Finite element analysis of the rolling friction of a viscous particle on a rigid plane

Zheng, Qijun; Zhu, Haiping; Yu, Aibing

doi:10.1016/j.powtec.2010.11.026

Cited by 50 publications

(20 citation statements)

References 41 publications

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“…The torque acting on particle i due to particle j includes two components: Tt,ij which is generated by the tangential force and causes particle i to rotate; and Tr,ij which, commonly known as the rolling friction torque, is generated by the asymmetric normal contact forces and slows down the relative rotation between contacting particles. 14) If particle i undergoes multiple interactions, the individual interaction forces and torques are summed up for all particles interacting with particle i. Most of the equations for determining the flows and torques have been well established as, for example, reviewed by Zhu et al 15) The equations used for the present work are the same as those used in the previous work, 16,17) as given in Table 1.…”

Section: Model Descriptionmentioning

confidence: 99%

Modeling the Gas-solid Flow in the Reduction Shaft of COREX

Hou

Samman

et al. 2014

ISIJ Int.

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COREX is a promising alternative to blast furnace ironmaking. It includes two main reactors: a reduction shaft (RS) for the direct reduction of iron ore and a melter gasifier for the melting reduction of directly reduced iron. This work uses a two-dimensional slot model to investigate the gas-solid flow in the RS by a combined computational fluid dynamics and discrete element method approach. The three-dimensional flow of cohesive solids is then examined for three RS designs by the discrete element method. The effects of gas flow, the stickiness between particles, the rotational speed of screws, and different designs are depicted in terms of gas-solid flow pattern, overall bed pressure drop and solid flowrate. The results show that the effect of gas flow is insignificant on gas-solid flow pattern due to the small gas-solid interaction forces under the considered conditions. Solid flow varies in a complex manner with the rotational speed of screws and the sticking force, and a correlation is formulated for predicting the solid flowrate based on the simulated results. It is also shown that the effect of geometrical design on solid flow is complicated and significant. Caution should be taken for any changes in the design. The findings should be useful for the design, control and optimization of the RS operation.

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Section: Model Descriptionmentioning

confidence: 99%

Modeling the Gas-solid Flow in the Reduction Shaft of COREX

Hou

Samman

et al. 2014

ISIJ Int.

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“…The results for strain ߝ can be found elsewhere [10,11]; thus, the viscous stress can be obtained as…”

Section: Normal Forcementioning

confidence: 99%

“…Since the results of ߝ ௫௫ ǡ ߝ ௬௬ ǡ ߝ ௭௭ are already known [10,11], one can directly obtain the following equation for rolling friction [10] ‫ܯ‬ ൌ ‫ܨܴ߱ܣ‬…”

Section: Rolling Frictionmentioning

confidence: 99%

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Finite element analysis of the contact forces between viscoelastic particles

Zheng¹,

Zhu²,

Yu³

2013

AIP Conference Proceedings

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Abstract. The normal and tangential force-displacement (NFD and TFD) relations as well as the rolling friction between viscoelastic particles are investigated by means of finite element method (FEM). A new set of semi-theoretical models are proposed for the NFD, TFD and rolling friction based on the contact mechanics and the FEM results. Compared with previous empirical models (e.g. Linear-Spring-Dashpot model), the new models have an advantage that all parameters can be directly determined from the material properties. Therefore they can eliminate the uncertainty in parameter selection and should be more effective in discrete element method (DEM) simulations of viscoelastic granular materials.

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“…A primeira é a dissipação de energia na interface de contato de duas partículas, devido ao microdeslizamento e fricção, irregularidades de superfície, adesão molecular, ou outras propriedades de superfície. Neste mecanismo, a energia cinética de uma partícula é dissipada, resultando na desaceleração da velocidade de rolamento da partícula, que é um fenômeno usual de atrito (ZHENG et al, 2011).…”

Section: Coeficiente De Atrito De Rolamentounclassified

Estudo da segregação de material granular em tambor rotatório empregando a abordagem numérica Lagrangeana

Brandao¹

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Finite element analysis of the rolling friction of a viscous particle on a rigid plane

Cited by 50 publications

References 41 publications

Modeling the Gas-solid Flow in the Reduction Shaft of COREX

Modeling the Gas-solid Flow in the Reduction Shaft of COREX

Finite element analysis of the contact forces between viscoelastic particles

Estudo da segregação de material granular em tambor rotatório empregando a abordagem numérica Lagrangeana

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