Design parameter studies on cyclone type mixers

Kölbl, A.; Kraut, Manfred; Wenka, A.

doi:10.1016/j.cej.2010.08.092

Cited by 25 publications

(17 citation statements)

References 24 publications

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“…Similarly, a cyclone mixer with 16 small area inlets exhibits high mixing efficiency [21]. Kolbl et al concluded that the cyclone mixer with two inlets has better mixing effect than the one with four inlets [22]. Despite the numerous studies on cyclone mixers [21][22][23], the systematic study is hindered by the difficulties of experiments and the lack of accurate simulation technique.…”

Section: Introductionmentioning

confidence: 99%

Rational design of the inlet configuration of flow systems for enhanced mixing

et al. 2021

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High mass transfer rate is a key advantage of microreactors however, under their characteristic laminar flow, it is dominated by slow diffusion rather than fast convection. In this paper, we demonstrate how the configuration of the inlet, i.e. mixers, can promote different flow patterns to greatly enhance mixing efficiency downstream. A systematic evaluation and comparison of different widely adopted mixers as well as advanced designs is presented using a combination of computational fluid dynamics (CFD) and backward particle tracking to accurately calculate diffusion, in the absence of numerical diffusion (false diffusion). In the method, the convection contributed concentration profile is obtained by tracking sampling points from a cross-sectional plane to the inlet point, and diffusion is estimated subsequently. In conventional T- and Y-mixers, the shape of channel, circular or square, is key with only the latter promoting engulfment flow. In cyclone mixers, the resulting average inlet velocity, independent of Reynolds number or geometry, is the dominating design parameter to predict mixing efficiency. This work will serve as a guideline for the design of efficient flow systems with predicted mixing as a way of maximising selectivity and product quality.

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Section: Introductionmentioning

confidence: 99%

Rational design of the inlet configuration of flow systems for enhanced mixing

et al. 2021

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“…For example, Kim et al successfully conducted a protecting‐group‐free organolithium exchange reaction within several milliseconds using integrated T‐shaped micromixers . Due to their attractive characteristics for chemical processes, many micromixers of various types have been developed since the 1990s …”

Section: Introductionmentioning

confidence: 99%

Evaluation of mixing profiles for a new micromixer design strategy

2015

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The relationship between mixing history and reaction performance in microreactors using computational fluid dynamics (CFD) simulations is identified. In the idealized, simplified mixing model, mixing proceeds linearly and only the mixing time determined the reaction performance. However, in the case of realistic models where mixing proceeds unequally, the partial rapid progression of mixing, more than the mixing time, significantly impacts the reaction. The use of the fluid segment size distribution to capture this effect is proposed. The effective Damköhler number derived from the fluid segment size distribution predicted the reaction yield well. To demonstrate the utility of the mixing profile design strategy, we fabricated a novel micromixer with multiple partial rapid mixing zones. This micromixer achieved excellent results both in a CFD simulation and an experiment. © 2015 American Institute of Chemical Engineers AIChE J, 62: 1154–1161, 2016

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“…This multiple-time-scale model was successfully applied previously to simulate small scale mixing [25,26]. In particular, for vortex mixers, Lindenberg et al [10] and Kölbl et al [12] showed the good prediction obtained by the TMM model compared to the experimental results. Thus the TMM model is perfectly suitable to simulate mixing and predict a mixing time for Hartridge Roughton mixers.…”

Section: Computational Fluid Dynamicsmentioning

confidence: 90%

“…Hartridge Roughton rapid mixers promote the rotation and the stretch of the inlet fluids in the mixing chamber even at low Reynolds number, improving mixing at all scales [9]. Several geometries have been proposed in previous works for Hartridge Roughton mixers, one of them with a sharp narrowing [10][11][12][13]. To our knowledge, their mixing performances have never been compared.…”

Section: Introductionmentioning

confidence: 99%