Article
Engineering, Chemical
M. C. Richter, A. N. Mainza, I. Govender, N. Mangadoddy, R. Sivakumar, G. E. Sreedhar, M. R. van Heerden
Summary: This study focuses on tracking near-gravity material radioactive tracers using positron emission particle tracking technology in order to study the separation performance of dense media cyclones. The study finds that the near-gravity phase of coal causes separation inefficiencies, which makes coal processing difficult.
Article
Engineering, Chemical
Mayank Kumar, Narasimha Mangadoddy, R. Banerjee, Gaekwad E. Sreedhar, Shiv Kumar Raparla, Rajan Kumar
Summary: An open source high fidelity LES based algebraic slip mixture multiphase flow solver was developed to tackle the high compute cost of multiphase simulations for dense medium cyclones, achieving a significant speed up on a general purpose GPU compared to a CPU implementation. The performance of the solver was validated with experimental results, and the implications of key operating variables on DMC operation were studied, providing insights into the medium segregation based on force analysis. The response of the DMC in terms of hydrodynamic force analysis and density differential with varying design and operating variables was discussed, suggesting that a lower pressure head is preferred for DMCs used in mineral processing.
MINERALS ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Tenglong Su, Yifei Zhang
Summary: This paper investigates the effect of the inserted solid rod on the separation process of the hydrocyclone using experimental validation and numerical simulation. The results show that the variable diameter inserted solid rod can inhibit the air core and improve separation performance.
Article
Geochemistry & Geophysics
Chao Ni, Guangqian Xu, Jing Chang, Bo Liu
Summary: The separation of fine coal using dense medium cyclone (DMC) has high economic potential, but its industrial application faces challenges. This research analyzes particle settling behavior in a dense medium cyclone and provides guidance for improving separation efficiency.
Article
Energy & Fuels
Long Zhao, Lubin Wei, Xueshuai Zhu, Junli Liu, Jingying Wu
Summary: This paper studies the influencing factors of the dynamic stability of 1.30-1.60 g/cm(3) dense medium suspension, and proposes a formula for calculating the density difference characteristic value of the suspension.
INTERNATIONAL JOURNAL OF COAL PREPARATION AND UTILIZATION
(2023)
Article
Mechanics
Rashmi Ramadugu, Prasad Perlekar, Rama Govindarajan
Summary: The dynamics of an initially flat interface between two immiscible fluids with a vortex on it is studied. It is found that surface tension causes vorticity generation at a curved interface, resulting in a velocity jump and the Kelvin-Helmholtz instability. The instability is observed within the vortex core, destroying the flow structure, and is also influenced by the density difference between the fluids.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Chemistry, Multidisciplinary
Yanxia Xu, Junxiang Ye, Xingfu Song, Jianguo Yu
Summary: Ultrafine particle classification can be achieved using hydrocyclones with novel structures. Computational fluid dynamics simulations were performed to optimize the design, and a hydrocyclone combining an arc inlet and a 30 degrees cone angle showed promising results in removing fine particles and recovering coarse particles. A 3D-printed hydrocyclone with the same design exhibited superior classification performance compared to a conventional hydrocyclone when classifying ultrafine MnO2 particles.
Article
Engineering, Chemical
Felipe Queiroz Mendes, Dirceu Noriler
Summary: This study proposes a new numerical simulation method to predict the efficiency curve of cyclone separators by calculating the characteristic diameter. Simulations were conducted for different cases and compared with experimental data, demonstrating the accuracy and feasibility of the proposed model.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Computer Science, Interdisciplinary Applications
Everett A. Wenzel, Marco Arienti
Summary: This paper presents a method for simulating evaporation in a compressible, interface-resolved framework. The method ensures consistent mass and thermal energy transport at the phase interface, conserves mass, momentum, and energy, and can model compressible and incompressible systems. Verification and validation tests are performed, and the method is shown to be accurate and efficient in studying phase change in engineering systems.
JOURNAL OF COMPUTATIONAL PHYSICS
(2023)
Article
Thermodynamics
Mariana M. Grigoleto, Carlos L. Bassani, Marco G. Conte, Cristiane Cozin, Fausto A. Barbuto, Rigoberto E. M. Morales
Summary: A new set of equations for predicting the temperature distribution of gas-liquid slug flows is proposed, avoiding non-physical oscillations found in previous equations. The temperature is now assigned to the whole unit cell instead of each structure individually. Comparison with experimental data showed deviations of +/- 25% for temperature and pressure gradients.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Engineering, Chemical
Yuge Yao, Manxia Shang, Zhong Huang, Tuo Zhou, Man Zhang, Hairui Yang, Junfu Lyu
Summary: This study investigates the effects of inlet duct length on the performance of dense medium cyclones. Experimental measurements and numerical simulations show that a longer inlet duct length can reduce static pressure drop and improve separation efficiency. The simulations also reveal that increasing the inlet duct length helps decrease gas swirling loss and enhance separation performance.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Water Resources
Gege Wen, Catherine Hay, Sally M. Benson
Summary: Numerical simulation is crucial for subsurface flow and transport applications, but often faces computational challenges. CCSNet is a deep-learning modeling suite that provides faster results for carbon capture and storage problems compared to conventional numerical simulators.
ADVANCES IN WATER RESOURCES
(2021)
Article
Engineering, Chemical
Zhaoyang Li, Kaiwei Chu, Zongqing Zhou, Yixiong Feng, Aimin Wang
Summary: In this study, the effect of M:C ratio on the performance of dense medium cyclone (DMC) under practical conditions was numerically investigated using a combined approach of computational fluid dynamics (CFD) and discrete element method (DEM). The study found that the M:C ratio significantly affects DMC performance under constant pressure, and the specific effect depends on coal washability.
Article
Energy & Fuels
Mohammad Zandie, Alireza Kazemi, Mohammad Ahmadi, Mostafa Keshavarz Moraveji
Summary: Hydro cyclones are widely used in various industrial fields for their high separation efficiency, durability, but the presence of gas core in de-oiling hydro cyclones is a major obstacle to their application.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Mechanics
Fang Li, Xie-Yuan Yin, Xie-Zhen Yin
Summary: This study investigates small-amplitude shape oscillations of a viscous compound droplet suspended in a viscous host fluid. The dominant l = 2 mode and the existence of in-phase and out-of-phase oscillatory modes are identified. Various non-dimensional parameters are examined, and the effects of viscosity, density contrasts, and shell thickness on the oscillations are analyzed. The study also discusses the critical values and bifurcations that lead to aperiodic behavior in the droplet oscillations.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Engineering, Chemical
Qinwen Liu, Wenqi Zhong, Aibing Yu, Chi-Hwa Wang
Summary: With the improvement of the models for oxy-fuel co-firing, the adaptability of the models to the oxy-fuel atmosphere can be enhanced, and the accurate prediction of NO, N2O, SO2 emissions can be achieved. This study also provided valuable information for the design and operation control of oxy-fuel co-firing of coal and biomass in a fluidized bed.
Article
Engineering, Chemical
Haishan Miao, Hao Zhang, Xizhong An, Chunhai Ke, Aibing Yu
Summary: This study investigates the combined effect of particle shape and porosity on the momentum and heat transfer of granular matter under laminar flow. It is found that particle shape, characterized by aspect ratio, plays a dominant role in affecting the drag coefficient and Nusselt number, while the influence of porosity becomes significant under high Reynolds number conditions.
Article
Engineering, Chemical
Ying Cui, Wenqi Zhong, Zongyan Zhou, Aibing Yu, Xuejiao Liu, Jun Xiang
Summary: This study investigates the combustion process and heat transfer characteristics of the supercritical CO2 (S-CO2) power cycle in a circulating fluidized bed (CFB) using computational fluid dynamics (CFD) simulation and multiphase particle-in-cell (MP-PIC) method. A novel method using Radial Base Function (RBF) neural network for predicting simulation results is proposed to improve the prediction accuracy. The findings are significant for the design and optimization of S-CO2 CFB boilers.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Haiqi Nie, Aibing Yu, Lulu Jiao, Xiaoming Mao, Haifa Xu, Shibo Kuang
Summary: This study systematically investigates the effects of shaft gas injection on an oxygen blast furnace and finds that the fuel consumption decreases with increasing oxygen enrichment and shaft gas injection rate/temperature, while it increases less significantly at a higher injection position. When the oxygen enrichment is high or the shaft gas injection position/rate is low, the shaft injected gas can better replace coke, leading to improved utilization.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2022)
Article
Engineering, Chemical
Zeyu Li, Zhenbo Tong, Aibing Yu, Hao Miao, Kaiwei Chu, Hao Zhang, Gang Guo, Jiang Chen
Summary: Hydrogen utilization is gaining attention and the supercritical water circulating fluidized bed reactor can generate hydrogen. This study uses CFD to analyze cyclone separation mechanisms under supercritical fluid, finding that changing the content of carbon dioxide and adding extra dipleg can improve cyclone performance.
Article
Thermodynamics
Haishan Miao, Hao Zhang, Xizhong An, Jiang Chen, Aibing Yu
Summary: This study investigates the distribution of drag coefficient (Cd) and average Nusselt number (Nu) of a porous spheroid in a fluid under different conditions using particle-resolved direct numerical simulations. The results show that the shape, Reynolds number, and porosity have noticeable effects on Cd and Nu, and there are certain trends in their variations within certain ranges. Predictive correlations are established based on the numerical data, which can be used to improve multiphase models and computational fluid dynamics methods.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Materials Science, Multidisciplinary
Jing Li, Shibo Kuang, Ruiping Zou, Aibing Yu
Summary: The study examines the effects of peripheral opening extent and shaft-injected hydrogen flow rate on the performance of a hydrogen blast furnace using computational fluid dynamics. Increasing the peripheral opening extent hinders the pre-reduction and pre-heating roles of shaft-injected hydrogen, but improves the CO indirect reduction rate. Increasing the shaft-injected hydrogen flow rate slows down the CO indirect reduction rate but enhances the H-2 indirect reduction rate.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(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, 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)
