scholarly journals Modeling of Transport of Loose Products with the Use of the Non-Grid Method of Discrete Elements (DEM)

Processes ◽  
2020 ◽  
Vol 8 (11) ◽  
pp. 1489 ◽  
Author(s):  
Dariusz Kryszak ◽  
Adrian Bartoszewicz ◽  
Szymon Szufa ◽  
Piotr Piersa ◽  
Andrzej Obraniak ◽  
...  
Keyword(s):  
Food Industry ◽  
Bulk Material ◽  
Grid Method ◽  
Calculation Model ◽  
Structural Elements ◽  
Discrete Elements ◽  
Tangential Forces ◽  
Soft Fruit ◽  
Discrete Elements Method ◽  
Transport Device

The application of the Discrete Element Method (DEM) allows simulating the movement of a particle of any shape in a conveyor. The DEM method uses the assumptions of the Lagrange calculation model, in which each particle in the domain is tracked individually. It makes it possible to conduct a thorough examination of the behavior of the entire bulk material bed consisting of a set of elements with characteristic physicochemical properties. Therefore, the deposit is not considered according to averages and constants, e.g., strength values, but as a set of elements that can be described individually. The article presents the results of a simulation, with the use of the Discrete Elements Method (DEM), of the process of soft fruit transport in the food industry. The results of the research and exemplary simulations of blueberry fruit transport are presented. The influence of the type of a transport device on the values of normal and tangential forces occurring between the blueberry fruit and structural elements of the transport device, as well as the interaction between the fruits, were modeled. In addition, based on the amount of energy absorbed by each fruit due to collisions, the analysis of the energy spectrum of collisions of particles was carried out to determine the likelihood of damage to the fruit in transport and to identify the phenomena that favor it.

scholarly journals Investigation of interaction of particles of pollution and gas bulb in flotation of wastewater waters

2019 ◽  
Vol 135 ◽  
pp. 01032
Author(s):  
Elena Nazimko ◽  
Sergei Malko ◽  
Anna Semenova ◽  
Vladimir Dorovskoy
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Hydrophobic Surface ◽  
Small Scale ◽  
Discrete Elements ◽  
Chemical Factors ◽  
Flotation Method ◽  
Physical And Chemical ◽  
Kinetics Of ◽  
Discrete Elements Method

The interaction of phases is at the basis of many technologies in different industries. Flotation method is used in wastewater treatment plants to capture and remove contaminants from wastewater. In this case, the interaction of air bubbles with particles of pollution with a hydrophobic surface. These interactions are very difficult to investigate because they are dynamic, subject to a large number of physical and chemical factors, and occur on a small scale. The processes mentioned above have traditionally been studied by laboratory experiments. These tests are tedious and time-consuming and show unsatisfactory accuracy. Analytical studies give idealized results. One of the most powerful alternatives for solving this problem is numerical modeling, which combines dynamics, accuracy and consideration of sophisticated details. This model is based on the discrete elements method. In this paper, a computer model for modeling the kinetics of the interaction of phases in wastewater treatment is considered.

Discrete Elements Method of Neutron Transport

1988 ◽  
Vol 98 (1) ◽  
pp. 41-50 ◽  
Author(s):  
Kirk A. Mathews
Keyword(s):  
Neutron Transport ◽  
Discrete Elements ◽  
Discrete Elements Method

Discrete Element Simulation of Powder Sintering for Spherical Particles

2020 ◽  
Vol 854 ◽  
pp. 164-171
Author(s):  
Ilia I. Beloglazov ◽  
Aleksei V. Boikov ◽  
Pavel A. Petrov
Keyword(s):  
Numerical Model ◽  
Model Simulation ◽  
Bulk Material ◽  
Experimental Studies ◽  
Spherical Shape ◽  
Discrete Element ◽  
Spherical Particles ◽  
Large Set ◽  
Discrete Elements ◽  
Powder Sintering

This paper presents a numerical simulation of powder sintering. The numerical model presented in this paper uses the discrete element method, which suggests that the material can be modeled by a large set of discrete elements (particles) of a spherical shape that interact with each other. A methodology has been developed to determine the DEM parameters of bulk materials based on machine vision and a neural network algorithm. The approach is suitable for obtaining the exact values of the DEM parameters of the investigated bulk material by comparing the visual images of the material’s behavior at the experimental stand in reality and in the model. Simulation of sintering requires an introduction of cohesive interaction between particles representing interparticle sintering forces. Numerical sintering studies were supplemented with experimental studies that provided data for calibration and model validation. The experimental results have shown a significant capability of the designed numerical model in modeling sintering processes. Evolution of microstructure and density during sintering have been studied under the laboratory conditions.

Prediction of the permeability of proppant packs under load

2015 ◽  
Vol 26 (10) ◽  
pp. 1550117
Author(s):  
Dmitry Bikulov ◽  
Anton Saratov ◽  
Eugene Grachev
Keyword(s):  
Grain Size ◽  
Standard Procedure ◽  
Mechanical Deformation ◽  
Size Distributions ◽  
Discrete Elements ◽  
Grain Size Distributions ◽  
Optimal Material ◽  
Different Grain Size ◽  
Boltzmann Method ◽  
Discrete Elements Method

The calculation of proppant pack properties under load is useful to determine the optimal material parameters and grain size distribution. A simple, yet effective model for simulation of both mechanical deformation and permeability of the pack in specific case of polymeric proppant is presented. The mechanical deformation modeling is similar to the discrete elements method, where permeability is calculated with the lattice Boltzmann method. The simulation imitates the standard procedure for measuring the conductivity of a proppant. Permeabilities for different loads and different grain size distributions are obtained.

scholarly journals Elastic wave velocity and attenuation in granular material

2021 ◽  
Vol 249 ◽  
pp. 11001
Author(s):  
Fan Jia ◽  
Hongyang Cheng ◽  
Sihong Liu ◽  
Vanessa Magnanimo
Keyword(s):  
Quality Factor ◽  
Wave Velocity ◽  
Granular Media ◽  
Confining Pressure ◽  
Elastic Wave Velocity ◽  
Input Frequency ◽  
Discrete Elements ◽  
Seismic Quality Factor ◽  
Waves Propagation ◽  
Discrete Elements Method

Discrete Elements Method simulations are carried out to investigate waves propagation in isotropic, frictional granular media. The focus is on the effects of confining pressure, microstructure and input frequency on both wave velocity and attenuation. The latter is described via the seismic quality factor Q and three different measurement approaches are compared, in time and frequency domain. The simulation data validate previous findings on the scaling of wave velocity with confining pressure and coordination number. The quality factor Q shows a non-monotonic behavior with input frequency.

Numerical Simulation of Geological Faults by Discrete Elements Method

2019 ◽  
Author(s):  
V. Lisitsa ◽  
V. Tcheverda ◽  
V. Volianskaia
Keyword(s):  
Numerical Simulation ◽  
Discrete Elements ◽  
Geological Faults ◽  
Discrete Elements Method

scholarly journals A Calculation Method for Interconnected Timber Elements Using Wood-Wood Connections

Buildings ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 61 ◽  
Author(s):  
Julien Gamerro ◽  
Jean François Bocquet ◽  
Yves Weinand
Keyword(s):  
Calculation Method ◽  
Large Scale ◽  
Limit State ◽  
Digital Fabrication ◽  
Calculation Model ◽  
Free Form ◽  
Structural Elements ◽  
Timber Constructions ◽  
Building Components ◽  
Vibration Tests

Wood-wood connections, widely used in the past, have been progressively replaced by steel fasteners in timber constructions. Currently, they can be manufactured and implemented more efficiently thanks to digital fabrication techniques. In addition, with the emergence of new timber plate engineered products, digitally produced wood-wood connections have been developed with a strong focus on complex free-form geometries. The gained knowledge through research and building implementations have pushed the development of more standardized structural elements. As a result, this work presents a new concept of building components using through tenon connections based on the idea of transportable flat-packs directly delivered and assembled on site. The main objective of this research is to develop a convenient calculation model for practice that can capture the semi-rigid behavior of the connections and predict the effective bending stiffness of such structural elements. A case study is used as a reference with three large-scale slabs of a 8.1 m span. Bending and vibration tests are performed to study the mechanical behavior and assess the proposed calculation method. The results show the high influence of the semi-rigid behavior of connections on the bending properties and, therefore, on the serviceability limit state. The model is in good agreement with the test results, and further improvements can be made regarding the local behavior of the connection. This study demonstrates the feasibility of the proposed construction system and the applicability of the developed calculation model to design practice.

scholarly journals COMPARATIVE ANALYSIS OF DESIGN SOLUTIONS OF METAL SILOS

2019 ◽  
Vol 2 (53) ◽  
pp. 54-60
Author(s):  
Sergii Pichugin ◽  
Kateryna Oksenenko
Keyword(s):  
Loose Material ◽  
Bulk Material ◽  
Structural Elements ◽  
Bulk Materials ◽  
Flat Bottom ◽  
Housing Design ◽  
Advantages And Disadvantages ◽  
History Of ◽  
The Common

Concept of bulk material and complexity of storing it are explained. The dependence between the physical and mechanicalproperties of the loose material and type of construction in which it is stored. Structural elements considered silos and siloswith conical and flat bottom are described. The common characteristics of metal silos for bulk materials are given. The classification of metal silos by type of housing design is given. The advantages and disadvantages of silos are described.The possibility of storage of bulk materials in cylindrical shells is analyzed depending on the type of construction. The history of occurrence of structures of spiral-fold silos is considered. The set of equipment for the construction of the housing ofthe spiral-fold silos is given, the step-by-step process of formation of the folding lock and features of the installation processare presented. The analysis of the structure is made and the advantages and disadvantages of spiral-fold silos are determined.

scholarly journals NUMERICAL SIMULATION OF THE BROKEN ROCK MASS TRANSPORTATION IN A ROTATING PIPELINE

2021 ◽  
Vol 2 (4) ◽  
pp. 141-150
Author(s):  
Guil Nam Khan ◽  
Evgeny P. Rusin
Keyword(s):  
Cross Section ◽  
Bulk Material ◽  
Longitudinal Axis ◽  
Pneumatic Conveying ◽  
Discrete Elements ◽  
Cross Sectional ◽  
Horizontal Pipe ◽  
Angular Velocities ◽  
The Cross ◽  
The Impact

The impact of the angular velocity of a horizontal pipe rotating around its longitudinal axis and the shape of its cross-section on the efficiency of pneumatic conveying of bulk material in it has been numerically investigated by the discrete elements method. The maximum number of non-contact particles, that is, particles being not in contact with other material particles and with the pipe, in the cross section of the pipe during one its revolution, is assumed the condition for effective pneumatic conveying. A method for searching for non-contact particles is proposed, which makes it possible to calculate their number at fixed pipe position angles during its rotation. For various cross-sectional shapes, the optimal angular velocities are determined at which the average number of non-contact particles in the cross-section is maximum. The results of the study can be used to increase the productivity of the removal of products of destruction when drilling horizontal boreholes in rocks and soils.

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