Article
Engineering, Chemical
Zhijian Zuo, Xintao Chen, Shuguang Gong, Guilan Xie
Summary: DEM simulations were used to study the mixing performance of particles with different densities in a bladed mixer. It was found that the decrease in density ratio and filling level can improve mixing performance, while an increase in blade speed can also improve mixing performance.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Engineering, Chemical
Gul Niamat Shah, Muhammad Shafiq Siraj
Summary: This study investigated the mixing characteristics of dry and wet granular flows inside a vertical cylindrical mixer using numerical simulations. The effects of blade rake angle and moisture content on mixing efficiency were analyzed, revealing that a two-bladed mixer is more suitable for mixing at certain moisture contents compared to a four-bladed mixer.Various factors such as blade design and moisture content need to be carefully considered for specific applications.
PARTICULATE SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Chemical
Jieqing Gan, Zongyan Zhou, Aibing Yu
Summary: This paper presents a numerical study of the mixing of ellipsoidal particles in a bladed mixer using the discrete element method. The results show that oblate ellipsoids have poorer mixing quality and lower mixing rates compared to spheres and prolate ellipsoids. Spheres generally mix faster than ellipsoids, and ellipsoids demonstrate higher average velocity and friction forces than spheres. The study also investigates the effect of sliding friction on mixing rate, particle velocities, and blade torque, indicating a significant relationship between particle shape, sliding friction, and energy consumption.
Article
Engineering, Chemical
Jiecai Long, Can Wang, Jingzhen Zhu, Xiaobin Zhan, Zhibin Sun, Baojun Shen, Xiwen Li
Summary: This study characterizes the mixing performances and power consumption of a twin-blade planetary mixer with non-cohesive particles using the discrete element method (DEM). The DEM model was experimentally verified for simulating particle flow and mixing kinetics. Results show that particle mixing is achieved through radial, circumferential, and vertical circulations, as well as local collisions and mergers. Increasing the absolute speed and speed ratio enhances the circulation and mixing performance but increases power consumption. The swept volume of blades plays a significant role in the mixing performance.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Green & Sustainable Science & Technology
Martin Trasch, Nidiana Rosado-Hau, Camil Matoug, Mael Arhant, Vincent Perier, Benoit Augier, Michel Repecaud
Summary: In this paper, the 10 kW WindQuest Vertical Axis Wind Turbine (VAWT) was tested with strain gauges to study the effects of the blades' structural dynamic response under operating conditions. The analysis examined the gravitational, inertial, and aerodynamic loading components on the blades' bending stress. The study also identified the dynamic stall effect and system eigenfrequencies excited by the wind and the structure's motion.
JOURNAL OF RENEWABLE AND SUSTAINABLE ENERGY
(2023)
Article
Engineering, Chemical
Kwon Joong Son
Summary: This study presents numerical simulations of planetary mixing of polymeric fluids using the SPH method, revealing the mixing mechanics and mixing index evolution characteristics under different operating conditions.
Article
Engineering, Chemical
Zhijian Zuo, Shuguang Gong, Guilan Xie, Jianping Zhang
Summary: DEM simulations were used to study binary mixing of particles with different densities, revealing that residence time increases with particle density and mean velocity fluctuation increases with impeller speed. Moreover, trajectory radius and vertical movement in the impeller influence area also increase with impeller speed.
Article
Green & Sustainable Science & Technology
Lijun Zhang, Jiawei Gu, Huaibao Zhu, Kuoliang Hu, Xiang Li, Liuyang Jiao, Junjie Miao, Jing Liu, Zhiwei Wang
Summary: The pitch angle significantly affects the performance of VAWT, with adjustments leading to performance improvements, particularly evident when the angle delta is 0 degrees.
Article
Engineering, Chemical
Hamed Hoorijani, Behrad Esgandari, Reza Zarghami, Rahmat Sotudeh-Gharebagh, Navid Mostoufi
Summary: This study presents numerical simulations of super-ellipsoid particles in a four-bladed mixer using the discrete element method. The effect of several factors on the mixer's performance, including the number of particles, blade rake angle, and impeller rotation speed, was examined. Mixing mechanism and flow pattern were analyzed through various parameters such as velocity profiles, particle trajectories, and granular temperature. The study revealed that spherical particles have a faster mixing rate compared to prolate and oblate particles, and acute blade rake angles result in slower mixing than obtuse angles. Regression models were employed to predict mixing time, and the voting regressor model showed success in this regard.
Article
Engineering, Chemical
Zhijian Zuo, Jiajie Wang, Shuguang Gong, Jianping Zhang
Summary: DEM simulations were conducted to study the influence of blade configuration and impeller speed on particle dynamics and mixing performance in an intensive mixer. The study found that the blade configuration affects particle trajectory, residence time, and mixing performance, with the thread blade mixer showing lower velocity, longer residence time, and better mixing performance. Therefore, the proper impeller speed is crucial for particle mixing in the intensive mixer, with the optimal speed being 150 rpm.
PARTICULATE SCIENCE AND TECHNOLOGY
(2023)
Article
Thermodynamics
Yanfeng Zhang, Qing'an Li, Xinyu Zhu, Xiaowen Song, Chang Cai, Teng Zhou, Yasunari Kamada, Takao Maeda, Ye Wang, Zhiping Guo
Summary: This paper investigates the flow field and vortex characteristics of a straight-bladed vertical axis wind turbine (VAWT) using Particle Image Velocimetry technique and wind tunnel experiments. The study compares the results between numerical simulations and experiments to assess the flow field of VAWT with bionic blades. The research finds that the bionic blades can suppress the influence of the tip vortex and have a lower wake recovery velocity compared to the baseline blades. The study also shows that the bionic blades have slightly better aerodynamic performance in certain azimuth angle regions.
Article
Energy & Fuels
Bruce LeBlanc, Carlos Ferreira
Summary: This paper investigates the flow fields and aerodynamic loading of a two-bladed H-type vertical axis wind turbine with active variable pitch for load and circulation control. Using Particle Image Velocimetry, flow fields at different azimuthal positions of the blades during operation were captured, providing insight into phenomena such as dynamic stall and tower shadow. The results demonstrate the impact of load shifting from the upwind to downwind region using pitch control, as well as the effects of dynamic stall on the blades, while also serving as a unique database for model validation.
Article
Chemistry, Multidisciplinary
Jia Guo, Timing Qu, Liping Lei
Summary: The study investigates the impact of two pitch parameters on the performance of a straight-bladed VAWT. Results show that the fold angle significantly affects the angles of attack and forces of the blades, while the incline angle leads to an asymmetric distribution of aerodynamic forces, reducing loads on the main shaft and tower of VAWTs.
APPLIED SCIENCES-BASEL
(2021)
Article
Multidisciplinary Sciences
Milad Babadi Soultanzadeh, Alireza Moradi
Summary: The study investigates the impact of pitch angle on the aerodynamic performance of high-solidity VAWT, showing a 25% increase in maximum COP with an increase in pitch angle. Higher accuracy can be achieved at lower tip speed ratios for both pitch angles.
SN APPLIED SCIENCES
(2021)
Article
Engineering, Chemical
G. R. Chandratilleke, X. Jin, Y. S. Shen
Summary: The study uses the discrete element method to investigate the effects of particle size and density on mixing in ribbon mixers. Results show that mixing rate generally slows down with reduced particle size at a given density. The impeller torque is also influenced by particle size and density.
Article
Engineering, Chemical
Jieqing Gan, Zongyan Zhou, Aibing Yu
Summary: This paper presents a numerical study of the mixing of ellipsoidal particles in a bladed mixer using the discrete element method. The results show that oblate ellipsoids have poorer mixing quality and lower mixing rates compared to spheres and prolate ellipsoids. Spheres generally mix faster than ellipsoids, and ellipsoids demonstrate higher average velocity and friction forces than spheres. The study also investigates the effect of sliding friction on mixing rate, particle velocities, and blade torque, indicating a significant relationship between particle shape, sliding friction, and energy consumption.
Article
Engineering, Chemical
Erlei Li, Zongyan Zhou, Lin Wang, Haopeng Shen, Ruiping Zou, Aibing Yu
Summary: This study employs a validated mathematical model to assess the influence of material properties on the selective laser melting process. The results indicate that the solidification rate and mushy zone constant have a significant impact on the formation of pores and surface defects.
Article
Engineering, Chemical
Lin Wang, Zongyan Zhou, Erlei Li, Haopeng Shen, Aibing Yu
Summary: The study utilized the discrete element method to investigate the mechanisms affecting powder deposition efficiency during powder spreading in powder bed fusion additive manufacturing. It was found that factors such as powder flow, transient jamming, forces on the underlying part, and spreader shape all play a crucial role in determining the efficiency of powder deposition.
Article
Engineering, Chemical
Erlei Li, Zongyan Zhou, Lin Wang, Ruiping Zou, Aibing Yu
Summary: This study addresses and quantifies the dynamics of keyholes in the laser powder bed fusion (LPBF) process, specifically focusing on the driving forces of surface tension, Marangoni force, and recoil pressure. Through modeling the melt pool dynamics, the complete life cycle of keyholes, including formation, drilling, fluctuation, and disappearance, is captured. The study reveals that pores in the keyholes originate from powder bed voids, ejected keyhole protrusions, and gas bubbles eroded by the liquid at the end of the track. The presence of an anticlockwise vortex at the rear of the melt pool and the clockwise path of molten liquid ahead of the melt pool are observed. The fluctuation in the depth of keyholes is attributed to the variation in the powder layer thickness, which breaks the force equilibrium on the keyhole rim. The compressed rear keyhole is predominantly controlled by surface tension, while the expanded front rim is influenced by recoil pressure.
Article
Engineering, Chemical
Noor Ilyana Ismail, Shibo Kuang, Yechen Tang, Aibing Yu
Summary: This paper presents a comprehensive evaluation of premium square mesh screens, wire-wrapped screens, and modified wire-wrapped screens with converging slots. The results show that the premium square mesh screens outperform the wire-wrapped screens, and it is the best choice for achieving uniform sand retention modes and stable bridging.
Article
Engineering, Chemical
Reza Amirifar, Kejun Dong, Aibing Yu
Summary: The packing structure of granular materials is crucial to their performance. This paper presents a method to design containers to promote ordered packings and demonstrates the self-assembly and high-density packing of granular spheres in a specific container. It also suggests that the method can be effective for densification under vibration.
Article
Engineering, Chemical
Noor Ilyana Ismail, Shibo Kuang, Enzu Zheng, Aibing Yu
Summary: This numerical study focuses on the sand retention process over premium square mesh screens, considering the effect of fluid rheology. The results show that increasing the flow behavior index or consistency index decreases sand production, while increasing temperature increases sand production. This is attributed to changes in fluid viscosity and particle concentration.
Article
Engineering, Chemical
Jieqing Gan, Zongyan Zhou, Aibing Yu, Dean Ellis, Reece Attwood, Wei Chen
Summary: Multibody dynamics (MBD) simulation is a useful tool for analyzing the kinematic function of multibody systems, while discrete element method (DEM) is commonly used for simulating particle flows and overall processes. Combining MBD and DEM methods through functional mock-up interface (FMI) co-simulation can predict equipment performance by considering both material and equipment behavior. This study utilized Dymola software to perform MBD and FMI co-simulations, developing MBD models for a hydraulic excavator system and GPU-based DEM models for excavator digging cycles. The results demonstrated the significant impact of solid materials on excavator movement.
Article
Engineering, Chemical
Lingling Liu, Shibo Kuang, Baoyu Guo, Aibing Yu
Summary: Optimization of ironmaking blast furnaces involves considering bottom and top operations. A recently developed integrated BF model and numerical orthogonal experiments are used to predict BF performance indicators and conduct multi-objective optimization and operatable zone identification.
CHEMIE INGENIEUR TECHNIK
(2023)
Article
Energy & Fuels
Lingling Liu, Shibo Kuang, Baoyu Guo, Aibing Yu
Summary: Oxygen blast furnace (OBF) is a low carbon ironmaking technology that suffers from high gas flame temperature. Injecting COREX off-gas (CROG) into the industrial BF can improve coal combustion and overall performance. The optimum injection rate of CROG helps achieve better fuel economy by enhancing indirect reduction and coke combustion.
Article
Engineering, Chemical
E. Dianyu, Haihan Fan, Zhongfang Su, Guangtai Xu, Ruiping Zou, Aibing Yu, Shibo Kuang
Summary: This paper proposes a hydrocyclone with a tapered inlet design to reduce the influence of particles misplacement. The new hydrocyclone integrates the advantages of both spiral inlet and tangential inlet. Through the analysis of separation performance, flow characteristics, and volume fraction distributions, an optimum design is identified. Compared to a standard hydrocyclone, the new design significantly improves tangential velocities, expands the locus of zero vertical velocity, and achieves more stable air core, symmetric radial and axial velocity distributions, as well as reduced eddy flow and short-circuit flow. This study offers a new perspective for improving hydrocyclone flows and performance.
Article
Chemistry, Multidisciplinary
Yang Zhang, Danjiao Zhao, Lei Cao, Lanlan Fan, Aiping Lin, Shufen Wang, Feng Gu, Aibing Yu
Summary: Flexible strain sensors are crucial for public healthcare as they can noninvasively monitor vital health signals. In this study, we developed structurally integrated 3D conductive networks-based flexible strain sensors using a droplet-based aerosol jet printing process and a transfer process. The sensors showed enhanced conduction and mechanical properties during stretching, and demonstrated effective responses to human movements such as finger bending and arm bending. Our findings highlight the potential of droplet-based aerosol jet printing for advanced flexible devices in optoelectronics and wearable electronics applications.
Article
Engineering, Chemical
Yifan Qin, Xiao Dong Chen, Aibing Yu, Jie Xiao
Summary: Mathematical modeling of mass transfer and absorption in the small intestine is challenging and requires a reliable and computationally efficient predictive model. This study derives an absorption model that considers the 3D intestinal inner wall structure and can be used in a 1D distributed model. Computational fluid dynamics simulations are used to quantify the mass-transfer coefficient. The model provides insights into the influence of intestinal morphology and motility on mass transfer and absorption.
Article
Energy & Fuels
E. Dianyu, Peng Zhou, Langyong Ji, Jiaxin Cui, Qiang Xu, Liejin Guo, Aibing Yu
Summary: In this study, a validated CFD-DEM model is used to investigate the dynamics, microstructure, and thermochemical behaviors in the raceway of a blast furnace with hydrogen injection operations. The effects of hydrogen injection concentration on raceway size, gas temperature, and components are studied.
Article
Pharmacology & Pharmacy
Hao Miao, Ke Huang, Yingwen Li, Renjie Li, Xudong Zhou, Jingyu Shi, Zhenbo Tong, Zhenhua Sun, Aibing Yu
Summary: In this study, the LNP formulation, atomization methods, and buffer system were optimized to maintain stability and efficiency of mRNA encapsulated LNPs during the atomization process. A suitable LNP formulation for atomization, AX4, DSPC, cholesterol, and DMG-PEG2K at a 35/16/46.5/2.5 (%) molar ratio, was identified based on in vitro experiments. Soft mist inhaler (SMI) was found to be the most suitable method for pulmonary delivery of mRNA encapsulated LNPs. The physico-chemical properties of the LNPs, such as size and entrapment efficiency, were further improved by adjusting the buffer system with trehalose. In vivo fluorescence imaging of mice demonstrated the potential of SMI with proper LNPs design and buffer system for inhaled mRNA-LNP therapies.
INTERNATIONAL JOURNAL OF PHARMACEUTICS
(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.
