Article
Engineering, Environmental
Morteza Davarpanah, Zaher Hashisho, David Crompton, E. James Anderson
Summary: Choosing proper formulas for estimating variables is crucial in modeling a fluidized bed using two-phase theory. This study compared different approaches and suggested a broadly-applicable set of formulas for describing the behavior of various countercurrent fluidized bed adsorbers. Proper formula use could significantly enhance the two-phase model performance in accurately replicating a large dataset of fluidized bed adsorption experiments.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Engineering, Chemical
Jiantao Li, Xiuying Yao, Lei Zhang, Chunxi Lu, Zhenghong Luo, Xiaotao Bi
Summary: A baffled fluidized bed heat exchanger was proposed to enhance the bed-to-surface heat transfer coefficient. The design of the baffles intensifies the contact characteristics between heat transfer tubes and fluidized bed medium, improving the heat transfer performance.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Energy & Fuels
Jiaying Wang, Zeneng Sun, Yuanyuan Shao, Jesse Zhu
Summary: Circulating fluidized bed combustors are commonly used gas-solid convertors globally. Different operating regimes have been suggested by researchers, but there is still no universally accepted conclusion. Analysis of reported data supports the operation of the bottom part in the bubbling regime and the upper part as an entrained bed in commercial boilers.
Article
Engineering, Chemical
M. Suarez-Almeida, A. Gomez-Barea, C. Pfeifer, B. Leckner
Summary: A hydrodynamic model of a dual fluidized bed gasifier (DFBG) was developed and theoretically analyzed for performance in terms of solids circulation and distribution in the gasifier. The model was also extended to design a solar DFBG (SDFBG) using heated solid particles, focusing on the operation with high solids inventory and control of solids circulation. These analyses showed the importance of size of the gasifier, connection design between units, and solid circulation rate for efficient operation of the DFBG.
Article
Engineering, Chemical
Allan S. Issangya, Ray A. Cocco, S. B. Reddy Karri, Ted M. Knowlton, Jia Wei Chew
Summary: This study investigates the local flow and flooding behaviors of fluidized bed strippers, with a focus on bed density, pressure fluctuations, and bubble void fraction. It was found that the grating stripper performed better in terms of bed density and flooding prevention compared to disk and donut strippers. Increasing fines composition and adding holes to disk and donut trays can help mitigate flooding.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Engineering, Chemical
Areej Javed, Yongli Ma, Mingyan Liu
Summary: A flow model for the gas-liquid-solid circulating fluidized bed with a mesoscale flow structure has been established in this study. The study validates the bubble hydrodynamics calculated by the energy-minimization multiscale model using empirical correlations. The results show that the drag coefficient has a significant impact on bubble hydrodynamics, and the new EMMS model offers the best agreement with experimental data.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Engineering, Chemical
Jiantao Li, Xiuying Yao, Lu Liu, Xudong Zhong, Chunxi Lu
Summary: An experimental setup was constructed to study the bed-to-wall heat transfer in a gas-solid fluidized bed with external solids circulation. It was found that gas velocity affects bubble properties, and external solids circulation can improve heat transfer efficiency, with packet residence time playing a crucial role in the process.
Article
Energy & Fuels
Kiattikhoon Phuakpunk, Benjapon Chalermsinsuwan, Suttichai Assabumrungrat
Summary: This study used computational fluid dynamics to explore a louver baffles arrangement that could reduce bubble coalescence in a bubbling bed gasifier fueled by biomass. The results showed that 10 mm-gap baffles were effective in reducing bubble size and slowing down bubble coalescence, while also providing better gas-solid contact.
Article
Engineering, Chemical
Dongfang Li, Runxia Cai, Seokgi Ahn, Xiaofeng Lu, Sungmook Jung, Chung-Hwan Jeon, Xing Zhu
Summary: Five field tests were conducted to measure the pressure drops in the transport zone of a 550-MWe CFB boiler in order to investigate its hydrodynamics. The calculated circulating rates Gs were compared with estimations based on elutriation constant and saturation-carrying capacity theories, showing good agreement for the elutriation constant but discrepancies for the saturation-carrying capacity. The effect of riser diameter on Gs was discussed, indicating an independence of the circulating rate beyond a certain dimension.
Article
Engineering, Chemical
Yunpeng Zhao, Chengxiu Wang, Xiaogang Shi, Jinsen Gao, Xingying Lan
Summary: The variation of gas velocity can significantly affect the flow characteristics in turbulent fluidized bed reactors. Neglecting this variation may lead to underestimated nonuniformity in radial flow and overestimated nonuniformity in axial flow. Particle clusters play a crucial role in explaining the different flow behaviors at constant and variable gas velocities.
Article
Engineering, Environmental
Fardin Sattari, Maryam Tahmasebpoor, Jose Manuel Valverde, Carlos Ortiz, Mousa Mohammadpourfard
Summary: The manuscript presents a general model for a fluidized bed carbonator reactor based on bed hydrodynamics, kinetics, and sorbent properties in the Calcium Looping (CaL) process. The study identifies key operational and hydrodynamic factors affecting CO2 capture efficiency, and highlights important model parameters. The model predictions are in agreement with experimental results and may be relevant for optimizing CaL operation conditions in power plants.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Thermodynamics
Hirakh Jyoti Das, Pinakeswar Mahanta, Rituraj Saikia
Summary: Conical fluidized beds have unique dynamic features due to their lower pressure drop compared to conventional fluidized beds. This study investigates the fluid dynamics and interphase heat transfer phenomena in a conical bubbling fluidized bed riser, with varying inlet air velocity. The results show that an air velocity of 2 m/s yields the lowest pressure drop and highest heat transfer, making it the optimal value for the study.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Environmental Sciences
Kandethupara Bhaskaran Divya, Srikrishnaperumal Thanga Ramesh, Addagada Lavanya, Rajan Gandhimathi
Summary: In this study, a novel fluidized bed homogeneous crystallization technique was employed to granulate phosphorous as hydroxyapatite, which allows for the formation of high purity crystals without seed addition. Key operational parameters were analyzed to determine their influence on granulation efficiency. The findings provide valuable insights for phosphorous recovery from aqueous solutions.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Engineering, Chemical
Trilokpati Tribedi, Premsagar Pillajetti, Roushni Kumari, Harish Jagat Pant, Pankaj Tiwari, Rajesh Kumar Upadhyay
Summary: In a Geldart's group B CFB riser, the solid motion predominantly lies in the axial direction. The probability distribution function of solid velocity shows wider distribution near the wall compared to the center of the riser. Mean solid velocity depends largely on gas-solid interactions, while fluctuating velocity depends on both gas-solid and solid-solid interactions.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Engineering, Chemical
Jaroslaw Grochowalski, Agata Widuch, Slawomir Sladek, Bartlomiej Melka, Marcin Nowak, Adam Klimanek, Marek Andrzejczyk, Marcin Klajny, Lucyna Czarnowska, Bartlomiej Hernik, Minmin Zhou, Sebastian Pawlak, Wojciech Adamczyk
Summary: This paper presents a methodology to mitigate the risk of heating surfaces exposed to particle erosion in a circulating fluidized bed boiler. A machine learning algorithm is developed to support boiler reliability management. The virtual procedure using digital models provides answers for scenarios that cannot be studied during boiler operation. The predictive model developed in this work provides feedback to the control systems regarding changes in operating conditions and reduces erosion effect.
Review
Engineering, Chemical
Seyedmehdi Sharifian, Rahmat Sotudeh-Gharebagh, Reza Zarghami, Philippe Tanguy, Navid Mostoufi
Summary: This review delves into the origins of uncertainty and error in chemical process design, highlighting the importance of accurate analysis and evaluation of information in modern plants. It emphasizes that in a multidisciplinary modeling approach, each step can potentially introduce uncertainty, leading to unreliable results. Additionally, the review briefly presents some uncertainty analysis and evaluation methods, and proposes future research guidelines based on existing research gaps.
REVIEWS IN CHEMICAL ENGINEERING
(2021)
Article
Mechanics
Ali Ebrahimi-Mamaghani, Rahmat Sotudeh-Gharebagh, Reza Zarghami, Navid Mostoufi
Summary: The thermo-mechanical vibrations of axially functionally graded pipes conveying fluid are investigated in order to enhance the stability of fluid-interaction systems. The study explores the influence of different factors, such as material gradient, power index, boundary conditions, rotary inertia factor, temperature rise, and different boundary conditions, on the dynamic configuration of the system. The results show that detached stable regions emerge and develop by increasing the power index at sufficiently high mass ratios.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2022)
Article
Engineering, Chemical
Saman Kazemi, Reza Zarghami, Navid Mostoufi, Rahmat Sotudeh-Gharebagh
Summary: The study found that electrostatic charges in fluidized beds cause particle aggregation to form agglomerates, which in turn result in a layered structure on the wall surface. Compared to neutral beds, the accumulation of particles near the wall significantly increases in the presence of electrostatic charges.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Engineering, Chemical
Hossein Norouzi-Firouz, Mohammad-Hossein Sarrafzadeh, Reza Zarghami, Iman Moshiri-Tabrizi
Summary: The study combined hydrodynamic and biokinetic models to simulate lab-scale oxidation ditch for activated sludge process, investigating the effects of varying rotational speed and solid volume fraction on liquid phase velocity. The findings indicated that increasing aerator speed and solid volume fraction can impact liquid phase velocity significantly.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Engineering, Chemical
Mohammadmahdi Kamyabi, Khashayar Saleh, Reza Zarghami, Rahmat Sotudeh-Gharebagh
Summary: This study modeled the kinetics of water sorption by a bed of powder to estimate the characteristic time of caking under real and test environmental conditions. The experimental measurements showed that water uptake by the powder was faster in the caking device compared to the humidity chamber. By solving model equations, the mass diffusion coefficient (D) and the total mass transfer coefficient (K) of henna were predicted.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2021)
Review
Engineering, Chemical
Mitra Sadat Lavasani, Nahid Raeisi Ardali, Rahmat Sotudeh-Gharebagh, Reza Zarghami, Janos Abonyi, Navid Mostoufi
Summary: This article provides an overview of big data, its characteristics, and related topics, as well as a systematic review of available big data techniques and analytics. It also discusses recent applications of big data in the chemical industry and emphasizes its practical application in various process engineering areas.
REVIEWS IN CHEMICAL ENGINEERING
(2023)
Review
Engineering, Chemical
Shahab Golshan, Gregory S. Patience, Reza Zarghami, Jamal Chaouki, Bruno Blais
Summary: Around 75% of raw materials in the chemical industry and 50% of consumer products are in the form of powders or granular solids. Researchers use various techniques, including fibre optic probes, to study the hydrodynamics of fluid-solid systems. Fibre optic probes are simple, inexpensive, and sensitive tools that can measure local properties such as particle velocity, solids fraction, and voids in heterogeneous systems. MATLAB codes and experimental data are provided as examples for processing raw signals and obtaining information on gas/solids/bubble holdup, particle and bubble velocity, bubble size, and solids flux.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Engineering, Marine
Ali Ebrahimi-Mamaghani, Navid Mostoufi, Rahmat Sotudeh-Gharebagh, Reza Zarghami
Summary: In this study, the linear and nonlinear vibrations of supported pipes with two-phase flow were modeled using the drift-flux model. The effects of flow parameters, geometry, and physical properties on the system dynamics were examined through validation and parametric analysis. The results showed that the pipe diameters, liquid phase density, and void fraction/mixture velocity have significant influence on the vibrational frequencies of the system.
Article
Green & Sustainable Science & Technology
Ehsan Zamani Abyaneh, Reza Zarghami, Ulrich Kruehne, Rosinha Grundtvig, Pedram Ramin, Navid Mostou
Summary: A computational fluid dynamic model was developed to assess the mixing efficiency of an industrial anaerobic digestion reactor. The mixing was evaluated by examining parameters such as velocity patterns, dead zones, and residence time distribution. Dead zones were observed in both the mixing section and the expanded sludge bed section.
Article
Engineering, Chemical
Hamed Aali, Saman Kazemi, Roxana Saghafian Larijani, Reza Zarghami, Navid Mostoufi
Summary: This study aims to simulate the breakage of nonspherical rod-shaped particles in a pseudo-2D fluidized bed using a coupled computational fluid dynamics and discrete element method. The effect of inlet gas velocity and size of particles on breakage rate and bed height was examined. It was observed that the breakage phenomenon is more severe at the beginning of simulation, and its intensity decreases over time. The breakage rate is directly related to the diameter of constituent spheres of particles and fluidization gas velocity, and most breakages occur near the bed wall.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Pharmacology & Pharmacy
Monir Sheibani, Farhang Jalali-Farahani, Reza Zarghami, Sima Sadrai
Summary: This study developed an integrated mathematical model of the insulin signaling network, which can simulate the signaling events more comprehensively with the added key components. The proposed model accurately simulates the trends of all signaling components and can be used for better understanding of the causes and potential treatment of type 2 diabetes.
CURRENT PHARMACEUTICAL DESIGN
(2023)
Article
Engineering, Chemical
Hamed Hoorijani, Behrad Esgandari, Reza Zarghami, Rahmat Sotudeh-Gharebagh, Navid Mostoufi
Summary: This study investigates the heat transfer characteristics of spout-fluid beds using computational fluid dynamics and discrete element method. The results show that the jet-in-fluidized bed flow regime exhibits higher heat transfer efficiency due to the presence of bubbles in the annulus. The spouting-with-aeration flow regime demonstrates better convective heat transfer compared to the intermediate/spout-fluidization flow regime.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Review
Engineering, Chemical
Hamid Reza Norouzi, Shahab Golshan, Reza Zarghami
Summary: This article investigates the accuracies, implementation issues, and limitations of drag force models for various systems, collecting data points from multiple sources to evaluate their performance. A comprehensive discussion on the accuracy and application of these models, specifically on mono-dispersed and poly-dispersed spherical particles, is provided in the article.
CHEMICAL PRODUCT AND PROCESS MODELING
(2022)
Article
Mechanics
Nicolas Bouvet, Savannah S. Wessies, Eric D. Link, Stephen A. Fink
Summary: This study presents a framework to characterize firebrand flows and compare exposure through the use of a measurement device and data processing methods. The ability to perform exposure comparisons and recognize combustion states is demonstrated.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
P. Botticini, G. Lavalle, D. Picchi, P. Poesio
Summary: This study investigates the gravity-driven liquid layer problem on an inclined plate, taking into account the variable density of the fluid. The study examines the influence of density variation on the formulation of a depth-averaged model and the role of compressibility in long-wave interfacial instability.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Jean-Paul Caltagirone
Summary: This article introduces a method for modeling capillary flows on a surface or at the interface of two fluids. The method involves handling the two components of capillary acceleration using the divergence and curl of surface normal. The proposed formulation is characterized by directional curvature based on dihedral angle, intrinsic anisotropic surface tension per unit mass, and introduction of capillary potential.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Qi-Teng Zheng, Chun-Bai-Xue Yang, Shi-Jin Feng, Yu-Chen Song, Yong Zhao, Yu-Lin Wu
Summary: This paper proposes a new two-phase partitioning boundary model to accurately predict the drying process of a porous medium from saturated to unsaturated conditions. The model is validated through laboratory soil drying tests and the study also investigates the effects of air-water interfacial area and water retention parameters on the drying process.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Alexandra Metallinou Log, Morten Hammer, Svend Tollak Munkejord
Summary: Flashing flow is commonly found in industrial systems and accurate flashing models are essential for the design of safe and efficient CO2 transportation systems. We propose a homogeneous flashing model that takes into account the physical phenomena of phase change. The model is fitted using CO2 pipe depressurization data and we find that the same model parameters can be applied for different cases.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Q. Tan, S. A. Hosseini, A. Seidel-Morgenstern, D. Thevenin, H. Lorenz
Summary: The possible impact of temperature differences during crystal growth is investigated in this study. A numerical model is developed to simulate the crystallization dynamics of (S)-mandelic acid, taking into account temperature effects. The study shows that the heat generation at the crystal interface has only a small effect on the surrounding temperature field.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Hideki Murakawa, Sana Maeda, Sven Eckert
Summary: This study investigates the behavior of bubbles in a liquid metal under the influence of a magnetic field, particularly bubble chains. The results show that increasing the magnetic field strength suppresses the oscillations of the bubbles and concentrates their crossing positions in a specific area. Applying these findings to numerical models can further optimize continuous casting processes.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Johanna Potyka, Kathrin Schulte
Summary: This paper presents an advanced Volume of Fluid (VOF) method for performing three-dimensional Direct Numerical Simulations (DNS) of the interaction of two immiscible fluids in a gaseous environment with large topology changes. The method includes efficient reconstruction of phase boundaries near the triple line using a Piecewise Linear Interface Calculation (PLIC) method and enhanced surface force modeling with the Continuous Surface Stress (CSS) model. Implementation of these methods in the multi-phase flow solver Free Surface 3D (FS3D) yielded successful validation. The simulations provide valuable insights into the collision process and can support future modeling of immiscible liquid interaction.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Martin Rohde, Sebastian Burgmann, Uwe Janoske
Summary: This study investigates the effect of superimposing an incident flow and two-dimensional vibration on the critical air flow velocity required for the detachment of a droplet. The results show that oscillatory excitation at specific frequencies can significantly reduce the critical velocity for droplet detachment.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Tea-Woo Kim, Baehyun Min
Summary: Liquid-gas two-phase slug flow is a complex flow pattern in energy systems, and accurately predicting slug liquid holdup is crucial for system design and operation. Existing HLLS models have limited applicability due to a lack of physical basis. This study proposes a new dimensionless number SP and correlates it with HLLS data, resulting in a unified HLLS correlation that agrees closely with experimental data.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Christian Lieber, Stephan Autenrieth, Kai-Yannic Schoenewolf, Amy Lebanoff, Rainer Koch, Sterling Smith, Paul Schlinger, Hans-Joerg Bauer
Summary: The observation of acoustically levitated droplets offers great potential for studying their evaporation characteristics. The main objective of this study is to present an experimental setup that minimizes the disturbing effects of the levitation technique in order to investigate convective heat and mass transfer during droplet evaporation.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Facundo Cabrera-Booman, Nicolas Plihon, Mickael Bourgoin
Summary: The settling behavior of individual spheres in a quiescent fluid was experimentally studied. The mean trajectory angle with the vertical showed complex behavior as the parameters Gamma and Ga varied. The transition from planar to non-planar trajectories and the emergence of semi-helical trajectories were observed, especially for denser spheres.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Hongbin Wang, Hanwen Luo, Jinbiao Xiong
Summary: This article introduces an iterative screening method for closure models in nucleate boiling flow simulation, and demonstrates its accuracy through experiments.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Alexandra Metallinou Log, Morten Hammer, Han Deng, Anders Austegard, Armin Hafner, Svend Tollak Munkejord
Summary: This study investigates the rapid depressurization of liquid CO2 and compares the predictions of different models. It is found that higher temperatures result in shorter relaxation times.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Rizwan Zahoor, Sasa Bajt, Bozidar Sarler
Summary: This numerical study evaluates the jet characteristics of non-Newtonian power-law fluids in a gas dynamic virtual nozzle. The results show that shear-thinning fluids result in thicker, longer, and slower jets compared to shear-thickening fluids. Additionally, a dripping-jetting phase diagram of the nozzle is obtained by varying the power law index, gas, and liquid flow rates.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)