Mixing Enhancement of Newtonian Liquids in a Curvature Induced Split and Recombine Micromixer

Abstract

The influence of a curvature induced flow path in the form of a split and recombine microchannel is studied and compared with the output of a straight type micromixer. The mixing efficiency of ethanol into water is analyzed for diffusion dominated flows. Apart from parametric variations, the Dean flow analysis at different locations of the channels showed higher capability of the curvature induced geometries. The aspect of layer mixing is also examined by the strength of the expansion or contraction along the flow path, which signifies the effect of curvature upon the extent of mixing. Mixing efficiency as high as 94% has been achieved for the elliptical type of micromixer. Additionally, the influence of curvature toward the gradual increase and enhancement of mixing has been demonstrated with the gradual increase of the area of contact available in the split and recombine sections.

Intensification of silver nanoparticle synthesis through continuous flow split and recombine microreactors

“…The validation study of ethanol-water mixing can be referred from the results reported by Ghosh and Atta. 55 That numerical model was applied to obtain Ag NP size distribution along a helical microreactor, to compare with the experimental results as reported by Wu et al 43 A maximum variation of around 13% was observed (Fig. 3b), indicating good model benchmarking.…”

“…A qualitative presentation of the concentration profiles depicting the extent of mixing in the different microreactors can be referred from a previously published article by Ghosh and Atta. 55 An improved extent of mixing is observed for the microreactors with split and recombine sections due to the factor of variable flow area, which helps in more effective contact of the precursor streams. In the straight-type microreactor, the liquids flow in a manner where the diffusion is marginal only across the interface between the two streams and limits further diffusion of the transferred component into the bulk of the phase.…”

“…The details of the numerical methodology for the process of multiphase flow can be referred from the previously published article by Ghosh and Atta, 55 where the method uses the equations that control how the liquids under investigation come into contact with one another and how desired species are transferred through the interface. The same methodology has been incorporated to study the dynamics of mixing of AgNO 3 and NaBH 4 and extended to the mechanism of the reactions between them.…”

“…Further details on channel dimensions can be found in our previous work. 55 The straight-type microreactor has a linear flow length of 10.51 mm from the merging junction till the exit (Fig. 1a).…”

A Novel Strategy for Square-Wave Micromixers: A Survey of RBC Lysis for Further Biological Analysis

“…Microfluidics, also known as lab-on-a-chip, is the science studying the flow behavior at the microscale. , Flow manipulation within microfluidic devices such as micromixers, − microdroplet generators, − and microseparators − is pursued to achieve the desired output. These systems have found their functionality in various biorelated analyses and engineering. − In many of these applications, efficient and well-controlled mixing is crucial in successfully satisfying the aim of the desired study. , Therefore, micromixers are one of the most pivotal parts of lab-on-a-chip systems.…”