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  • Simulation study on interaction coefficient of DEM in non ...

    Simulation study on interaction coefficient of DEM in non–spherical large size (5–30 mm) coal particles Daolong Yanga,b,*, Yanxiang Wanga,b,*, Jianping Lic, Qingkai Wangb, Yuntao Wanga, Yanting Yua aSchool of Mechareonic Engineering, Jiangsu Normal University, Xuzhou 221116, China bState Key Laboratory of Process Automation in ...

  • Numerical analysis of non-spherical particle effect on ...

    In laser-powder bed fusion (L-PBF) additive manufacturing, the powder particles commonly produced by gas atomization have some non-sphericities. It is known that non-spherical particles affect the particle packing process, however, there is a limited understanding of their effect on molten pool dynamics resulted from laser-powder interaction. In this paper, the non-sphericities in L-PBF were ...

  • Origin of Spherical Particles in Lubricants

    Filtergram of large spherical particle (500x magnification) Electrical Discharge Erosion. Yuansheng and Chenbiao also generated spheres by electric arc sparking. They found that micro sparks could cause debris to collect and form into small droplets of molten steel which took on a spherical shape due to rapid cooling under the action of surface ...

  • 作者: Jim Fitch
  • Experimental Research on Hydraulic Collecting Spherical ...

    particle diameter, mining depth, and gas flux rate ar e investigated. The research of flow around a sphere is the foundation of study on hydraulic collecting. Achenbach [

  • Metal and Metalloid Contaminants in Atmospheric Aerosols ...

    Mining operations are a potential source of particulate matter containing metal and metalloid contaminants, such as lead and arsenic. ... Utilizing electron dispersive spectroscopy, the spherical particle in Figure 10 (a) was found to contain 21.19± 4.45 % lead by weight, and similar spherical particles, which were ubiquitous in sub-micron ...

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  • Calibration of the discrete element method: Strategies for ...

    In the agricultural and mining sectors the filling, storage and discharge from silo's, ... Different non-spherical particle shapes were investigated which included clumped (multi-sphere) particles with either 3, 5 or 10 comprising spheres and faceted particles with 23 faces. The shape and size of the particles were based on scanned models of ...

  • Settling behavior of spherical particles in fiber ...

    1. Introduction. Settling and sedimentation occur in many areas of the petroleum industry and in process engineering operations. Typical applications include settling of drilled cuttings and proppants in drilling and fracturing fluids, design of separators and settling tanks, and hydraulic and pneumatic transportation of solids particle in mining, coal, and other industrial applications.

  • Discrete element modeling and simulation of non-spherical ...

    Taking the simplest spherical particles as an example, when the overlap area between particles is detected, it is determined that the particles are in contact with each other. And the centroid of the two contact surfaces is the contact point, and the central line between the centroid and the spherical particle is the direction of force.

  • Settling - Wikipedia

    Settling is the process by which particulates settle to the bottom of a liquid and form a sediment.Particles that experience a force, either due to gravity or due to centrifugal motion will tend to move in a uniform manner in the direction exerted by that force. For gravity settling, this means that the particles will tend to fall to the bottom of the vessel, forming a slurry at the vessel base.

  • The distribution of settling velocity of non-spherical ...

    The paper presents themethodology of determining particle settling velocity distribution in sample of spherical particles for turbulent motion for which settling velocity is defined by Newton ...

  • Motion of a spherical particle in a microbubble plume and ...

    The particle repeatedly rises and falls when j G = 0.05 mm/s, and it rises almost vertically when j G = 0.09 mm/s. The absolute value of the vertical velocity of the particle is lower than that of the bubble. There is a belt-like region where the bubble velocity is extremely lower behind the particle.

  • Experimental Research on Hydraulic Collecting Spherical ...

    energies Article Experimental Research on Hydraulic Collecting Spherical Particles in Deep Sea Mining Guocheng Zhao 1,2, Longfei Xiao 1,2,*, Tao Peng 1,2 and Mingyuan Zhang 1 1 State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; [email protected] (G.Z.); [email protected] (T.P.); [email protected] (M.Z.)

  • Numerical study of coarse coal particle breakage in ...

    Pneumatic conveying is therefore a preferred technique for underground mining. ... 2005) analyzed the effects of gravity, aerodynamics, and collisions with pipe walls on the motion of a single spherical particle in a horizontal pipe. A diagram of the particle motion and a force analysis are shown in Fig. 7, ...

  • Effect of particle motion on the hydraulic collection of ...

    Dec 14, 2019  Deep-sea mining, through which shattered coarse solid mineral resources are hydraulically collected and transported, is a promising solution for problems associated with resource exhaustion. This study reports some interesting phenomena observed in a series of upward pumping experiments conducted on a coarse sphere with a 2-cm radius. The sphere was hydraulically lifted

  • Basic principles of particle size analysis

    5 Basic principles of particle size analysis Figure 3 This also means that there cannot be anything like particle size standard for particles like grains of sand. Standards must be spherical for comparison between techniques. However we can have a particle size standard for a particular technique and this

  • Course - Fine Particle Processing - GB8505 - NTNU

    Understand the theory and practice of froth flotation, spherical agglomeration and selective flocculation methods of fine particle processing. Skills: The students should be able to assess fine particle processing by calculation of interacting energies between particles of their aggregation and/or dispersion, and separation efficiency.

  • Language of PS - Particle Technology Labs

    Spherical Diameter [or Volume Weighted Equivalent Spherical Diameter for laser diffractors]. This phrase is critically important to assess the possible subtleties underlying a particle size measurement result. Equivalent spherical diameter is defined by ISO 9276-1:1998(E) (2) as

  • free settling particle in mining

    free settling particle in mining Settling Velocityan overview ScienceDirect Topics For spherical particles there are well-established equations for predicting the terminal free-settling velocity u t as a function of particle diameter d and density ρ p fluid density ρ f and viscosity μ and gravitational acceleration g

  • The creeping motion of a spherical particle normal to a ...

    The creeping motion of a spherical particle normal to a deformable interface - Volume 169 - A. S. Geller, S. H. Lee, L. G. Leal

  • Generating Irregular Models for 3D Spherical-Particle ...

    The spherical particle calculation model of an open-pit slope in the Zijinshan gold-copper mine, which is the largest gold mine of the Zijin Mining Group in China, was constructed. The assumption that the geological body contains two sets of joints and a fault was applied. The dip and strike directions of these discontinuities are arbitrary in ...

  • Case study: Discrete element modeling of wear in mining ...

    Geometry of the simulated mining hopper: (a) 3D view of the hopper, and (b) plan, (c) front, and (d) elevation views. ... For investigating the effect of particle shape, the spherical or non ...

  • Application of Discrete Element Method to the Analysis of ...

    simple spherical bodies is shown in Figure 4. 2.1 Equations of motion In general the movement of a spherical particle having the radius Ri and mass mi consists of translational and rotatory movement and is described within the bounds of Newton's second law: ( ) , 1, 2 2 N j j i i t ij i n m dt d m F F g x (1) Figure 3. The manufacturing scheme ...

  • (PDF) Effect of particle shape in grinding mills using a ...

    applications in the mining industry. ... The differences between the spherical particle models and polyhedral particle models on the burden topography are also quantitatively and qualitatively ...

  • SPHERICAL GRAPHITE – unimate

    Particle Sizes Required -100 mesh The particle sizes of the graphite should be appropriate, the graphite cost is higher if using large flakes graphite, but if using too fine graphite and that will decrease the production output ratio of Spherical Graphite, which means the cost is also higher for finer graphite.

  • Case study: Discrete element modeling of wear in mining ...

    Geometry of the simulated mining hopper: (a) 3D view of the hopper, and (b) plan, (c) front, and (d) elevation views. ... For investigating the effect of particle shape, the spherical or non ...

  • Application of Discrete Element Method to the Analysis of ...

    simple spherical bodies is shown in Figure 4. 2.1 Equations of motion In general the movement of a spherical particle having the radius Ri and mass mi consists of translational and rotatory movement and is described within the bounds of Newton's second law: ( ) , 1, 2 2 N j j i i t ij i n m dt d m F F g x (1) Figure 3. The manufacturing scheme ...

  • (PDF) Effect of particle shape in grinding mills using a ...

    applications in the mining industry. ... The differences between the spherical particle models and polyhedral particle models on the burden topography are also quantitatively and qualitatively ...

  • SPHERICAL GRAPHITE – unimate

    Particle Sizes Required -100 mesh The particle sizes of the graphite should be appropriate, the graphite cost is higher if using large flakes graphite, but if using too fine graphite and that will decrease the production output ratio of Spherical Graphite, which means the cost is also higher for finer graphite.

  • The distribution of settling velocity of non-spherical ...

    The paper presents a method of determining the distribution of settling velocity in the sample of non-spherical particles for the turbulent particle motion in which the settling velocity is expressed by the Newton formula. Because it depends on thee size, density and shape factors of the particle, which are random variables of certain ...

  • Text Mining in Practice with R Wiley

    Chapter 2: Basics of text mining 1. 2.1 What is Text Mining in a practical sense? 1. 2.2 Types of Text Mining: Bag of Words. 1. 2.2.1 Types of Text Mining: Syntactic Parsing. 1. 2.3 The text mining process in context 1. 2.4 String Manipulation: Number of Characters Substitutions 1. 2.4.1 String Manipulations: Paste, Character Splits ...

  • Investigation of modeling non-spherical particles by using ...

    Discrete elements method (DEM) is widely used to research the particulate systems in industry. When the particle systems involving large numbers of non-spherical particles, in order to achieve the goal of monitoring the main properties of particles motion and improving the computational efficiency at the same time, a method of replacing the non-spherical particles by spherical []

  • Numerical Simulations on Mixing Dynamics of Spherical and ...

    Discrete element simulations provide valuable insight into the mixing dynamics of granular materials in industry. In this paper, numerical work is conducted in order to find the influence of pan rotational velocity and particle shape on mixing behavior. Four types of particles of different shapes were chosen: spherical, non-spherical type 1 (disk shape), non-spherical type 2 (capsule shape ...

  • Sanja Miskovic - Norman B. Keevil Mining Engineering

    Apr 24, 2020  An, X., Miskovic, I., Miskovic, S., “Numerical and experimental study on the packing densification of cubic-spherical particle mixtures under one-dimensional vibration”, 2015 AIChE Annual Meeting, Salt Lake City, UT, November 8 – 13, 2015

  • BLAZE-DEM: A LARGE SCALE GPU BASED DEM CODE. Nicolin ...

    In general, to obtain a similar mixing index (of 0.7), polyhedral shaped particle systems needed to be mixed for 50% longer than a spherical particle system which is concerning given the ...

  • Numerical simulation of tetrahedral particle mixing and ...

    A regular tetrahedron is the simplest three-dimensional structure and has the largest non-sphericity. Mixing of tetrahedral particles in a thin drum mixer was studied by the soft-sphere-imbedded pseudo-hard particle model and compared with that of spherical particles. The two particle types were simulated with different rotation speeds and drum filling levels. The Lacey mixing index []

  • Particle in a spherically symmetric potential - Wikipedia

    An important problem in quantum mechanics is that of a particle in a spherically symmetric potential, i.e., a potential that depends only on the distance between the particle and a defined center point.In particular, if the particle in question is an electron and the potential is derived from Coulomb's law, then the problem can be used to describe a hydrogen-like (one-electron) atom (or ion).

  • Particles sphericity sieving in metal powder industry ...

    Q: Why is particle shape such a key factor within metal powders screening: A: Irregular shaped particles represent a major hurdle within powder sieving. In facts, they tend to wedge into the mesh aperture, indipendently of their main dimensions.

  • CDC - Mining - Morphological and Elemental Classification ...

    Mining Publication: Morphological and Elemental Classification of Freshly Emitted Soot Particles and Atmospheric Ultrafine Particles using the TEM/EDS ... and coastal sites during ultrafine particle formation events (combustion and photochemical events). ... (spherical), metallic oxides (spherical and polygonal), C-rich refractory (not ...

  • Sanja Miskovic - Norman B. Keevil Mining Engineering

    Apr 24, 2020  An, X., Miskovic, I., Miskovic, S., “Numerical and experimental study on the packing densification of cubic-spherical particle mixtures under one-dimensional vibration”, 2015 AIChE Annual Meeting, Salt Lake City, UT, November 8 – 13, 2015

  • Particle Percolation in Block Caving Mines - CORE

    Knowledge of particle percolation impacts on both the economics and safety of cave mining operations. Nevertheless, very little research has focused on particle percolation in block or sub-level caving mines. ... The results were compared to corresponding numerical and physical experiments on mono-spherical particles with the same equivalent ...

  • Particles sphericity sieving in metal powder industry ...

    Q: Why is particle shape such a key factor within metal powders screening: A: Irregular shaped particles represent a major hurdle within powder sieving. In facts, they tend to wedge into the mesh aperture, indipendently of their main dimensions.

  • An Introduction To Particle Sizing Close Examination

    Examination of a particle under a microscope provides a two-dimensional image. There are a number of diameters that can be measured in order to characterize it. If you take maximum particle length as the diameter, then you are actually saying that the particle is a

  • CDC - Mining - Morphological and Elemental Classification ...

    Mining Publication: Morphological and Elemental Classification of Freshly Emitted Soot Particles and Atmospheric Ultrafine Particles using the TEM/EDS ... and coastal sites during ultrafine particle formation events (combustion and photochemical events). ... (spherical), metallic oxides (spherical and polygonal), C-rich refractory (not ...

  • Validation of an Exact Particle Modelling Method for ...

    A Hertz-Mindlin new restitution model is used to prevent overdamped contact when using multi-sphere model to represent a non-spherical particle. The particle modelling method we proposed is verified by the good agreement between the experimental and simulated results in terms of the angle of repose, sandpile formation time, and porosity.

  • Case study: Discrete element modeling of wear in mining ...

    Geometry of the simulated mining hopper: (a) 3D view of the hopper, and (b) plan, (c) front, and (d) elevation views. ... For investigating the effect of particle shape, the spherical or non ...

  • (PDF) Micro shape of coal particle and crushing energy

    Microscopic observations demonstrate the particle fraction with diameters less than 0.075 mm, produced from crushing coal samples, mostly takes on a spherical or ellipsoidal shape, and ...

  • A new algorithm for contact detection between spherical ...

    A new algorithm for contact detection between spherical particle and triangulated mesh boundary in discrete element method simulations Author(s) G.M. Hu, L. Hu, Y. Zhang, Z.Q. Fang Publisher Wiley Source International Journal for Numerical Methods in Engineering Keywords barycentric coordinates, Contact detection, Discrete element method Year 2013

  • How To Calculate D10 D50 D90

    Also a sphericity (spherical, non-spherical) measurement is done. Sieve the soil through a nest of sieves by hand shaking. 2 while drilling. Level of detail, V. [email protected] Here, ball indentation and shear cell methods are applied for glass beads of various size distributions, and the influence of particle size distribution on the ...

  • LONG-LIFE SEALED SPHERICAL ROLLER BEARINGS FOR

    Bearing series designed for Mining Machinery 2 Spherical Roller Bearings with Detachable Seal (SSRB) Durability and reliability are of paramount importance to bearings used in mining and quarrying conveyor applications, where failure can impact productivity of the entire operation. For the arduous and highly

  • Thermo Fisher particle analyser targets efficiency ...

    19 小时前  The PSM-500 particle size analyser pulls a continuous sample using a vacuum eductor. Samples are de-aerated in the conditioner before being passed between diametrically opposed ultrasonic sensors and returned to the process. "The ability to measure product out of the grinding circuit in real-time can have very large benefits.

  • Single Particle Crushing Test - Henan Mining Machinery and ...

    Prompt : Caesar is a famous mining equipment manufacturer well-known both at home and abroad, major in producing stone crushing equipment, ... WHICH SIZE TO MEASURE? A spherical particle can be described using a single number—the diameter— because every dimension is

  • A Case Study of Hydraulic Collecting a Single Spherical ...

    ABSTRACT. The characteristics of flow field and force of a single spherical ore particle in the hydraulic collecting have been investigated. Researches of hydraulic collecting spherical particles in various collecting heights and flow velocities have been carried out with numerical method and testing method.