Hydrodynamics Performance of a Dual Shaft Mixer with Viscous Newtonian Liquids

Cabaret, F.; Rivera, Christian; Fradette, Louis; Heniche, Mourad; Tanguy, Philippe A.

doi:10.1205/cherd06175

Cited by 27 publications

(11 citation statements)

References 18 publications

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“…Arratia et al, 20 Bonnot et al, 4 and Cabaret et al 21,22 used a digital camera for recording in the course of the experiment and obtained the curve of mixing time t by extracting G values from RGB images before and after uniform mixing. A similar method was used to extract RGB images in the video before and after uniform mixing, the mean value of R in each RGB image was calculated, and thereby the curve of corn syrup concentration M changing with time t was obtained.…”

Section: Mixing Experimentsmentioning

confidence: 99%

Study on double-shaft mixing paddle undergoing planetary motion in the laminar flow mixing system

Zhang

et al. 2015

Advances in Mechanical Engineering

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This article has studied the impact of double-shaft mixing paddle undergoing planetary motion on laminar flow mixing system using flow field visualization experiment and computational fluid dynamics simulation. Digital image processing was conducted to analyze the mixing efficiency of mixing paddle in co-rotating and counter-rotating modes. It was found that the double-shaft mixing paddle undergoing planetary motion would not produce the isolated mixing regions in the laminar flow mixing system, and its mixing efficiency in counter-rotating modes was higher than that in co-rotating modes, especially at low rotating speed. According to the tracer trajectory experiment, it was found that the path line of the tracer in the flow field in co-rotating modes was distributed in the opposite direction to the path line in counterrotating modes. Planetary motion of mixing paddle had stretching, shearing, and folding effects on the trajectory of the tracer. By means of computational fluid dynamics simulation, it was found that axial flows and tangential flows produced in co-rotating and counter-rotating modes have similar flow velocity but opposite flow directions. It is deduced from the distribution rule of axial flow, radial flow, and tangential flow in the flow field that axial flow is the main reason for causing different mixing efficiencies between co-rotating and counter-rotating modes.

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Section: Mixing Experimentsmentioning

confidence: 99%

Study on double-shaft mixing paddle undergoing planetary motion in the laminar flow mixing system

Zhang

et al. 2015

Advances in Mechanical Engineering

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“…In order to enhance mixing under laminar condition, many works have been reported about the advantage of utilizing unsteady impeller motion. − Yao et al adopted two unsteady stirring approaches, coreverse periodic rotation and time-periodic variation of rotational speed, to enhance global mixing in a stirred tank with highly viscous fluid. Nomura et al also revealed that coreverse rotation of the impeller prevented the formation of a segregated mixing region and reduced mixing time.…”

Section: Introductionmentioning

confidence: 99%

“…With two off-centered impellers in stirred tanks using inelastic shear-thinning fluids, Ascanio et al 19 found no segregated regions were formed and better homogenization was achieved. Especially, the dual shaft mixing system with the counter-rotating mode 20 talization, break the segregated regions and reduce the mixing time. For spatial terms, its disadvantages are poor stability of equipment, low flexibility of operation and low reliability.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Micromixing of Non-Newtonian Fluids by a Novel Zigzag Punched Impeller

Yang

Zhang

Mao

et al. 2019

Ind. Eng. Chem. Res.

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In this work, a novel impeller with zigzag punched blades is developed to produce impinging jet streams from face-to-face holes to enhance mixing in a 0.282 m diameter baffled stirred tank. The micromixing experiments on non-Newtonian fluids are conducted to compare among standard six straight blade turbine (DT), down-pumping pitched blade turbine (PBTD-45°) and our novel zigzag punched impeller (ZPI). Results show that at low Reynolds numbers (700 < Re < 3000), the segregation index of ZPI is the lowest. It shows that the ZPI exhibits higher micromixing performance than other two traditional ones. Moreover, the effect of geometric parameters of blade like holes size, single section length of paddle and the zigzag angle of the novel zigzag impeller on micromixing are also investigated. It is found that the ZPI with larger zigzag angle, shorter single section length and smaller holes leads to significant improvement on micromixing efficiency.

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“…These resulting power correlations were shown to be applicable for the coaxial mixer combining an anchor and either a radial impeller (Rushton turbine) or an axial impeller (Mixel TT). With respect to other types of multishaft mixers, several innovative studies have been carried out based on, for instance, dual shaft configurations − or Superblend mixers. − The design and the optimization of multishaft mixers are at present mainly based on empirical knowledge mostly because the specific investigations on such mixers are fairly new but also due to the controversy about what should be used as their characteristic parameters, owing to their inherent hydrodynamic complexity.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Power Consumption in Multishaft Mixers

Wang

Farhat

Fradette

et al. 2014

Ind. Eng. Chem. Res.

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New definitions of the Reynolds and power numbers proposed by Farhat, Fradette, and Tanguy (2008) for coaxial mixers were discussed and extended to some other types of multishaft mixers not considered previously. The results confirmed that these new correlations are also applicable for the dual shaft mixer configurations and the Superblend mixer. This universal applicability allowed the authors to experimentally investigate and compare the power consumption and the mixing time in the coaxial, the dual shaft, and the Superblend mixers based on uniform criteria. It was found that the Mixel TT−Anchor combination is the most power-efficient combination, whereas the Superblend mixer requires the most power. Besides, a general approach was introduced to predict the power constant of these multishaft mixers. Finally, the limitations of the new correlations were pointed out through the extension study of their applicability in Superblend and Rotor Stator−Paravisc dual shaft mixer.

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Hydrodynamics Performance of a Dual Shaft Mixer with Viscous Newtonian Liquids

Cited by 27 publications

References 18 publications

Study on double-shaft mixing paddle undergoing planetary motion in the laminar flow mixing system

Study on double-shaft mixing paddle undergoing planetary motion in the laminar flow mixing system

Enhanced Micromixing of Non-Newtonian Fluids by a Novel Zigzag Punched Impeller

Analysis of Power Consumption in Multishaft Mixers

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