Article
Engineering, Chemical
Mahsa Taghavi, Brian J. Motil, Henry Nahra, Vemuri Balakotaiah
Summary: Modifications were made to the PBRE to eliminate pressure oscillations, and the effects of bed history, pre-flow conditions, flow rates, and particle diameter on gas hold-up and pressure gradients were investigated.
Article
Engineering, Multidisciplinary
Ahmed M. Alatyar, Abdallah S. Berrouk, Mohamed S. Alshehhi, Muhammed Saeed, Haitem Hassan-Beck, Krishnaswamy Nandakumar
Summary: The current study aims to enhance the hydraulic performance of Rotating Packed Beds (RPB) by modifying the geometrical construction of the inner cavity, outlet pipe, and packing. Four novel geometries of the RPB were proposed and analyzed using a validated CFD model, and it was found that optimizing the flow pattern at the exit of the packing by modifying the inner cavity's shape can reduce the total pressure drops by up to 22%. The addition of a nozzle at the entry of the outlet pipe further decreases the pressure drop by 13%.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Brian J. Motil, Enrique Rame, Paul Salgi, Mahsa Taghavi, Vemuri Balakotaiah
Summary: Experimental results on gas-liquid flow through packed beds in the International Space Station show that pressure drop depends on packing wettability, with capillary forces dominating in the V-C regime. In microgravity, hysteresis effects are diminished and pressure drop is nearly independent of packing wettability. Comparison with earlier aircraft data shows a transition from bubble to pulse flow patterns.
Article
Thermodynamics
Zhengzheng Zhang, Liangxing Li, Weimin Ma, Yidan Yuan, Xiaoming Yang, Rubing Ma
Summary: In this study, experiments and numerical simulations were conducted to investigate the two-dimensional flow characteristics in a radially stratified porous bed. The experimental results showed that the pressure drops in the two layers of the radially stratified bed were almost equal, and lateral flowing from the low permeability layer to the high permeability layer caused the pressure drop variations. The numerical simulation results were in good agreement with the experimental results.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Energy & Fuels
Pornsawan Tongbai, Kitti Keawchart, Bundit Krittacom
Summary: The study indicates that the combustion behavior and evaporation mechanism of the spherical packed-bed porous burner are strongly influenced by the equivalence ratio and firing-rate input, allowing for steady combustion state within certain Phi and FR ranges, with low CO and NOX emission levels.
Article
Environmental Sciences
Bhaskar Anand, Ki-Hyun Kim, Ravi Kumar Sonwani, Jan E. Szulejko, Philippe M. Heynderickx
Summary: This study examines the effect of physical features of nanomaterial adsorbents on their adsorption performance. It is found that coating MOF-199 on glass beads improves its adsorption efficiency, with the best performance observed at 1% loading. This study offers new strategies to expand the utility of finely powdered MOFs in environmental applications.
ENVIRONMENTAL RESEARCH
(2022)
Article
Engineering, Environmental
Lucas Chatre, Joseph Socci, Samuel J. Adams, Petr Denissenko, Nikolay Cherkasov
Summary: The paper presents a simplified approach to improve the efficiency of packed-bed reactors with structure-directed random packing, which alleviates mass transfer issues and reduces pressure drop, resulting in energy savings.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Energy & Fuels
Mohammad M. S. Al-Azawii, Sabah F. H. Alhamdi, Sasha Braun, Jean-Francois Hoffmann, Nicolas Calvet, Ryan Anderson
Summary: This paper presents experimental results comparing a new 100% recycled ceramic material, ReThink Seramic - Flora, with conventional alpha-alumina materials in thermal energy storage. The study shows that alumina beads have higher performance in terms of thermal exergy efficiency than ReThink Seramic - Flora.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Environmental Sciences
Justyna Wojtasik-Malinowska, Maciej Jaskulski, Marcin Jaskulski
Summary: Rotating packed bed (RPB) is a promising technology for enhancing mass transfer in absorption processes. Understanding fluid dynamics is crucial for filling knowledge gaps, and raising awareness and establishing rules for process design and control are also important. This study proposes using CFD simulation to study gas phase flow in porous packing. The simulation results show good consistency with experimental data, indicating that CFD modelling is a useful tool for understanding gas phase behavior in RPB and improving its design and performance.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Engineering, Chemical
Kavin Sundarnath J. Ayyanathan, Sarada Kuravi
Summary: The experimental study investigated the effect of an alternating magnetic field on pressure drop inside fixed beds with different packing types. It was found that the magnetic field can reduce pressure drop in loosely packed beds, while altering the magnetic field orientation can either increase or decrease pressure drop values in tightly packed beds.
PARTICULATE SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Environmental
Yudong Li, Xiaowen Chen, David A. Sievers
Summary: The deacetylation process in lignocellulosic biomass pretreatment can be made more efficient and economically favorable with a flow-through diffuser type reactor and a washing step before deacetylation. Understanding the fundamentals of flow through a compressible packed bed is crucial for scaling up the process. Modifying the classical Kozeny Carman equation and developing a compressible packed bed model can accurately predict pressure-drop and stabilize the bed from extensive compression.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Chao Zhang, Weizhou Jiao, Youzhi Liu, Guisheng Qi, Zhiguo Yuan, Qiaoling Zhang
Summary: This study utilized computational fluid dynamics (CFD) to investigate dry pressure drop in the cross-flow rotating packed bed (RPB), finding that the RNG k-epsilon model best described turbulence behaviors. The effects of gas flow rate and rotating speed on dry pressure drop in different parts of the RPB were also analyzed, providing important insights for design and scale-up.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Environmental
Qiang Li, Ran Tang, Shuai Wang, Zongshu Zou
Summary: In this study, a coupled model (LLID) was developed to investigate the pressure drop and interface characteristics of HAL beds. The model was carefully calibrated and verified, and a new correlation for pressure drops in HAL beds was proposed.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Chemical
Pranay P. Nagrani, Amy M. Marconnet, Ivan C. Christov
Summary: Gas-liquid flows in packed bed reactors are challenging to predict, especially under microgravity conditions where bubble and pulse flows are predominant. Through simulation and quantitative analysis, different pore-scale mechanisms and dynamic trade-offs between inertia, capillary, and buoyancy forces were observed.
Article
Nuclear Science & Technology
Seokgyu Jeong, Keun Sang Choi, Hwan Yeol Kim, Sang Mo An, Jaehoon Jung
Summary: This study analyzed the basic characteristics of non-explosive TROI particles and conducted single-and two-phase pressure drop experiments in the particle bed. The Ergun model with an effective diameter of 1 mm predicted single-phase pressure drop results accurately, while the Schmidt and Schulenberg & Muller models with effective diameters of 3 mm and 2 mm respectively predicted two-phase pressure drop results well. The effects of particle bed characteristics on pressure drop were also discussed, and a modified pressure drop model reflecting the measured porosity was proposed.
NUCLEAR ENGINEERING AND DESIGN
(2022)
Article
Engineering, Environmental
Esra Erdim, Appala Raju Badireddy, Mark R. Wiesner
JOURNAL OF HAZARDOUS MATERIALS
(2015)
Article
Engineering, Chemical
Selda Yigit Hunce, Elif Soyer, Omer Akgiray
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2016)
Article
Engineering, Environmental
Nafiz E. Korkut, Cevat Yaman, Yusuf Kucukaga, Megan K. Jaunich, Ibrahim Demir
WASTE MANAGEMENT & RESEARCH
(2018)
Article
Engineering, Environmental
Z. Y. Ozkan, M. Cakirgoz, E. S. Kaymak, E. Erdim
WATER SCIENCE AND TECHNOLOGY
(2018)
Article
Engineering, Chemical
Selda Yigit Hunce, Elif Soyer, Omer Akgiray
Article
Engineering, Environmental
Selda Yigit Hunce, Elif Soyer, Omer Akgiray
Article
Environmental Sciences
Esra Erdim, Zeynep Yucesoy Ozkan, Halil Kurt, Bilge Alpaslan Kocamemi
SCIENCE OF THE TOTAL ENVIRONMENT
(2019)
Article
Environmental Sciences
Onur Isik, Amr Mustafa Abdelrahman, Hale Ozgun, Mustafa Evren Ersahin, Ibrahim Demir, Ismail Koyuncu
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2019)
Article
Biotechnology & Applied Microbiology
Onur Isik, Riza Hudayarizka, Amr M. Abdelrahman, Hale Ozgun, Mustafa E. Ersahin, Ibrahim Demir, Ismail Koyuncu
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2020)
Article
Engineering, Chemical
Recep Kaya, Hale Ozgun, Mustafa Evren Ersahin, Merve Durmus Yilmaz, Mohammad Damirchi, Ismail Koyuncu, Nevzat Ozgu Yigit, Mehmet Kitis, Ibrahim Demir, Osman Atilla Arikan
DESALINATION AND WATER TREATMENT
(2017)
Article
Engineering, Chemical
Elif Soyer, Selda Yigit Hunce, Omer Akgiray
DESALINATION AND WATER TREATMENT
(2017)
Article
Engineering, Chemical
Ibrahim Demir, Mehmet E. Pasaoglu, Serkan Guclu, Turker Turken, Senol Yildiz, Vahit Balahorli, Ismail Koyuncu
DESALINATION AND WATER TREATMENT
(2017)
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.