A Method for the Routine Measurement of Particle Shape Factors in the Sieve Range

Nature ◽  
1960 ◽  
Vol 187 (4735) ◽  
pp. 401-403 ◽  
Author(s):  
COLIN C. HARRIS
Keyword(s):  
Particle Shape ◽  
Shape Factors ◽  
Routine Measurement

A Method for the Routine Measurement of Particle Shape Factors in the Sieve Range

Nature ◽  
1960 ◽  
Vol 187 (4735) ◽  
pp. 403-403
Author(s):  
D. HOWITT
Keyword(s):  
Particle Shape ◽  
Shape Factors ◽  
Routine Measurement

Quantitative Characterization of Particle Shape of FCC Catalysts by Image Analysis

2001 ◽  
Vol 7 (S2) ◽  
pp. 1086-1087
Author(s):  
Zhengmin Li ◽  
Xingzhong Xu ◽  
Jinghe Yang ◽  
Xiuling Xu ◽  
Weijun Yu ◽  
...  
Keyword(s):  
Particle Shape ◽  
Glass Slide ◽  
Oil Refinery ◽  
Quantitative Characterization ◽  
Shape Factors ◽  
Fcc Catalyst ◽  
Fluidized Catalytic Cracking ◽  
Attrition Resistance ◽  
Fcc Catalysts

In the fluidized catalytic cracking (FCC) unit of oil refinery, the attrition resistance of FCC catalysts is affected by particle shape. Although some sophisticated methods, such as Fractal dimension and Fourier analysis, have been introduced to particle shape analysis, most of them are used to assess the shape of individual particle. It is difficult to be used as a means of powder quality control in the course of application and production of FCC catalysts. So three shape factors, i.e. Short/long ratio (S), Roundness (R) and Concavity (C), are applied to characterize them in three different aspects.A small quantity of FCC catalyst powders were spread on a glass slide M and a thin layer of glue was spread on another glass slide N, then all the particles on slide M were sprinkled on slide N by vibrating manually up and down, in the meantime moving back and forth more than 10 times.

scholarly journals Numerical Study of Particle Morphology Effect on the Angle of Repose for Coarse Assemblies Using DEM

2019 ◽  
Vol 2019 ◽  
pp. 1-15 ◽  
Author(s):  
Jing Chen ◽  
Rui Gao ◽  
Yangzepeng Liu
Keyword(s):  
Particle Shape ◽  
Laboratory Tests ◽  
Sliding Friction ◽  
Numerical Study ◽  
Dominant Role ◽  
Particle Morphology ◽  
Angle Of Repose ◽  
Shape Effect ◽  
Shape Factors ◽  
Coefficient Of Sliding Friction

The morphologies of coarse particles are usually irregular and play a dominant role in the mechanical behaviors of the particle assemblies. This paper quantitatively studies the effect of particle shape on the angle of repose, which is an important macroscopic parameter for ballast materials, via laboratory tests and numerical simulations by means of the discrete element method (DEM). Forty ballast particle templates and four simply created clump templates are reconstructed using an image-based method and quantified with two shape factors, sphericity and convexity. A series of simulations are conducted with the coefficient of sliding friction between particles changing from 0.2 to 0.6 at an interval of 0.1 to study its influence on various shapes of particles, and an appropriate value of sliding friction coefficient is chosen for the comparison of particle shape effect. The results show that increasing sphericity and convexity can significantly decrease the angle of repose, and the real ballast model gives a more realistic angle of repose behaviors as that of laboratory tests compared to simply created models. By analyzing the characteristics of particle motions and contacts from a microscopic perspective, the mechanism of particle shape attributed to the formation of granular aggregation is also discussed and revealed in this research.

scholarly journals Particle shape factors and fractal dimension after large shear strains in carbonate sand

2018 ◽  
Vol 8 (1) ◽  
pp. 73-79 ◽  
Author(s):  
X. Zhang ◽  
W. Hu ◽  
G. Scaringi ◽  
B. A. Baudet ◽  
W. Han
Keyword(s):  
Fractal Dimension ◽  
Particle Shape ◽  
Carbonate Sand ◽  
Shape Factors ◽  
Shear Strains

Extending the use of particle sizing instrumentation to calculate particle shape factors

1986 ◽  
Vol 45 (2) ◽  
pp. 159-167 ◽  
Author(s):  
J.W. Novak ◽  
J.R. Thompson
Keyword(s):  
Particle Shape ◽  
Particle Sizing ◽  
Shape Factors
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