Article
Mathematics, Applied
Rodrigo S. Romanus, Alan Lugarini, Admilson T. Franco
Summary: The paper introduces a domain transferring scheme combined with a high-quality algorithm for simulating particle motion in a large domain, disclosing details of mesh generation for ellipsoidal particles and internal mass compensation strategy. The numerical model accurately describes particle rotation and terminal velocity, showing good agreement with analytical results.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2021)
Article
Engineering, Chemical
Shenxu Qin, Maoqiang Jiang, Kuang Ma, Jin Su, Zhaohui Liu
Summary: An efficient immersed boundary-lattice Boltzmann method (IB-LBM) is proposed for fully resolved simulations of suspended solid particles in viscoelastic flows. The method is validated and applied to various scenarios, demonstrating its capability in studying the complex behaviors of viscoelastic particle suspensions.
Article
Thermodynamics
Maoqiang Jiang, Kuang Ma, Jing Li, Zhaohui Liu
Summary: A lattice-Boltzmann model coupled with boundary method is proposed for simulating the combustion of a single char particle. The model considers real varying thermodynamic and transport properties and uses a boundary-thickening based direct forcing-immersed boundary method for implementing boundary conditions. Different reactions are adopted to describe the combustion process. The simulation results show good agreement with previous experimental and numerical results.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Engineering, Chemical
B. Kravets, D. Schulz, R. Jasevicius, S. R. Reinecke, T. Rosemann, H. Kruggel-Emden
Summary: In this study, particle-unresolved simulations were compared to direct numerical simulations using the Lattice-Boltzmann method. By eliminating particle motion, the accuracy of CFD can be examined in detail at the particle scale. The influence of particle shape on numerical accuracy of non-resolved DEM/CFD was studied, particularly focusing on non-spherical particles.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Computer Science, Interdisciplinary Applications
Xuan Ruan, Matthew T. Gorman, Shuiqing Li, Rui Ni
Summary: This paper presents a numerical method for simulating the electrostatic interaction of charged non-spherical particles during collision. The method utilizes the boundary element method (BEM) to resolve the surface charge distribution and employs the generalized minimum residual (GMRES) method with the fast multipole method (FMM) for accelerated computation. The framework is validated through different cases and successfully captures the induced higher-order multipole interaction and contact forces.
JOURNAL OF COMPUTATIONAL PHYSICS
(2022)
Article
Engineering, Chemical
Cihan Ates, Joel Arweiler, Habeb Hadad, Rainer Koch, Hans-Joerg Bauer
Summary: The objective of this study is to investigate the effect of secondary motion of particles in multiphase gas-solid flows and determine the relative impacts of particle shape and orientation information on particle distribution. The study finds that the shape and orientation information strongly affect the force balance for single particles, and the particle distribution in the chamber is significantly changed by the secondary motion of particles. The study also highlights the importance of particle orientation statistics in capturing the particle mixing and segregation patterns at dilute regime.
Article
Engineering, Chemical
Junwu Wang, Peng Zhao, Bidan Zhao
Summary: The study has shown that the current drag correlations underestimate the effective interphase drag force, and the force exerted on a single particle varies significantly even in statistically homogeneous systems. Although the stochastic CFD-DEM method can provide minor improvements, it is still insufficient to bridge the gap between PR-DNS and CFD-DEM simulations, indicating the need for further research and development of a more accurate drag model.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Computer Science, Interdisciplinary Applications
Zihao Cheng, Anthony Wachs
Summary: We propose an immersed boundary/multi-relaxation time lattice Boltzmann method for particle-resolved simulation of particle-laden flows. The method handles the no-slip boundary condition using an explicit feedback immersed boundary method and employs a smoothed discrete delta function and a multi-relaxation time collision operator for improved stability and accuracy. The method is extended to adaptive quadtree/octree grids and implemented in the open-source software Basilisk, achieving high computational efficiency and accuracy in a variety of validation cases.
JOURNAL OF COMPUTATIONAL PHYSICS
(2022)
Article
Environmental Sciences
Fan Yang, Yu-Hong Zeng, Wen-Xin Huai
Summary: Settlement of non-spherical particles in riverine ecosystems is commonly observed and influenced by both particle and fluid properties. By collecting and studying 828 settling data, a new drag law for non-spherical particles has been developed, allowing for the prediction of settling velocity for particles of various shapes and materials. Further applications in hydrochorous propagule dispersal and sediment transport are projected based on a deeper understanding of the settling process.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Mechanics
Vahid Tavanashad, Alberto Passalacqua, Shankar Subramaniam
Summary: This study aims to understand the dynamics of freely evolving particle suspensions across a wide range of particle-to-fluid density ratios, quantifying the average drag force and proposing a correlation for interphase drag force in terms of volume fraction, Reynolds number, and density ratio. The study shows that the effects of particle velocity fluctuations, particle clustering, and particle mobility can impact the drag of freely evolving suspensions in various ways, and highlights the interdependence of particle clustering and particle velocity fluctuations. Two different approaches were used to develop the drag correlation, which can be utilized in computational fluid dynamics simulations to predict overall flow behavior accurately.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2021)
Article
Physics, Mathematical
Arnab Ghosh, Alessandro Gabbana, Herman Wijshoff, Federico Toschi
Summary: The immersed boundary method is an efficient approach for simulating finite-sized solid particles in complex fluid flows. However, it has limitations in simulating light particles, both in terms of accuracy and numerical stability. In this work, we introduce an effective force stabilizing technique to extend the stability range of the method for light particles, pushing down the particle-to-fluid density ratio as low as 0.04. The method is thoroughly validated against experimental and numerical data available in literature.
COMMUNICATIONS IN COMPUTATIONAL PHYSICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Soonpil Kang, Arif Masud
Summary: This paper presents an immersed boundary method for weak enforcement of Dirichlet boundary conditions on immersed surfaces. The method combines the Variational Multiscale Discontinuous Galerkin method and an interface stabilized form. A significant contribution of this work is the analytically derived Lagrange multiplier for weak enforcement of the Dirichlet boundary conditions. Numerical experiments demonstrate the method's effectiveness with different types of meshes, and the norm of the stabilization tensor varies with the flow physics.
JOURNAL OF COMPUTATIONAL PHYSICS
(2022)
Article
Engineering, Chemical
Fengbin Zhang, Yaqun He, Weining Xie, Neng Wei, Jinlong Li, Shuai Wang, Jie Wang
Summary: Drag coefficients of irregular particles were investigated by studying the effects of particle surface roughness, volume fraction, and interactions using 3D reconstruction and PR-DNS. A model based on shape parameters accurately explained the variations in drag coefficients. Two new models were proposed for predicting drag coefficients of irregular particles. The models have high applicability and consider the influence of particle volume fraction.
Article
Mechanics
Debajyoti Kumar, Somnath Roy
Summary: This paper investigates the impact of surface roughness on forces over a cylinder and vortex patterns at low Reynolds numbers. The study uses a novel immersed boundary method to capture small recirculation zones trapped inside roughness elements on the cylinder surface. The results show that the presence of vortices significantly reduces skin-friction drag, and higher roughness height leads to better lock-in phenomena at lower oscillation frequencies. However, the shedding modes of the vortices are not sensitive to surface roughness.
Article
Mathematics, Interdisciplinary Applications
Haocheng Chang, Airong Chen, Baixue Ge
Summary: This paper presents a non-local Eulerian particle method coupled with an immersed boundary method for fluid-structure interaction problems. The Eulerian particle method transforms the partial differential equations into integral forms using peridynamic differential operator. Symmetric particle distribution is applied to enhance the efficiency and stability of the algorithm. By introducing the immersed boundary method into the original Eulerian particle method, a new coupling method is obtained that can solve problems with moving bodies inside fluid. The proposed method is applied to three benchmark problems, demonstrating its stability and accuracy.
COMPUTATIONAL PARTICLE MECHANICS
(2023)
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.