diffusion of the laminar flow regime [18,19]. The geometrical structure of the micromixer has a direct influence on the condition of the fluid streams collision and flow distribution [20]. There are some basic designs of the passive micromixer, which split liquid flows into small laminar flow patterns or cause chaotic advection.…”

Section: Introductionmentioning

confidence: 99%

Liquid–liquid two-phase mass transfer in T-type micromixers with different junctions and cylindrical pits

Kakavandi

Rahimi

Jafari

et al. 2016

Chemical Engineering and Processing - Process Intensification

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LASP and Villermaux/Dushman protocols for mixing performance in microchannels: Effect of geometry on micromixing characterization and size reduction

Cited by 29 publications

References 50 publications

The effect of mixing on Co‐precipitation and evolution of microstructure of Cu‐ZnO catalyst

The effect of mixing on Co‐precipitation and evolution of microstructure of Cu‐ZnO catalyst

On the mixing characteristics of a poorly water soluble drug through microfluidic‐assisted nanoprecipitation: Experimental and numerical study

Liquid–liquid two-phase mass transfer in T-type micromixers with different junctions and cylindrical pits

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