Article
Mechanics
Dhananjay Kumar, Harshad Sanjay Gaikwad, P. Kaushik, Pranab Kumar Mondal
Summary: In this study, we investigated the mixing of constituent components transported through a narrow fluidic cylindrical channel in a swirling flow environment using numerical simulation and analytical solution. The results show that inlet swirl significantly enhances the mixing efficiency and advection dominates at higher Reynolds numbers. This research provides important guidance for the optimization design of fluid mixing.
Article
Engineering, Chemical
Humair Nadeem, Shankar Subramaniam, Nandkishor K. Nere, Theodore J. Heindel
Summary: A novel particle neighborhood based mixing index, called the generalized nearest neighbor (GNN) mixing index, is developed to measure solids mixing at the particle scale. The GNN index is statistically robust and grid-independent, providing reliable particle scale mixture homogeneity values. It can be adapted to mixtures of unequal proportions or mixtures containing more than two species.
ADVANCED POWDER TECHNOLOGY
(2023)
Article
Engineering, Chemical
Zhijian Zuo, Shuguang Gong, Guilan Xie
Summary: The study utilized the discrete element method (DEM) to simulate the particle mixing process in an intensive mixer and investigated the impact of structural and process parameters on mixing performance and power consumption. Results indicated that mixing performance and energy efficiency improve with decreasing impeller offset, while a decrease in filling level also enhances energy efficiency and mixing performance.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2021)
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
Clara Hartmanshenn, Madeline Halota, Prin Chaksmithanont, Carlin Leung, Johannes G. Khinast, Charles D. Papageorgiou, Christopher Mitchell, Justin L. Quon, Benjamin J. Glasser
Summary: The study found that the heating time of particle beds in heated bladed mixers depends on the relationship between the fill level, mixer diameter, and the heating area relative to material amount, as well as bed compression and mixing rate.
Article
Engineering, Chemical
Angga Pratama Herman, Jieqing Gan, Zongyan Zhou, Aibing Yu
Summary: This work presents a numerical study on particle mixing and scale-up of ribbon mixers with different sizes. The study found that as the mixer size increases, the mixing performance worsens. A correlation is proposed to predict the mixing rate based on the scale-up ratio and Froude number. It was observed that the top-bottom loading condition leads to faster mixing compared to the side-side and front-back loading conditions. Additionally, the total mixing time increases significantly with larger mixer sizes. The power consumption per unit mass follows a specific order among the four mixers. The study suggests that scale-up is necessary to save time and power consumption, as well as reduce operating costs.
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
Engineering, Chemical
Chow-Shing Shin, Patrice L. Baldeck, Yung-Mau Nie, Yi-Hsiung Lee, Zheng-Da Lin, Chia-Chin Chiang, Chih-Lang Lin
Summary: A single 3D multi-manifold micromixer composed of a double Archimedes screw was developed for rapidly mixing within a short distance; Numerical simulations showed satisfactory mixing efficiency can be achieved at a distance of approximately twice the microchannel width; Experimental demonstration by an ASM fabricated by two-photon stereolithography showed good agreement with simulation findings.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2021)
Article
Mechanics
Xinjun Cui, Matthew Harris, Martin Howarth, Daisy Zealey, Reegan Brown, Jonny Shepherd
Summary: Shock waves and granular vacua play a crucial role in studying the behavior of granular materials, showing significant changes in flow properties and the emergence of solid-liquid-gas behaviors. Through experiments and numerical simulations, it is observed that the granular shock wave can induce a solid-liquid-gas behavior as the flow propagates downstream, extending the shock region and exhibiting strong liquid and gas behavior.
Article
Engineering, Chemical
Shahab Golshan, Bruno Blais
Summary: The research focused on granular mixing in vertical ribbon mixers using discrete element method simulations. It was found that decreasing the mixer height strengthens the azimuthal motion of particles. Increasing rotation speed and inserting powder side-to-side improved mixing quality.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Thermodynamics
A. Talhaoui, B. Draoui, A. Youcefi
Summary: This study numerically investigated laminar flow and mixing behavior of incompressible Newtonian fluids in different modified mixer configurations using CFD simulations. Increasing the diameter aspect ratio was found to improve mixing efficiency and reduce pressure drop.
JOURNAL OF APPLIED FLUID MECHANICS
(2021)
Article
Engineering, Chemical
Zhijian Zuo, Shuguang Gong, Guilan Xie, Jianping Zhang
Summary: The study used discrete element method to evaluate the impact of process parameters on granular mixing performance in an intensive mixer, finding that factors such as filling ratio, impeller speed, and vessel speed have significant effects on coordination number, relative standard deviation, and relative standard deviation at a specified input work. Additionally, interactive effects were observed among filling rate, impeller speed, and vessel speed on all presented responses.
Article
Computer Science, Interdisciplinary Applications
Mohammad Nikooei, Mehrdad T. Manzari
Summary: This paper numerically studies the interaction of flowing granular material with an entrainable granular bed, and characterizes the rheological behavior of the granular mixture using a generalized viscoplastic model. The effect of dynamics of entrained bedtype particles on rheology is considered, with discretization of flow equations using Incompressible Smoothed Particle Hydrodynamics method. Benchmark problems are solved to assess accuracy, and the impact of mixing effect on various model parameters is studied, with reported variations in momentum, velocity, and total kinetic energy of flow with time.
COMPUTERS & GEOSCIENCES
(2021)
Article
Construction & Building Technology
Julio Lopes da Silva, Alberto Casado Lordsleem Jr
Summary: This study aimed to analyze the impact of different mortar mixers and mixing times on the properties of industrial mortars in both fresh and hardened states. The results showed that variations in mixing time and types of mixers can influence the properties of industrial mortars significantly. Testing in both fresh and hardened states is necessary to fully understand the effects of the preparation phase on mortar properties.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2021)
Article
Engineering, Aerospace
Hengtao Shi
Summary: The study developed a geometry design method for high performance axial compressors using normalization and subsection techniques, which features flexibility and local adjustability for the blade geometry performance.
Article
Energy & Fuels
Jun Wang, Jiangting Wang, Guisheng Zhu, Huarui Xu, Xiuyun Zhang, Yunyun Zhao, Jian Zhang, Kunpeng Jiang, Aibing Yu
Summary: The foam-structured NiCo2S4 (FSNCS) material was successfully synthesized with the addition of SiO2 nanospheres as the framework, leading to reduced dead volume. The FSNCS exhibited high capacity and energy density in the supercapacitor, along with good cyclic life.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Engineering, Chemical
Liuyimei Yang, Qijun Zheng, Aibing Yu
Summary: This article proposes a continuum-based model for the process of blending powders using stirring blades. The model accurately describes the tempo-spatial distribution of small/large particles in the stirring process and captures the various intricate effects of blade parameters. It shows promise for optimizing blade mixers in industries.
Article
Engineering, Environmental
Qinwen Liu, Wenqi Zhong, Aibing Yu, Chi-Hwa Wang
Summary: Successful realization of stable, pressurized, and oxy-fuel combustion mode with coal and biomass mixtures as fuels in fluidized bed. Increasing combustion pressure and biomass blending ratio not only benefits better temperature distribution, more CO2 enrichment in flue gas, and higher combustion efficiency, but also reduces NOx and SO2 emissions.
CHEMICAL ENGINEERING JOURNAL
(2022)
Review
Engineering, Chemical
Huibin Xu, Weiyu Wang, Chi Ma, Wenqi Zhong, Aibing Yu
Summary: This article reviews the recent studies on the fluidization characteristics of wet particles in fluidized beds and spouted beds, including physical experiments and numerical simulations. The findings of these studies are important for the industrial applications of wet particle fluidization, aiding in the scale-up, design, and optimization of processes. The focus of the physical experiments is on the development of new measurement methods and related findings, while the focus of the numerical simulations is on the development of discrete element method (DEM) to provide new insights into wet particle fluidization at the particle scale. The challenges and needs for future research on wet particle fluidization are also discussed.
Article
Engineering, Chemical
Qing Ye, Peibo Duan, Shibo Kuang, Li Ji, Ruiping Zou, Aibing Yu
Summary: This paper presents a cost-effective method to optimize hydrocyclones used for particle separation. It integrates a mechanistic model with data-driven models to achieve reliable prediction and optimization. The method demonstrates its applicability by successfully optimizing the hydrocyclone geometry for low pressure drop and accurate particle separation, especially for fine particles.
Article
Engineering, Manufacturing
Erlei Li, Zongyan Zhou, Lin Wang, Ruiping Zou, Aibing Yu
Summary: Through modeling, this study explored the relationship between pore formation and the dynamics of melt pool and gas bubbles in the laser powder bed fusion (LPBF) process. The results showed that the molten liquid near the gas-liquid interface flows centrifugally, generating clockwise and anticlockwise vortices. Gas bubbles originating from the powder bed voids follow the melt pool flow and can either escape or remain as pores in the solidified part.
ADDITIVE MANUFACTURING
(2022)
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, Environmental
Minshu Zhan, Jun He, Baoyu Guo, Lihua Liu, Aibing Yu
Summary: This study proposes an Eulerian-Eulerian multiphase model based on CFD to simulate the physico-chemical behavior in the OVD process. It successfully captures the transport phenomena and provides a deep understanding of the growth and deposition mechanisms of SiO2 in the OVD process.
CHEMICAL ENGINEERING JOURNAL
(2022)
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)