Experimental investigation of the flow dynamics of rheologically complex fluids in a Maxblend impeller system using PIV

Fontaine, André; Guntzburger, Yoann; Bertrand, François; Fradette, Louis; Heuzey, Marie‐Claude

doi:10.1016/j.cherd.2012.06.018

Cited by 26 publications

(32 citation statements)

References 18 publications

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“…The Maxblend TM is one of such impellers; it was originally developed for mixing highly viscous fluids during chemical reactions (Hiruta et al, 1997) and it has been used in a wide range of industries, from production of PVC, biopolymers and biocellulose to surfactants across different scales (20-2500L) (Sumitomo, 2017). Fontaine et al (2013) studied experimentally the effect of rheology on the fluid dynamics in a vessel with a Maxblend TM impeller using PIV and the decolorization technique for both Newtonian and non-Newtonian fluids (highly shear thinning and viscoelastic). Their results indicated that the performance of the impeller for highly shear thinning fluids is significantly worse compared to that achieved for highly viscous Newtonian fluids.…”

Section: Introductionmentioning

confidence: 99%

Computational fluid dynamic studies of mixers for highly viscous shear thinning fluids and PIV validation

Cortada-García

Weheliye

Dore

et al. 2018

Chemical Engineering Science

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Often, impellers almost as large as the tanks containing them and impeller blades equipped with holes are adopted in industry. In this work, we studied experimentally the main features of the flow generated by this type of impellers for a mixture of glycerol with a carbomeric gel by means of particle image velocimetry. The experiments were conducted at temperatures ranging from 40 to 60°C and impeller speeds ranging from 40 to 140 rpm. In all cases, the flow regime was laminar or in the transition region. We also used computational fluid dynamics simulations to describe the behaviour of the mixer, validating the results experimentally with good agreement. We used the numerical results to obtain information on the performance of the mixer, determining the locations and size of vigorous agitation zones and the local effect of the holes present on the impeller blades. The power curves of the mixer were obtained, and the mixer efficiency in terms of power consumption was found to be similar to other impellers used to mix highly viscous non-Newtonian fluids.

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Section: Introductionmentioning

confidence: 99%

Computational fluid dynamic studies of mixers for highly viscous shear thinning fluids and PIV validation

Cortada-García

Weheliye

Dore

et al. 2018

Chemical Engineering Science

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“…The article [3]demonstrated the consistency between the drag reduction behavior and the viscoelastic behavior of polymer solutions and the relationship between viscoelasticity and concentration through viscosity measurements. It was worth noted that CMC solution was not only shear-thinning but also was elastic [4]. In recent years, the mechanism of drag reduction was explained by monitoring the velocity distribution using UDV [5].…”

Section: Introductionmentioning

confidence: 99%

The drag reduction effects of a non-Newtonian fluid (CMC aqueous solution) in a sinusoidal wavy-walled tube at moderate Reynolds numbers for steady flow

Bian¹,

Li²,

Ren³

2015

Proceedings of the 3rd International Conference on Material, Mechanical and Manufacturing Engineering

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Abstract. The drag reduction effects of a non-Newtonian fluid (CMC aqueous solution with 50-1000wppm) in a sinusoidal wavy-walled tube were investigated experimentally in the Reynolds numbers range from 25 to 360. Based on the pressure drop method, drag reduction was measured and the maximum drag reduction achieved was 38% using 700wppm. It was found that in the end of the laminar flow region the CMC polymer solutions display more distinct drag reduction than that in turbulent flow region. Besides, the effect of rheological parameters on drag reduction has been discussed.

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“…Owing to such works, the performance of the Maxblend is well documented, thus confirming the advantages and drawbacks of the impeller. In particular, it has been established that the homogeneity of the mixture is harder to obtain at low Reynolds number, the understanding of the mixing mechanisms in the deep laminar regime being still limited.…”

Section: Introductionmentioning

confidence: 99%

“…From an experimental standpoint, the determination of the pumping capacity is complex due to the difficulty in measuring the flow field. However, two promising approaches, based on two‐dimensional particle image velocimetry (PIV) and the so‐called decolourisation method, have recently been utilised . With the 2D PIV, the flow is obtained through a statistical analysis of successive pictures representing the positions of particles in the system.…”

Section: Introductionmentioning

confidence: 99%

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Pumping characterisation of the maxblend impeller for Newtonian and strongly non‐Newtonian fluids

et al. 2013

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This paper examines the pumping mechanisms generated by the Maxblend impeller. Simulation results obtained with the lattice Boltzmann method (LBM) are presented for Newtonian fluids (Re = 2–140) and strongly shear‐thinning fluids (Reg = 0.1–50) obeying the Carreau–Yasuda model with a very small power index (n = 0.05). In the Newtonian case, the pumping numbers predicted by the LBM are shown to compare favourably to those obtained with the finite element (FEM) as well as to experimental data based on the decolourisation method. These results indicate a small pumping capacity in the deep laminar regime followed by its sharp increase in the transitional regime, a phenomenon which is explained by examining the flow field simulated with the LBM and the FEM and measured through PIV. In the case of the strongly shear thinning fluids, the impact of the rheology on pumping is investigated. The flow fields and so‐called pumping volumes predicted with the LBM reveal, similarly to the Newtonian case, a change in the structure of the axial and (secondary) radial flow when the Reynolds number is increased. Viscosity contours suggest that this phenomenon is in fact related to the occurrence of zones with very different apparent viscosities, which explains the problematic flow patterns observed experimentally with the PIV.

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Experimental investigation of the flow dynamics of rheologically complex fluids in a Maxblend impeller system using PIV

Cited by 26 publications

References 18 publications

Computational fluid dynamic studies of mixers for highly viscous shear thinning fluids and PIV validation

Computational fluid dynamic studies of mixers for highly viscous shear thinning fluids and PIV validation

The drag reduction effects of a non-Newtonian fluid (CMC aqueous solution) in a sinusoidal wavy-walled tube at moderate Reynolds numbers for steady flow

Pumping characterisation of the maxblend impeller for Newtonian and strongly non‐Newtonian fluids

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