Hydrodynamics and mixing performance of Hartridge Roughton mixers: Influence of the mixing chamber design

Patrizio, Nicolas Di; Bagnaro, M.; Gaunand, Alain; Hochepied, Jean-François; Horbez, Dominique; Pitiot, Pascal

doi:10.1016/j.cej.2015.06.116

Cited by 13 publications

(5 citation statements)

References 28 publications

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“…Such rotating or vortex flows enable millisecond mixing, even for Reynolds numbers smaller than what is expected for the onset of turbulence. However, we must stress that the definition of a Reynolds number in a tangential mixer is not straightforward [33], which stems from the complex rotating flow pattern, and should be only interpreted qualitatively [21]. Still, it is a useful tool to compare different flow rate conditions and geometries.…”

Section: Uncoupling Mixing and Reaction With Multi-inlet Vortex Mixersmentioning

confidence: 99%

“…Indeed, for syntheses involve the mixing of several fluids, a coupling between mixing and precipitation occurs if mixing times are larger than reaction times [17,7]. Rapid mixers are thus needed to suppress this coupling by decreasing mixing times [18][19][20][21][22]. A diversity of rapid mixers exist depending on the flow regimes, for instance creeping, laminar or turbulent, with the same aim to achieve a homogeneous mixture prior to the reaction.…”

Section: Introductionmentioning

confidence: 99%

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Controlling nanoparticle formation from the onset of nucleation through a multi-step continuous flow approach

Roger

Amri

2022

Journal of Colloid and Interface Science

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Section: Uncoupling Mixing and Reaction With Multi-inlet Vortex Mixersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Controlling nanoparticle formation from the onset of nucleation through a multi-step continuous flow approach

Roger

Amri

2022

Journal of Colloid and Interface Science

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“…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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“…A Hartridge–Roughton mixer was designed and optimized for heat transfer using lattices to increase surface area. Hartridge–Roughton mixers are known to operate well in low and intermediate Reynolds numbers. − A good mixer in the low Reynolds region is ideal for this application because the reaction is fast, and the rate of heat generation should be controlled by dosing the right amount of products. Otherwise, if the inlet flow of reactants is too high, it will be difficult to keep a good heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Production of Customized Reactors by 3D Printing for Corrosive and Exothermic Reactions

Grande

Didriksen

2021

Ind. Eng. Chem. Res.

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This work presents a continuous reactor designed to be produced by 3D printing with the ultimate objective of performing fast, exothermic, and corrosive reactions. The dilution of sulfuric acid with water was used as a model for reactor design. A good mixing inside the reactor will promote the dilution and at the same time increase the heat transfer. Fast heat transfer is important to avoid vaporization of reactants/products and to control corrosion inside the reactor. The reactor was designed using a genetic algorithm to maximize the surface area of a prespecified reactor volume while ensuring a good mixing of the reactants. We have experimentally demonstrated that dilution of sulfuric acid can be done continuously in a Hartridge–Roughton mixer with lattices for enhanced heat transfer. Selected designs with internal and external lattices for enhanced heat exchange were manufactured by 3D printing using the Ti64 alloy. Different printing services were used to compare the quality of reactors that can be achieved by new industrial players that do not possess a 3D printer. One important item that should be considered when 3D printing is used for corrosive reactions is cross-contamination with other metals, since that can significantly affect the life and safety conditions of the reactors.

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Hydrodynamics and mixing performance of Hartridge Roughton mixers: Influence of the mixing chamber design

Cited by 13 publications

References 28 publications

Controlling nanoparticle formation from the onset of nucleation through a multi-step continuous flow approach

Controlling nanoparticle formation from the onset of nucleation through a multi-step continuous flow approach

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

Production of Customized Reactors by 3D Printing for Corrosive and Exothermic Reactions

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