Experimental study on the angle of repose of pulverized coal

Wang, Wei; Zhang, Jiansheng; Shen, Yang; Zhang, Hai; Yang, Hairui; Yue, Guangxin

doi:10.1016/j.partic.2010.07.008

Cited by 72 publications

(47 citation statements)

References 11 publications

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“…Such a dependence was also shown for other granular materials like glass beads (size range from 20 to 170 μm) by Wong [11], for a flame retardant filler (d 32 from 6 to 63 μm) by Geldart et al [4,12] or for pulverized coal (size range from 12.5 to 137.5 μm) by Wang et al [13]. For all materials tested, the value of the angle of repose was higher for materials with a smaller particle size.…”

Section: Introductionsupporting

confidence: 61%

Dusts from dry off-gas cleaning: comparison of flowability determined by angle of repose and with shear cells

Lanzerstorfer

2017

Granular Matter

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The flowability of the dust separated in dry offgas cleaning systems is an important characteristic for the design of dust storage and conveying equipment. The angle of repose is often used as an indicator for the flowability of granular material. In this study the results for the flowability obtained from the angle of repose and by the ratio of the consolidation stress to the unconfined yield strength were compared for 77 dusts from various dry off-gas cleaning systems. For dust with a Sauter mean diameter of >5 μm the flowability indicated by the angle of repose and the results of a shear test performed at a low pre-shear load correlated reasonably. For dusts with a smaller particle size such a correlation did not exist. The values of the angle of repose were scattered with no relation to the results of the shear test. The dependence of the angle of repose on the d 32 described in the literature was confirmed for the coarser dusts only. For dusts with a smaller particle size such a relationship does not exist. For very fine dusts the angle of repose was even smaller. This effect was attributed to the visible small agglomerates formed during the angle of repose measurement. These agglomerates rolling down the slope prevented the formation of a steeper cone which limits the angle of repose.

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Section: Introductionsupporting

confidence: 61%

Dusts from dry off-gas cleaning: comparison of flowability determined by angle of repose and with shear cells

Lanzerstorfer

2017

Granular Matter

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“…The effect of particle size on angle of repose is mainly due to the balance between interparticle forces and interaction forces. When particles are small, the interparticle force will play the dominant role on angle of repose, and therefore the particles will be considered as a cohesive group [22]. When the particle size is large enough, the interparticle force no longer plays a dominant role in angle of repose so that the particles behave as individual ones [22].…”

Section: Angle Of Reposementioning

confidence: 99%

“…When particles are small, the interparticle force will play the dominant role on angle of repose, and therefore the particles will be considered as a cohesive group [22]. When the particle size is large enough, the interparticle force no longer plays a dominant role in angle of repose so that the particles behave as individual ones [22]. In addition, the shapes of coarser particles are more irregular than that of fine particles so that the friction coefficient of coarse particle is higher, resulting in high potential to form the sand pile.…”

Section: Angle Of Reposementioning

confidence: 99%

“…It is closely related to 2 Advances in Materials Science and Engineering many phenomena, including packing [15,16], avalanching [17,18], and segregation and stratification [19][20][21], and it is therefore a research focus in recent years. The angle of repose, as a basic characteristic of granular materials in nature, has been indicated varying from 25 ∘ for smooth particles to 45 ∘ for irregular particles [9,22,23]. Currently, The literature reported that angle of repose was closely related to physical properties of granular materials such as particle shape and size [24][25][26][27][28][29][30] and materials properties such as shear modulus and particle moisture content and friction coefficients [12,[31][32][33].…”

Section: Introductionmentioning

confidence: 99%

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Effect of the Lifting Velocity and Container Shape on Angle of Repose of Iron Ore Particles

Peng

Zhu

et al. 2017

Advances in Materials Science and Engineering

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To investigate the impact of lifting velocity and container shape on angle of repose, the fixed-base cylinder method was performed using three types of container shape. The container shape was lifted a series of lifting velocities. Six size fractions of iron ore particles ranging from coarser to fine particles were used as the test materials. And the sand-pile calibration method was then used to calibrate the contact parameters of iron ore particles. Results show angle of repose decreased exponentially with the lifting velocity, while it appeared approximately to be invariant to particle shape, for all size fractions. The sand pile highly depends on the container shape at a low lifting velocity but appears to be invariant to particle size for a high lifting velocity. And then a predictive equation is established and a very close agreement between the predicted and measured angle of repose is attained. Finally, a series of DEM simulations considering the irregular particle shape are conducted by means of sphere clump method to calibrate the contact parameters and are in good visual agreement with the experimental results, indicating the "tuned" contact parameters as well as the applicability of the predicted equation.

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“…Nakashima et al (2011) concluded, using the two-dimensional discrete element method (DEM), that the angle of repose is greatly influenced by the friction coefficient and rolling friction values, but the impact of elemental radius and gravity is very small. More related studies can be found in Zhou et al 2002;Liu et al 2005 andWang et al 2010. Although much has been done on the topic of the repose angle, there is comparatively little research on the angle under the submarine pipeline.…”

Section: Introductionmentioning

confidence: 99%

Study on dynamic angle of repose for submarine pipeline with spoiler on sandy seabed

Liu

Shi

Guo

2012

J Petrol Explor Prod Technol

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This paper investigates the dynamic angle of repose underneath the submarine pipeline. A series of tests are carried out to explore the bottom velocity in the scour hole for the case of with spoiler, and gap-ratio in unidirectional current. On that basis, the formulas of dynamic angle of repose in the scour hole are proposed using a sand deposition model. The formulas consider the bottom velocity (which is mainly influenced by the spoiler height and gap-ratio) that dominates the angle of repose. The calculation results are verified by the test data and a good agreement is obtained.

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Experimental study on the angle of repose of pulverized coal

Cited by 72 publications

References 11 publications

Dusts from dry off-gas cleaning: comparison of flowability determined by angle of repose and with shear cells

Dusts from dry off-gas cleaning: comparison of flowability determined by angle of repose and with shear cells

Effect of the Lifting Velocity and Container Shape on Angle of Repose of Iron Ore Particles

Study on dynamic angle of repose for submarine pipeline with spoiler on sandy seabed

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