Article
Thermodynamics
Hirakh Jyoti Das, Rituraj Saikia, Pinakeswar Mahanta
Summary: A thermo-economic assessment was conducted on three atmospheric bubbling fluidized bed paddy dryers to investigate the effects of inlet air temperature, superficial air velocity, and amount of paddy on exergy efficiency at the equilibrium moisture content (EMC). The study found that dryers with a larger cone angle and shorter payback period had higher annual profits.
Article
Engineering, Chemical
S. Madlmeir, T. Forgber, M. Trogrlic, D. Jajcevic, A. Kape, L. Contreras, A. Carmody, P. Liu, C. Davies, A. Sarkar, J. G. Khinast
Summary: This study investigates the drying and losses of spray droplets during the coating process of medicines. By using simulation and experiments, the researchers propose solutions to reduce coating losses and improve coating yield, leading to significant time savings.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Engineering, Chemical
Ryan Kawakita, Scott Strobel, Bradley Soares, Herbert B. Scher, Todd Becker, Doug Dale, Tina Jeoh
Summary: The one-step encapsulation of subtilisin in a cross-linked alginate matrix shell (CLAM shell) particle maximizes process productivity and improves coating quality. The incorporation of CLAM shell formulation achieved higher spray rates, maintained coating efficiencies above 90%, and reduced attrition and surface damage significantly.
Article
Biochemistry & Molecular Biology
Gary Reineccius, Shardul Patil, Vaidhyanathan Anantharamkrishnan
Summary: This research compares granulation to spray drying/agglomeration for producing flavoring particles. The study finds that granulation produces better properties, such as improved oxidation resistance, higher density, without the need for a two-step process.
Article
Energy & Fuels
Mustafa Metin Cam, Hakan Serhad Soyhan, Mansour Al Qubeissi, Cenk Celik
Summary: The design of energy efficient engineering systems is crucial for sustainable operation. This study focuses on optimizing the bell-type primary air nozzle used in CFB boilers through CFD simulations. By changing the nozzle geometry, pressure drop can be decreased and flow uniformity can be improved, resulting in energy savings and improved boiler operation.
Article
Engineering, Chemical
Heng Li, Daoyin Liu, Jiliang Ma, Xiaoping Chen
Summary: Cycle Time Distribution (CTD) is critical for determining the uniformity of particle coating in spray fluidized beds. This study simulated a spray fluidized bed using a comprehensive Computational Fluid Dynamics-Discrete Element Model (CFD-DEM) and investigated the effects of bed structure and operating conditions on CTD and coating uniformity.
Article
Engineering, Environmental
Wei Zhang, Haiming Wang, Changfu You
Summary: A coupled methodology was developed to model the fluidized bed coating process considering particle abrasion. Experimental data was used to verify the models of evaporation, coating, and abrasion. The research provides an efficient approach for modeling fluidized bed coating processes and offers guidelines for practical application of in-situ desulfurizer preparation.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Aiming Deng, Tianqi Tang, Shanshan Sun, Yurong He
Summary: Wet granulation processes are widely used in various industries, and the impact of injection gas velocity, droplet diameter, and injection liquid viscosity on particle growth ratio and coating thickness distribution was investigated in this study. By decreasing droplet diameter and increasing gas velocity, the particle growth area was significantly expanded, leading to increased collision frequency and decreased liquid content, ultimately improving particle quality and uniformity.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Andrey A. Lipin, Alexandr G. Lipin
Summary: This study proposes a new model for the batch fluidized-bed coating process and evaluates coating uniformity based on the degree of coverage. The numerical solution algorithm predicts particle distribution and analyzes the influence of main process parameters on coating uniformity.
Article
Engineering, Chemical
Ping Li, Ruiyang Xu, Nana Wang, Jianmin Chang, Hui Si
Summary: The pneumatic feeding of biomass particles into the dense-phase region of a fluidized bed is crucial for the design and operation of pyrolysis equipment. Single factor experiments revealed that feeding rate decreases with particle size and gas velocity, showing different trends with static bed height and volume flow ratio. The pneumatic feeding mechanisms of injection gas and fluidizing gas are different but complementary, with a reasonable volume flow ratio improving feeding rate and stability.
Article
Physics, Multidisciplinary
K. Arunkumar, D. Thirumalaikumarasamy, P. Thirumal
Summary: Thermal spray cermet coatings can enhance the wear resistance and corrosion resistance of turbine blades, making them suitable for high temperature and corrosive environments. The angle of impingement was found to have the most significant impact on the erosion rate of the coatings.
Article
Environmental Sciences
Kriangsak Riewklang, Chongchin Polprasert, Kamonwat Nakason, Supawadee Polprasert, Suphaphat Kwonpongsagoon, Suwisa Mahasandana, Bunyarit Panyapinyopol
Summary: This study aimed to evaluate the possibility of precipitating P as struvite from real anaerobic digestion (AD) effluent of tapioca starch processing. The results showed that at a pH of 9 and without Mg:P molar adjustment, P recovery was at 85%. Controlled mixing and upflow velocity inside a fluidized bed reactor (FBR) increased P recovery to 90% with P content in precipitates higher than commercial fertilizer. Woodchip ash additions and analysis revealed that mixing, solution pH, and ash intensity affected P recovery. The study highlights the potential for P recovery and nutrient utilization from tapioca starch AD effluent to address environmental issues.
ENVIRONMENTAL RESEARCH
(2023)
Article
Agronomy
Ingrid Zwertvaegher, Aude Lamare, Jean-Paul Douzals, Paolo Balsari, Paolo Marucco, Marco Grella, Amedeo Caffini, Nikos Mylonas, Donald Dekeyser, Dieter Foque, David Nuyttens
Summary: This study selects the optimal nozzle type, spacing, and height for bed spray applications, aiming to reduce pesticide losses through laboratory testing and measurements.
PEST MANAGEMENT SCIENCE
(2022)
Article
Engineering, Chemical
Ping Li, Nana Wang, Ruiyang Xu, Jianmin Chang, Hui Si
Summary: This study explores the pneumatic feeding characteristics of a fluidized bed to enhance understanding of biomass pyrolysis. By analyzing the pneumatic feeding mechanism from aspects including feed gas, feed biomass particles, and pneumatic feeding, it is revealed how the feed gas promotes particle diffusion, mixing, and deeper penetration into the bed. A dynamic model of pneumatic feeding into the fluidized bed reactor is established to integrate particle interaction, diffusion, mixing, and fluidization.
Article
Pharmacology & Pharmacy
Michael W. Stocker, Matthew J. Harding, Valerio Todaro, Anne Marie Healy, Steven Ferguson
Summary: Integrated API and drug product processing allows molecules with high clinical efficacy but poor physicochemical characteristics to be commercialized by co-processing with excipients. The goal of this study was to purify a model API and impurity system and directly process it into a solid-state formulation without isolating a solid API phase. Confined agitated bed crystallization was used to purify the impure API and the spray coating process was developed using a Design of Experiments approach to control drug loading efficiency and crystallinity.
Article
Engineering, Civil
Hadi Torkamani, Shahram Raygan, Carlos Garcia Mateo, Yahya Palizdar, Jafar Rassizadehghani, Javier Vivas, David San-Martin
Summary: By decreasing the IHT temperature, the volume fraction of martensite in DP steel decreases while the block size becomes smaller, leading to an increase in hardness but limited impact on material strength and hardness.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2021)
Article
Energy & Fuels
Raziyeh Ahmadi, Mehdi Ardjmand, Alimorad Rashidi, Mehdi Rafizadeh
Summary: In this study, waste jute was successfully synthesized and fabricated as a novel nanoadsorbent, which showed a unique micro-mesoporous structure and excellent adsorption capabilities. Through physicochemical characterization and experimental results, the potential application of this nanoadsorbent for gas adsorption on a large scale was confirmed.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Engineering, Chemical
Faisal Momoniat, Nejat Rahmanian
Summary: The study compared three samples of sulfur, one in prilled form and the other two in granular form produced by different granulation processes. Tests included particle size distribution, strength measurement, structure analysis, and thermal calorimetry. Differences were found in physical and mechanical properties between sulfur prills and granules.
PARTICULATE SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Chemical
Mehdi Rahmani, Babak Mokhtarani, Morteza Mafi, Nejat Rahmanian
Summary: This study investigates the adsorption of acid gas (hydrogen sulfide and carbon dioxide) by superhigh silica ZSM-5 and measures the adsorption isotherms of different natural gas components (methane and nitrogen) on this sorbent. The results show that ZSM-5 has a high adsorption capacity for hydrogen sulfide and a low capacity for nitrogen. The selectivity of hydrogen sulfide increases with temperature, while other components show no significant change in selectivity.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Engineering, Chemical
Seyed Hadi Banijamali, Shahram Raygan, Ahmad Ali Amadeh
Summary: This study characterized a silver-containing zinc sulfide concentrate and investigated the solvent extraction behavior and recovery of silver. The leaching efficiency reached 90.5% under specific conditions. The three organic solvents tested showed similar extraction and recovery of silver ions.
MINERALS ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Hiba R. Mohammed, Khaleel I. Hamad, Saba A. Gheni, Dhia Y. Aqar, Marwan A. Mahomood, Omar A. Habeeb, Safaa M. R. Ahmed, Nejat Rahmanian
Summary: The deactivation of oxidative desulfurization catalysts is a major concern in industrial catalytic processes. In this study, activated carbon was modified to withstand the loss of activity over time. The results showed that the coating layer can retard the degradation of the active metal and suppress phase transitions, without affecting the reaction kinetics of the catalyst. The activation energy of the deactivation reaction for the coated catalyst was found to be higher.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Engineering, Chemical
Hossein Elahidoost, Saeed Sheibani, Shahram Raygan, Leila Hosseini, Nader Esmaeili
Summary: The effect and mechanism of magnetite concentrate morphology on the quality of indurated pellets were investigated. It was found that the morphology of HPGR concentrate with a broad particle size distribution and high aspect ratio improved the cold compressive strength of indurated pellets. The microstructural analysis revealed that the irregular shape and broad particle size distribution of HPGR particles led to enhanced sintering, increased interlocking force, longer crack propagation path, formation of uniform liquid phase distribution, and decreased pellet porosity.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Engineering, Chemical
Tony B. Arthur, Nana K. G. Sekyi, Nejat Rahmanian, Jaan Pu
Summary: The effect of screw configuration on granule size distribution (GSD) was evaluated using gPROMS FormulatedProduct (gFP) software for optimization, estimation, and analysis of complex processes. Twin-screw granulation modeling was used to study the impact of screw configuration and liquid-to-solid (L/S) ratio on GSD. Lactose and Avicel were used as granulating materials. Twelve different configurations were investigated at three feed rates and various L/S ratios. Results showed that kneading elements improved the recovery of 100-1000 μm granules while reducing the production of oversized granules. Higher feed rates favored the production of fines and agglomerates, while a lower feed rate produced 100-1000 μm granules.
CHEMICAL ENGINEERING & TECHNOLOGY
(2023)
Article
Environmental Sciences
Farzaneh Taghizadeh, Babak Mokhtarani, Nejat Rahmanian
Summary: This study evaluates the current status of air pollution in Iran, including emission sources, control policies, and health and climate consequences. It finds that many Iranian cities exceed permissible air pollution levels, particularly for particulate matter, sulfur dioxide, black carbon, and ozone. Implementation and enforcement of regulations are not fully effective, due to inefficiencies in regulation systems, lack of monitoring technology (especially in industrial cities), and inadequate feedback on regulation efficiency. The study suggests conducting systematic reviews using scientometric methods, integrating approaches for both climate change and air pollution, and collaborating with international counterparts.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2023)
Article
Thermodynamics
Saeed Avaji, Jafar Javanmardi, Amir H. Mohammadi, Nejat Rahmanian, Vladislav De Gald
Summary: A genetic algorithm was used to optimize a new set of Kihara Potential Function Parameters based on a new definition of the objective function considering hydrate structure. The results showed good agreement with experimental data in predicting hydrate dissociation conditions and structure.
FLUID PHASE EQUILIBRIA
(2023)
Article
Energy & Fuels
Mehdi Rahmani, Babak Mokhtarani, Nejat Rahmanian
Summary: In this study, the adsorption properties of ultra-stable Y (USY) zeolite were measured, and it was found that it has a high adsorption capacity for hydrogen sulfide and can be completely regenerated. The isosteric adsorption heat of hydrogen sulfide on the adsorbent is 18.1 kJ/mol, indicating physical adsorption, and non-regenerability is the main challenge when using surface adsorbents.
Article
Engineering, Chemical
Nana Kobina Gyan Sekyi, Adrian Kelly, Nejat Rahmanian
Summary: An experimental study using a design of experiments approach was conducted to investigate twin screw granulation (TSG). The effects of processing parameters such as speed, temperature, and binder content on granule strength and structure were analyzed. Seeded granule structures were found in all but one type of granulator, and longer residence times resulted in maximum seeded structures in a batch Cyclomix granulator. TSG showed higher granule crushing strengths compared to other continuous equipment, and the optimum condition for forming stronger granules with lower variation was around 65.4 degrees C. Overall, an equipment-specific design of experiments approach proved useful in understanding the relationship between process parameters, structure, and properties.
Article
Materials Science, Multidisciplinary
Hossein Elahidoost, Saeed Sheibani, Shahram Raygan, Leila Hosseini, Ali Dehghani Ahmadabadi, Nader Esmaeili
Summary: The study investigates the influence of concentrate morphology on the oxidation and sintering rates of magnetite pellets during induration, as well as its impact on the quality of the indurated pellets. The results show that the morphology of the concentrate affects the thermal behavior during induration, with high-pressure grinding rolls (HPGR) pellets oxidizing slower and having higher cold compressive strength (CCS) than ball milling (BM) pellets. The microstructural analysis reveals that HPGR powder sinters faster due to its angular shape and broad particle size distribution.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Thermodynamics
Fatemeh Goodarzvand-Chegini, Leila Samiee, Nejat Rahmanian
Summary: In oil, gas and petrochemical production complexes, steam pressure boosting technology is used to recover low-pressure steam and increase energy efficiency. Heat recovery from flash steam is considered an economical and attractive solution. A case study in a gas plant in Iran showed that using steam compressors and ejectors for flash steam recycling resulted in significant energy savings and reduced carbon dioxide emissions.
ENERGY CONVERSION AND MANAGEMENT-X
(2023)
Article
Chemistry, Applied
Sajjad Porgar, Nejat Rahmanian
Summary: The thermal behavior of aluminium oxide-water nanofluid in a double pipe carbon steel heat exchanger was investigated in this study. The results showed that the addition of nanoparticles significantly improved the thermal properties of the base fluid, and under counter-current conditions, the overall heat transfer coefficient and heat transfer efficiency of the nanofluid were greatly enhanced.
BIOINTERFACE RESEARCH IN APPLIED CHEMISTRY
(2022)
Article
Materials Science, Coatings & Films
Yanchun Xie, Xiaodong Wang, Shenshen Cui, Jiali Hu, Yongcun Wei, Yi Lian, Anwu Xuan, Bin Yu, Erlin Zhang
Summary: In this study, Ti-xFe (x = 3,5,9 wt%) alloys were surface modified by micro-arc oxidation (MAO) to improve their antimicrobial properties and biocompatibility. The results showed that increasing the oxidation voltage greatly enhanced the roughness and hydrophilicity of Ti-xFe-MAO alloys. The Ti-xFe alloys micro-arc oxidized at 250 V and 300 V exhibited improved corrosion resistance and excellent antimicrobial and cytocompatibility properties, making them suitable for orthopedic implant materials.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Yuting Hao, Zuoyan Ye, Lili Wang, Minheng Ye, Hui Dong, Chao Wang, Yunchen Du
Summary: This study focuses on the modification of PEO coatings on Ta-12W alloy using NH4F additive. The results show that ultra-low porosity coatings can be prepared by optimizing the NH4F content. The formation process of specific structures on the coating surface is discussed, and the effects of NH4F concentration and treatment duration on coating characteristics are investigated.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Yuanzhuo Liu, Linjiang Chai, Tao Yang, Chaodan Hu, Chuanmei Wang, Guoqiang Xi
Summary: By employing a pulsed laser, laser cladding was performed on IN718 alloy pre-coated with CrCoNi-TiC/SiC powders and three defect-free coatings were successfully prepared. The addition of TiC and SiC powders generated fine carbides dispersed in the coatings and led to changes in grain and substructure morphologies, resulting in increased hardness and wear resistance.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
M. Ghaemi, A. Lopez-Cazalilla, K. Sarakinos, G. J. Rosaz, C. P. A. Carlos, S. Leith, S. Calatroni, M. Himmerlich, F. Djurabekova
Summary: The use of high-power impulse magnetron sputtering can result in dense and uniform niobium films on all surfaces of superconducting rf cavities, as simulated and investigated in this study.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Jiaheng Du, Xinli Fan, Dongqin Xiao, Wuxiang Wang, Yiran Yin, Zhong Li, Kui He, Yanfei Tan, Jiyuan Yan, Gangli Liu, Ke Duan
Summary: This study investigated the electrophoretic deposition (EPD) of magnesium oxide (MgO) coatings on micro-arc oxidized titanium (MAO-Ti) and evaluated their in vitro antibacterial properties and biocompatibility. The results showed that MgO coatings significantly reduced bacterial numbers and biofilm formation, while also demonstrating good cytocompatibility and induction of osteoblast mineralization.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Samiksha Moharana, Yuichi Otsuka, R. Gnanamoorthy
Summary: The addition of titania to HAp coatings improves their wear resistance and reduces damage to titanium implants caused by debris generation. This study evaluates the fretting wear resistance of titania-added HAp suspension plasma spray coating and finds that it exhibits reduced friction coefficient and increased wear resistance.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Li-Ping Wu
Summary: The functional hazenite coating deposited on AZ31 Mg alloy showed improved roughness and hydrophilicity, enhanced biocompatibility, reduced degradation rate, and decreased susceptibility to stress corrosion cracking.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Ning Tian, Delei Xu, Jinfei Wei, Bucheng Li, Junping Zhang
Summary: This study reports the preparation of a superhydrophobic and anti-bacterial fabric for face masks. The fabric exhibits high superhydrophobicity and excellent moisture resistance, enabling functionality effectiveness in cold weather conditions. The fabric also demonstrates remarkable anti-bacterial activity against E. coli, attributed to the synergistic effect of superhydrophobicity and embedded ZnO nanoparticles. This superhydrophobic anti-bacterial fabric holds great potential for various practical applications in personal protective equipment, healthcare, and disease prevention.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Katharina Beck, Anke S. Ulrich, Andreas K. Czerny, Emma M. H. White, Martin Heilmaier, Mathias C. Galetz
Summary: Refractory metal based alloys have great potential as structural materials for high-temperature applications due to their high melting points. However, they are prone to catastrophic oxidation at around 700 degrees C. This study investigated the effect of aluminium diffusion coatings on the oxidation resistance of pure molybdenum, niobium, tantalum, and tungsten. The results showed that the aluminization improved the oxidation behavior and decreased the oxide growth rate for molybdenum and tantalum.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Wenwen Shuai, Haijun Dou, Zhichen Guan, Wei Qian, Zhibao Li, Yinqun Hua, Jie Cai
Summary: This study synthesized (Y1-xLax)3Al5O12 (x = 0, 0.1, 0.2, 0.3) materials by doping lanthanum ions, and found that the doped materials exhibited improved mechanical properties and thermal expansion coefficient, as well as enhanced resistance to CMAS corrosion. These materials have potential applications.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Xianglei Liu, Jiahui Ding, Wanbo Hou, Xinhao Shi, Tao Feng, Xiangyuan Meng, Shifeng Wen, Mingde Tong, Zhufeng Yue
Summary: A composite coating was developed to improve the adhesion, wear resistance, and corrosion resistance, which exhibited significant enhancements in these properties.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Hongxuan Xing, Jidong Li, Xianwei Hu, Liang Tian, Renyun Zhang, Yiyong Wang
Summary: By depositing a Cu/Co-Mo corrosion-resistant plating layer on the surface of 6061 Al alloy, the bonding strength between the alloy and the plating layer can be improved and the corrosion resistance can be enhanced. The composite coating forms an obvious three-layer structure with Co-Mo coating exhibiting amorphous characteristics and Co3Mo phase composition. The composite coating improves the corrosion resistance and hardness of the substrate, effectively protecting the 6061 Al alloy.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Fan Yang, Debin Wang, Tianrun Li, Baijun Yang, Suode Zhang, Jianqiang Wang
Summary: The impact-corrosion behavior of monolayer and hierarchical Fe-based amorphous coatings fabricated by HVAF was investigated in 3.5 wt% NaCl solution. The monolayer coating exhibits corrosion failure with increased impact energy, while the hierarchical coating shows improved resistance. However, at high impact energies, both coatings experience corrosion degradation.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Shoaib Ahmad, Muddasir Nawaz, Solaiman Mohammad, R. A. Shakoor, Ramazan Kahraman, Talal Mohammed Al Tahtamouni
Summary: This research presents a novel self-healing anti-corrosion composite coating that demonstrates higher inhibition efficiency and self-healing effect, providing protection for metallic structures against corrosive environments.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Hui-Wen Peng, Chun-Hway Hsueh
Summary: A series of (CoCrNi)100-x-ySixNdy medium entropy alloy films with manipulated metalloid element, Si, and rare earth element, Nd, were synthesized using magnetron three-target co-sputtering. The films showed different structures and mechanical properties with varying Si and Nd contents. The optimized mechanical properties were observed in the film with Si0.61Nd5.14, attributed to precipitation strengthening and grain refinement.
SURFACE & COATINGS TECHNOLOGY
(2024)
