DEM simulation of bead motion during wet bead milling using an enlarged particle model

2012 ◽  
Vol 114-117 ◽  
pp. 93-99 ◽  
Author(s):  
Yasuhiro Yamamoto ◽  
Rikio Soda ◽  
Junya Kano ◽  
Fumio Saito
Keyword(s):  
Particle Model ◽  
Dem Simulation ◽  
Bead Milling ◽  
Wet Bead Milling

Influence of Particle Shape and Contact Parameters on DEM-Simulated Bulk Density of Wheat

2020 ◽  
Vol 63 (6) ◽  
pp. 1657-1672
Author(s):  
Marvin C. Petingco ◽  
Mark E. Casada ◽  
Ronaldo G. Maghirang ◽  
Oladiran O. Fasina ◽  
Zhengpu Chen ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Bulk Density ◽  
Particle Shape ◽  
Static Friction ◽  
Rolling Friction ◽  
Particle Model ◽  
Dem Simulation ◽  
Aspect Ratios ◽  
Ellipsoidal Particles ◽  
Contact Parameters

HighlightsDecreasing aspect ratio and improved geometrical smoothness of particles increased DEM-predicted bulk density of wheat.Among the three particle models, the 5-sphere ellipsoidal particle was the best option to represent wheat particles, as indicated by the simulated bulk densities that best agreed with the experiments.Among the contact parameters, the wheat-to-wheat coefficient of static friction and wheat-surface coefficient of rolling friction had the greatest influence on simulated bulk density.Abstract. The discrete element method (DEM) has been shown to be an effective tool for simulating the behavior of granular material. The accuracy of simulations depends highly on the contact models, particle physical parameters, and contact parameters used. The objectives of this study were to determine the influence of particle shape and contact parameters on simulated wheat bulk density and to develop an effective wheat particle model for DEM simulation of filling a container using EDEM software. Grain characteristics, including single-kernel weight, kernel density, kernel dimensions, aspect ratio, and bulk density, were determined for three size fractions of wheat used in the experiments. Three categories of particle models (5-sphere pseudo-ellipsoidal, 7-sphere pseudo-ellipsoidal, and ASG-generated) with varying aspect ratios and geometrical smoothness were tested in the simulations. Results showed that DEM-simulated bulk density of wheat increased with lower aspect ratio and greater geometrical smoothness of pseudo-ellipsoidal particles (7-sphere versus 5-sphere). Increasing the number of spheres to approximately 30 for better representation of wheat kernel shape, using ASG-generated particles, did not reproduce the trend of greater simulated bulk density seen in the experiments. Among the six contact parameters, the wheat-wheat coefficient of static friction and wheat-surface coefficient of rolling friction had the most significant effect on the simulated bulk density. Among the different sets of particle models, the 5-sphere pseudo-ellipsoidal particles, having aspect ratios close to that of wheat kernels in each size fraction, were found to be the most practical and appropriate particle model for use in DEM simulation of wheat bulk density. This study contributes to better understanding of the influence of particle shape and contact parameters on DEM-simulated bulk density and provides a calibrated particle model for use in simulating container filling operations. Keywords: Bulk density, Contact parameters, DEM, Particle shape, Wheat.

scholarly journals Green Synthesis of Silver Nanoparticles by Low-Energy Wet Bead Milling of Metal Spheres

Materials ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 63 ◽  
Author(s):  
Andrea Pietro Reverberi ◽  
Marco Vocciante ◽  
Marco Salerno ◽  
Maurizio Ferretti ◽  
Bruno Fabiano
Keyword(s):  
Silver Nanoparticles ◽  
Cost Effective ◽  
Low Energy ◽  
One Pot ◽  
Initial Shape ◽  
Bead Milling ◽  
Metal Precursor ◽  
Aqueous Solvent ◽  
Wet Bead Milling ◽  
Shape And Size

A low-energy, magnetically-driven milling technique for the synthesis of silver nanoparticles is proposed, where the grinding medium and the metal precursor consisting of silver spheres have the same shape and size, belonging to a millimetric scale. The process is carried out at room temperature in aqueous solvent, where different types of capping agents have been dissolved to damp particle agglomeration. The particle diameters, determined by dynamic light scattering and transmission electron microscopy, have been compared with those typical of conventional wet-chemical bottom-up synthesis processes. The use of milling spheres and metal precursor of the same initial shape and size allows to overcome some drawbacks and limitations distinctive of conventional bead-milling equipment, generally requiring complex operations of separation and recovery of milling media. The milling bead/nanoparticle diameter ratio obtained by this approach is higher than that typical of most previous wet bead milling techniques. The method described here represents a simple, one-pot, cost-effective, and eco-friendly process for the synthesis of metal nanoparticles starting from a bulky solid.

Design space approach in the development of esculetin nanocrystals by a small-scale wet-bead milling process

2020 ◽  
Vol 55 ◽  
pp. 101486 ◽  
Author(s):  
Jieyu Zuo ◽  
Gabriel Lima Barros de Araujo ◽  
Marco Antonio Stephano ◽  
Zhengyun Zuo ◽  
Nádia Araci Bou-Chacra ◽  
...  
Keyword(s):  
Design Space ◽  
Milling Process ◽  
Small Scale ◽  
Bead Milling ◽  
Wet Bead Milling ◽  
Space Approach

scholarly journals Discrete Element Simulation of Orthogonal Machining of Soda-Lime Glass with Seed Cracks

2020 ◽  
Vol 4 (1) ◽  
pp. 5 ◽  
Author(s):  
Guang Yang ◽  
Hazem Alkotami ◽  
Shuting Lei
Keyword(s):  
High Performance ◽  
High Hardness ◽  
Soda Lime ◽  
Discrete Element ◽  
Particle Model ◽  
Soda Lime Glass ◽  
Machining Performance ◽  
Machining Processes ◽  
Dem Simulation ◽  
Orthogonal Machining

Demands for producing high quality glass components have been increasing due to their superior mechanical and optical properties. However, due to their high hardness and brittleness, they present great challenges to researchers when developing new machining processes. In this work, the discrete element method (DEM) is used to simulate orthogonal machining of synthetic soda-lime glass workpieces that are created using a bonded particle model and installed with four different types of seed cracks. The effects of these seed cracks on machining performance are studied and predicted through the DEM simulation. It is found that cutting force, random cracks, and surface roughness are reduced by up to 90%, 74%, and 47%, respectively, for the workpieces with seed cracks compared to the regular ones. The results show that high performance machining through DEM simulation can be achieved with optimal seed cracks.

Fabrication of Cu(In,Ga)Se2 Films by a Combination of Mechanochemical Synthesis, Wet Bead Milling, and a Screen Printing/sintering Process

2009 ◽  
Vol 1165 ◽  
Author(s):  
Junya Kubo ◽  
Yoshihiro Matsuo ◽  
Takahiro Wada ◽  
Akira Yamada ◽  
Makoto Konagai
Keyword(s):  
Mechanochemical Synthesis ◽  
Screen Printing ◽  
Sintering Process ◽  
Bead Milling ◽  
Cigs Solar Cell ◽  
Screen Printing Technique ◽  
Average Grain Size ◽  
Gas Atmosphere ◽  
Printing Technique ◽  
Wet Bead Milling

AbstractWe prepared fine Cu(In,Ga)Se2 (CIGS) powder suitable for screen printing using a mechanochemical synthesis and wet bead milling. Particulate precursors were deposited in a layer by a screen-printing technique, and the porous precursor layer was sintered into a dense polycrystalline film by atmospheric-pressure firing in an N2 gas atmosphere. The microstructure of CIGS powder and fired CIGS film were observed in an SEM. The wet bead milling was effective for the reduction and homogenization of the average grain size of CIGS powder. The CIGS grains in the film were well sintered and the size of CIGS grains was as large as about 2 μm. The CIGS solar cell showed an efficiency of 3.1%, with Voc of 0.279 V, Jsc of 28.8 mA/cm2 and FF of 0.386.

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