Particle shape effects on the effective permittivity of anisotropic or isotropic media consisting of aligned or randomly oriented ellipsoidal particles

2000 ◽  
Vol 36 (10) ◽  
pp. 2821-2833 ◽  
Author(s):  
Scott B. Jones ◽  
Shmulik P. Friedman
Keyword(s):  
Particle Shape ◽  
Effective Permittivity ◽  
Ellipsoidal Particles ◽  
Isotropic Media ◽  
Shape Effects

Fuel particle shape effects in the packed bed combustion of wood

2018 ◽  
Vol 198 ◽  
pp. 100-111 ◽  
Author(s):  
Élizabeth Trudel ◽  
William L.H. Hallett ◽  
Evan Wiens ◽  
Jeremiah D. O'Neil ◽  
Marina K. Busigin ◽  
...  
Keyword(s):  
Particle Shape ◽  
Packed Bed ◽  
Fuel Particle ◽  
Shape Effects

scholarly journals Aspect-ratio-dependent interaction of molecular polymer brushes and multicellular tumour spheroids

2018 ◽  
Vol 9 (25) ◽  
pp. 3461-3465 ◽  
Author(s):  
Markus Müllner ◽  
Kylie Yang ◽  
Amandeep Kaur ◽  
Elizabeth J. New
Keyword(s):  
Aspect Ratio ◽  
Surface Chemistry ◽  
Particle Shape ◽  
Polymer Brushes ◽  
Design Parameters ◽  
Tumour Spheroid ◽  
Tumour Spheroids ◽  
Shape Effects ◽  
Nanoparticle Design ◽  
Dependent Interaction

Molecular polymer brushes allow for independent tailoring of nanoparticle design parameters. Brush particles with altered shape and aspect ratio revealed that particle shape effects may be decoupled from surface chemistry to achieve higher tumour spheroid interaction and penetration.

scholarly journals Particle shape effects on the stress response of granular packings

Soft Matter ◽  
2014 ◽  
Vol 10 (1) ◽  
pp. 48-59 ◽  
Author(s):  
Athanasios G. Athanassiadis ◽  
Marc Z. Miskin ◽  
Paul Kaplan ◽  
Nicholas Rodenberg ◽  
Seung Hwan Lee ◽  
...  
Keyword(s):  
Stress Response ◽  
Particle Shape ◽  
Shape Effects ◽  
Granular Packings

scholarly journals Dielectric Polarization and Particle Shape Effects

2007 ◽  
Vol 2007 ◽  
pp. 1-9 ◽  
Author(s):  
Ari Sihvola
Keyword(s):  
Circular Cylinder ◽  
Particle Shape ◽  
Material Modeling ◽  
Dielectric Polarization ◽  
Surface Geometry ◽  
Surface Parameters ◽  
Regular Polyhedra ◽  
Shape Effects ◽  
Different Shapes ◽  
Effect Of Surface

This article reviews polarizability properties of particles and clusters. Especially the effect of surface geometry is given attention. The important parameter of normalized dipolarizability is studied as function of the permittivity and the shape of the surface of the particle. For nonsymmetric particles, the quantity under interest is the average of the three polarizability dyadic eigenvalues. The normalized polarizability, although different for different shapes, has certain universal characteristics independent of the inclusion form. The canonical shapes (sphere, spheroids, ellipsoids, regular polyhedra, circular cylinder, semisphere, double sphere) are studied as well as the correlation of surface parameters with salient polarizability properties. These geometrical and surface parameters are essential in the material modeling problems in the nanoscale.

Particle shape effects due to crushing method and size

1986 ◽  
Vol 16 (1-2) ◽  
pp. 109-123 ◽  
Author(s):  
T.E. Durney ◽  
T.P. Meloy
Keyword(s):  
Particle Shape ◽  
Shape Effects

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.

Particle shape effects on fabric of granular random packing

2017 ◽  
Vol 310 ◽  
pp. 175-186 ◽  
Author(s):  
Shiwei Zhao ◽  
Nan Zhang ◽  
Xiaowen Zhou ◽  
Lei Zhang
Keyword(s):  
Particle Shape ◽  
Random Packing ◽  
Shape Effects
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