Flow characteristics and discharge rate of ellipsoidal particles in a flat bottom hopper

S. D. Liu, Z. Y. Zhou, R. P. Zou, D. Pinson, A. B. Yu

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Hopper flow characteristics are significantly affected by particle shape. In this work, ellipsoidal particles which can represent a large number of shapes are used to investigate the shape effect on granular flow in a cylindrical hopper. Numerical experiments are conducted by use of the discrete element method, with its validity verified by comparison with the results from physical experiments. The results indicate that particle shape can make a significant effect on the flow pattern. In particular, the increase of deviation from spheres can decrease the mixed region adjacent to the side wall, and increase the stagnant zone at the bottom corner. It may also lead to decreased wall stress. Furthermore, particle shape has a significant effect on the discharge rate. Spheres of unity aspect ratio have the highest flow rate, and the lower or higher aspect ratio, the smaller the flow rate. Based on the numerical results, the Beverloo equation is modified, where parameters C and k in the equation are respectively formulated as a function of aspect ratio.
Original languageEnglish
Pages (from-to)70 - 79
Number of pages10
JournalPowder Technology
Volume253
DOIs
Publication statusPublished - 2014
Externally publishedYes

Cite this

@article{2826c5947f6c4e2aa34a924c9aa2834d,
title = "Flow characteristics and discharge rate of ellipsoidal particles in a flat bottom hopper",
abstract = "Hopper flow characteristics are significantly affected by particle shape. In this work, ellipsoidal particles which can represent a large number of shapes are used to investigate the shape effect on granular flow in a cylindrical hopper. Numerical experiments are conducted by use of the discrete element method, with its validity verified by comparison with the results from physical experiments. The results indicate that particle shape can make a significant effect on the flow pattern. In particular, the increase of deviation from spheres can decrease the mixed region adjacent to the side wall, and increase the stagnant zone at the bottom corner. It may also lead to decreased wall stress. Furthermore, particle shape has a significant effect on the discharge rate. Spheres of unity aspect ratio have the highest flow rate, and the lower or higher aspect ratio, the smaller the flow rate. Based on the numerical results, the Beverloo equation is modified, where parameters C and k in the equation are respectively formulated as a function of aspect ratio.",
author = "Liu, {S. D.} and Zhou, {Z. Y.} and Zou, {R. P.} and D. Pinson and Yu, {A. B.}",
year = "2014",
doi = "10.1016/j.powtec.2013.11.001",
language = "English",
volume = "253",
pages = "70 -- 79",
journal = "Powder Technology",
issn = "0032-5910",
publisher = "Elsevier",

}

Flow characteristics and discharge rate of ellipsoidal particles in a flat bottom hopper. / Liu, S. D.; Zhou, Z. Y.; Zou, R. P.; Pinson, D.; Yu, A. B.

In: Powder Technology, Vol. 253, 2014, p. 70 - 79.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Flow characteristics and discharge rate of ellipsoidal particles in a flat bottom hopper

AU - Liu, S. D.

AU - Zhou, Z. Y.

AU - Zou, R. P.

AU - Pinson, D.

AU - Yu, A. B.

PY - 2014

Y1 - 2014

N2 - Hopper flow characteristics are significantly affected by particle shape. In this work, ellipsoidal particles which can represent a large number of shapes are used to investigate the shape effect on granular flow in a cylindrical hopper. Numerical experiments are conducted by use of the discrete element method, with its validity verified by comparison with the results from physical experiments. The results indicate that particle shape can make a significant effect on the flow pattern. In particular, the increase of deviation from spheres can decrease the mixed region adjacent to the side wall, and increase the stagnant zone at the bottom corner. It may also lead to decreased wall stress. Furthermore, particle shape has a significant effect on the discharge rate. Spheres of unity aspect ratio have the highest flow rate, and the lower or higher aspect ratio, the smaller the flow rate. Based on the numerical results, the Beverloo equation is modified, where parameters C and k in the equation are respectively formulated as a function of aspect ratio.

AB - Hopper flow characteristics are significantly affected by particle shape. In this work, ellipsoidal particles which can represent a large number of shapes are used to investigate the shape effect on granular flow in a cylindrical hopper. Numerical experiments are conducted by use of the discrete element method, with its validity verified by comparison with the results from physical experiments. The results indicate that particle shape can make a significant effect on the flow pattern. In particular, the increase of deviation from spheres can decrease the mixed region adjacent to the side wall, and increase the stagnant zone at the bottom corner. It may also lead to decreased wall stress. Furthermore, particle shape has a significant effect on the discharge rate. Spheres of unity aspect ratio have the highest flow rate, and the lower or higher aspect ratio, the smaller the flow rate. Based on the numerical results, the Beverloo equation is modified, where parameters C and k in the equation are respectively formulated as a function of aspect ratio.

U2 - 10.1016/j.powtec.2013.11.001

DO - 10.1016/j.powtec.2013.11.001

M3 - Article

VL - 253

SP - 70

EP - 79

JO - Powder Technology

JF - Powder Technology

SN - 0032-5910

ER -