Towards a Model for Fresh Granular-Paste Systems Based on Discrete Element Method

2010 ◽  
Vol 452-453 ◽  
pp. 569-572 ◽  
Author(s):  
H. Hoornahad ◽  
Eddy A.B. Koenders ◽  
Klaas van Breugel
Keyword(s):  
Discrete Element Method ◽  
Particle System ◽  
Rheological Behaviour ◽  
Discrete Element ◽  
Experimental Results ◽  
Computational Techniques ◽  
Physical Parameters ◽  
Phase System ◽  
Research Approach ◽  
Element Method

Modelling the rheological behaviour of fresh granular-paste systems is the main aim of this study. The research approach is based on a conceptual idea where the paste-interaction system is explicitly modelled by an interactive two phase particle system. As a first approach the cohesive force-displacement interaction was measured for two ideally shaped glass particles bridged by water. Later on, the water was replaced by cement paste and the attraction force acting on the glass particles was measured for increasing inter-particle distances. The results gave a very good impression of the cohesive forces acting on a granular paste system employed by the cementations material in its fresh state. The Discrete Element Method (DEM) is one of the computational techniques that is applied to simulate the granular-paste system. With this method, the fresh granular-paste system is divided into two phases (aggregate/paste) and is modelled by a single-phase or a double-phase system of DEM elements. At the first step, the interaction forces of the particle-paste system are compared with the experimental results achieved from the particle-liquid measurements and expressed as an explicit function based on local geometrical and physical parameters. Modelling and experimental results show good agreement.

Simulation of the Slump Test Based on the Discrete Element Method (DEM)

2012 ◽  
Vol 446-449 ◽  
pp. 3766-3773
Author(s):  
Hooman Hoornahad ◽  
Eduard A. B. Koenders
Keyword(s):  
Discrete Element Method ◽  
Particle System ◽  
Rheological Behaviour ◽  
Discrete Element ◽  
Test Method ◽  
Research Approach ◽  
Slump Test ◽  
Laboratory Test Results ◽  
Wide Range ◽  
Element Method

The slump test is a very important industrial test for evaluation of workability of fresh granular-cement paste material, especially concrete. The test method is used as a generic tool for classification of a wide range of mixtures and can deal with a wide range of workabilities. The current paper presents a numerical approach, based on Discrete Element Method (DEM), with the aim to study the effect of the mix composition on the rheological behavior of a mixture after demolding, i.e. lifting the slump cone. The research approach is based on a conceptual idea, where the particle-paste interaction is explicitly modelled as an interactive two phase “paste –particle” system. Each mixture is considered to consist of these elements with the rheological behaviour characterized by the “excess paste” model. Simulations and experimental laboratory test results show good agreement.

Numerical simulation of particle screening efficiency of large multi-layer vibrating screen based on discrete element method

2021 ◽  
pp. 095440892110606
Author(s):  
Yujia Li ◽  
Peng Zhao ◽  
Li Mo ◽  
Tao Ren ◽  
Minghong Zhang
Keyword(s):  
Discrete Element Method ◽  
Environmental Protection ◽  
Inclination Angle ◽  
Discrete Element ◽  
Physical Parameters ◽  
Screening Process ◽  
Efficient Operation ◽  
Vibrating Screen ◽  
Screening Efficiency ◽  
Element Method

With the increasing requirements for energy conservation and environmental protection, multi-layer vibrating screens have become hot issues. Compared with single-layer vibrating screens, multi-layer vibrating screens has much better performance in terms of processing effect, treatment capacity, and environmental protection. The research on the physical parameters of the multi-layer vibrating screen is of great significance to the actual production. However, analysis and simulation studies of multi-layer vibrating screens are limited. In this paper, the screening process of wet particles on a multi-layer vibrating screen was simulated by using the discrete element method. The characteristics and application scope of the two vibration modes were analyzed. The particle penetration rate, the number of collisions, and the distribution of the particles under 23 combinations of structures and vibration parameters were investigated. The influence of different parameters on screening performance was analyzed. Several optimal combinations of frequency, amplitude and screen inclination angle under different working conditions were obtained. The screening efficiency of the balanced elliptic motion is higher than that of the linear motion. The best combination of the three parameters is 4 mm amplitude, 20 Hz frequency, and 3° inclination angle. The efficiency is higher when the particles follow a distribution of arithmetic on the screen. This study provides a reference for the efficient operation and optimal design of large multi-layer screening equipment.

The Granule Mechanic Model for Numerical Simulation of Coal Stream in Coal-Fired Power Plant

2010 ◽  
Vol 34-35 ◽  
pp. 1383-1387
Author(s):  
Hui Chun Peng ◽  
Qing He
Keyword(s):  
Numerical Simulation ◽  
Power Plant ◽  
Discrete Element Method ◽  
Particle System ◽  
Discrete Element ◽  
Mechanic Model ◽  
Contact Models ◽  
Element Method

In this paper, the contact models of particle system of coal stream are analyzed; the granule mechanic models of coal stream in different imposed conditions are summarized. Using 3d-discrete element method, a particle mechanic model of clumps is constructed by the contact bonding model to simulate the cataclasm phenomena during the coal conveying of Coal-fired power plant, which plays an important role in assuring the fidelity and integrality of 3D virtual coal conveying scene.

scholarly journals Optimization of Physical Parameters of Discrete Element Method for Blast Furnace and Its Application to the Analysis on Solid Motion around Raceway

2009 ◽  
Vol 49 (9) ◽  
pp. 1308-1315 ◽  
Author(s):  
Shungo Natsui ◽  
Shigeru Ueda ◽  
Masashi Oikawa ◽  
Zhengyun Fan ◽  
Junya Kano ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Discrete Element Method ◽  
Discrete Element ◽  
Physical Parameters ◽  
Solid Motion ◽  
Element Method

scholarly journals Coupling Simulation Algorithm of Discrete Element Method and Finite Element Method for Particle Damper

2009 ◽  
Vol 28 (3) ◽  
pp. 197-204 ◽  
Author(s):  
Zhaowang Xia ◽  
Xiandong Liu ◽  
Yingchun Shan ◽  
Xinghu Li
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Discrete Element Method ◽  
Particle Density ◽  
Discrete Element ◽  
Experimental Results ◽  
Theoretical Research ◽  
Simulation Algorithm ◽  
Cantilever Plate ◽  
Element Method

One advantage of the particle damper is that its property is independent of the surrounding temperature. This allows it to be used in harsh environments where traditional dampers fail. But current design of this damper mainly depends on experimental results because of a lack of theoretical research. In this paper, an investigation into particle dampers is performed analytically and experimentally. A coupling simulation algorithm based on the discrete element method and finite element method is presented. Comparison between the analytical and experimental results shows that simulation of the response of a cantilever plate with a particle damper is accurate. It is shown that the response of the cantilever plate depends on the mass-fill ratio and particle density of the particle damper.

scholarly journals Sensitivity Analysis of Physical Parameters in Discrete Element Method Compared with Blast Furnace Cold Model Experiments

2010 ◽  
Vol 96 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Shungo Natsui ◽  
Shigeru Ueda ◽  
Fan Zhengyun ◽  
Junya Kano ◽  
Ryo Inoue ◽  
...  
Keyword(s):  
Sensitivity Analysis ◽  
Blast Furnace ◽  
Discrete Element Method ◽  
Discrete Element ◽  
Physical Parameters ◽  
Cold Model ◽  
Model Experiments ◽  
Element Method

scholarly journals DEM examination of SPT correction factors

2021 ◽  
Vol 249 ◽  
pp. 14017
Author(s):  
Ningning Zhang ◽  
Marcos Arroyo ◽  
Matteo Ciantia ◽  
Antonio Gens
Keyword(s):  
Discrete Element Method ◽  
Dynamic Testing ◽  
Discrete Element ◽  
Standard Penetration Test ◽  
Experimental Results ◽  
Correction Factors ◽  
Penetration Test ◽  
Element Method

The Standard Penetration Test (SPT) is the most widely used method for dynamic testing of soils. The test is simple and robust but difficult to control and not fully standardized. As a result, experimental results typically show large variations and poor repeatability. To mitigate that correction factors such as energy normalization and rod length have been introduced in SPT practice. This study provides an examination of the two correction factors using models based on the discrete element method (DEM).

scholarly journals OPTIMIZATION RESEARCH OF FERTILIZER GUIDING MECHANISM BASED ON THE DISCRETE ELEMENT METHOD

2020 ◽  
Vol 60 (1) ◽  
pp. 275-286
Author(s):  
Hong Jian Zhang ◽  
Yu Feng Li ◽  
Chun Bao Xu ◽  
Shuang Xi Liu ◽  
Ze Kun Quan ◽  
...  
Keyword(s):  
Discrete Element Method ◽  
Discrete Element ◽  
Radius Of Curvature ◽  
Curvature Radius ◽  
Physical Parameters ◽  
Edge Region ◽  
Middle Region ◽  
Dispersion Coefficients ◽  
Double Row ◽  
Element Method

Discrete Element Method was used to study the fertilizer guiding mechanism of double-row orchard ditching fertilizer to solve certain problems, such as the low uniformity of fertilization in orchard. Firstly, on the basis of studying the existing B fertilizer guiding mechanism, A and C fertilizer guiding mechanisms were proposed, and three virtual simulation models of the fertilizer guiding mechanism were established. Secondly, the physical parameters of the fertilizer particles were analysed, combined with the dynamic analysis of the falling process of the fertilizer particles, the dynamic model of the fertilizer particles in the three fertilizer guiding mechanisms was established. Finally, three kinds of fertilizer guiding mechanisms A, B and C were analyzed by the discrete element simulation experiment, and the C fertilizer guiding mechanism was the best. Then, the C fertilizer guiding mechanisms under different curvature radius were simulated, the discrete coefficients of the edge region and the middle region were used to evaluate the fertilizer uniformity, and the optimal curvature radius of the C fertilizer guiding mechanism was obtained. The results of simulation and prototype orchard experiments show that the dispersion coefficients of the edge region and the middle region of the C fertilizer guiding mechanism are the smallest, the uniformity of fertilization is the highest, the A fertilizer guiding mechanism is the second, the B fertilizer guiding mechanism is the lowest; in the C fertilizer guiding mechanism under different radius of curvature, when the radius of curvature is 600mm, the dispersion coefficients of the edge region and the middle region of the C fertilizer guiding mechanism are the smallest, and the fertilization uniformity is the highest; after the optimization, the discrete coefficient is reduced from 0.51 to 0.26, and the fertilization uniformity is increased by 49.02%. This study has significant potential to design and processing of orchard ditching fertilizer applicator.

Sign in / Sign up

Export Citation Format

Share Document