Journal
PARTICUOLOGY
Volume 8, Issue 2, Pages 161-175Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.partic.2009.07.006
Keywords
Large scale simulations; Contact force models; Discrete Element Method; Stiffness; Particle overlap
Funding
- Humboldt Foundation
Ask authors/readers for more resources
The aim of this work is to systematically investigate the effect of the normal force law and the applied stiffness on the behavior of single particles and particle systems. A detailed review of the literature regarding altered stiffnesses and their use in force laws is provided. The effect on macroscopic simulation properties such as contact numbers, velocity profiles, discharge rates and quality of dispersion for different fractions of maximum overlap is studied in the case of a stirrer vessel and a rectangular hopper. In order to provide further acceleration beyond the limits imposed by classical force models, a number of alternative force laws are developed which have a more favorable ratio between contact time and maximal overlap. Their employment in large scale simulations is investigated in light of their applicability. Some of the suggested force law modifications reveal artificial characteristics requiring further alteration. (C) 2009 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
Article
Engineering, Chemical
Polarized imaging dynamic light scattering for simultaneous measurement of nanoparticle size and morphology
Bingyao Wang, Tianyi Cai, Xiaoshu Cai, Wu Zhou, Zeqi Liu
Summary: The size and morphology of nanoparticles significantly impact their performance. Current methods, such as electron microscopy or atomic force microscopy, have limitations in sample preparation, processing time, and quantitative characterization. Therefore, it is crucial to develop a fast, accurate, and statistical method for measuring nanoparticle size and morphology. In this study, a new method called polarized imaging dynamic light scattering (PIDLS) is proposed, which irradiates nanoparticles with a vertical linearly polarized laser beam and utilizes a polarization camera to collect dynamic light scattering images at different polarization directions. The method effectively determines particle size, morphology, and sphericity based on depolarization patterns and degree of linear polarization. PIDLS also enables simultaneous measurement of particle size and morphology distributions, allowing for the evaluation of particle uniformity. The effectiveness of PIDLS is validated with the measurement of five types of industrial titanium dioxide.
PARTICUOLOGY (2024)
Article
Engineering, Chemical
Sono-assembly of folate-decorated curcumins/alginate core-shell microcomplex and its targeted delivery and pH/reduction dual-triggered release
Qingye Meng, Shuangling Zhong, Jingfei Wang, Zhenqian Zhang, Yan Gao, Xuejun Cui
Summary: In this study, a non-toxic natural polysaccharide, sodium alginate (SA), was developed for targeted delivery of curcumin (CUR) in tumor therapy. The CUR was coated in microcapsules using a quick, efficient, and environment-friendly sonochemical method. The microcapsules showed similar toxicity to free curcumin in anti-tumour evaluation and exhibited effective antibacterial properties. This research has the potential to provide a low-cost tumor targeting vector and can be promoted for clinical application.
PARTICUOLOGY (2024)
Article
Engineering, Chemical
Ray tracing particle image velocimetry-Challenges in the application to a packed bed
Christin Velten, Mirko Ebert, Christian Lessig, Katharina Zaehringer
Summary: Ray tracing Particle Image Velocimetry (RT-PIV) is an optical technique that corrects for distortions in velocity measurements caused by transparent geometries in challenging optical systems. This study focuses on the challenges and implications of using RT-PIV in a body centred cubic (bcc) sphere packing with gaseous flow, where transparent glass balls are used for optical access. The results demonstrate the effectiveness of the method in reconstructing velocity fields behind transparent spheres.
PARTICUOLOGY (2024)
Article
Engineering, Chemical
Soft coarse-grained particle model for particle-fluid systems
Yanhao Ye, Ji Xu, Wei Ge
Summary: By modeling neighboring particles as a single coarse-grained particle, the discrete particle method (DPM) can now simulate industrial-scale particle-fluid systems. However, there is still a lack of a systematic approach to determine the properties and interaction models of these coarse-grained particles, which affects the predictability of the method. In this study, kernel functions for modeling the coarse-grained particles are constructed based on the analysis of collisions between predefined particle groups, and the model parameters are determined by equating the statistical properties of the coarse-grained particles to those of the real particles. This approach has been effective in simulating the homogeneous cooling of granular gas and experimental fluidized beds.
PARTICUOLOGY (2024)
Article
Engineering, Chemical
Hydroxyapatite composites with carbon allotropes: Preparation, properties, and applications
Boris I. Kharisov, Oxana V. Kharissova, Lucy T. Gonzalez, Yolanda Pena Mendez, Igor E. Uflyand, Idalia Gomez de la Fuente
Summary: Hydroxyapatite (HA) composites with carbon allotropes and nanocarbons are rapidly developing in materials chemistry, especially for medical applications. These composites can be synthesized using various methods and exhibit biocompatibility and hemocompatibility, making them suitable for bone regeneration and wastewater treatment.
PARTICUOLOGY (2024)
Article
Engineering, Chemical
A refined representation method of the particle size distribution curve based on grading entropy
Xing Li, Qun Chen, Zhaozhao Liu, Cheng Zhou, Chen Wang, Chen Chen
Summary: The particle size distribution (PSD) curve is an important expression of soil properties. However, existing characteristic parameters can only represent some points of the curve and fail to capture all the information. This paper introduces a new fraction characteristic parameter based on grading entropy and proposes a refined presentation method for the PSD curve. The new method not only represents the differences in curve width more accurately but also has higher discrimination ability. The application of this method in describing deposit distribution and predicting soil hydraulic conductivity is discussed. The research results can provide reference for the refined representation of PSD curves.
PARTICUOLOGY (2024)
Article
Engineering, Chemical
Temperature influence on minimum fluidization velocity: Complexity, mechanism, and solutions
Qingjin Zhang, Liangliang Fu, Guangwen Xu, Dingrong Bai
Summary: This study comprehensively analyzes the temperature effect on the minimum fluidization velocity (Umf) in fluidized-bed reactors. The analysis reveals the influence of temperature on Umf is determined by the relative importance of hydrodynamic forces and interparticle forces, which result in changes in gas properties, bed voidage, and physiochemical characteristics of particles. An equation is derived to predict the temperature influences on Umf under broad temperature conditions.
PARTICUOLOGY (2024)
Article
Engineering, Chemical
A simulation study on spatial and time resolution for a cost-effective positron emission particle tracking system
Josephine Oppotsch, Matthias Steinke, Miriam Fritsch, Fritz -Herbert Heinsius, Thomas Held, Nikoline Hilse, Viktor Scherer, Ulrich Wiedner
Summary: This work is the second part of a simulation study on processing densely packed and moving granular assemblies using PEPT. A cost-effective PET-like detector system is being developed to overcome the high cost of PET scanners commonly used for PEPT. Monte Carlo simulations and Geant4 software were used to study the spatial resolution of different scenarios, and it was found that oversampling and iteration improved the resolution significantly.
PARTICUOLOGY (2024)
Article
Engineering, Chemical
Transient flameout process of boron-magnesium agglomerates during combustion in oxygen-rich atmospheres
Lian Duan, Zhixun Xia, Yunchao Feng, Binbin Chen, Likun Ma, Jianxin Hu
Summary: In this study, boron-magnesium agglomerates with varying mass ratios were prepared and the combustion process of these agglomerates under different oxygen-rich concentrations were investigated. The results showed that when the mass fraction of magnesium powder in boron-magnesium agglomerates exceeded a certain threshold, a transient flameout process occurred. This process is affected by the magnesium content of the agglomerate and the oxygen concentration in the ambient atmosphere.
PARTICUOLOGY (2024)
Article
Engineering, Chemical
Optimization on crystallization process of the magnetic core lysozyme
Lixia Hou, Chunxiao Qu, Min Su, Zhihan Liang, Qi Hao
Summary: This study investigates the impact of polymer modified Fe3O4 nanoparticles on lysozyme (Lys) crystallization under different conditions, using functionalized Fe3O4 magnetic nanoparticles (Polymer C@Fe3O4) as nucleation agents. The findings show that the surface charge density of Polymer C@Fe3O4 is highest at a modification mass ratio of 8:3 for Fe3O4 to Polymer C. By adding 15% of the PolymerC@Fe3O4 prepared from Fe3O4 with an average particle size of 150 nm, magnetic core lysozyme (M-Lys) crystals with an average particle size of 11.08 mm, narrow size distribution, and regular morphology were obtained with a yield of 82.42% within 60 min.
PARTICUOLOGY (2024)
Article
Engineering, Chemical
Efficient synthesis of forsterite via high-temperature thermochemical reactions from boron mud waste without briquetting
Fangling Hu, Liangliang Fu, Qingjin Zhang, Guangwen Xu, Dingrong Bai
Summary: This study proposes a method for synthesizing high-quality forsterite using abundant boron mud waste through high-temperature thermochemical reactions. The reaction can be completed rapidly at low temperatures due to the high reactivity of fine raw powder materials. The synthesized forsterite products exhibit high densification, well-developed grains, and an activation energy of 165.5 kJ/mol in the temperature range of 1100-1500°C. This study provides a low-cost method for producing forsterite and an efficient solution for treating solid waste.
PARTICUOLOGY (2024)
Article
Engineering, Chemical
Crystal phase control and ignition properties of HNS/CL-20 composite microspheres prepared by microfluidics combined with emulsification techniques
Yi Liu, Yunyan Guo, Rui Zhu, Jinqiang Zhou, Zhengxu Lin, Kai Han, Chongwei An, Jingyu Wang, Bidong Wu
Summary: Improved controllability and energy density of ignition agents are important for the development of energetic composite materials. In this study, HNS/CL-20 composite microspheres were prepared using droplet microfluidics and emulsification techniques with GAP as the binder. The microspheres exhibited higher sphericity and particle size uniformity compared to raw HNS, and retained the crystal structure of both HNS and CL-20. The microspheres also showed higher apparent activation energy, better safety performance, and good dispersibility, demonstrating excellent ignition performance and significant energy release effects.
PARTICUOLOGY (2024)
Article
Engineering, Chemical
Experimental study on influence of blade angle and particle size on particle mechanics on a batch-operated single floor of a multiple hearth furnace
Max Kriegeskorte, Nikoline Hilse, Phil Spatz, Viktor Scherer
Summary: This study experimentally analyzed the particle mechanics of a single floor in a multiple hearth furnace. The results showed that increasing the blade angle led to an increase in the particle free surface area. The frequency distribution of the mean distance among particles provided information about the morphology of the particle bulk.
PARTICUOLOGY (2024)
Article
Engineering, Chemical
Hydrodynamics and OCM reaction performance in a bubbling fluidized bed reactor and a riser reactor
Min Cai, Shuangzhu Kong, Sheng Chen, Mengxi Liu, Chunxi Lu
Summary: Reasonable reactor design is crucial for increasing the C2 yield in the oxidative coupling of methane (OCM). This study focused on large-scale fluidized bed reactors and conducted experiments and simulations to investigate their hydrodynamics and reaction performance. The results showed that the consecutive reactions of ethylene were severe in the bubbling fluidized bed (BFB) reactor due to gas back-mixing, high solids holdup, and non-uniform solids distribution, while they were negligible in the riser reactor. Both reactors achieved isothermal operation for the OCM process, with the riser reactor showing higher C2 selectivity and yield compared to the BFB reactor. This study provides valuable information for OCM reactor design and commercialization.
PARTICUOLOGY (2024)
Article
Engineering, Chemical
Perspective on powder technology for all-solid-state batteries: How to pair sulfide electrolyte with high-voltage cathode
Jiangkui Hu, Shijie Yang, Yingying Pei, Xilong Wang, Yulong Liao, Shuai Li, Aolong Yue, Jia-Qi Huang, Hong Yuan
Summary: This review discusses the interfacial issues in all-solid-state lithium batteries (ASSLBs) based on sulfide solid electrolytes (SEs) and high-voltage cathodes, and proposes strategies to stabilize the electrolyte/cathode interfaces. The future research direction of electrolyte/cathode interfaces and the application prospects of powder technology in sulfide-based ASSLBs are also discussed.
PARTICUOLOGY (2024)
Share Paper
