Mixing uniformity of irregular sand and gravel materials in a rotating drum with determination of contact model parameters

Jiang, Shengqiang; Ye, Yixuan; He, Mingxue; Chun-yan, Duan; Liu, Sisi; Liu, Jingang; Xiao, Xin; Zhang, Hao; Tan, Yuanqiang

doi:10.1016/j.powtec.2019.06.005

Cited by 26 publications

(9 citation statements)

References 44 publications

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“…The regulation is automatic and continuous by in-mixer analysis of the sand during mixing [39]. Jiang et al, [3] analyzed the significance of the gravel filling degree, the drum rotational speed, number of lifters and drum diameter selected as the influencing mixing factors in the rotating drum (rotary kiln and ball mill) being widely used in food processing, smelting, cement, pharmaceuticals and other related industries [3,4,40,41]. Wu and Saxena, [42] studied the mixing of light paper pellets in a sand fluidized bed at varying paper pellets proportions (0-20 mass%) over a range of air velocities (0-1.5 m/s) at surface and ambient conditions.…”

Section: Applications To Metal Casting Industries and Fuels In Combustion Enginesmentioning

confidence: 99%

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Design and Fabrication of a Multi-Purpose Homogenizer

O.O¹,

O.F²,

Omoyeni³

et al. 2020

NIPES

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The homogenizer is vital equipment in numerous production sectors such as in food processing, animal feed processing, chemical and pharmaceutical industries, waste recycling and mineral and allied industries. In this work, a multi-purpose homogenizer suitable for the mixing of different materials (animal and fish feeds, coal fuel, foundry sand etc) was designed; fabricated and the performance of the machine evaluated. The cost is about #

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Section: Applications To Metal Casting Industries and Fuels In Combustion Enginesmentioning

confidence: 99%

“…The use of homogenizer is indispensable in the solid-solid mixing of particles for agro processing, food processing, pharmaceutical, and metallurgical industries [1][2][3][4][5]. The design and fabrication of mixers are based on standard scientific theories and principles available in literature .…”

Section: Introductionmentioning

confidence: 99%

Design and Fabrication of a Multi-Purpose Homogenizer

O.O¹,

O.F²,

Omoyeni³

et al. 2020

NIPES

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“…In the past decades, modeling and numerical simulation have been used to provide a detailed insight and quantitative guidelines for reactor design and optimization. However, existing work for rotary kilns focuses on the flow field [7][8][9], mixing/segregation [10][11][12][13], and heat transfer performance [6,14,15]; simulation of chemical processes in a rotary kiln is still in its infancy due to the complexity of coupling of dense gas-solid flow, heat transfer, and reactions [16]. There are only few modeling researches concerning the reacting flow for rotary kilns, which can be categorized two types.…”

Section: Mathematical Problems In Engineeringmentioning

confidence: 99%

Modeling of Oxidation Process of Coal Tar Pitch in Rotating Kilns

Xie

Wang

Shao

et al. 2019

Mathematical Problems in Engineering

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In this paper, a three-dimensional numerical model has been developed to study the process of oxidative weight increment of coal tar pitch in a rotating kiln. Based on the two-fluid method, the gas phase is modeled by realizable k-turbulent model and the solid phase is modeled by kinetic theory of granular flow. The dense gas-solid flow, heat transfer, and oxidation reaction for the bed and freeboard regions are simultaneously solved. The model is applied to a rotating kiln with a cylinder of 0.75 m length and 0.4 m diameter in the front and circular truncated cone on exit side. The detailed verification of model is firstly performed by comparisons with the available experimental data. The particle velocity profiles, product gas compositions, and various forms of solid motion in rotary kilns are contrastively analyzed. Afterwards, simulations are carried out to obtain the primary hydrodynamic and reactive characteristics in the rotary kiln. At the steady state, the particle velocity peak is located at the active layer surface, while the velocity has the opposite direction in the passive layer. The bed region generally has a higher temperature than the freeboard due to the large thermal capacity. The concentrations of product gas compositions, such as CO 2 , CO, and CH 4 , and solid product of oxidation, increase sharply near the surface and then keep on the steady values inside the bed. The effects of rotational speed of the rotary kiln and flow rate of air are also studied. The increasing rotational speed significantly accelerates the particle movement of the active layer and raises the final oxidative yield of coal pitch spheres. By contrast, increasing the flow rate of air has little effect on the particle motion and oxidation yield of coal pitch.

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“…In order to be close to the actual situation, the particle size of the simulation experiment in this paper is set as 20 to 100 μm. e common AOR model includes the cylinder model, the funnel model, and L-box model [29]. In this paper, the cylinder model is used to study the AOR of nylon PA3200 powder.…”

Section: Parameter Calibration Of Nylon Pa3200 Powder Contactmentioning

confidence: 99%

Discrete Element Simulation of Factors Affecting the Fluidity of Nylon Powder

Jiang

Chun-yan

et al. 2019

Mathematical Problems in Engineering

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Powder fluidity is one of the important factors affecting the smoothness of selective laser sintered parts and the mechanical properties of sintered parts. In this paper, the angle of repose (AOR) and angle of internal friction of nylon PA3200 powder were measured by a powder comprehensive tester and a direct shear tester to evaluate the flow properties of the powder particles. Based on the discrete element method (DEM), the rolling resistance contact model and the van der Waals force model were used to describe the interaction forces between the powder particles. The rolling resistance coefficient and friction coefficient within the contact model were calibrated by the results of the AOR experiments. Based on the orthogonal experimental method, the particle size and particle size distribution (PSD) (such as uniform distribution and Gaussian distribution) were selected as the influencing factors, and the effect of particle size and PSD on the fluidity of nylon PA3200 powder was studied by numerical simulation. The results show that the PSD has a stronger influence on the AOR than particle size, and the fluidity of uniform distribution is better than that of the Gaussian distribution.

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Mixing uniformity of irregular sand and gravel materials in a rotating drum with determination of contact model parameters

Cited by 26 publications

References 44 publications

Design and Fabrication of a Multi-Purpose Homogenizer

Design and Fabrication of a Multi-Purpose Homogenizer

Modeling of Oxidation Process of Coal Tar Pitch in Rotating Kilns

Discrete Element Simulation of Factors Affecting the Fluidity of Nylon Powder

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