A Numerical Study on Interparticle Collisions in a Microseparator/Classifier by a Macroscopic Particle Model

2010 ◽  
Vol 43 (1) ◽  
pp. 56-62 ◽  
Author(s):  
Shinichi Ookawara ◽  
Madhusuden Agrawal ◽  
Kohei Ogawa
Keyword(s):  
Numerical Study ◽  
Particle Model ◽  
Interparticle Collisions

scholarly journals Discrete Model for Concrete Fracture: Numerical Study of Dynamic Response

2016 ◽  
Vol 16 (2) ◽  
pp. 101-108
Author(s):  
Josef Květoň ◽  
Jan Eliáš
Keyword(s):  
Numerical Study ◽  
Voronoi Tessellation ◽  
Time Discretization ◽  
Constitutive Law ◽  
Particle Model ◽  
Concrete Fracture ◽  
Linear Elastic ◽  
Random Geometry ◽  
Scale Particle ◽  
Method Model

Abstract The contribution presents simulations on concrete specimens. The discrete meso-scale particle model with random geometry based on Voronoi tessellation is used. The model was enhanced with dynamic solver based on implicit Newmark method. Model is tested on cantilever beam loaded by a force at the free end to verify the ability of the model to simulate the dynamic behavior of a simple linear elastic material. Results computed with different time discretization and model settings are compared. The behavior of the model in nonlinear regime is investigated on concrete specimens loaded at different displacement rates. The constitutive law used within this contribution is insensitive to strain rate.

Numerical Study of Flow and Heat Transfer in Novel Structure Packed Beds

2009 ◽  
Author(s):  
Jian Yang ◽  
Qiuwang Wang ◽  
Min Zeng
Keyword(s):  
Heat Transfer ◽  
Particle Shape ◽  
Heat Transfer Performance ◽  
Numerical Study ◽  
Particle Model ◽  
Physical Parameters ◽  
Packed Beds ◽  
Transfer Performance ◽  
Flow And Heat Transfer ◽  
Better Than

A forced convection heat transfer inside micro pores of structure packed beds with spherical or ellipsoidal particles are numerically studied in this paper. Three-dimensional Navier-Stokes equations and RNG k-ε turbulence model with scalable wall function are adopted for present computations. The effects of packing form and particle shape are carefully studied and the flow and heat transfer performances in uniform and nonuniform packed beds are also compared in detail. The macroscopic hydrodynamic and heat transfer results are obtained from micro pore cells by using integrating method. The results show that, with the same physical parameters, the pressure drops in structure packed beds are much lower than those in randomly packed beds while the overall heat transfer efficiencies (except SC packing) are much higher. The traditional correlations of flow and heat transfer extracted from randomly packings are unavailable for structured packings, and some modified correlations are obtained. Furthermore, it finds that, with the same particle shape (sphere), the overall heat transfer performance of SC packing is better than that of BCC packing. With the same packing form (BCC), the overall heat transfer performance of spherical particle model is better than that of ellipsoidal particle model and with the same particle shape and packing form (BCC packing with sphere), the overall heat transfer performance of uniform packing is better than that of non-uniform packing.

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