Maximizing mixing and alignment of orientable particles for reaction enhancement

A sandwich mixer consists of mixing two solutions in a channel, one central laminar flow being sandwiched between two outer flow solutions. The present numerical study considers the convectiondiffusion of two reacting species A and B, provided respectively by the two incoming solutions. The simulations show how the diffusion coefficient, flow rate and species concentration ratios influence, via the transversal diffusion length and reaction kinetics, the reaction extent at the end of the sandwich mixer. First, this extent can be enhanced up to 60% if the species with the lowest diffusion coefficient is located in the outer solutions where the flow velocity is small compared to that of the central part (higher residence time). Secondly, decreasing the outer flow rates (to confine the reaction close to the walls) and increasing the local concentration to keep the same flux ratio improve the extent by 300%.Comparison with a bi-lamination passive mixer, with an ideal mixer and an electro-osmotic driven flow mixer is presented. These conclusions are also demonstrated for consecutive reactions, showing an amplification of the effects described above. The results are also presented versus the residence time in the mixer-reactor to show the time window for which the gain is appreciable.

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“…The transversal Reynolds (Re), Péclet (Pe) and second Damkö ler numbers (Da) [38][39][40][41][42] are defined as following:…”

Section: Numerical Model and Assumptionsmentioning

confidence: 99%

Sandwich mixer–reactor: influence of the diffusion coefficient and flow rate ratios

Abonnenc

Josserand

2009

Lab Chip

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“…Reaction-diffusion processes in a stirred fluid arise in a wide variety of chemical [1][2][3][4][5][6][7][8][9] and biological [10][11][12] contexts. In this paper, we consider a bistable chemical reaction taking place in a chaotically stirred fluid.…”

Section: Introductionmentioning

confidence: 99%

Shear-flow suppression of hotspot growth

Finn

Cox

2011

Physica D: Nonlinear Phenomena

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“…Nowadays, the investigation of micro/nano scale technology is well under way, showing a forefront research direction with significant prospects [12][13][14][15][16][17][18][19][20][21]. Although wholly absorbed in the physico-chemical properties and in micro/nano phenomena, the energy supply and conversion issue in such scales have also been introduced in research laboratories worldwide [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Micro/nanofluidics-enabled energy conversion and its implemented devices

Yang

Liu

2010

Front. Energy Power Eng. China

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Most people were not aware of the role of energy as a basic force that drives the development and economic growth of the world until the two great oil crises occurred. According to the conservation law, energy not only exists in various forms but is also capable of being converted from one form to another. The common forms of energy are mechanical energy, chemical energy, internal energy, electrical energy, atomic energy, and electromagnetic energy, among others. The fluids in nature serve as the most common carriers and media in the energy conversion process. Following the rapid development of microelectromechanical systems (MEMS) technology, the energy supply and conversion issue in micro/nano scale has also been introduced in research laboratories worldwide. With unremitting efforts, great quantities of micro/ nano scale energy devices have been investigated. Micro/ nanofluid shows distinct features in transporting and converting energy similar to their counterpart macroscale tasks. In this paper, a series of micro/nanofluid-enabled energy conversion devices is reviewed based on the transformation between different forms of energy. The evaluation and contradistinction of their performances are also examined. The role of micro/nanofluid as media in micro/nano energy devices is summarized. This contributes to the establishment of a comprehensive and systematic structure in the relationship between energy conversion and fluid in the micro/nano scale. Some fundamental and practical issues are outlined, and the prospects in this challenging area are explored.

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Maximizing mixing and alignment of orientable particles for reaction enhancement

Cited by 15 publications

References 66 publications

Sandwich mixer–reactor: influence of the diffusion coefficient and flow rate ratios

Sandwich mixer–reactor: influence of the diffusion coefficient and flow rate ratios

Shear-flow suppression of hotspot growth

Micro/nanofluidics-enabled energy conversion and its implemented devices

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