Microdynamic analysis of the particle flow in a cylindrical bladed mixer

Zhou, Yu; Yu, Aibing; Stewart, Robert L.; Bridgwater, J.

doi:10.1016/j.ces.2003.12.023

Cited by 128 publications

(124 citation statements)

References 42 publications

Supporting

Mentioning

117

Contrasting

Order By: Relevance

“…However, this laser module still has the following ad- meet Reynolds number and, ultimately, dynamic similitude requirements to ensure that the model and the testing conditions have the same dimensionless parameters. Typical particle flow visualization is carried out in a confining container; thus, particle-wall interaction could alter the micro-dynamic of the particle flow near the walls [11] [12] [13]. The wall factor which depends on the ratio Figure 5.…”

Section: Discussionmentioning

confidence: 99%

Flow Visualization and Modeling for Education and Research in Sedimentary Processes: An Accessible and Inexpensive Alternative

Motanated¹

2017

GEP

View full text Add to dashboard Cite

Sedimentary processes have direct effects on the geometry, distribution, and geophysical and geochemical properties of sedimentary rocks. Being able to qualitatively and quantitatively visualize the movement vector of sediments in fluid media is essential for understanding the complicated earth surface processes. Nonintrusive measuring and observing the interaction between the movement of fluid media and particles by a laser sheet flow visualization technique requires a light source that is thin and monochromatic. Yet, an ideal laser sheet generator is rather expensive and inaccessible, especially for schools and universities residing in low-income countries. This project is proposing a less-expensive option for a laser sheet source for nonintrusive flow visualization and modeling. Here, cylindrical lens is used to convert from point laser into sheet laser. Multiple combinations of laser diodes of various wavelength (nanometer) and power (milliwatt) and cylindrical lenses of various dimensions are analyzed. The pair that is able to produce the thinnest and brightest light sheet is not only effective but also affordable. The combination of manufactured laser module of 532 nm 50 mW and a single rod lens is able to generate a light sheet that is less than 4 mm thick. When choosing a laser module, this research recommends one at a wavelength of 532 nm with any electric power (high wattage results in high lumens).

show abstract

Section: Discussionmentioning

confidence: 99%

Flow Visualization and Modeling for Education and Research in Sedimentary Processes: An Accessible and Inexpensive Alternative

Motanated¹

2017

GEP

View full text Add to dashboard Cite

show abstract

“…The DEM model used here is essentially the same as that previously developed and validated by Zhou et al [6,7]. The geometry of the impeller of the ribbon mixer used is shown in Fig.1 Simulations are conducted for the cases of cohesive and non-cohesive particles.…”

Section: Simulation Methods and Conditionsmentioning

confidence: 99%

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

Musha

Dong

Chandratilleke

et al. 2013

AIP Conference Proceedings

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…The DEM model used here is based on one previously developed [5,6], and is an extension of the original DEM model [7] to account for the rolling friction of particles. The model has been validated and its details can be found elsewhere [6].…”

Section: Simulation Methodsmentioning

confidence: 99%

Effects of size and density differences on mixing of binary mixtures of particles

Musha

Chandratilleke

Chan

et al. 2013

AIP Conference Proceedings

Self Cite

View full text Add to dashboard Cite

Abstract. Mixing of granular materials is an important operation in many industries such as the pharmaceutical industry. Generally, a granular material to be mixed can have particles of different densities and sizes, which makes the mixing difficult. Several studies have addressed the issue of finding the optimum combinations of the size and density ratios of binary particles for mixing to happen, using rotating drums as the mixers. For mixtures of particles uniform in either the size or density, we have shown previously that mixing index of the mixtures can be represented by a unique function of the variable, 3 where β (<1) and γ (<1) are the size and density ratios respectively. This concept was demonstrated for a volume fraction, α = 0.5 of the large (or denser) particles, using a vertically shafted cylindrical mixer. The implication of this result is that the size effects can be represented by an equivalent density difference. Here, this concept is further investigated for mixing of binary particles having different combinations of β and γ, at different values of α. It is shown that the variation of the mixing index can be expressed as a function of the three variables, β, γ and α. Such a relationship will be useful in predicting the outcomes of mixing of binary particles.

show abstract

Microdynamic analysis of the particle flow in a cylindrical bladed mixer

Cited by 128 publications

References 42 publications

Flow Visualization and Modeling for Education and Research in Sedimentary Processes: An Accessible and Inexpensive Alternative

Flow Visualization and Modeling for Education and Research in Sedimentary Processes: An Accessible and Inexpensive Alternative

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

Effects of size and density differences on mixing of binary mixtures of particles

Contact Info

Product

Resources

About