### Discrete element model of particle transport and premixing ...

2018-8-1 The results of the premixing-transportation experiment, using the modified screw conveyer type V, are depicted in the photographs, Fig. 2.These photographs show: (a) the initial mixture of zeolite and sand (granulation of particles was 4 mm), and the premixing results performed on the modified screw conveyer (type V), with the length of: (b) 400 mm, (c) 600 mm and (d) 800 mm.

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The influences of screw length, particle diameter, the studied geometry variations of screw design, on the mixing performances of the screw conveyor-mixer during material transport were explored. All investigations were performed experimentally and numerically, by using Discrete Element Method (DEM).

Get price### Discrete element model of particle transport and premixing ...

2018-8-1 The influences of screw length, particle diameter, the studied geometry variations of screw design, on the mixing performances of the screw conveyor-mixer during material transport were explored. All investigations were performed experimentally and numerically, by using Discrete Element Method

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Request PDF Discrete element model of particle transport and premixing action in modified screw conveyors In this paper, five types of horizontal single-pitch screw conveyors with modified ...

Get price### Modified screw conveyor-mixers – Discrete element modeling ...

2015-9-1 Numerical models based on DEM (Discrete Element Method) showed to be reliable and useful in catching particle interactions and predicting mixing process for investigation of solids mixing. The soft-sphere method originally developed by Cundall and Strack was the first granular dynamics simulation technique published in the open literature.

Get price### Discrete particle model for sheet flow sediment transport ...

Discrete particle model for sheet flow sediment transport in the nearshore Thomas G. Drake and Joseph Calantoni• Department of Marine, Earth and Atmospheric Sciences, North Carolina State University, Raleigh, North Carolina, USA Abstract. Fully three-dimensional discrete particle

Get price### Discrete element modelling of large scale particle systems ...

2014-4-15 The corresponding discrete element model, assumed to have been scaled, is a geometrically exact representation of the physical problem, i.e. both models have the same particle number and particle packing configuration, and the particle sizes and the domains in the two models are different only by a constant (spatial) scale factor \(h\).

Get price### Discrete Element Modeling of Cone Penetration Tests ...

Particle crushing was simulated during CPTs by replacing a broken particle with two new equal-sized smaller particles. The results showed that there was a considerable reduction in the tip resistance for the crushing model compared with the noncrushing model, and this reduction increased as the confining stress increased.

Get price### A discrete particle model and numerical modeling of the ...

2005-12-1 – To present a discrete particle model for granular materials., – Starting with kinematical analysis of relative movements of two typical circular grains with different radii in contact, both the relative rolling and the relative sliding motion measurements at contact, including translational and angular velocities (displacements) are defined.

Get price### Difference between discrete particle and discrete element ...

I am very confused between discrete particle model and discrete element methods. I have gone through a lot of literature but couldn't get a proper difference between them.

Get price### Discrete element model of particle transport and premixing ...

The influences of screw length, particle diameter, the studied geometry variations of screw design, on the mixing performances of the screw conveyor-mixer during material transport were explored. All investigations were performed experimentally and numerically, by using Discrete Element Method (DEM).

Get price### DEM study of particle motion in novel high-speed seed ...

2021-4-28 A discrete element method (DEM) model of a centrifugal fertiliser spreader was developed. ... Discrete element model of particle transport and premixing action in modified screw conveyors ...

Get price### Discrete Element Modeling of Particle Transport by an ...

Particle transport by a planar electric curtain is studied with a discrete element method (DEM). The electric curtain is consists of four sets of parallel stripe electrodes embedded in an insulating material. The electrodes are connected to a four-phase square-wave AC source and produce a traveling wave above the curtain plate. Current work focuses on different modes of particle transport and ...

Get price### Discrete element method - Massachusetts Institute of ...

2016-9-21 The discrete element method (DEM) is an intuitive method in which discrete particles collide with each other and with other surfaces during an explicit dynamic simulation.Typically, each DEM particle represents a separate grain, tablet, shot peen, etc. DEM is not applicable to situations in which individual particles undergo complex deformation.

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Discrete element model of particle transport and premixing action in modified screw conveyors. Article. ... Static mixer is used for premixing action before the main mixing

Get price### Discrete Element Modeling of Cone Penetration Tests ...

Particle crushing was simulated during CPTs by replacing a broken particle with two new equal-sized smaller particles. The results showed that there was a considerable reduction in the tip resistance for the crushing model compared with the noncrushing model, and this reduction increased as the confining stress increased.

Get price### Discrete particle simulation of particle–fluid flow: model ...

Discrete particle simulation of particle–fluid flow: model formulations and their applicability - Volume 661 ... (CFD) for continuum fluid and the discrete element method (DEM) for discrete particles has been increasingly used to study the fundamentals of coupled particle–fluid flows. Different CFD–DEM models have been used.

Get price### A discrete model for simulating shear strength and ...

2012-8-26 This study focuses on numerical modelling of rockfill material with the discrete element method (DEM). This method was used due to the special features of rockfill material, such as intense particle breakage and high contracting behaviour, which are inherently due to large particle size. Because the DEM models the interaction of separate elements, it is capable of modelling discrete structures ...

Get price### Modelling the solids inflow and solids conveying of single ...

A new solids-conveying model for the single-screw extruder based on the Discrete Element Method (DEM) is proposed in this work. The polymer solids are treated as spherical particles moving in a 3-D environment which includes the feed hopper, the solids-inflow zone, and the solids-conveying region of an extruder, without inclusion of the plug flow assumption common to continuum models.

Get price### A coupled discrete element model for the simulation of ...

The discrete element method is used to simulate the large deformation behavior of the sand particles, and the Darcy fluid model is coupled with this approach to simulate fluid flow through porous sand media. A coupled 3D discrete element model is developed and implemented based on this scheme.

Get price### Discrete element model of particle transport and premixing ...

The influences of screw length, particle diameter, the studied geometry variations of screw design, on the mixing performances of the screw conveyor-mixer during material transport were explored. All investigations were performed experimentally and numerically, by using Discrete Element Method (DEM).

Get price### Discrete Element Modeling - Jenike Johanson

DEM (discrete element method) is a numerical technique that models the interaction between individual particles and boundaries to predict bulk solids behavior. This tool can easily model moving boundaries and is used to gain better understanding of particle flow dynamics. The knowledge is then applied to design more efficient equipment, thus ...

Get price### Discrete element method - Massachusetts Institute of ...

2016-9-21 The discrete element method (DEM) is an intuitive method in which discrete particles collide with each other and with other surfaces during an explicit dynamic simulation.Typically, each DEM particle represents a separate grain, tablet, shot peen, etc. DEM is not applicable to situations in which individual particles undergo complex deformation.

Get price### Distinct/Discrete Element Method

2018-4-30 Introduction: What is DEM? Distinct / Discrete Element Method (DEM) • a way of simulating discrete matter • a numerical model capable of describing the mechanical behaviour of assemblies of discs and spheres • a particle-scale numerical method for modeling the bulk behavior of • granular materials and many geomaterials (coal, ores, soil, rocks, aggregates)

Get price### Modified screw conveyor-mixers – Discrete element modeling ...

In this paper, fifteen horizontal single-pitch screw conveyors with modified geometry and the different lengths were investigated for premixing action, during the transport of materials. All investigations were performed experimentally and numerically, by using Discrete Element Method (DEM).

Get price### Introduction to Discrete Element Methods

2008-8-29 modeling of particles using so-called discrete element methods (DEM). Even though millions of particles can be simulated, the possible length of such a particle system is in general too small in order to regard it as macroscopic. Therefore, methods and tools to perform a so-called micro-macro transition (Vermeer et al., 2001; Pöschel et

Get price### 3D assessment of fracture of sand particles using discrete ...

2020-1-22 In this study, the fracture of individual silica sand particles was modelled by adopting the bonded particle model concept within the framework of the discrete element method (DEM). Individual three-dimensional (3D) particles were generated as an agglomerate of a large number of small spherical sub-particles that were connected by parallel ...

Get price### Using CFD-DEM Coupling to Model Non-Spherical Particle and ...

2019-9-11 The movement of the hair strands in the cyclone can be simulated using a one-way coupling between Fluent and Rocky DEM’s flexible fiber particle model. This simulation can be used for conceptual device testing, which reduces the number of

Get price### Periodic boundary conditions of discrete element method ...

2017-5-24 This paper presents a periodic boundary condition for the coupled discrete element and lattice Boltzmann method for simulating fluid-particle systems. Detailed implementation of this special boundary condition is given. Besides, the detailed procedure of immersed moving boundary scheme for fluid–solid coupling is proposed. The accuracy and applicability of the proposed periodic boundary ...

Get price### Micromechanical Discrete Element Modeling of Asphalt ...

This study aims to investigate the shear fatigue performance of asphalt mixture and factors influencing performance using a three-dimensional (3D) discrete element method (DEM) incorporated with the Burgers model. The repeated uniaxial penetration test (RUPT), which is a shear fatigue test method for asphalt mixtures, was succinctly described.

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