Coarse-grained CFD-DEM simulation of elbow erosion induced by dilute gas-solid flow: A multi-level study

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL Powder Technology Pub Date : 2024-05-23 DOI:10.1016/j.powtec.2024.119916

Lei Xu , Xingchen Chen , Xiukai Wu , Jingyin Liang , Shiyi Bao , Qijun Zheng

引用次数: 0

Abstract

A coarse-grained (CG) approach, which can significantly facilitate large-scale modelling of particle systems, was proposed for predicting the surface erosion in an elbow pipe induced by dilute gas-particle flow. In the approach, the particle sizes and forces such as gas-particle interactions are scaled in terms of a CG ratio. A particle-level Shear Impact Energy Model (SIEM) is applied to calculate the erosion rate. The accuracy of the CG approach is evaluated extensively for different particle concentrations and tube diameters. The CG approach is found to work satisfactorily when suitable fluctuation velocities are used at the inlet of the tube. The reason is that the fluctuation velocities keep the kinetic energy of particles conservative within the elbow. An equation was provided for determining the magnitude of the fluctuation velocity in CG modelling of the elbow pipe and its universality is tested under different coarse-grained ratios and particle concentrations.

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对稀释气固流诱导的弯头侵蚀进行粗粒度 CFD-DEM 模拟：多层次研究

提出了一种粗粒度（CG）方法，用于预测稀释气体-粒子流在弯管中引起的表面侵蚀，该方法可极大地促进粒子系统的大规模建模。在该方法中，颗粒尺寸和气体-颗粒相互作用力等均按 CG 比进行缩放。应用颗粒级剪切冲击能量模型（SIEM）来计算侵蚀率。针对不同的颗粒浓度和管道直径，对 CG 方法的准确性进行了广泛评估。当在管道入口处使用合适的波动速度时，CG 方法的效果令人满意。原因是波动速度使弯管内颗粒的动能保持稳定。在对弯管进行 CG 建模时，提供了一个确定波动速度大小的方程，并在不同的粗颗粒比率和颗粒浓度下测试了该方程的通用性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.

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