Effect of particle size and shape on the order–disorder phase transition in diblock copolymers

2003 ◽  
Vol 119 (6) ◽  
pp. 3529-3534 ◽  
Author(s):  
Alexander I. Chervanyov ◽  
Anna C. Balazs
Keyword(s):  
Phase Transition ◽  
Particle Size ◽  
Diblock Copolymers ◽  
Disorder Phase Transition ◽  
Size And Shape ◽  
Effect Of Particle Size ◽  
Particle Size And Shape

Effect of Particle Size and Shape on Flowability of FGH96 Superalloy Powder

2021 ◽  
Vol 1035 ◽  
pp. 143-151
Author(s):  
Li Chong Zhang ◽  
Wen Yong Xu ◽  
Zhou Li ◽  
Liang Zheng ◽  
Yu Feng Liu ◽  
...  
Keyword(s):  
Particle Size ◽  
Fractal Dimension ◽  
Aspect Ratio ◽  
Shape Factors ◽  
Size And Shape ◽  
Median Diameter ◽  
Powder Flowability ◽  
Effect Of Particle Size ◽  
Particle Size And Shape ◽  
Superalloy Powder

The effect of particle size and shape on flowability of FGH96 superalloy powder was investigated by field emission scanning electron microscopy (FE-SEM), laser particle size analyzer (LPSA) and X-ray photoelectron spectroscopy (XPS). The results showed that the powder flowability basically presented a decreasing trend as the median diameter decreased. The Hall velocity of the five median diameter powders (50=203.9 μm, 106.3 μm, 83.2 μm, 73.8 μm, 19.9 μm) was 27.18 s/50g, 23.25 s/50g, 23.86 s/50g, 23.42 s/50g and none, respectively. The surface oxides/ hydroxide/nitride of the five median diameter powders were mostly the same, mainly including Al2O3, Cr2O3, MoO3, Nb2O5, Ni (OH)2, TiO2 and TiN. The median diameter 50, shape factors (circularity, aspect ratio, roundness, solidity) and fractal dimension were selected to quantitatively characterize particle size and shape. For the same fluctuation value of powder flowability, the roundness and solidity showed lower sensitivity. Compared with the two shape factors, the sensitivity of circularity and aspect ratio was at an intermediate level, while the median diameter and fractal dimension displayed higher sensitivity. The median diameter and fractal dimension can be used to characterize the principal variation of flowability. The circularity and aspect ratio can be utilized to characterize the variation of flowability supplementally.

Effect of Particle Size and Shape on Paint Consistency

1941 ◽  
Vol 33 (9) ◽  
pp. 1157-1164
Author(s):  
E. J. Dunn ◽  
Martin Kushner ◽  
C. H. Baier
Keyword(s):  
Particle Size ◽  
Size And Shape ◽  
Effect Of Particle Size ◽  
Particle Size And Shape

scholarly journals Effect of Particle Size and Shape on Separation in a Hydrocyclone

Water ◽  
2018 ◽  
Vol 11 (1) ◽  
pp. 16 ◽  
Author(s):  
Zhaojia Tang ◽  
Liming Yu ◽  
Fenghua Wang ◽  
Na Li ◽  
Liuhong Chang ◽  
...  
Keyword(s):  
Particle Size ◽  
Test Methods ◽  
Spherical Particles ◽  
Separation Mechanism ◽  
Upward Flow ◽  
Projected Area ◽  
Separation Effect ◽  
Size And Shape ◽  
Effect Of Particle Size ◽  
Particle Size And Shape

Given the complex separation mechanisms of the particulate mixture in a hydrocyclone and the uncertain effects of particle size and shape on separation, this study explored the influence of the maximum projected area of particles on the separation effect as well as single and mixed separations based on CFD–DEM (Computational Fluid Dynamics and Discrete Element Method) coupling and experimental test methods. The results showed that spherical particles flowed out more easily from the downstream as their sizes increased. Furthermore, with the enlargement of maximum projected area, the running space of the particles with the same volume got closer to the upward flow and particles tended to be separated from the upstream. The axial velocity of the combined separation of 60 µm particles and 120 µm particles increased by 25.74% compared with that of single separation of 60 µm particles near the transition section from a cylinder to a cone. The concentration of 60 µm particles near the running space of 120 µm particles increased by 20.73% and those separated from the downstream increased by 4.1%. This study showed the influence of particle size and maximum projected area on the separation effect and the separation mechanism of mixed sand particles in a hydrocyclone, thereby providing a theoretical basis for later studies on the effect of particle size and shape on sedimentation under the cyclone action in a hydrocyclone.

Sign in / Sign up

Export Citation Format

Share Document