Article
Energy & Fuels
Xin Yang, Hao Zhou, Hao Wu
Summary: A dynamic CFD model with conjugate heat transfer is developed to predict the effect of multiple operation conditions on ash deposition. The model considers particle sticking and erosion, and achieves stable dynamic mesh morphing using a smoothing method. The results show good agreement with experimental observations, and suggest that coarse particles reduce the deposition rate caused by smaller particles via erosion.
Article
Chemistry, Multidisciplinary
Thokozane Justin Kunene, Lagouge Kwanda Tartibu, Sina Karimzadeh, Peter Ozaveshe Oviroh, Kingsley Ukoba, Tien-Chien Jen
Summary: This study focuses on the atomic scale growth dynamics and structural relaxation of amorphous Al2O3 films. By using molecular dynamics (MD) simulations, the sticking coefficient obtained is consistent with experimental measurements.
APPLIED SCIENCES-BASEL
(2022)
Article
Multidisciplinary Sciences
Maryam Hashemi, Mehran Minbashi, Seyed Mohammad Bagher Ghorashi, Arash Ghobadi
Summary: This study investigates the use of In2S3 thin films as an electron transport layer in CuBaSn(S, Se)-CBT(S, Se) solar cells, showing that In2S3 is a suitable alternative to toxic CdS. The properties of In2S3 have been evaluated to screen different electron transport layers.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Multidisciplinary
Myeonggeun Choe, Jin Young Koo, Ina Park, Hiroyoshi Ohtsu, Ji Hoon Shim, Hee Cheul Choi, Sarah S. Park
Summary: In this study, a conductive two-dimensional metal-organic framework (MOF) thin film was successfully synthesized using single-step all-vapor-phase chemical vapor deposition (CVD). The synthesized Cu-3(C6O6)(2) thin film showed high crystallinity with edge-on orientation. Cu-3(C6O6)(2) thin film-based microdevices were fabricated and exhibited an electrical conductivity of 92.95 S/cm. The synthesis of conductive MOF thin films by all-vapor-phase CVD offers a platform for fundamental studies on their physical properties and potential practical applications.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Geosciences, Multidisciplinary
Stefano Pollastri, Eduardo Rossi, Costanza Bonadonna, Jonathan P. Merrison
Summary: Fine ash released into the atmosphere during volcanic eruptions poses a significant threat to ecosystems and society. Accurate estimation of ash concentration through time and space is crucial to mitigate its impact. The study of physical and chemical processes involved in volcanic ash aggregation has shown that particle charge plays a crucial role in the aggregation process.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Energy & Fuels
Juraj Priscak, Ali Valizadeh, Marcus Ohman, Hermann Hofbauer, Matthias Kuba
Summary: Oxygen carrier aided combustion (OCAC) is a technology that enhances combustion efficiency by using an active oxygen carrier. However, interactions between ilmenite and biomass ash lead to the formation of a calcium-rich layer, which decreases the oxygen transport capacity and affects combustion efficiency. This study investigates the time-dependent changes in ilmenite particles and their effects on oxygen transport and reactivity.
Article
Engineering, Civil
Dantong Lin, Xinghao Zhang, Liming Hu, Scott Alan Bradford, Chongyang Shen
Summary: The sticking efficiency is an important parameter for predicting the transport and deposition of colloids in porous media. This study proposes a theoretical method to predict the distribution of the sticking efficiency at pore scale using a pore network model and the macroscale sticking efficiency of the whole porous media by means of upscaling. The results show that the distribution of the sticking efficiency is sensitive to various factors, including colloid characteristics, pore surface features, geochemical environment, and hydrodynamic conditions.
JOURNAL OF HYDROLOGY
(2022)
Article
Engineering, Environmental
Menglong Bai, Linyao Zhang, Yijun Zhao, Shaozeng Sun, Shangbin Du, Penghua Qiu, Wenda Zhang, Dongdong Feng
Summary: In this study, a particle deposition model based on critical viscosity was used to predict the deposition and rebound of particles on the furnace wall. The results showed that controlling the particle size of fly ash particles within 60 μm can effectively reduce the generation of secondary MSWI fly ash and lower post-treatment costs.
Article
Energy & Fuels
Gautham Krishnamoorthy, Monika E. Kuznia, KayLee M. Smith, Wayne S. Seames, Yueming Wang, Jost O. L. Wendt
Summary: Recent experiments and numerical simulations showed a significant increase in ash deposition rates in oxy-coal combustion systems, with aerodynamic effects playing a dominant role and simplistic modeling approaches leading to inaccurate predictions. The study highlights the importance of considering aerodynamics and particle size distributions in predicting deposit characteristics.
Article
Thermodynamics
Alessio Suman, Alessandro Vulpio, Annalisa Fortini, Elettra Fabbri, Nicola Casari, Mattia Merlin, Michele Pinelli
Summary: The study investigates the deposition of micro-sized solid particles and their development over time on surfaces. Different roughness levels and impact velocities were considered to analyze the influence on particle sticking, showing a strong dependence on both flow/particle velocity and substrate roughness.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Biochemical Research Methods
Aranyak Chakravarty, Mahesh Panchagnula, Alladi Mohan, Neelesh A. Patankar
Summary: Pulmonary drug delivery systems rely on inhalation of drug-laden aerosols produced from aerosol generators such as inhalers, nebulizers etc. However, the transport and retention of drugs in the lungs play a crucial role in determining the efficacy of drug delivery. This study develops a mathematical model to analyze drug deposition and retention in the lungs and identifies conditions conducive for delivering drugs to the deep lungs. The analysis confirms that aerosols in the size range of 1-5 μm have the highest drug delivery efficacy to the deep lung, and increasing the breathing time period can increase the amount of drugs deposited in the deep lung.
PLOS COMPUTATIONAL BIOLOGY
(2022)
Article
Mechanics
Yafeng Yang, Yiping Wang, Linli Tian, Chuqi Su, Zhixin Chen, Yuanyi Huang
Summary: The study used computational fluid dynamics to predict the dispersion path and deposition distribution of droplets in an air-conditioned bus, and evaluated the effectiveness of a purifier in removing droplets and reducing the risk of passenger infection.
Article
Thermodynamics
Yingqi Zhao, Qian Huang, Qiang Yao, Shuiqing Li
Summary: The sticking/rebound behavior of solid incident particles is crucial in determining the ash deposition rate under fouling conditions in stationary coal combustion systems. Experimental investigation in a 25 kW coal combustor reveals the dominant role of bulk deposit in capturing large incident particles, and an empirical formula for ash sticking probability is proposed. The effectiveness of the DEM tool in fully validating a sticking/rebound model for CFD use is also demonstrated.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Environmental Sciences
Andres E. Bedoya-Velasquez, Manuela Hoyos-Restrepo, Africa Barreto, Rosa D. Garcia, Pedro Miguel Romero-Campos, Omaira Garcia, Ramon Ramos, Reijo Roininen, Carlos Toledano, Michael Sicard, Romain Ceolato
Summary: This study presents a synergistic approach to studying the aerosol optical and microphysical properties during the 2021 eruption of the Cumbre Vieja volcano in La Palma, Spain. The study aims to characterize the different phases of the volcanic eruption by analyzing the spatio-temporal evolution of the event and quantifying the mass concentration in four atmospheric layers. The impact of the volcanic plume reaching the South of France is also analyzed.
Article
Chemistry, Physical
Christina M. Chang, Luke M. Davis, Eliza K. Spear, Roy G. Gordon
Summary: Copper halides are high-mobility p-type transparent conductors, suitable for thin film optoelectronic devices. Researchers have developed a new CVD method to prepare CuBr thin films, opening up the possibility of a general route for CVD of other metal halides.
CHEMISTRY OF MATERIALS
(2021)
Article
Thermodynamics
Yong Tang, Qiang Yao, Wei Cui, Jiankun Zhuo, Shuiqing Li
COMBUSTION SCIENCE AND TECHNOLOGY
(2020)
Article
Mathematics, Applied
Qian Huang, Shuiqing Li, Wen-An Yong
SIAM JOURNAL ON APPLIED MATHEMATICS
(2020)
Article
Energy & Fuels
Peng Ma, Qian Huang, Qi Gao, Shuiqing Li
Article
Energy & Fuels
Minhang Song, Qian Huang, Fang Niu, Shuiqing Li
Article
Energy & Fuels
Qian Huang, Peng Ma, Linchao Cai, Shuiqing Li
Article
Thermodynamics
Yingqi Zhao, Qian Huang, Qiang Yao, Shuiqing Li
Summary: The sticking/rebound behavior of solid incident particles is crucial in determining the ash deposition rate under fouling conditions in stationary coal combustion systems. Experimental investigation in a 25 kW coal combustor reveals the dominant role of bulk deposit in capturing large incident particles, and an empirical formula for ash sticking probability is proposed. The effectiveness of the DEM tool in fully validating a sticking/rebound model for CFD use is also demonstrated.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Thermodynamics
Shangpeng Li, Qiang Yao, Chung K. Law
Summary: The study focused on the stabilization of the flame base in the bottom Ekman boundary layer of fire whirl under strong circulation, relevant for fire safety and the understanding of blue whirl generation mechanism. The theoretical solutions of liftoff position and critical blowout limit agreed well with the numerical results, indicating two solutions for r(f) under relatively large Damkohler number, with one stable and the other unstable. Explicit solution of the blowout limit showed a proportional relationship with the stoichiometric planar flame speed, with the transversal radial velocity gradient also investigated for its effect on flame stabilization.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Energy & Fuels
Yang Xu, Qian Huang, Shuiqing Li
Summary: The study investigates the physical and chemical effects of CO2 on the ignition behaviors of dispersed coal particles, showing that CO2 significantly delays heterogeneous ignition due to its lower thermal conductivity. The transition from heterogeneous to homogeneous ignition mode under CO2 enrichment is observed, with slower species diffusion rates playing a key role.
Article
Energy & Fuels
Yuanping Yang, Qian Huang, Jinguo Sun, Peng Ma, Shuiqing Li
Summary: This study investigated the impact of various fuel-oxidizer mixing strategies on the NOx performance of ammonia, proposing a new ammonia co-combustion technology and demonstrating the role of NH2 radicals in reducing NOx emissions.
Article
Engineering, Chemical
Lu Duan, Qian Huang, Renshan Ji, Shuiqing Li
Summary: In this paper, a comprehensive predictive model is developed for the synergetic removal of fine particulate matter (PM) and SO3 in the ultralow cold-side electrostatic precipitator (ESP). The model is validated against measurements from two coal-fired units, showing effective removal of PM and SO3 by running the low temperature economizer. The most important factor in the ultralow cold-side ESP is the flow residence time in the ESP, followed by the effects of intensified coagulation and elevated ash permittivity.
JOURNAL OF AEROSOL SCIENCE
(2022)
Letter
Environmental Sciences
Zhenliang Liao, Qiang Yao
NATURE CLIMATE CHANGE
(2022)
Article
Thermodynamics
Yuanping Yang, Qian Huang, Peng Ma, Shuiqing Li
Summary: This study develops a novel approach to accurately measure the sticking probability of low-rank coals and predict their slagging propensity. It is found that alkali metals play a leading role in slagging, while iron has a smaller impact. The results provide a reliable method and criterion for evaluating slagging propensity in solid fuel combustion.
COMBUSTION AND FLAME
(2022)
Article
Energy & Fuels
Peng Ma, Qian Huang, Yuanping Yang, Renshan Ji, Shuiqing Li
Summary: Flexible oxy-coal combustion with carbon capture, utilization, and storage (CCUS) is crucial for achieving carbon neutrality in renewable energy. This study investigates coal stream ignition and soot evolution in different O-2/N-2 and O-2/CO2 atmospheres. Results show that the O-2/CO2 case delays ignition and reduces soot volume fraction compared to the conventional O-2/N-2 atmosphere. The effect of oxygen fraction on soot volume fraction differs between the two atmospheres. Additionally, the coal rank and local temperature affect soot formation ability.
Article
Mathematics, Applied
Qian Huang, Julian Koellermeier, Wen-An Yong
Summary: This paper analyzes the stability of equilibrium manifolds of hyperbolic shallow water moment equations and investigates the relaxation process through numerical simulations.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(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.