The Experts below are selected from a list of 10488 Experts worldwide ranked by ideXlab platform
Ir. Ilse M. F. Wouters - One of the best experts on this subject based on the ideXlab platform.
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characterising semi cohesive powders using Angle of Repose
Particle & Particle Systems Characterization, 1996Co-Authors: Ir. Ilse M. F. Wouters, D GeldartAbstract:When properly measured and interpreted Angle of Repose (AOR) can be a useful method of characterising a powder. Unfortunately, a multitude of definitions and measuring equipment is used. A review of the inherent problems is presented in the first part of this paper. The second part of the paper describes the improvements made to a measuring device developed originally for measuring the Angle of Repose of soda ash, so that a wider range of powders can be tested. In the improved design, the tendency of cohesive and semi-cohesive powders to block the device's funnel has been eliminated. A total of 73 powders consisting of four different materials, and covering Groups A, A/C and C of Geldart's classification, have been tested using the new equipment. The results show that AOR increases systematically with decrease in mean particle size. Combination of AOR measured in the new device with aerated bulk density provides a quick, sensitive and effective method for characterising a wide range of powders.
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Characterising Semi‐Cohesive Powders using Angle of Repose
Particle & Particle Systems Characterization, 1996Co-Authors: Ir. Ilse M. F. Wouters, Derek GeldartAbstract:When properly measured and interpreted Angle of Repose (AOR) can be a useful method of characterising a powder. Unfortunately, a multitude of definitions and measuring equipment is used. A review of the inherent problems is presented in the first part of this paper. The second part of the paper describes the improvements made to a measuring device developed originally for measuring the Angle of Repose of soda ash, so that a wider range of powders can be tested. In the improved design, the tendency of cohesive and semi-cohesive powders to block the device's funnel has been eliminated. A total of 73 powders consisting of four different materials, and covering Groups A, A/C and C of Geldart's classification, have been tested using the new equipment. The results show that AOR increases systematically with decrease in mean particle size. Combination of AOR measured in the new device with aerated bulk density provides a quick, sensitive and effective method for characterising a wide range of powders.
Derek Geldart - One of the best experts on this subject based on the ideXlab platform.
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CHARACTERIZATION of POWDER FLOWABILITY USING MEASUREMENT of Angle of Repose
China Particuology, 2006Co-Authors: Derek Geldart, Ali Hassanpour, L.c. Nwoke, Ezzat Chan Abdullah, I. WoutersAbstract:In response to the need in industry for a quick and reproducible method of measuring the flowability of powders in processes involving transport and storage, the apparently simple idea of measuring Angle of Repose has been revived. The simple tester first used has evolved over a number of years into the present version which is shown to be capable of handling quite small samples of powders that are even slightly cohesive. Experimental data are presented and results shown to compare consistently with the better known Hausner ratio.
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Characterising Semi‐Cohesive Powders using Angle of Repose
Particle & Particle Systems Characterization, 1996Co-Authors: Ir. Ilse M. F. Wouters, Derek GeldartAbstract:When properly measured and interpreted Angle of Repose (AOR) can be a useful method of characterising a powder. Unfortunately, a multitude of definitions and measuring equipment is used. A review of the inherent problems is presented in the first part of this paper. The second part of the paper describes the improvements made to a measuring device developed originally for measuring the Angle of Repose of soda ash, so that a wider range of powders can be tested. In the improved design, the tendency of cohesive and semi-cohesive powders to block the device's funnel has been eliminated. A total of 73 powders consisting of four different materials, and covering Groups A, A/C and C of Geldart's classification, have been tested using the new equipment. The results show that AOR increases systematically with decrease in mean particle size. Combination of AOR measured in the new device with aerated bulk density provides a quick, sensitive and effective method for characterising a wide range of powders.
D Geldart - One of the best experts on this subject based on the ideXlab platform.
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characterising semi cohesive powders using Angle of Repose
Particle & Particle Systems Characterization, 1996Co-Authors: Ir. Ilse M. F. Wouters, D GeldartAbstract:When properly measured and interpreted Angle of Repose (AOR) can be a useful method of characterising a powder. Unfortunately, a multitude of definitions and measuring equipment is used. A review of the inherent problems is presented in the first part of this paper. The second part of the paper describes the improvements made to a measuring device developed originally for measuring the Angle of Repose of soda ash, so that a wider range of powders can be tested. In the improved design, the tendency of cohesive and semi-cohesive powders to block the device's funnel has been eliminated. A total of 73 powders consisting of four different materials, and covering Groups A, A/C and C of Geldart's classification, have been tested using the new equipment. The results show that AOR increases systematically with decrease in mean particle size. Combination of AOR measured in the new device with aerated bulk density provides a quick, sensitive and effective method for characterising a wide range of powders.
Hamed Maleki - One of the best experts on this subject based on the ideXlab platform.
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The Angle of Repose of spherical grains in granular Hele–Shaw cells: a molecular dynamics study
Journal of Statistical Mechanics: Theory and Experiment, 2008Co-Authors: Hamed Maleki, Fatemeh Ebrahimi, Ehsan Nedaaee OskoeeAbstract:We report the results of three-dimensional molecular dynamic simulations on the Angle of Repose of a sandpile formed by pouring mono-sized cohesionless spherical grains into a granular Hele–Shaw cell. In particular, we are interested in investigating the effects of those variables which may have a significant impact on the pattern formation of granular mixtures in Hele–Shaw cells. The results indicate that the frictional forces influence the formation of piles on the grain level remarkably. Furthermore, we see that increasing grain insertion rate decreases the Angle of Repose slightly. We also find that the cell thickness is a significant factor and the Angle of Repose decays when the size of the gap between the lateral walls increases. In addition to agreeing with the experimental exponential decay law, our results are in accordance with a recently proposed model which takes into account the arching effects. Using grains with different sizes reveals that the behaviour of the Angle of Repose when both size and cell thickness are varied is controlled by a scaled function of the ratio of these two variables.
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the Angle of Repose of spherical grains in granular hele shaw cells a molecular dynamics study
Journal of Statistical Mechanics: Theory and Experiment, 2008Co-Authors: Hamed Maleki, Fatemeh Ebrahimi, Ehsan Nedaaee OskoeeAbstract:We report the results of three-dimensional molecular dynamic simulations on the Angle of Repose of a sandpile formed by pouring mono-sized cohesionless spherical grains into a granular Hele–Shaw cell. In particular, we are interested in investigating the effects of those variables which may have a significant impact on the pattern formation of granular mixtures in Hele–Shaw cells. The results indicate that the frictional forces influence the formation of piles on the grain level remarkably. Furthermore, we see that increasing grain insertion rate decreases the Angle of Repose slightly. We also find that the cell thickness is a significant factor and the Angle of Repose decays when the size of the gap between the lateral walls increases. In addition to agreeing with the experimental exponential decay law, our results are in accordance with a recently proposed model which takes into account the arching effects. Using grains with different sizes reveals that the behaviour of the Angle of Repose when both size and cell thickness are varied is controlled by a scaled function of the ratio of these two variables.
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the Angle of Repose of spherical grains in granular hele shaw cells a molecular dynamics study
arXiv: Statistical Mechanics, 2007Co-Authors: Hamed Maleki, Fatemeh Ebrahimi, Ehsan Nedaaee OskoeeAbstract:We report the results of three dimensional molecular dynamic simulations on the Angle of Repose of a sandpile formed by pouring mono-sized cohesionless spherical grains into a granular Hele-Shaw cell. In particular, we are interested to investigate the effects of those variables which may impact significantly on pattern formation of granular mixtures in Hele-Shaw cells. The results indicate that the frictional forces influence remarkably the formation of pile on the grain level. Furthermore, We see that increasing grain insertion rate decreases slightly the Angle of Repose. We also find that in accordance with experimental results, the cell thickness is another significant factor and the Angle of Repose decays exponentially by increasing the cell thickness. It is shown that this effect can be interpreted as a cross-over from two to three dimensions. In fact, using grains with different sizes shows that the behaviour of the Angle of Repose when both size and cell thickness are varied is controlled by a scaled function of the ratio of these two variables.
Ehsan Nedaaee Oskoee - One of the best experts on this subject based on the ideXlab platform.
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The Angle of Repose of spherical grains in granular Hele–Shaw cells: a molecular dynamics study
Journal of Statistical Mechanics: Theory and Experiment, 2008Co-Authors: Hamed Maleki, Fatemeh Ebrahimi, Ehsan Nedaaee OskoeeAbstract:We report the results of three-dimensional molecular dynamic simulations on the Angle of Repose of a sandpile formed by pouring mono-sized cohesionless spherical grains into a granular Hele–Shaw cell. In particular, we are interested in investigating the effects of those variables which may have a significant impact on the pattern formation of granular mixtures in Hele–Shaw cells. The results indicate that the frictional forces influence the formation of piles on the grain level remarkably. Furthermore, we see that increasing grain insertion rate decreases the Angle of Repose slightly. We also find that the cell thickness is a significant factor and the Angle of Repose decays when the size of the gap between the lateral walls increases. In addition to agreeing with the experimental exponential decay law, our results are in accordance with a recently proposed model which takes into account the arching effects. Using grains with different sizes reveals that the behaviour of the Angle of Repose when both size and cell thickness are varied is controlled by a scaled function of the ratio of these two variables.
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the Angle of Repose of spherical grains in granular hele shaw cells a molecular dynamics study
Journal of Statistical Mechanics: Theory and Experiment, 2008Co-Authors: Hamed Maleki, Fatemeh Ebrahimi, Ehsan Nedaaee OskoeeAbstract:We report the results of three-dimensional molecular dynamic simulations on the Angle of Repose of a sandpile formed by pouring mono-sized cohesionless spherical grains into a granular Hele–Shaw cell. In particular, we are interested in investigating the effects of those variables which may have a significant impact on the pattern formation of granular mixtures in Hele–Shaw cells. The results indicate that the frictional forces influence the formation of piles on the grain level remarkably. Furthermore, we see that increasing grain insertion rate decreases the Angle of Repose slightly. We also find that the cell thickness is a significant factor and the Angle of Repose decays when the size of the gap between the lateral walls increases. In addition to agreeing with the experimental exponential decay law, our results are in accordance with a recently proposed model which takes into account the arching effects. Using grains with different sizes reveals that the behaviour of the Angle of Repose when both size and cell thickness are varied is controlled by a scaled function of the ratio of these two variables.
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the Angle of Repose of spherical grains in granular hele shaw cells a molecular dynamics study
arXiv: Statistical Mechanics, 2007Co-Authors: Hamed Maleki, Fatemeh Ebrahimi, Ehsan Nedaaee OskoeeAbstract:We report the results of three dimensional molecular dynamic simulations on the Angle of Repose of a sandpile formed by pouring mono-sized cohesionless spherical grains into a granular Hele-Shaw cell. In particular, we are interested to investigate the effects of those variables which may impact significantly on pattern formation of granular mixtures in Hele-Shaw cells. The results indicate that the frictional forces influence remarkably the formation of pile on the grain level. Furthermore, We see that increasing grain insertion rate decreases slightly the Angle of Repose. We also find that in accordance with experimental results, the cell thickness is another significant factor and the Angle of Repose decays exponentially by increasing the cell thickness. It is shown that this effect can be interpreted as a cross-over from two to three dimensions. In fact, using grains with different sizes shows that the behaviour of the Angle of Repose when both size and cell thickness are varied is controlled by a scaled function of the ratio of these two variables.
