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Evaluation of coarse-grained CFD-DEM models with the validation of PEPT measurements

Particuology 2023年第11期82卷 48-63页

作者： Hanqiao Che Dominik Werner Jonathan Seville Tzany Kokalova Wheldon kit windows-yule School of Chemical Engineering University of BirminghamB152TTUK School of Physics and Astronomy University of BirminghamBirminghamB152TTUK

Computational Fluid Dynamics coupled with Discrete Element Method (CFD-DEM) is a commonly used numerical method to model gas-solid flow in fluidised beds and other multiphase systems. A significant limitation of CFD-DEM is the feasibility of the realistic simulation of large numbers of particles. Coarse-graining (CG) approaches, through which groups of multiple individual particles are represented by single, larger particles, can substantially reduce the total number of particles while maintaining similar system dynamics. As these three CG models have not previously been compared, there remains some debate, however, about the best practice in the application of CG in CFD-DEM simulations. In this paper, we evaluate the performance of three typical CG methods based on simulations of a bubbling fluidised bed. This is achieved through the use of a numerical validation framework, which makes full use of the high-resolution 3D positron emission particle tracking (PEPT) measurements to rigorously validate the outputs of CFD-DEM simulations conducted using various different coarse-graining models, and various different degrees of coarse-graining. The particle flow behaviours in terms of the particle occupancy field, velocity field, circulation time, and bubble size and velocity, are comprehensively analysed. It is shown that the CG simulation starts to fail when the size ratio between the bed chamber and the particles decreases to approximately 20. It is also observed, somewhat surprisingly, that the specific CG approach applied to interparticle contact parameters does not have a substantial effect on the simulation results for the bubbling bed simulations across a wide range of CG factors.

关键词： Coarse-graining Discrete element method Computational fluid dynamics CFD-DEM Positron emission particle tracking(PEPT) Bubbling fluidised bed

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Ensuring adequate statistics in particle tracking experiments

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Particuology 2021年第6期19卷 43-54页

作者： C.R.K.windows-yule School of Chemical Engineering University of BirminghamEdgbastonBirmingham B152TTUnited Kingdom Institute for Multiscale Simulation Engineering of Advanced MaterialsFriedrich-Alexander Universitat Erlangen-NurnbergSchloBplatz 491054 ErlangenGermany

Particle tracking techniques such as magnetic particle tracking,radioactive particle tracking and positron emission particle tracking are widely used in academia and industry to image the dynamics of particulate and multiphase *** techniques can provide detailed data concerning a range of important,whole-field quantities based only on the time-averaged dynamics of a small number of tracer ***,in order for this data to be reliable,the duration over which these time-averages are taken must be suitably ***,the‘minimum averaging time’required to produce good statistics depends sensitively on the system in question and,at present,cannot be determined a priori in advance of an *** this paper,we take a step toward resolving this issue,using discrete element method simulations of a simple vibroﬂuidised granular bed to develop a series of scaling laws relating said minimum averaging time to a variety of key system *** scaling laws developed may be used by future experimentalists to predict the required averaging time for each given system during an experimental campaign,thus improving both the efficiency with which particle tracking techniques may be applied,and the reliability of the data produced thereby.

关键词： Granular Particle tracking Positron emission particle tracking Radioactive particle tracking Magnetic particle tracking Particle tracking velocimetry

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Effect of cylinder wall parameters on the final packing density of mono-disperse spheres subject to three-dimensional vibrations Author links open overlay panel

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Particuology 2024年第8期91卷 211-225页

作者： Jack R.Grogan Andrei L.Nicuşan Christopher R.K.windows-yule School of Chemical Engineering The University of BirminghamEdgbastonBirminghamB152TTUK

Achieving densely packed particles is desirable within the industries of ceramics,pharmaceuticals,defence and additive *** this work,we use the discrete element method(DEM)to determine the effect of wall parameters on the final packing density of mono-disperse spheres subject to 4 varying three-dimensional vibration and fill *** focus specifically on the impact of the container wall parameters on the particles'final packing *** on from the validation of the DEM simulation the particle-wall coefficient of restitution,the particle-wall coefficient of rolling friction and the particle-wall coefficient of sliding friction were varied individually and the effect on the final packing density *** relatively low particle-particle friction glass beads,the effect of these wall properties had no discernible effect on the final packing density *** on from these findings the particle-wall properties were varied at the extreme values of particle-particle coefficient of rolling friction and particle-particle coefficient of sliding *** a particle-particle coefficient of sliding friction=1,increases in particle-wall coefficient of restitution resulted in a minor increase in the final packing density of particles though this was not statistically *** a particle-particle coefficient of sliding friction=1,increases in particle-wall coefficient of rolling friction resulted in a minor decrease in the final packing density of the particles though again not to a degree where the trend can,with complete certainty,be distinguished from the random error across the ***,when the particle-particle coefficient of sliding friction=1,increases in particle-wall coefficient of sliding friction resulted in a significant decrease in the final packing density of *** decrease was attributed to the propagation of force chains throughout the *** significant decrease in final packing density with

关键词： Vibropacking Packing Densification Vibration Discrete element method Friction Wall friction Restitution

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Positron Emission Projection Imaging:A technique for concentration field measurements in opaque industrial systems

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Particuology 2024年第11期94卷 1-15页

作者： Roberto Hart-Villamil Jack Sykes Andy Ingram Christopher R.K.windows-yule Santosh Kumar Gupta School of Chemical Engineering University of BirminghamB152TTUK School of Physics and Astronomy University of BirminghamB152TTUK Hindustan Unilever R&D BengaluruKarnataka560066India

A novel Positron Emission Projection Imaging(PEPI)algorithm designed to compute the plane-projected spatial distribution of radiolabelled materials without the need for collimation is *** leveraging improved data efficiency,we have achieved a technique with enhanced spatial resolution and temporal resolution compared to previous PEPI *** of this algorithm was conducted using synthetic data generated from a digital twin of a PET scanner,demonstrating its accuracy for practical *** industrial advantage of this novel algorithm was applied in the imaging of laminar flow mixing within a ploughshare mixer,with the experimental results compared against those obtained from validated computational fluid dynamics(CFD)*** comparison highlights an important use case for PEPI as a robust validation tool for CFD simulations,crucial for enhancing industrial ***,which uses deeply penetrating gamma-photons,is now capable of imaging opaque fluids and solids in industrial *** directions for this work include further algorithmic refinements and expanding its application across various industrial systems,establishing PEPI as a robust tool for in-depth industrial process *** advancements presented here allow for optimized mixer design and enhanced process efficiency,extending the frontiers of tomographic imaging in industrial applications.

关键词： Positron emission projection imaging Positron emission particle tracking Computational fluid dynamics Mixing Ploughshare mixer

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基于ARM9与Wince的工业机器人示教装置设计与开发

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机床与液压 2016年第3期44卷 5-9,23页

作者：覃宇勒黄振峰毛汉领广西大学机械工程学院广西南宁530004

在工业机器人的应用过程中,示教装置已经成为机器人控制系统中不可或缺的一部分,其操作体验和性能的优劣直接关系到工业机器人使用效果。所设计的示教装置硬件结构和操作系统分别采用了基于ARM9的RISC ARM926EJ处理器和windows CE 5.0... 详细信息

在工业机器人的应用过程中,示教装置已经成为机器人控制系统中不可或缺的一部分,其操作体验和性能的优劣直接关系到工业机器人使用效果。所设计的示教装置硬件结构和操作系统分别采用了基于ARM9的RISC ARM926EJ处理器和windows CE 5.0操作系统,整体外壳采用3D快速成形打印技术研制。应用程序的开发环境为Microsoft Visual studio2008,以MFC为图形界面开发工具,采用串口通信实现示教装置与主控制器之间通信。该装置符合人体工程学,人机界面友好,运行稳定,满足控制的需要,具有较强的实用性。

关键词：示教装置 Wince嵌入式系统 3D打印串口通信数据通信协议

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