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1. A hierarchical, spherical harmonic-based approach to simulate abradable, irregularly shaped particles in DEM

Author:
Capozza, R.; Hanley, K.J.
Source:
Powder technology 2021 v.378 pp. 528-537
ISSN:
0032-5910
Subject:
particles,   etc   ; shape; technology; texture;     Show all 4 Subjects
Abstract:
... A novel approach is presented for simulating non-spherical particles in the discrete element method (DEM). A particle's shape is described through a hierarchy of representations using spherical harmonic expansions. The expansion is computed at nodes, obtained by discretising the particle's surface. A low-degree expansion, i.e., one containing few terms, is sufficient to approximate a particle's ov ...
DOI:
10.1016/j.powtec.2020.10.015

2. Interaction between shock wave and solid particles: Establishing a model for the change of cloud's expansion rate

Author:
Xiong, Xinyu; Gao, Kai; Zhang, Jing; Li, Bin; Xie, Lifeng; Zhang, Dan; Mensah, Rhoda Afriyie
Source:
Powder technology 2021 v.381 pp. 632-641
ISSN:
0032-5910
Subject:
particle size; particles,   etc   ; acceleration; models; shape; technology; volume;     Show all 7 Subjects
Abstract:
... This study seeks to discover the change of cloud's expansion rate with self-designed shock wave dispersion system. Transmission, diffraction and reflection could be observed intuitively when shock waves passed through solid particle layers. Results show that the longitudinal motion of particle group greatly influenced cloud's volume growth, thus, the maximum rate of longitudinal expansion of cloud ...
DOI:
10.1016/j.powtec.2020.12.033

3. Numerical and experimental investigations of instability in a spouted bed with non-spherical particles

Author:
Wang, Tianyu; Gao, Qinghua; Deng, Aiming; Tang, Tianqi; He, Yurong
Source:
Powder technology 2021 v.379 pp. 231-240
ISSN:
0032-5910
Subject:
particle image velocimetry; particles,   etc   ; bubbles; technology; temperature; velocity;     Show all 6 Subjects
Abstract:
... A spouted bed containing non-spherical particles was investigated numerically using the non-spherical discrete hard-sphere method, and experimentally using particle image velocimetry. The experimental and simulated particle velocity distributions were in agreement. Different operating conditions were used to investigate the instability of the spouted bed. Certain conditions created an S-shaped gas ...
DOI:
10.1016/j.powtec.2020.10.032

4. Derivation and validation of a hard-body particle-wall collision model for non-spherical particles of arbitrary shape

Author:
Quintero, Brian; Laín, Santiago; Sommerfeld, Martin
Source:
Powder technology 2021 v.380 pp. 526-538
ISSN:
0032-5910
Subject:
particles,   etc   ; models; shape; technology; velocity;     Show all 5 Subjects
Abstract:
... In this work an extended three-dimensional model to describe the process of wall collisions of arbitrary shaped non-spherical particles is developed. This model is derived as the generalized solution of the hard-sphere wall collision model described in Crowe et al. (2012) [1]. The validation of the new model is performed versus experimental results of the collision between cylindrical particles an ...
DOI:
10.1016/j.powtec.2020.11.032

5. An assessment of the mathematical models for estimating the coordination number of the packing of multisized particles

Author:
Yi, L.Y.; Zou, R.P.; Pinson, D.; Dong, K.J.; Yu, A.B.
Source:
Powder technology 2021 v.379 pp. 58-68
ISSN:
0032-5910
Subject:
particle size; particle size distribution; particles,   etc   ; literature; mathematical models; paper; prediction; technology;     Show all 8 Subjects
Abstract:
... Coordination number (CN) is an important microscopic parameter in describing the packing of particles. There are a few mathematical models proposed in the literature to calculate the CN of a particle mixture. However, they have not been comprehensively assessed as the experimental data are limited. In this paper, the applicability of three models, respectively proposed by Dodds, Ouchiyama & Tanaka ...
DOI:
10.1016/j.powtec.2020.10.023

6. A coupled polygonal DEM-LBM technique based on an immersed boundary method and energy-conserving contact algorithm

Author:
Wang, Min; Feng, Y.T.; Qu, T.M.; Zhao, T.T.
Source:
Powder technology 2021 v.381 pp. 101-109
ISSN:
0032-5910
Subject:
particles,   etc   ; algorithms; chemical elements; shape; technology; testing;     Show all 6 Subjects
Abstract:
... This work presents a framework of coupling polygonal discrete elements and the lattice Boltzmann method using a direct forcing immersed boundary scheme. In this technique, an energy-conserving contact algorithm is utilized to handle the interactions between convex and concave polygonal particles. The surface of a polygon is represented by discrete boundary points which includes vertices of polygon ...
DOI:
10.1016/j.powtec.2020.11.081

7. Effects of geometrical parameters on the capture efficiency of nanoparticles under the influence of the magnetic field in a stenosed vessel

Author:
Ardalan, Aram; Aminian, Saman; Seyfaee, Ahmad; Gharehkhani, Samira
Source:
Powder technology 2021 v.380 pp. 39-46
ISSN:
0032-5910
Subject:
particles,   etc   ; length; magnetic fields; nanoparticles; neoplasms; wire;     Show all 6 Subjects
Abstract:
... In the present study, the capture efficiency (CE) of nanoparticles flowing in a stenosed vessel was modeled computationally. The effect of parameters including the degree of constriction, constriction length, transversal location of constriction, location of current-carrying wire, and two consecutive occlusions in a cylindrical vessel with localized occlusion under the influence of magnetic field ...
DOI:
10.1016/j.powtec.2020.11.023

8. An error-controlled adaptive time-stepping method for particle advancement in coupled CFD-DEM simulations

Author:
Sitaraman, Hariswaran; Vaidhynathan, Deepthi; Grout, Ray; Hauser, Thomas; Hrenya, Christine M.; Musser, Jordan
Source:
Powder technology 2021 v.379 pp. 203-216
ISSN:
0032-5910
Subject:
particles,   etc   ; accuracy; cooling systems; exhibitions; models;     Show all 5 Subjects
Abstract:
... Coupled Computational-Fluid-Dynamics (CFD) and Discrete-Element-Method (DEM) models provide an accurate description of multiphase physical systems where a solid granular particle phase exists in an underlying gaseous continuous medium. The time integration of the granular phase in these simulations is typically handled using an explicit scheme with a constant time-step among all particles that is ...
DOI:
10.1016/j.powtec.2020.10.051

9. Discharge electrode influence on electrostatic precipitation of nanoparticles

Author:
Andrade, Raíssa Gabrielle Silva Araújo; Guerra, Vádila Giovana
Source:
Powder technology 2021 v.379 pp. 417-427
ISSN:
0032-5910
Subject:
particles,   etc   ; diameter; electrodes; nanoparticles; spatial distribution; wire;     Show all 6 Subjects
Abstract:
... Electrostatic precipitators (ESPs) can achieve high collection efficiencies. However, their application for nanoparticle removal has not been widely discussed, largely because the charging mechanism is affected by the small diameter of these particles. Therefore, this work evaluated the influence of the discharge electrode parameters such as number (1–4), diameter (0.3 and 0.4 mm) and spacing (6.5 ...
DOI:
10.1016/j.powtec.2020.10.087

10. DEM study of particle segregation in a rotating drum with internal diameter variations

Author:
Huang, A.N.; Cheng, T.H.; Hsu, W.Y.; Huang, C.C.; Kuo, H.P.
Source:
Powder technology 2021 v.378 pp. 430-440
ISSN:
0032-5910
Subject:
particles,   etc   ; diameter; drums (equipment); dynamics; technology;     Show all 5 Subjects
Abstract:
... Discrete Element Method (DEM) simulations are carried out to study size segregation of binary mixture in a rotating drum with inner diameter variations. The simulation results agree well with the experimental observations, both indicating that larger particle enrichment occurs in the smaller inner diameter regions. The effect of the inner diameter contracting ratio (CR) on the particle dynamics ar ...
DOI:
10.1016/j.powtec.2020.10.019

11. A stochastic particle replacement strategy for simulating breakage in DEM

Author:
Tavares, Luís Marcelo; das Chagas, Anderson S.
Source:
Powder technology 2021 v.377 pp. 222-232
ISSN:
0032-5910
Subject:
particles,   etc   ; energy; materials; models; technology; testing; weight;     Show all 7 Subjects
Abstract:
... Description of particle breakage embedded in a simulation using the discrete element method (DEM) qualifies it to describe processes in which breakage is either desired or undesired. DEM codes evolved significantly in recent years, many of which describing breakage. In spite of their limitations representing real particles, spheres have several important advantages from the standpoint of computati ...
DOI:
10.1016/j.powtec.2020.08.091

12. A surface mesh represented discrete element method (SMR-DEM) for particles of arbitrary shape

Author:
Zhan, Ling; Peng, Chong; Zhang, Bingyin; Wu, Wei
Source:
Powder technology 2021 v.377 pp. 760-779
ISSN:
0032-5910
Subject:
particles,   etc   ; detection; hybrids; models; shape; surfaces; technology;     Show all 7 Subjects
Abstract:
... A surface mesh represented discrete element method (SMR-DEM) for granular systems with arbitrarily shaped particles is presented. The particle surfaces are approximated using contact nodes obtained from surface mesh. A hybrid contact method which combines the benefits of the sphere-to-sphere and sphere-to-surface approaches is proposed for contact detection and force computation. The simple formul ...
DOI:
10.1016/j.powtec.2020.09.046

13. Motion and equilibrium position of elliptical and rectangular particles in a channel flow of a power-law fluid

Author:
Hu, Xiao; Lin, Jianzhong; Guo, Yu; Ku, Xiaoke
Source:
Powder technology 2021 v.377 pp. 585-596
ISSN:
0032-5910
Subject:
particles,   etc   ; Reynolds number; flow; shape; technology; trajectories;     Show all 6 Subjects
Abstract:
... The inertial migration of the elliptical and rectangular particles in a channel flow of a power-law fluid is studied using the lattice Boltzmann method. The numerical method and code are validated by comparing the present results with the previous ones. Effects of power-law index (n) of the fluid, particle shape, particle aspect ratio (α), blockage ratio (k) and Reynolds number (Re) on the particl ...
DOI:
10.1016/j.powtec.2020.09.028

14. The improvement of flow conditions in a whirlpool with a modified bottom: An experimental study based on particle image velocimetry (PIV)

Author:
Sterczyńska, Monika; Stachnik, Marta; Poreda, Aleksander; Piepiórka-Stepuk, Joanna; Zdaniewicz, Marek; Jakubowski, Marek
Source:
Journal of food engineering 2021 v.289 pp. 110164
ISSN:
0260-8774
Subject:
particle image velocimetry,   etc   ; brewing industry; tea;     Show all 3 Subjects
Abstract:
... A whirlpool is a commonly used separator in breweries for removing the hot trub. The separation is performed in a rotary separator, where the cup of tea effect is exercised. It is an accumulation of the hot trub in the central zone of the separator's bottom in the form of a cone. The purpose of this work is to analyze the possibility to introduce a baffle, in order to intensify the phenomenon of t ...
DOI:
10.1016/j.jfoodeng.2020.110164

15. The interaction of nanoparticulate Fe3O4 during the diffusion-limited aggregation process: A molecular dynamics simulation

Author:
Liu, ZhengJian; Cheng, Qiang; Wang, YaoZu; Li, Kejiang; Wang, Rongrong; Zhang, Jianliang
Source:
Powder technology 2021 v.384 pp. 141-147
ISSN:
0032-5910
Subject:
particle size; particles,   etc   ; adhesion; area; diffusion; molecular dynamics; nanoparticles; neck; paper; potential energy;     Show all 10 Subjects
Abstract:
... Due to the limitations of experimental methods, the study on the aggregation process of nanoparticles is quite insufficient. In this paper, molecular dynamics simulations have been used to investigate the interaction of nanoparticulate Fe₃O₄ (3 nm and 4 nm) during the diffusion-limited aggregation process. Results show that the particle size has a significant influence on the aggregation process, ...
DOI:
10.1016/j.powtec.2020.09.075

16. Inertial measurement unit as a tool within dense phase pneumatic conveying. Investigation into velocity measurement accuracy, pressure and velocity relationships in slug flow

Author:
Lavrinec, A.; Orozovic, O.; Rajabnia, H.; Williams, K.; Jones, M.G.; Klinzing, G.
Source:
Powder technology 2021 v.382 pp. 454-466
ISSN:
0032-5910
Subject:
particle image velocimetry; particles,   etc   ; accuracy; flow; measurement; paper; pressure; slugs; tail; technology; velocity;     Show all 11 Subjects
Abstract:
... This paper presents the results of using an inertial measurement unit (IMU) to study various dynamic relationships in horizontal slug flow pneumatic conveying. The accuracy of the IMU was assessed and compared to particle image velocimetry (PIV) and once good agreement was confirmed it was used to investigate various aspects of slug flow. Relative movement between core particles and slugs tails an ...
DOI:
10.1016/j.powtec.2020.11.015

17. Numerical investigation of flow stratification behavior of binary particle mixture for high-temperature flue gas filtration on an inclined moving bed

Author:
Shen, Mengyao; Tong, Lige; Ding, Hongsheng; Wang, Li; Ding, Yulong
Source:
Powder technology 2021 v.382 pp. 339-350
ISSN:
0032-5910
Subject:
particle size; particles,   etc   ; behavior; filtration; flow; flue gas; mass; pressure; separation; technology; thickness;     Show all 11 Subjects
Abstract:
... Although the filtration efficiency can be increased because of the use of small-sized particles in granular beds, the bed pressure drop may be increased. This study presents a numerical solution of a moving bed that can facilitate instantaneous separation of binary particles into a top layer of larger particles and a bottom layer of smaller particles during the flow. The particle discrete element ...
DOI:
10.1016/j.powtec.2020.12.059

18. Analyzing bulk density and void fraction: B. Effect of moisture content and compression pressure

Author:
Kalman, Haim; Portnikov, Dmitry
Source:
Powder technology 2021 v.381 pp. 285-297
ISSN:
0032-5910
Subject:
particle size; particles,   etc   ; behavior; bulk density; equations; forces; liquids; materials; models; pressure; technology; water content;     Show all 12 Subjects
Abstract:
... This study analyzes the effect of moisture content and compression pressure on bed void fraction in different materials. The void fractions of several materials, both spherical and non-spherical, solid and porous, with different particle sizes and densities, were evaluated as functions of moisture content and compression pressure. In our previous study, the Archimedes number was found to be an app ...
DOI:
10.1016/j.powtec.2020.12.019

19. Experimental and numerical investigations on heterogeneous condensation of insoluble particles in the fluid catalytic cracking unit

Author:
Wang, Jiarui; Wang, Simin; Duan, Xudong; Wen, Jian; Tu, Jiyuan
Source:
Powder technology 2021 v.381 pp. 313-323
ISSN:
0032-5910
Subject:
particle size; particles,   etc   ; catalytic cracking; engineering; equipment; flow; paper; separation; temperature;     Show all 9 Subjects
Abstract:
... In the fluid catalytic cracking (FCC) unit, cyclones possess very less efficiency in the separation of particles smaller than 5 μm. Heterogeneous condensation, one of the most promising preconditioning technologies, can be applied in the FCC unit to improve the particle removal efficiency of cyclones. In this paper, the lab-scale equipment on heterogenous condensation was established and tested. B ...
DOI:
10.1016/j.powtec.2020.11.031

20. Flowability of ultrafine-tailings cemented paste backfill incorporating superplasticizer: Insight from water film thickness theory

Author:
Guo, Zhenbang; Qiu, Jingping; Jiang, Haiqiang; Xing, Jun; Sun, Xiaogang; Ma, Zhengyu
Source:
Powder technology 2021 v.381 pp. 509-517
ISSN:
0032-5910
Subject:
particle size distribution; particles,   etc   ; behavior; density; dosage; flow; technology; thickness; water; water content;     Show all 10 Subjects
Abstract:
... To improve the flowability of ultrafine-tailings cemented paste backfill (UTCPB) while keeping water content low, superplasticizers (SP) are usually used. The water film thickness (WFT) theory was introduced to investigate the flowability of UTCPB incorporating SP. The obtained results show that the packing density of particles increases significantly with the increase of SP dosage due to the impr ...
DOI:
10.1016/j.powtec.2020.12.035