Papers by Keyword: Granular Flow

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Authors: Juan Daniel Muñoz-Andrade, A. Mendoza-Allende, Gabriel Torres-Villaseñor, J.A. Montemayor-Aldrete
Authors: Feng Xia Liu, Wei Wei, Zhi Jun Liu, Tao Tian Leng, Zhi Yi Li
Abstract: Using a two-dimensional Discrete Element Method (DEM) computer simulation, dense granular flows with the particle size range of 2-3 mm were studied between two vertical waved plates. The hydrodynamic characteristics, such as flow pattern, distribution of stress, velocity and trajectory of particles were analyzed in the process of granular flow. The results were compared to those of the flows between two vertical flat plates. The results indicated that the transient stress between waved plates was heterogeneous; the zigzag-like pressure profiles on the waved pate increased. Conclusions could be drawn that the formation of dense particle clusters disturbed spatial homogeneity and resulted in collisional anisotropy which was propitious to enhance the process of momentum, heat and mass transmission.
Authors: Wojciech Tomasz Sołowski, Scott William Sloan
Abstract: The material point method is a novel numerical technique which is especially well-suited to solving problems involving large or extreme deformations. This paper shows the results of the modelling of flow of granular material in inclined channels. During the calculations the granular material is approximated by a Mohr-Coulomb constitutive model. The computed flow is subsequently compared to experimental results published in the literature.
Authors: Zhen Wei Xiong, Xin Ling Liang, Xian Xing Dai, Ping Wang
Abstract: when the ballast track stretch with the bridge, ballast which is near expansion joint will move confusedly. As a result, rail produced vertical deformation. The deformation will affect the running safety and comfortability of train. At present, there are two kinds of treatments which are cover board structure and baffle structure to deal ballast’s movement. Aiming at the different modes of stretching when the two kinds of structures and different arrangement condition of bridge plate are applied, the rail-sleeper-ballast discrete element model is developed by the method of two-dimensional granular flow. The relationship between rail deformation and bridge expansion is analyzed on the foundation of the model. Results show as flows: when bridge extends or shortens, rail always produced upwarp deformation. Bridge plate should arrange asymmetrically. Like this, the rail deformation decrease by 40%. And adopting the baffle structure can effectively reduce the influence of bridge expansion in ballast truck.
Authors: Hui Chun Peng, Qing He
Abstract: 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.
Authors: Mahbubur Rahman, Hai Ping Zhu
Abstract: This paper presents a comparison numerical study of the dry and wet granular flows in a cylindrical hopper with flat bottom by means of the discrete element method. A cohesion model is used to examine the impact of moisture presence in hopper flow. It is found that with the increase of Bond number, the discharge rate decreases. The particle force structure inside the hopper is investigated to explain the reason of the lower discharge rate for the wet particle cases. Compared with the dry particle case, in the wet particle case there are more force chains in the transitional zone and near orifice, which causes the lower flowability of particles.
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