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1. Influence of mechanical integrity during pneumatic conveying on the bulk handling and rehydration properties of agglomerated dairy powders

Author:
Hazlett, R.; Schmidmeier, C.; O'Mahony, J.A.
Source:
Journal of food engineering 2021 v.288 pp. 110103
ISSN:
0260-8774
Subject:
particle size,   etc   ; bulk density; dispersibility; dried milk; infant formulas; powders; rehydration; solubility; wettability; whey protein concentrate;     Show all 10 Subjects
Abstract:
... Agglomerated powders are susceptible to breakdown on handling, most notably, during powder conveying. In this study, three agglomerated dairy powders (whey protein concentrate powder, WPC; fat-filled milk powder, FFMP and infant formula powder, IF) were conveyed through a custom-fabricated dispersion rig to understand the effects of agglomerate breakdown on dairy powder handling and application. A ...
DOI:
10.1016/j.jfoodeng.2020.110103

2. Studying the orifice jamming of a polydispersed particle system via coupled CFD–DEM simulations

Author:
Xu, Shanlin; Sun, Honglei; Cai, Yuanqiang; Geng, Xueyu
Source:
Powder technology 2020 v.368 pp. 308-322
ISSN:
0032-5910
Subject:
particle size; particle size distribution,   etc   ; probability; sand;     Show all 4 Subjects
Abstract:
... Jamming of particles is a phenomenon that occurs widely in our daily life and nature. However, the jamming of the polydispersed particle systems, such as sand particles, have rarely been studied and are not well understood. Thus, this work conducted CFD–DEM simulations to study the jamming of a polydispersed particle system with a log-normal particle size distribution. The simulation results show ...
DOI:
10.1016/j.powtec.2020.01.003

3. Investigation of powder flowability at low stresses: Influence of particle size and size distribution

Author:
Stavrou, Alexandros Georgios; Hare, Colin; Hassanpour, Ali; Wu, Chuan-Yu
Source:
Powder technology 2020 v.364 pp. 98-114
ISSN:
0032-5910
Subject:
particle size; particle size distribution,   etc   ; glass; hardness;     Show all 4 Subjects
Abstract:
... At moderate stresses, shear cells are the preferred method of powder flow measurement. However, several industrial processes operate at low stresses, where the determination of unconfined yield strength by the shear cell technique may be inconsistent, or found not to correlate with observed behaviour. Alternatively, ball indentation can be used, which directly measures hardness; related to unconfi ...
DOI:
10.1016/j.powtec.2020.01.068

4. Gas–solid two-phase flow and erosion calculation of gate valve based on the CFD-DEM model

Author:
Lin, Zhe; Sun, Xiwang; Yu, Tianci; Zhang, Yifan; Li, Yi; Zhu, Zuchao
Source:
Powder technology 2020 v.366 pp. 395-407
ISSN:
0032-5910
Subject:
particle size,   etc   ; conveyors; models;     Show all 3 Subjects
Abstract:
... Gate valves are important pipeline components in pneumatic conveying systems, and they were eroded severely by the impact of solid particles. In this study, the CFD-DEM simulation method was adopted to study the gas–solid two-phase flow characteristics and erosion characteristics of the gate valve. The accuracy of the simulation was validated by comparing the simulation and experimental data. Resu ...
DOI:
10.1016/j.powtec.2020.02.050

5. Abnormal size effect of particle breakage probability under repeated impacts

Author:
Sun, Hanqing; Zeng, Yawu; Ye, Yang; Chen, Xi; Zeng, Tiancheng
Source:
Powder technology 2020 v.363 pp. 629-641
ISSN:
0032-5910
Subject:
particle size,   etc   ; energy; probability;     Show all 3 Subjects
Abstract:
... Particles may break after multiple impacts even during low-velocity collisions. Breakage probability is one of the key factors affecting the particle fragmentation. To investigate the effect of particle size on breakage probability, 44 sets of repeated impact experiments were conducted using a new particle impact device. Marble spheres with different diameters were repeatedly impacted against thre ...
DOI:
10.1016/j.powtec.2020.01.026

6. CFD-DEM study of bridging mechanisms at the static solid-liquid surface filtration

Author:
Hund, David; Lösch, Philipp; Kerner, Maximilian; Ripperger, Siegfried; Antonyuk, Sergiy
Source:
Powder technology 2020 v.361 pp. 600-609
ISSN:
0032-5910
Subject:
particle size,   etc   ; filtration; models;     Show all 3 Subjects
Abstract:
... In static surface filtration processes with filter media which pores are bigger than the particle size, the formation of bridges from particles over the pores is of crucial importance for the creation of the first particle layer and interference resistance of the filter. To achieve a better understanding of the bridging mechanisms, a numerical study of the particle deposition with a three-dimensio ...
DOI:
10.1016/j.powtec.2019.11.072

7. DEM study on the packing density and randomness for packing of ellipsoids

Author:
Gan, Jieqing; Yu, Aibing
Source:
Powder technology 2020 v.361 pp. 424-434
ISSN:
0032-5910
Subject:
particle size,   etc   ; particles; vibration;     Show all 3 Subjects
Abstract:
... This paper presents a numerical study on the packing density and bed orderness in packing and vibration of ellipsoids by discrete element method (DEM). The shapes considered are oblate and prolate spheroids, with aspect ratio varying from 0.15 to 4.0. It is shown that under the poured packing conditions of coarse ellipsoids, flat or elongate particles show strong orientation preference on the hori ...
DOI:
10.1016/j.powtec.2019.07.012

8. Segregation of granular binary mixtures with large particle size ratios during hopper discharging process

Author:
Zhang, T.F.; Gan, J.Q.; Yu, A.B.; Pinson, D.; Zhou, Z.Y.
Source:
Powder technology 2020 v.361 pp. 435-445
ISSN:
0032-5910
Subject:
particle size,   etc   ; geometry; porosity;     Show all 3 Subjects
Abstract:
... Particle mixtures with a wide range of sizes, shapes, and densities may experience significant segregation. In the hopper discharging process, segregation predominantly happens on the free surface of mixtures with size ratio <5.0. However, when size ratio is much larger, the segregation developed is still not fully understood. Hence, this work aims to investigate the segregation of granular materi ...
DOI:
10.1016/j.powtec.2019.07.010

9. Discrete element modeling of particle breakage considering different fragment replacement modes

Author:
Zhou, Wei; Wang, Di; Ma, Gang; Cao, Xuexin; Hu, Chao; Wu, Wei
Source:
Powder technology 2020 v.360 pp. 312-323
ISSN:
0032-5910
Subject:
particle size,   etc   ; models; powders;     Show all 3 Subjects
Abstract:
... Granular breakage is a common phenomenon among rockfill dams, mineral engineering, and geological phenomenon. In this work, we perform one-dimensional compression tests using the discrete element method to study the influences of fragmentation patterns during comminution. Our results show that small fragments increase the coordination number of larger particles and create “hydrostatic” confinement ...
DOI:
10.1016/j.powtec.2019.10.002

10. Experimental and numerical investigation on the packing of binary mixtures of spheres and ellipsoids

Author:
Li, C.X.; Zhou, Z.Y.; Zou, R.P.; Pinson, D.; Shen, Y.S.; Yu, A.B.
Source:
Powder technology 2020 v.360 pp. 1210-1219
ISSN:
0032-5910
Subject:
particle size,   etc   ; models; powders;     Show all 3 Subjects
Abstract:
... The packing of binary mixtures of spheres and ellipsoids are investigated by both physical experiments and discrete element method (DEM) in this work. The DEM model is first validated through comparison with experimental results in terms of packing density. The equivalent packing diameter is confirmed to be much better than the equivalent volume diameter in the characterization of particle size of ...
DOI:
10.1016/j.powtec.2019.10.103

11. A mineral liberation distribution estimator for monitoring and process control applications

Author:
Pérez-García, E.M.; Bouchard, J.; Poulin, É.
Source:
Powder technology 2020 v.367 pp. 527-538
ISSN:
0032-5910
Subject:
particle size; particle size distribution,   etc   ; monitoring; process control;     Show all 4 Subjects
Abstract:
... Particle size control in mineral processing is typically achieved using an index characterising the whole distribution, e.g. the sieve opening through which a given mass fraction of the population would pass. Although mineral liberation is the goal of size reduction, its use for monitoring and process control applications is not reported because its online measuring is currently not possible. This ...
DOI:
10.1016/j.powtec.2020.04.002

12. Promoting the removal of fine particles by turbulent agglomeration with the coupling of different-scale vortexes

Author:
Sun, Zongkang; Yang, Linjun; Chen, Shuai; Wu, Xin
Source:
Powder technology 2020 v.367 pp. 399-410
ISSN:
0032-5910
Subject:
particle size; particle size distribution,   etc   ; particle physics; powders; turbulent flow;     Show all 5 Subjects
Abstract:
... To improve the particle agglomeration and removal effect by turbulent agglomeration, the coupling of different-scale vortexes in turbulent flow field was proposed and a turbulent agglomerator containing different types of vortex sheets was constructed and applied. The particle agglomeration efficiency, size distribution and removal effect by ESP through it were investigated experimentally. The res ...
DOI:
10.1016/j.powtec.2020.03.062

13. The link between particle size and froth stability - Implications for reprocessing of flotation tailings

Author:
Mackay, I.; Videla, A.R.; Brito-Parada, P.R.
Source:
Journal of cleaner production 2020 v.242 pp. 118436
ISSN:
0959-6526
Subject:
particle size; particle size distribution,   etc   ; copper; industry; mine tailings; minerals;     Show all 6 Subjects
Abstract:
... Historic tailings dams can often be considered as valuable mineral reserves due to the declining head grades of primary deposits. The reprocessing of such material is of great interest to the minerals processing industry, not only from an economic point of view, but also from an environmental one. However, tailings material is generally comprised of fine particles, which poses a challenge for its ...
DOI:
10.1016/j.jclepro.2019.118436

14. On the derivation of the Smoluchowski result of electrophoretic mobility

Author:
Klaseboer, Evert; Chan, Derek Y.C.
Source:
Journal of colloid and interface science 2020 v.568 pp. 176-184
ISSN:
0021-9797
Subject:
particle size,   etc   ; electrolytes; electrophoresis; hydrodynamics;     Show all 4 Subjects
Abstract:
... One of the most enduring, broadly applicable and widely used theoretical results of electrokinetic theory is the Smoluchowski expression for the electrophoretic mobility. It is a limiting form that holds for any solid particle of arbitrary shape in an electrolyte of any composition provided the thickness of the electrical double layer is “infinitely” thin compared to the particle size and the part ...
DOI:
10.1016/j.jcis.2020.02.032

15. Concentration distribution and deposition limit of medium-coarse sand-water slurry in inclined pipe

Author:
Vlasák, Pavel; Matoušek, Václav; Chára, Zdeněk; Krupička, Jan; Konfršt, Jiří; Kesely, Mikoláš
Source:
Journal of hydrology and hydromechanics 2020 v.68 no.1 pp. 83-91
ISSN:
1338-4333
Subject:
particle size distribution,   etc   ; quartz; slurries;     Show all 3 Subjects
Abstract:
... Sand-water slurry was investigated on an experimental pipe loop of inner diameter D = 100 mm with the horizontal, inclined, and vertical smooth pipe sections. A narrow particle size distribution silica sand of mean diameter 0.87 mm was used. The experimental investigation focused on the effects of pipe inclination, overall slurry concentration, and mean velocity on concentration distribution and d ...
DOI:
10.2478/johh-2019-0023

16. Strong grain-size effect on martensitic transformation in high-carbon steels made by powder metallurgy

Author:
Jiang, Tao; Sun, Junjie; Wang, Yingjun; Liu, Hongji; Guo, Shengwu; Liu, Wenqing; Liu, Yongning
Source:
Powder technology 2020 v.363 pp. 652-656
ISSN:
0032-5910
Subject:
particle size,   etc   ; metallurgy; particles; steel;     Show all 4 Subjects
Abstract:
... The effect of prior austenite grain size on martensitic transformation has been studied in a high‑carbon steel with the composition of 1.0C-1.5Cr-0.3Mn-0.3Si-Fe (wt%). Powder metallurgy was used to obtain different grain-sized samples given its high performance to resist grain growth during austenitization. It is found that transformation twin is suppressed and replaced by dislocation martensite w ...
DOI:
10.1016/j.powtec.2020.01.002

17. Filling of a grain silo. Part 2: A new filling method for uniform distribution of fines in a small scale silo

Author:
Nourmohamadi-Moghadami, A.; Zare, D.; Stroshine, R.L.; Kamfiroozi, S.
Source:
Biosystems engineering 2020 v.191 pp. 157-167
ISSN:
1537-5110
Subject:
particle size,   etc   ; aeration; corn; silos;     Show all 4 Subjects
Abstract:
... During top filling of a storage silo, granular material containing a range of particle sizes, the smaller particles (fine material) accumulate under the filling point. This interferes with air distribution preventing effective aeration of regions with higher percentages of fine material. In the first part of the study, the distribution of broken corn and foreign material (BCFM) was investigated in ...
DOI:
10.1016/j.biosystemseng.2020.01.001

18. Experimental investigation of the grade efficiency of a zigzag separator

Author:
Lukas, Eduard; Roloff, Christoph; van Wachem, Berend; Thévenin, Dominique
Source:
Powder technology 2020 v.369 pp. 38-52
ISSN:
0032-5910
Subject:
particle size distribution,   etc   ; air; diffusivity; glass; separators;     Show all 5 Subjects
Abstract:
... An experimental study is conducted on a pilot-scale zigzag air separator (ZZS) to study the effects of varying the solid feed mass stream, the mean channel air velocity, and the number of channel segments onto the grade efficiency. Spherical glass beads are classified. A straight pipe separator model (PSM) is modified for the ZZS and fitted to the experimental data to estimate the relative cut-poi ...
DOI:
10.1016/j.powtec.2020.03.001

19. Effect of water–fog particle size on dust fall efficiency of mechanized excavation face in coal mines

Author:
Fang, Xueming; Yuan, Liang; Jiang, Bingyou; Zhu, Wenjun; Ren, Bo; Chen, Minggong; Mu, Min; Yu, Guofeng; Li, Peng
Source:
Journal of cleaner production 2020 v.254 pp. 120146
ISSN:
0959-6526
Subject:
particle size,   etc   ; coal; dust; mechanization; mists; spraying;     Show all 6 Subjects
Abstract:
... Respiratory dust and dust fall from the mechanized excavation faces of coal mines are crucial issues that require immediate attention. The dust fall technique for two-phase gas–water spraying is effective in solving these issues. We designed a spray dust fall simulated experimental system to test the dust fall efficiency for six grain sizes of water mist: D50 = 9.00 μm, 18.75 μm, 29.87 μm, 49.85 μ ...
DOI:
10.1016/j.jclepro.2020.120146

20. Parameter determination of the Compressible Packing Model (CPM) for concrete application

Author:
Bala, Mokrane; Zentar, Rachid; Boustingorry, Pascal
Source:
Powder technology 2020 v.367 pp. 56-66
ISSN:
0032-5910
Subject:
particle size distribution,   etc   ; concrete; industry; models;     Show all 4 Subjects
Abstract:
... The packing density of granular materials is in the centre of interest of many industries. For concrete industry, the packing density of aggregates is the most representative physical parameter of the granular mixtures: it combines the grain size and the morphology of grains. Compressible Packing Model (CPM) accurately predicts packing density by involving three parameters: wall effect coefficient ...
DOI:
10.1016/j.powtec.2019.11.085