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1. 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

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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

8. 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

9. Mixing of Viscoelastic Fluid Flows in a Coiled Flow Inverter

Author:
Verma, Vikrant; Topalović, Anis; Monechi, Guido; Alsudani, Ali; Nigam, Krishna D. P.; Padding, Johan T.
Source:
Industrial & engineering chemistry process design and development 2020 v.59 no.9 pp. 3854-3864
ISSN:
1520-5045
Subject:
mixing,   etc   ; analytical methods; polymers; viscoelasticity;     Show all 4 Subjects
Abstract:
... Despite having the advantage of a secondary flow pattern in coiled tubes, a very high Dean number is required to induce significant mixing in helical coils, usually implying high shear rates. At very high shear rates, polymer fluids with long molecular chains can be damaged. Therefore, in this study, we investigate the enhancement of mixing of a viscoelastic fluid in a coiled tube at low Dean numb ...
DOI:
10.1021/acs.iecr.9b05142

10. Exploring the role of halide mixing in lead-free BZA₂SnX₄ two dimensional hybrid perovskites

Author:
Pisanu, Ambra; Coduri, Mauro; Morana, Marta; Ciftci, Yasemin O.; Rizzo, Aurora; Listorti, Andrea; Gaboardi, Mattia; Bindi, Luca; Queloz, Valentine I. E.; Milanese, Chiara; Grancini, Giulia; Malavasi, Lorenzo
Source:
Journal of materials chemistry A 2020 v.8 no.4 pp. 1875-1886
ISSN:
2050-7496
Subject:
mixing,   etc   ; cations; geometry; hydrogen bonding;     Show all 4 Subjects
Abstract:
... The role of halide substitution in a lead-free 2D hybrid perovskite is investigated on the BZA₂SnX₄ (BZA = benzylammonium; X = Cl, Br and I) system, by reporting the synthesis and the structural analysis by means of single-crystal X-ray diffraction data of the two novel compositions BZA₂SnBr₄ and BZA₂SnCl₄. In addition, the mixed composition BZA₂Sn(BrₓI₁₋ₓ)₄ (0 ≤ x ≤ 1) has been prepared by mechan ...
DOI:
10.1039/c9ta11923j

11. Comparison of different effective diameter calculating methods for sphero-cylinders by geometrically exact DEM simulations

Author:
Yu, Fuhai; Zhang, Yun; Zheng, Yang; Han, Mengzhi; Chen, Guojie; Yao, Zhihao
Source:
Powder technology 2020 v.360 pp. 1092-1101
ISSN:
0032-5910
Subject:
mixing,   etc   ; angle of repose; powders;     Show all 3 Subjects
Abstract:
... Particle shape plays significant roles in granular mixing. However, most simulations neglect effects of particle shapes owing to the complicated contact detections. Representing non-spherical particles by spherical particles of effective diameters can simplify the process. However, there is no criterion for the selection of effective diameter calculating methods. Therefore, DEM are adopted to inve ...
DOI:
10.1016/j.powtec.2019.10.097

12. Particle near-neighbour separation index for quantification of segregation of granular material

Author:
Chibwe, Deside Kudzai; Evans, Geoffrey Michael; Doroodchi, Elham; Monaghan, Brian Joseph; Pinson, David John; Chew, Sheng J.
Source:
Powder technology 2020 v.360 pp. 481-492
ISSN:
0032-5910
Subject:
mixing,   etc   ; powders; space and time;     Show all 3 Subjects
Abstract:
... In this study, an alternative approach named near-neighbour separation index (NNSI) is proposed which defines mixing and segregation in terms of the nearest-neighbour particle scale methodology to characterise the evolution of particle-particle relationships in granular material flow systems so as to inform the extent of mixing and segregation (homogeneity) in space and time. Use is made of the ge ...
DOI:
10.1016/j.powtec.2019.10.079

13. Liquid–Liquid Equilibrium Data Correlation Using NRTL Model for Different Types of Binary Systems: Upper Critical Solution Temperature, Lower Critical Solution Temperature, and Closed Miscibility Loops

Author:
del Mar Olaya, María; Carbonell-Hermida, Paloma; Trives, Marina; Labarta, Juan A.; Marcilla, Antonio
Source:
Industrial & engineering chemistry process design and development 2020 v.59 no.17 pp. 8469-8479
ISSN:
1520-5045
Subject:
mixing,   etc   ; Gibbs free energy; models; temperature;     Show all 4 Subjects
Abstract:
... In this work, liquid–liquid equilibrium (LLE) data at different temperatures have been correlated for 30 binary systems that presented different miscibility behaviors: 15 upper critical solution temperature (UCST), 5 lower critical solution temperature (LCST), and 10 closed loop LLE region systems. The NRTL model along with an expression frequently used in the literature for the temperature depend ...
DOI:
10.1021/acs.iecr.0c00141

14. Flow past a single stationary sphere, 2. Regime mapping and effect of external disturbances

Author:
Tiwari, Shashank S.; Pal, Eshita; Bale, Shivkumar; Minocha, Nitin; Patwardhan, Ashwin W.; Nandakumar, Krishnaswamy; Joshi, Jyeshtharaj B.
Source:
Powder technology 2020 v.365 pp. 215-243
ISSN:
0032-5910
Subject:
mixing,   etc   ; fluidized beds; powders; turbulent flow;     Show all 4 Subjects
Abstract:
... This review presents a systematic analysis of the published literature on flow regime mapping and effects of external disturbances for flow past a single stationary sphere. Various experimental and numerical investigations have been performed over the past years on such flows over a wide range of Re. The first part of this review (Tiwari et al. [1]) explained the methodologies to carry out these i ...
DOI:
10.1016/j.powtec.2019.04.032

15. Longitudinal and transverse dispersion coefficients of 2D contaminant transport model for mixing analysis in open channels

Author:
Shin, Jaehyun; Seo, Il Won; Baek, Donghae
Source:
Journal of hydrology 2020 v.583 pp. 124302
ISSN:
0022-1694
Subject:
mixing,   etc   ; dispersibility; equations; hydrology; models; tracer techniques;     Show all 6 Subjects
Abstract:
... In this study, longitudinal and transverse dispersion coefficients of the two-dimensional advection-dispersion model were calculated using both the velocity and concentration data obtained through tracer tests in large-scale meandering channels. The velocity-based dispersion coefficients calculated by applying the theoretical equations to the velocity data were compared with concentration-based di ...
DOI:
10.1016/j.jhydrol.2019.124302

16. Improving the steam-cracking efficiency of naphtha feedstocks by mixed/separate processing

Author:
Karaba, Adam; Dvořáková, Veronika; Patera, Jan; Zámostný, Petr
Source:
Journal of analytical and applied pyrolysis 2020 v.146 pp. 104768
ISSN:
0165-2370
Subject:
mixing,   etc   ; ethylene; feedstocks; propylene; pyrolysis; temperature;     Show all 6 Subjects
Abstract:
... Naphtha feedstock used for the steam-cracking process is typically blended from several hydrocarbon source streams of composition varying in a broad range. This study aims at evaluation of the potential yield improvement, which could be obtained by separate steam-cracking of light and heavy sub-streams using tailored process parameters for each of the sub-streams. Laboratory pyrolysis reactor was ...
DOI:
10.1016/j.jaap.2019.104768

17. Passive micromixer with baffles distributed on both sides of microchannels based on the Koch fractal principle

Author:
Chen, Xueye; Tian, Yue
Source:
Journal of chemical technology and biotechnology 2020 v.95 no.3 pp. 806-812
ISSN:
0268-2575
Subject:
mixing,   etc   ; organ-on-a-chip; simulation models;     Show all 3 Subjects
Abstract:
... Since the beginning of the 21st Century, the development of microfluidic chip technology has been very rapid and has attracted the attention of more and more scholars. As an important part of the microfluidic chip, the performance of the micromixer is critical. The fractal structure in the microchannels helps to improve the mixing performance of the micromixer and improve the mixing efficiency of ...
DOI:
10.1002/jctb.6270

18. Towards reliable optimization of metal powder—Lubricant mixing for high die filling performance: Exploring a rheology based approach

Author:
Nijikovsky, Boris; Aguirre Perales, Lydia; Brika, Salah Eddine; Brailovski, Vladimir
Source:
Powder technology 2020 v.362 pp. 168-176
ISSN:
0032-5910
Subject:
mixing,   etc   ; filling (processing); industry; lithium; lubricants; rheology;     Show all 6 Subjects
Abstract:
... A previously unreported approach to optimize the time of an industry scale mixing operation for best filling performance, while ensuring premix uniformity, is tested. Mixing a base metal powder with a lubricant facilitates compacting and ejecting of powder compacts. However, the quality of lubricant admixing directly influences premix flowability and, therefore, the die filling performance of the ...
DOI:
10.1016/j.powtec.2019.12.003

19. Efficient Organic Solar Cells Based on Non-Fullerene Acceptors with Two Planar Thiophene-Fused Perylene Diimide Units

Author:
Liu, Juncheng; Lu, Hao; Liu, Yahui; Zhang, Jianqi; Li, Cuihong; Xu, Xinjun; Bo, Zhishan
Source:
ACS applied materials & interfaces 2020 v.12 no.9 pp. 10746-10754
ISSN:
1944-8252
Subject:
mixing,   etc   ; electron transfer; polymers; solar cells;     Show all 4 Subjects
Abstract:
... We designed and synthesized two non-fullerene acceptors (CDT-TFP and C8X-TFP), which comprise a central 4H-cyclopenta[2,1-b:3,4-b′]dithiophene (CDT) as the bridge and two thiophene-fused perylene diimide (TFP) units. The bulky side chains, such as the 4-hexylphenyl side chains, on the CDT bridge can effectively prevent the acceptor molecules from forming large aggregates, and the π–π stacking of t ...
DOI:
10.1021/acsami.9b22927

20. DEM simulation of cubical particle percolation in a packed bed

Author:
Kou, Mingyin; Zhou, Heng; Wu, Shengli; Shen, Yansong
Source:
Powder technology 2020 v.361 pp. 306-314
ISSN:
0032-5910
Subject:
mixing,   etc   ; dispersibility; friction; particle size; powders; rolling;     Show all 6 Subjects
Abstract:
... In this paper, percolation of cubical particles through a packed bed is studied using discrete element method (DEM). The influences of some key variables e.g. restitution coefficient, sliding coefficient, rolling coefficient and diameter ratio on cubical particles percolation behaviour were comprehensively analyzed. The results show that, compared with the sphere particles, cubical particles also ...
DOI:
10.1016/j.powtec.2019.08.012