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1. Hierarchical copulas with Archimedean blocks and asymmetric between-block pairs

Author:
Chaoubi, Ihsan; Cossette, Hélène; Marceau, Etienne; Robert, Christian Y.
Source:
Computational statistics & data analysis 2021 v.154 pp. 107071
ISSN:
0167-9473
Subject:
mixing,   etc   ; data analysis; data collection; estimation; trees;     Show all 5 Subjects
Abstract:
... A new class of hierarchical copulas is introduced based on joint survival functions of multivariate exponential mixture distributions. The key element of this construction is the mixing random vector defined by convolutions associated to a Lévy subordinator, and leading to hierarchical copulas with Archimedean within-block copulas and asymmetric between-block pair-copulas. For the specific case of ...
DOI:
10.1016/j.csda.2020.107071

2. Improving the effectiveness of the Comil as a dry-coating process: Enabling direct compaction for high drug loading formulations

Author:
Capece, Maxx; Borchardt, Christian; Jayaraman, Arun
Source:
Powder technology 2021 v.379 pp. 617-629
ISSN:
0032-5910
Subject:
mixing,   etc   ; area; drugs; models; pH; powders; technology;     Show all 7 Subjects
Abstract:
... This study investigated the Comil as a dry-coating process to enhance the flowability of pharmaceutical powders. As a major novelty, the mean residence time was measured and the effect of processing conditions on the extent of flowability enhancement was evaluated. As opposed to previous work which used a “multi-pass” approach to increase residence time and to improve the effectiveness of the Comi ...
DOI:
10.1016/j.powtec.2020.10.070

3. Discrete finite volume approach for multidimensional agglomeration population balance equation on unstructured grid

Author:
Singh, Mehakpreet; Singh, Randhir; Singh, Sukhjit; Walker, Gavin; Matsoukas, Themis
Source:
Powder technology 2020 v.376 pp. 229-240
ISSN:
0032-5910
Subject:
mixing,   etc   ; equations; solutes; variance;     Show all 4 Subjects
Abstract:
... In this work, a discrete finite volume scheme (FVS) is developed for approximating a multidimensional agglomeration population balance equation on an unstructured grid. Previous applications of the FVS were restricted only to structured rectangular and triangular grids. The main hindrance of using the unstructured grid is less knowledge of the relation between the quality of solution and the natur ...
DOI:
10.1016/j.powtec.2020.08.022

4. A review of existing mixing indices in solid-based continuous blending operations

Author:
Bhalode, Pooja; Ierapetritou, Marianthi
Source:
Powder technology 2020 v.373 pp. 195-209
ISSN:
0032-5910
Subject:
mixing,   etc   ; drugs; manufacturing; solids;     Show all 4 Subjects
Abstract:
... Blend uniformity is a critical quality attribute in continuous pharmaceutical manufacturing. However, its measurement is challenging due to the difficulty and inaccessibility of sampling locations in a continuous blender. Though computational approaches like Discrete Element Method (DEM) can address this, one of the underlying challenges is the appropriate selection of mixing index for measurement ...
DOI:
10.1016/j.powtec.2020.06.043

5. Discharge of granular materials in a hemispherical bottom silo under vertical vibration

Author:
Du, Jianping; Liu, Chuanping; Wang, Chengcheng; Wu, Ping; Ding, Yulong; Wang, Li
Source:
Powder technology 2020 v.372 pp. 128-135
ISSN:
0032-5910
Subject:
mixing,   etc   ; silos; vibration;     Show all 3 Subjects
Abstract:
... The discharge of granular materials from a silo subject to vertical vibration was studied in cylindrical silos. A hemispherical bottom silo with five different angles of outlets was proposed. The effects of the stirring shaft angular velocity, the dimensionless depth of granular materials, and the discharge exit angle on the discharge in the silo were compared. An enhancement factor was proposed t ...
DOI:
10.1016/j.powtec.2020.06.006

6. Reactive crystallization: From mixing to control of kinetics by additives

Author:
Rodriguez-Ruiz, Isaac; Teychené, Sébastien; Rodríguez-Ruiz, Isaac; Ramamoorthy, Raj Kumar
Source:
Current opinion in colloid & interface science 2020 v.46 pp. 1-19
ISSN:
1359-0294
Subject:
mixing,   etc   ; additives; crystallization;     Show all 3 Subjects
Abstract:
... The study of the mechanisms lying underneath reactive crystallization is a key subject in a myriad of natural and industrial processes. Here, control on particle nucleation and growth are active topics of research, in which important advances can be highlighted within the last years. Although novel mechanisms for crystal nucleation have been recently unveiled, the effects of reagent mixing process ...
DOI:
10.1016/j.cocis.2020.01.003

7. Experimental study and DEM analysis of granular segregation in a rotating drum

Author:
Brandao, Rodolfo J.; Lima, Rondinelli M.; Santos, Raphael L.; Duarte, Claudio R.; Barrozo, Marcos A.S.
Source:
Powder technology 2020 v.364 pp. 1-12
ISSN:
0032-5910
Subject:
mixing,   etc   ; calibration; drums (equipment);     Show all 3 Subjects
Abstract:
... In this work, we experimentally and numerically investigated the mixing/segregation behavior of particles in an unbaffled rotary drum. We analyzed different combinations of binary mixtures that varied in density and size. We also quantified the effect of filling degree and rotational speed of the drum on the mixing index of each binary mixture. We used the discrete element method (DEM) for the sim ...
DOI:
10.1016/j.powtec.2020.01.036

8. Effect of bend angle on granular size segregation in the chute flow under periodic flow inversion

Author:
Mantravadi, Bhargav; Tan, Danielle S.
Source:
Powder technology 2020 v.360 pp. 177-192
ISSN:
0032-5910
Subject:
mixing,   etc   ; chutes; industry; powders;     Show all 4 Subjects
Abstract:
... Segregation of granular homogeneous mixtures is a common problem faced by many industries. In recent years, periodic flow inversions have shown to mitigate both size and density segregation. However, they are not fully explored. In this paper, we investigate the effect of bend angle (θ) in the chute flow using three-dimensional Discrete Element Method (DEM) simulations. We observed a significant d ...
DOI:
10.1016/j.powtec.2019.10.005

9. Study on mixing characteristics in shaken microwell systems

Author:
Li, Yi; Ducci, Andrea; Micheletti, Martina
Source:
Biochemical engineering journal 2020 v.153 pp. 107392
ISSN:
1369-703X
Subject:
mixing,   etc   ; bioprocessing; biotechnology;     Show all 3 Subjects
Abstract:
... Shaken microwell plates are widely used for early bioprocess development as they allow a large number of experiments to be performed in parallel by using small amount of materials. Despite their widespread use, microwell plates have not been characterised from an engineering viewpoint. In this study, mixing time measurements were carried out in two wells of square and cylindrical cross sections fo ...
DOI:
10.1016/j.bej.2019.107392

10. An Overview of Flow Features and Mixing in Micro T and Arrow Mixers

Author:
Camarri, Simone; Mariotti, Alessandro; Galletti, Chiara; Brunazzi, Elisabetta; Mauri, Roberto; Salvetti, Maria Vittoria
Source:
Industrial & engineering chemistry process design and development 2020 v.59 no.9 pp. 3669-3686
ISSN:
1520-5045
Subject:
mixing,   etc   ; Reynolds number; mixers;     Show all 3 Subjects
Abstract:
... An overview of the mixing performances of micro T mixers operating with a single fluid is presented. The focus is on the relationship between the flow features and mixing. Indeed, T mixers are characterized by a variety of regimes for increasing Reynolds numbers; they are briefly described, in particular in terms of the three-dimensional vorticity field, which can explain the different mixing perf ...
DOI:
10.1021/acs.iecr.9b04922

11. MIXANDMIX: numerical techniques for the computation of empirical spectral distributions of population mixtures

Author:
Cordero-Grande, Lucilio
Source:
Computational statistics & data analysis 2020 v.141 pp. 1-11
ISSN:
0167-9473
Subject:
mixing,   etc   ; equations; models;     Show all 3 Subjects
Abstract:
... The MIXANDMIX (mixtures by Anderson mixing) tool for the computation of the empirical spectral distribution of random matrices generated by mixtures of populations is described. Within the population mixture model the mapping between the population distributions and the limiting spectral distribution can be obtained by solving a set of systems of non-linear equations, for which an efficient implem ...
DOI:
10.1016/j.csda.2019.06.011

12. GPU-based DEM simulation for scale-up of bladed mixers

Author:
Herman, Angga Pratama; Gan, Jieqing; Yu, Aibing
Source:
Powder technology 2021 v.382 pp. 300-317
ISSN:
0032-5910
Subject:
mixing,   etc   ; correlation; exhibitions; forces; geometry; mixers; technology; torque; velocity;     Show all 9 Subjects
Abstract:
... GPU-based DEM is used to study large-scale particle mixing in bladed mixers. A bladed mixer is scaled-up to three different sizes by maintaining the geometric similarity. Four Froude numbers are selected as the main operating conditions of bladed mixers with different sizes. The results demonstrated that the mixing quality across different mixer sizes is similar at the same Froude number, but it r ...
DOI:
10.1016/j.powtec.2020.12.045

13. Utilization of glass cullet to enhance the performance of recycled aggregate unbound sub-base

Author:
Chen, Zhen; Poon, Chi Sun; Li, Jiang-Shan; Xue, Qiang
Source:
Journal of cleaner production 2021 v.288 pp. 125083
ISSN:
0959-6526
Subject:
mixing,   etc   ; crushing; glass; laboratories; mass; paper; pavements; water content;     Show all 8 Subjects
Abstract:
... This paper presents the findings of a laboratory investigation on the utilization of recycled glass cullet as fine aggregates to replace the fine-sized demolition aggregates for producing full-depth unbound aggregate sub-bases of pavement. The experimental results indicated that glass cullet was suitable for use as fine aggregates in unbound sub-base. The inclusion of glass cullet in recycled demo ...
DOI:
10.1016/j.jclepro.2020.125083

14. Characterization of intruder particle motion in a bladed mixer

Author:
Nadeem, Humair; Subramaniam, Shankar; Sinha, Kushal; Heindel, Theodore J.
Source:
Powder technology 2021 v.381 pp. 440-450
ISSN:
0032-5910
Subject:
mixing,   etc   ; behavior; density; duration; flow; industry; particles; technology;     Show all 8 Subjects
Abstract:
... Granular mixing is important to many industries, but the mixing process is still poorly understood. In this study, motion of a single intruder particle introduced in a shallow bed of native particles was investigated. A parametric investigation was carried out to quantify the effects of initial intruder particle location, blade speed, and density difference between similarly sized native and intru ...
DOI:
10.1016/j.powtec.2020.12.002

15. Cross-section-phenomena in rotary drums with sectional internals

Author:
Priessen, Joscha; Kawka, Torben; Behrens, Malte; Schultz, Heyko Juergen
Source:
Powder technology 2021 v.381 pp. 229-244
ISSN:
0032-5910
Subject:
mixing,   etc   ; behavior; drums (equipment); kinetics; mathematical models; technology;     Show all 6 Subjects
Abstract:
... The effect of sectional internals on the solid bed cross section in rotary drums is investigated with a novel, fully optical accessible rotary drum apparatus for different internal configurations. The impact on mixing behavior is analyzed for different section numbers and filling degrees as well as material configurations. The mixing kinetics is affected positively by the sections, particularly fo ...
DOI:
10.1016/j.powtec.2020.11.048

16. Nanoparticle transportation inside a tube with quad-channel tapes involving solar radiation

Author:
Sheikholeslami, M.; Farshad, Seyyed Ali
Source:
Powder technology 2021 v.378 pp. 145-159
ISSN:
0032-5910
Subject:
mixing,   etc   ; Reynolds number; exergy; flow; nanoparticles; solar radiation; transportation;     Show all 7 Subjects
Abstract:
... In this article, nanoparticle turbulent transportation was analyzed with install of helical tape within a solar system. Increasing radial turbulent fluctuation is main concept of utilizing the turbulator. So, install of such device generates secondary flow and produce thinner boundary layer. So, better mixing happens and consequently, cooling rate augments. With growth of secondary flow with rise ...
DOI:
10.1016/j.powtec.2020.09.041

17. Investigation of a thin permeable layer effect on turbulent flow and passive scalar transport in a channel

Author:
Jouybari, Nima Fallah; Lundström, T. Staffan
Source:
Powder technology 2021 v.377 pp. 115-127
ISSN:
0032-5910
Subject:
mixing,   etc   ; particle size; porous media; simulation models; turbulent flow;     Show all 5 Subjects
Abstract:
... Large eddy simulations of turbulent flow and passive scalar transport in a channel partially filled with an array of spherical particles, mimicking a layer of deposited material over a surface, are carried out to investigate the effect of turbulence mixing on the passive scalar transfer rate from the channel wall. It is observed that large turbulence structures generated at the permeable layer-flu ...
DOI:
10.1016/j.powtec.2020.08.068

18. Numerical investigation on the mixing mechanism in a cross-torus paddle mixer using the DEM-CFD method

Author:
Li, Shuo; Kajiwara, Shintaro; Sakai, Mikio
Source:
Powder technology 2021 v.377 pp. 89-102
ISSN:
0032-5910
Subject:
mixing,   etc   ; behavior; equipment design; exhibitions; liquids; mixers; particles; technology; viscosity;     Show all 9 Subjects
Abstract:
... Studies on powder mixing in industrial mixers are crucial for the improved criteria of mixing equipment design and optimization within various mixing unit operations. In the present study, a series of simulation for the powder mixing in an elaborately designed mixer, called a cross-torus paddle mixer, is conducted using the Advanced DEM-CFD method. The effects of various operational parameters on ...
DOI:
10.1016/j.powtec.2020.08.085

19. Discrete element modeling and simulation of non-spherical particles using polyhedrons and super-ellipsoids

Author:
Xie, Changhua; Song, Tao; Zhao, Yongzhi
Source:
Powder technology 2020 v.368 pp. 253-267
ISSN:
0032-5910
Subject:
mixing,   etc   ; algorithms; grinding; mathematical models;     Show all 4 Subjects
Abstract:
... A composite contact algorithm for a complex particle system containing polyhedrons and super-ellipsoids is proposed in this paper to simulate the grinding process of ore in a ball mill. In this algorithm, the contacts between polyhedrons are calculated based on the overlapping volume method, and the contacts between super-ellipsoids are determined by a deepest point method. The contacts between su ...
DOI:
10.1016/j.powtec.2020.05.008

20. Bulk Nanobubbles or Not Nanobubbles: That is the Question

Author:
Jadhav, Ananda J.; Barigou, Mostafa
Source:
Langmuir 2020 v.36 no.7 pp. 1699-1708
ISSN:
1520-5827
Subject:
mixing,   etc   ; acoustics; analytical methods; nanobubbles;     Show all 4 Subjects
Abstract:
... Bulk nanobubbles are a novel nanoscale bubble system with unusual properties which challenge our understanding of bubble behavior. Because of their extraordinary longevity, their existence is still not widely accepted as they are often attributed to the presence of supramolecular structures or contaminants. Nonetheless, bulk nanobubbles are attracting increasing attention in the literature, but re ...
DOI:
10.1021/acs.langmuir.9b03532
PubMed:
32040327
PubMed Central:
PMC7146852