Evaluating the mixing performance of a ribbon blender

Muzzio, Fernando J.; Llusa, Marcos; Goodridge, Christopher L.; Duong, Nhat-Hang; Shen, Elizabeth

doi:10.1016/j.powtec.2007.12.013

Cited by 59 publications

(33 citation statements)

References 15 publications

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“…It is reported that a high impeller speed can have a negative effect on the mixture uniformity [2]. A similar trend with blade speed has been observed also for mixing freeflowing particles in a cylindrical mixer [3].…”

Section: Introductionsupporting

confidence: 73%

“…A similar trend with blade speed has been observed also for mixing freeflowing particles in a cylindrical mixer [3]. A low speed will reduce shear stresses on particles, and may result in a poor homogeneity for cohesive mixtures [2]. A shaft speed in the range of 50-70rpm appears to be a favorable speed for obtaining uniform mixing [4].…”

Section: Introductionsupporting

confidence: 60%

“…Ribbon mixers are considered to be suitable for mixing dry powders as well as free-flowing granular material [1]. It is also reported that a ribbon mixer can produce an improved homogeneity in powder mixing because of large shear stresses in the mixer as well as that it can handle mixing of different size particles [2]. Therefore, a ribbon mixer with a horizontal shaft will be the focus of study here.…”

Section: Introductionmentioning

confidence: 99%

“…Research on a complicated batch mixer such as the ribbon mixer is few [2] and the relationship of mixture quality to inter-particle forces and impeller speed has not been clearly established. The objectivity of this study is thus, to investigate the effect of the impeller speed on the mixing behaviours of cohesive as well as non-cohesive particles in a horizontally-shafted ribbon mixer, by using simulations based on the discreteelement-method (DEM) [5].…”

Section: Introductionmentioning

confidence: 99%

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Mixing behaviour of cohesive and non-cohesive particle mixtures in a ribbon mixer

Musha

Dong

Chandratilleke

et al. 2013

AIP Conference Proceedings

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Abstract. Ribbon mixers are used in a wide range of applications involving pharmaceuticals, ceramics and cosmetics, to name a few. Here, the discrete element method is used to investigate the effect of impeller speed on the mixing behaviours of cohesive as well as non-cohesive particle mixtures in a ribbon mixer, which has a horizontal cylindrical vessel. The mixing behaviours are characterized by particle-scale and macroscopic mixing indexes. Simulations show that the mixing rate increases with the impeller speed for both the cohesive and non-cohesive mixtures up to a certain speed, beyond which it showed a reduction. There is a possibility that the mixture quality becomes poorer at higher impeller speeds for the non-cohesive particles, but it was not the case with the cohesive particles. Inspection of velocity fields shows that many local recirculation regions exist in the case of non-cohesive particle mixing, preventing the overall mixing. By contrast, in the case of the cohesive mixture, there exists a circumferential motion about the shaft and a convective motion in the horizontal axial direction, improving the particle mixing. Force analyses are also carried out, which show that the particle contact forces increase with the impeller speed for non-cohesive particles, but in the case of cohesive particles, they increase initially with the impeller speed, and then show a reduction after a certain speed. The results will be useful in selecting operation conditions of a ribbon mixer.

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Section: Introductionsupporting

confidence: 73%

Section: Introductionsupporting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Mixing behaviour of cohesive and non-cohesive particle mixtures in a ribbon mixer

Musha

Dong

Chandratilleke

et al. 2013

AIP Conference Proceedings

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“…These methods likewise are suitable only for laboratory mixers with limited capacity. Optical measurement methods with fiber optic waveguides and CCD-cameras were used in Stalder (1993), Metcalfe et al (1995), Wightman et al (1996), Khakhar et al (1997), Muzzio et al (1997), Eichler (1998), Puyvelde et al (1999), Aoun-Habbache et al (2002), Realpe et al (2003), Ålander et al (2003), Landwehr (2005), Berthiaux et al (2006) and Muzzio et al (2008). Here, image analysis was in all cases used for the purpose of characterizing the mixing state.…”

Section: Introductionmentioning

confidence: 99%

Determination of the mixing time in a discontinuous powder mixer by using image analysis

Daumann

Fath

Anlauf

et al. 2009

Chemical Engineering Science

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This study reports on research results in the field of powder mixing in a discontinuously operated charge mixer. The mixing time for a confidence interval can be determined from the mixing efficiency that characterizes the mixing of the participating solid components as a function of the mixing time. The mixing efficiency is determined here with the help of an image analysis method developed for these purposes. The particle fraction, that is interesting in terms of its distribution, is partially replaced for this purpose by a similarly behaving but optically well identifiable tracer material. A dispersion coefficient can be obtained from the analysis of the mixing trial. The practical application of statistics on image analysis is described and discussed along with a description of the possibilities and limitations of the measurement method. The description of the procedure to determine the dispersion coefficient is built on that.

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Dairy Ingredients in Dairy Food Processing

Schoenfuss

Chandan

2011

Dairy Ingredients for Food Processing

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Evaluating the mixing performance of a ribbon blender

Cited by 59 publications

References 15 publications

Mixing behaviour of cohesive and non-cohesive particle mixtures in a ribbon mixer

Mixing behaviour of cohesive and non-cohesive particle mixtures in a ribbon mixer

Determination of the mixing time in a discontinuous powder mixer by using image analysis

Dairy Ingredients in Dairy Food Processing

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