Article
Materials Science, Multidisciplinary
Shaowei Sun, Xiaoliang Deng, Wenjun Zhu, Xiaoping Ou Yang
Summary: The developed thermal-mechanical coupling model based on the discrete element method (DEM) effectively captures the energy dissipation of HMX explosive particles during drop-weight impact. Simulation results show that energy dissipation increases with drop-weight height, particle size, and moment of inertia of particle, but decreases when sample mass increases under the same impact conditions. The dominant contribution to energy dissipation is found to be rolling friction dissipation in the absence of internal defects.
COMPUTATIONAL MATERIALS SCIENCE
(2022)
Article
Engineering, Chemical
Francisco Kisuka, Colin Hare, Chuan-Yu Wu
Summary: This study investigates the heat generation and contact temperatures during particle interactions. Both theoretical models and a finite element method (FEM) model are employed, and they agree well with each other. The study also identifies the dependence of temperature profiles on heat generation and material properties, and proposes simple theoretical solutions for further research on heat generation in granular flows.
Article
Computer Science, Interdisciplinary Applications
Li Ge Wang, Ruihuan Ge, Xizhong Chen
Summary: This paper aims to establish a breakage master curve of oblique impact using a DEM bonded contact model. It addresses two major issues in hindering the predictive capacity of DEM: the discrepancy of breakage probability evaluation and the lack of an oblique impact model. The study conducts digital twin of impact breakage using a DEM bonded contact model and proposes a new oblique impact model. The equivalent velocity in the oblique impact model successfully establishes a remarkable breakage master curve for all impact angles.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Computer Science, Interdisciplinary Applications
Yang Ye, Yawu Zeng, Shufan Cheng, Hanqing Sun, Xi Chen
Summary: Discrete element simulations were used to examine the breakage behavior of marble spheres upon oblique impact, leading to the proposal of a modeling method that successfully matched laboratory results. The study highlighted the importance of contact friction coefficient and impact angle in determining the breakage patterns of brittle particles under impact.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Mechanics
Linyu Shao, Jia Mao, Lanhao Zhao, Tongchun Li
Summary: A deformable spheropolyhedral-based discrete element method (DS-DEM) is proposed for predicting the evolution of fracture by coupling the finite element method (FEM) with the spheropolyhedral-based discrete element method (DEM). The method is adaptable in simulating the whole fracture process of quasi-brittle materials.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Materials Science, Multidisciplinary
Raimondas Jasevicius
Summary: The text discusses a model for the interaction of bacteria in a fluid, considering various specific forces such as steric, electrostatic double layer and hydrodynamic forces. Numerical experiments using DEM are conducted to compare movement with and without hydrodynamic forces. The comparison shows a difference in movement behavior.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Engineering, Geological
Yu-zhang Bi, Meng-jie Li, Dong-po Wang, Lu Zheng, Shuai-xing Yan, Si-ming He
Summary: Inspired by natural step-pool bed configuration, this study investigated the flow characteristics of viscous granular flow in an artificial step-pool system and proposed an optimization method. The results showed that the slope and layout spacing influenced velocity reduction ratio and peak impact force. The optimized structure exhibited improved energy dissipation and stable impact characteristics.
Article
Mechanics
Vanessa R. Kern, Cathy Jin, J. B. Bostwick, P. H. Steen
Summary: This study investigates the deposition of a falling drop during oblique impact and demonstrates that post-impact observations of the frequency spectrum and energy partition can be used to determine the drop's characteristics and wetting properties.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Engineering, Chemical
Fabio Biondani, Marco Morandini, Gian Luca Ghiringhelli, Mauro Terraneo, Potito Cordisco
Summary: The dissipative characteristics of particle dampers are difficult to predict due to their highly non-linear behavior. This study investigates the effect of two techniques, simplified frictional moment and reduction of contact stiffness, on the simulation efficiency, shear deformation capability of the particle bed, and prediction of dissipation performance. Numerical simulations are conducted over a wide range of motion regimes, frequencies, and amplitude levels, and compared with experimental results.
Article
Engineering, Chemical
Yijie Gao, Giovanni De Simone, Maya Koorapaty
Summary: This study aims to develop a quantitative simulation calibration and prediction platform for modeling powder compression using DEM and Luding elasto-plastic contact model. Influential parameters were determined and calibration was established between DEM parameters and compression profile of pharmaceutical powders. The platform could successfully provide quantitative predictions on compression profiles of mixtures for solid dose DP development.
Article
Engineering, Geological
Shijin Li, Alister Smith
Summary: Acoustic emission (AE) monitoring can detect particle-scale interactions that lead to macro-scale responses of granular materials, but the understanding of the fundamental links between particle-scale mechanisms and AE generation in particulate materials is lacking. This study establishes links between particulate-scale energies and AE activity measured at the macro-scale. The findings show that friction and damping in particulate rearrangement are the fundamental mechanisms contributing to AE generation, with friction being dominant. Relationships have been established between AE and dissipated plastic energy.
Article
Engineering, Mechanical
Xiang Li, Alireza Mojahed, Chongan Wang, Li-Qun Chen, Lawrence A. Bergman, Alexander F. Vakakis
Summary: This work investigates the irreversible energy transfers from a linear oscillator to a strongly nonlinear attachment composed of particle impact dampers. The discrete element method is utilized to simulate the strongly nonlinear dynamics of the dampers, and the dependence of energy transfers on specific damper configurations and granular dynamics is revealed.
NONLINEAR DYNAMICS
(2023)
Article
Mechanics
Yaolin Tai, Haijue Xu, Yuchuan Bai, Linan Li, Shibin Wang, Zhenyan Xia
Summary: The bouncing dynamics of droplets with various viscosities on superamphiphobic surfaces were experimentally investigated. A new theoretical model of the maximum spreading factor for viscous liquid droplets was proposed based on energy conservation and contact number T. The study found that liquid viscosity significantly affects the impact process, leading to an increase in contact time. A new time scaling was adopted to characterize the effects of viscosity on contact time, and showed excellent agreement with experimental results. These findings are important for surface design in various applications.
Article
Engineering, Geological
Yupeng Jiang, Yidong Zhao, Clarence E. Choi, Jinhyun Choo
Summary: This article introduces a hybrid continuum-discrete approach for efficiently simulating granular impact dynamics. By enhancing the existing methods and introducing new components, the proposed approach can accurately reproduce various parameters of granular impact dynamics. Through experimental validation and parameter studies, key factors for successful simulation are identified.
Article
Engineering, Chemical
Christian Eichler, Swantje Pietsch-Braune, Maksym Dosta, Alexander Schmidt, Stefan Heinrich
Summary: This study applied DEM to analyze particle flow behavior, porosity distribution, and pressure distribution in roller compaction process. Results showed that particles passing the smallest gap had higher velocity than roller surface, and lateral stress could be a reason for ribbon splitting.
Article
Engineering, Chemical
Nicolin Govender, Paul W. Cleary, Mehran Kiani-Oshtorjani, Daniel N. Wilke, Chuan-Yu Wu, Hermann Kureck
CHEMICAL ENGINEERING SCIENCE
(2020)
Article
Engineering, Multidisciplinary
Paul W. Cleary, Sharen J. Cummins, Matt D. Sinnott, Gary W. Delaney, Rob D. Morrison
APPLIED MATHEMATICAL MODELLING
(2020)
Article
Engineering, Multidisciplinary
Paul W. Cleary, Gary W. Delaney, Matt D. Sinnott, Sharen J. Cummins, Rob D. Morrison
APPLIED MATHEMATICAL MODELLING
(2020)
Article
Mechanics
Paul W. Cleary, Simon M. Harrison, Matt D. Sinnott, Gerald G. Pereira, Mahesh Prakash, Raymond C. Z. Cohen, Murray Rudman, Nick Stokes
Summary: The SPH method demonstrates strong predictive capabilities in a variety of challenging fluid flow applications, including free surface hydrodynamics, fluid-structure interactions, and multiphase flows. It exhibits advantages in handling free surfaces, strong advection, high deformation levels, and intrinsic history tracking, making it well suited for these applications.
INTERNATIONAL JOURNAL OF COMPUTATIONAL FLUID DYNAMICS
(2021)
Article
Engineering, Chemical
Paul W. Cleary, Rob D. Morrison
Summary: This paper presents a set of related methods for computational geometry analysis of a cone crusher, which provides geometric information to understand cone crusher flows and breakage with key geometric parameters. The algorithms can calculate geometric measures and demonstrate how systematic variation affects geometric measures. OSS and CSS vary almost linearly with cone height and eccentric angle, while choke area and CSS are independently controllable. Linear and area-based estimates can be used to bound likely breakage performance.
MINERALS ENGINEERING
(2021)
Article
Engineering, Chemical
Paul W. Cleary, Matt D. Sinnott
Summary: The pressure distribution between the rolls in a HPGR is expected to vary significantly in the axial direction, potentially reducing equipment performance efficiency. However, experimental measurement of this axial pressure distribution and its consequences for breakage efficiency is challenging. Using DEM to predict the flow and breakage of particles within HPGR is a feasible solution.
MINERALS ENGINEERING
(2021)
Article
Engineering, Chemical
Nicolin Govender, Paul W. Cleary, Daniel N. Wilke, Johannes Khinast
Summary: This paper investigates the effect of particle shape on material behavior in screw conveyors, revealing that particle shape plays a crucial role in screw conveyors, especially at higher rotation speeds. Spheres and polyhedra exhibit similar bulk discharge rates at lower rotation speeds, but particle shape influences the packing structure and collision dynamics between particles.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Biotechnology & Applied Microbiology
M. D. Sinnott, S. M. Harrison, P. W. Cleary
Summary: This article introduces a particle-based modeling approach to simulate various challenges in food processing operations, such as liquid and solid mixing, fragmentation of solids and liquids, and multiphase behavior. The approach combines Smoothed Particle Hydrodynamics (SPH) representations of continua and Discrete Element Model (DEM) representations of discrete components. Six example applications in food manufacturing are demonstrated to show the effectiveness of the approach in addressing complex simulations, and the benefits of this particle-based modeling approach are discussed.
FOOD AND BIOPRODUCTS PROCESSING
(2021)
Article
Engineering, Multidisciplinary
Dhairya R. Vyas, Sharen J. Cummins, Murray Rudman, Paul W. Cleary, Gary W. Delaney, Devang Khakhar
Summary: The study explores the use of frictional boundary conditions in modeling elastic collisions with Smooth Particle Hydrodynamics (SPH), and introduces a new Collisional SPH method for accurate prediction of rebound kinematics and surface deformation. This method opens up new avenues for modeling collisional deformations and dynamics in granular systems using SPH.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Materials Science, Multidisciplinary
Sharen Cummins, Paul W. Cleary, Gary Delaney, Arden Phua, Matthew Sinnott, Dayalan Gunasegaram, Chris Davies
Summary: The new computational model combines DEM and SPH methods to simulate powder flow, melt pool dynamics, and microstructure evolution in powder bed fusion processes, providing a realistic tool for investigating the effects of process parameters on Ti-6Al-4V powder bed microstructure.
Article
Engineering, Geological
Vincent Lemiale, Carolyn Huston, Stuart Mead, David L. J. Alexander, Paul W. Cleary, Deepak Adhikary, Gary W. Delaney
Summary: This paper proposes a methodology for numerically assessing the impact of potential landslides, reducing the number of simulations required through statistical design of experiments. The most important factors influencing landslide extent were determined through a case study, with particle-particle friction coefficient and volume of failing material identified as key factors. A systematic analysis of varying the particle-particle friction coefficient was conducted to better understand the dynamics of collapses.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Biotechnology & Applied Microbiology
Simon M. Harrison, R. Chris Whitton, Susan M. Stover, Jennifer E. Symons, Paul W. Cleary
Summary: This study developed a 3D computational model to simulate the interaction between the equine hoof and racetrack surfaces. The model was validated and calibrated, and a sensitivity analysis revealed the significant effects of track surface parameters on mechanical response. The model accurately simulated hoof-ground interaction and provided insights into the relationship between track surface properties and limb loading in horses.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2022)
Article
Engineering, Mechanical
Dhairya R. Vyas, Sharen J. Cummins, Gary W. Delaney, Murray Rudman, Paul W. Cleary, Devang Khakhar
Summary: This paper presents an extended CollisionalSPH method for modeling elastoplastic collisions. The method is validated and the influence of deformation on history-dependent collision forces is analyzed, showing that deformation, especially with increasing magnitude, affects the contact-zone mechanics.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Chemical
Ri Zhang, Shasha Zhang, Mengyan Ding
Summary: A thin liquid film method is proposed to evaluate sand erosion in annular flow. This method considers the direct interaction between the liquid film and gas core, as well as the entrainment and deposition of droplets. The erosion rate is calculated by considering the effects of liquid entrainment and particle velocity decay. The method is fully verified by comparing with experimental data.
Article
Engineering, Chemical
Yu Suo, Xianheng Su, Wenyuan He, Xiaofei Fu, Zhejun Pan
Summary: This research investigates the mechanical properties of sandstone-shale composite through orthogonal experimental method and discrete element simulation. The results show that different lithologies and thickness ratios can affect the strength and fracture mode of the composite rock samples.
Article
Engineering, Chemical
Maurizio Troiano, Andrea El Hassanin, Roberto Solimene, Alessia Teresa Silvestri, Fabrizio Scala, Antonino Squillace, Piero Salatino
Summary: This study investigates the potential of Fluidized Bed Finishing (FBF) for square flat AlSi10Mg specimens manufactured via Laser-Powder Bed Fusion (L-PBF) additive manufacturing technology. The results show that good finishing can be achieved using rotation-assisted tests, with a maximum reduction of surface roughness by 67%. Steel particles are found to be the most effective bed material.
Review
Engineering, Chemical
Ningbo Song, Wanzhong Yin, Jin Yao
Summary: Seawater's dissolved salts and minerals have various effects on the flotation process, including influencing the characteristics and behavior of flotation factors, as well as affecting the surface of sulfide minerals. In most cases, seawater has adverse effects on the flotation of sulfide minerals, but these effects can be mitigated by adjusting the reagents.
Article
Engineering, Chemical
Kaiqiao Wu, Shuxian Jiang, Victor Francia, Marc-Olivier Coppens
Summary: In rectangular and cylindrical annular fluidized beds, pulsating gas flow can create regular bubble patterns, overcoming challenges seen in conventional units. This study provides new opportunities for modularization of fluidized bed operations.
Article
Engineering, Chemical
Shuo Li, Huili Zhang, Jan Baeyens, Miao Yang, Zehao Li, Yimin Deng
Summary: The paper assesses the behavior of cohesive Geldart C-type particles when fluidized by air with the aid of vibration. It determines that mechanical vibration is a simple and effective method to improve the fluidity of cohesive particles during fluidization.
Article
Engineering, Chemical
Zhenfei Feng, Qingyuan Zhang, Shanpan Liang, Zhenzhou Li, Fangwen Guo, Jinxin Zhang, Ding Yuan
Summary: A new micro/mini-channel heat sink (MCHS) with a combined structure of longitudinal and transverse vortex generators is designed, using Al2O3 nanofluid as the working medium. The study explores the effects of transverse vortex generator shape and longitudinal vortex generator angle on the hydraulic and thermal characteristics, comprehensive performance, entropy generation, and exergy efficiency. The results show that the triangular transverse vortex generator improves the comprehensive performance and exergy efficiency. Combined with the longitudinal vortex generator, the MCHS achieves the best comprehensive performance, entropy generation, and exergy efficiency when the Reynolds number is 742.
Article
Engineering, Chemical
Kostas Giannis, Christoph Thon, Guoqing Yang, Arno Kwade, Carsten Schilde
Summary: This study presents a 3D convolutional neural network (3D-CNN) methodology for generating realistic 3D models of particles. The method trains on 2D projections of particle images to predict their 3D shapes, and evaluates the accuracy of the predictions using Fourier shape descriptors (FSDs). This methodology has wide applications in particle shape analysis.
Article
Engineering, Chemical
Zheng-qing Zhou, Lu-jia Chai, Yu-long Zhang, Ya-bin Wang, Ze-chen Du, Tian-yi Wang, Yu-zhe Liu
Summary: The dynamic oxidation and shell-breaking processes of aluminum nanoparticles (ANPs) during heating were studied using in situ transmission electron microscopy. The results revealed that the changes in shell thickness can be divided into three stages, and the active aluminum content of ANP decreased before shell-breaking.
Article
Engineering, Chemical
Fulei Chen, Huaqing Ma, Zihan Liu, Lianyong Zhou, Yongzhi Zhao
Summary: A particle breakage model based on the particle replacement scheme, using the polyhedral model to describe particles, is proposed in this work to accurately describe the breakage of a large number of particles. Additionally, a fast-cutting algorithm is proposed to reproduce the size distribution of progeny particles determined by the breakage model. The validation and simulation results show satisfactory accuracy, efficiency, and stability of the algorithm.
Review
Engineering, Chemical
Matteo Errigo, Christopher Windows-Yule, Massimiliano Materazzi, Dominik Werner, Paola Lettieri
Summary: Gas-solid fluidized-bed systems have advantages in terms of chemical reaction efficiency and temperature control, making them widely used in industrial applications. However, the design, scale-up, and optimization of these complex units are limited by the lack of deep physical understanding. Non-invasive and non-intrusive diagnostic techniques provide a way for researchers to study these systems without affecting the flow field or directly contacting the medium under study.
Article
Engineering, Chemical
Saeed Fateh, Mohammad Behshad Shafii, Mohammad Najafi, Cyrus Aghanajafi
Summary: Applying a magnetic field to ferrofluids alters their flow characteristics and enhances heat transfer. Through visualization and quantitative investigation, it is found that the magnetic field influences the flow patterns and velocity profiles, improving fluid mixing and vorticity magnitude.
Article
Engineering, Chemical
Lei Gao, Bingbing Wei, Xiaochuan Hu, Zaifeng Yao, Yiwen Fang, Xuejian Gao
Summary: In this study, a numerical model of sand triaxial test was established using discrete element software PFC3D, and an indoor triaxial test was conducted to calibrate the numerical model. The influence of microscopic parameters on the macroscopic mechanical response of sand was analyzed. The results showed that the friction coefficient had the greatest impact on the peak strength and residual strength of the sand's stress-strain curve, and it was positively correlated. The normal tangential stiffness ratio was negatively correlated, while the porosity and boundary flexibility stiffness had minimal influence on it.
Article
Engineering, Chemical
Xuan Liu, Jie Gong, Kai Jiang, Xiaojuan Lai, Yu Tian, Kang Zhang
Summary: This study aimed to improve the performance of lignite coal water slurries (CWSs) by synthesizing a series of three-arm amphiphilic block copolymers. By controlling the relative molecular weight, hydrophilic/hydrophobic ratio, and ionic group content, the apparent viscosity of CWSs was significantly reduced and the static stability was improved. Thermogravimetric testing and XPS analysis were conducted to reveal the mechanism behind the improved performance.
Article
Engineering, Chemical
Lanka Dinushke Weerasiri, Daniel Fabijanic, Subrat Das
Summary: Fluidization at low pressure offers significant benefits for the fine chemical industry. This study investigates the behavior of bubbles and bed expansion under low pressure conditions. It is found that lower pressure leads to larger bubbles, increased bubble quantity, and higher aspect ratio. The predictability is affected by the inhomogeneous fluidization, but low pressure fluidization can generate similar bubble sizes with lower fluidizing mass compared to atmospheric pressure.