Article
Engineering, Aerospace
Junlong Wang, Ningfei Wang, Xiangrui Zou, Wei Dong, Yintao Zhou, Dingjiang Xie, Baolu Shi
Summary: This study investigates the characteristics and influencing factors of aluminum combustion efficiency in solid rocket motors through experiments and numerical simulations, providing guidance for engine performance improvement.
CHINESE JOURNAL OF AERONAUTICS
(2023)
Review
Engineering, Mechanical
N. Matos, M. Gomes, V. Infante
Summary: This review study discusses various methods for soft body collision modeling, including mesh and mesh-free simulation models, as well as approaches such as Eulerian and Lagrangian methods. These methods play an important role in reducing development and testing costs and are significant for protecting aircraft, automobiles, etc.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Mathematics, Applied
Vaclav Heidler, Ondrej Bublik, Ales Pecka, Jan Vimmr
Summary: This paper investigates the Eulerian-Lagrangian and Eulerian-Eulerian approaches for simulating the interaction between free surface flow and particles. The lattice Boltzmann method with direction-dependent stabilization is proposed to minimize artificial diffusion in particle transport, and the particulate immersed boundary method is used to ensure the interaction between the fluid and particles. The developed schemes are compared and validated against literature results for free surfaces flow with complex geometries.
JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS
(2021)
Article
Engineering, Chemical
Bijan Darbari, Mohammad Bagher Ayani
Summary: A two-phase numerical study of CuO-water nanofluid flow with consecutive baffles in a constant heat flux channel was conducted using a modified Lagrangian solver in OpenFOAM. It was found that increasing the baffle height ratio can improve the Nusselt number by up to 85%, but also increases nanoparticle deposition in the channel. Decreasing the baffle spacing ratio has similar effects, increasing the Nusselt number and deposition by about 34% and 17%, respectively. Furthermore, particle deposition on the baffles was significantly higher than on the walls of the channel.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2023)
Article
Water Resources
Daniel Wildt, Christoph Hauer, Helmut Habersack, Michael Tritthart
Summary: In this study, a Euler-Lagrangian two-way coupled large eddy simulation was used to model the development of sediment plume. The momentum exchange was calculated based on interaction forces in the Maxey-Riley equation. The results were validated against experimental data and showed good agreement. The analysis revealed three phases of sediment plume development: acceleration, transport, and deposition. The significant slowing down of fluid flow and particle sorting were identified as important processes in the initial development of sediment plume, which are not accounted for in one-way coupled models.
ADVANCES IN WATER RESOURCES
(2022)
Article
Engineering, Chemical
Yuan Yao, Jesse Capecelatro
Summary: This study presents a numerical framework for accurately computing electrically charged particles in wall-bounded flows, removing the contribution from periodic images by agnostically solving the electric Poisson equation and strategically mapping particle charges to the grid, while enforcing appropriate boundary conditions using a signed-distance levelset function.
Article
Computer Science, Interdisciplinary Applications
Xiang Li, Qiang Du, Li Luo, Xiao-Ping Wang
Summary: An energy-stable scheme for simulating fluid-particle interaction problems was developed in this study, utilizing a modified temporary arbitrary Lagrangian-Eulerian method and the extended finite element method. The proposed method is first-order accurate in time and space, but not momentum conservative.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Computer Science, Interdisciplinary Applications
Mohammad Giahi, Donald Bergstrom
Summary: This paper reports the validation and verification of immersed boundary methods implemented in FOAM-Extend version 4.0 and 4.1. The results of five test cases are compared with experimental and numerical data in the literature, showing satisfactory agreement for stationary bodies but spurious force oscillations for moving bodies. A solver based on the Immersed Boundary Surface Method (IBS) is developed to simulate fluid-particle interactions, however, the severity of spurious force oscillations impacting particle motion prediction depends on the particle Stokes number.
COMPUTERS & FLUIDS
(2023)
Article
Engineering, Chemical
Md Tariqul Islam, Anh Nguyen
Summary: This study investigated the effect of particle size and shape on liquid-solid fluidization in a HydroFloat cell using CFD results and experimental data. The modeling approach successfully predicted and validated factors affecting bed expansion, pressure drop, and voidage, leading to improvements in prediction accuracy. These findings are valuable for optimizing the operation of the HydroFloat cell.
Article
Engineering, Multidisciplinary
Hee Sang Yoo, Young Beom Jo, Jin Woo Kim, Eung Soo Kim, Tae Soo Choi
Summary: In this article, a simple, consistent, and robust Eulerian-Lagrangian weakly compressible smoothed particle hydrodynamics (EL-WCSPH) method is proposed for simulating hydrodynamics and convection heat transfer problems. The method utilizes the ALE-SPH framework and allows control of the degree of Eulerian and Lagrangian schemes using a predefined parameter alpha. To address potential numerical errors and inconsistency, particle mass correction and particle disorder correction are introduced. Extensive benchmark simulations confirm the effectiveness of the proposed method in various hydrodynamics and thermal-hydraulics problems.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Cheng Fu, Massimiliano Cremonesi, Umberto Perego
Summary: The dynamics of fluid flows interacting with highly deformable structures is a complex problem. The Particle Finite Element Method (PFEM) is a mesh-based Lagrangian approach that can track fluid boundaries and fluid-structure interaction interface. However, for problems with nonhomogeneous boundary conditions or moderate changes in topology, an Eulerian formulation is more suitable. This work presents an adaptive hybrid Lagrangian-Eulerian approach that combines the advantages of both formulations. Numerical examples are used to validate the proposed method.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2023)
Article
Mechanics
Harshal P. Mahamure, Vagesh D. Narasimhamurthy, Lihao Zhao
Summary: This study investigates the dispersion of tiny inertial particles in the two-dimensional laminar wake of a pair of square cylinders placed side-by-side. The effect of varying the cross-stream spacing between the cylinders on the body impaction and dispersion of particles in the wake flow is examined. The results show that the impaction efficiency of different particles is dependent on the spacing ratio and their Stokes number.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2023)
Article
Engineering, Chemical
Shang Mao, Tao Zhou, Chunhui Xue, Peng Xu, Chunmei Liu
Summary: The deposition characteristics of particles within narrow rectangular channels were investigated using the Eulerian-Lagrangian method. A model was developed to predict the particle deposition behavior, taking particle rebound, deposition, and removal into account. The study focused on the effects of various operating conditions on particle deposition, including inlet velocity, heat flux, particle concentration, particle type, and working fluid. The results showed that the asymptotic values of deposition mass decreased with increasing inlet velocity, but increased with particle concentration. High temperature gradient reduced the deposition mass slightly for dp = 10 gm. It was also found that Al had significantly higher deposition mass than SiO2 at dp = 5 gm, while the deposition masses were basically the same for dp = 10 gm and dp = 20 gm. Shear stress had a distinct effect on removal rate and deposition mass, and supercritical carbon dioxide (SC-CO2) had the largest deposition mass compared to other fluids at the same Reynolds number. The findings of this research are important for simulating particle deposition in narrow rectangular channels of plate fuel elements.
Article
Thermodynamics
Oktay Cicek, Mikhail A. Sheremet, A. Cihat Baytas
Summary: The migration and deposition of MWCNT-Fe3O4 nanocomposite particles in a square enclosure for natural convection hybrid nanofluid flow were analyzed numerically using the Eulerian-Lagrangian model with one-way coupling. The influences of Rayleigh number and nanoparticle volume fraction on the thermal and flow behaviors of the system were presented. The simulations of Lagrangian particle tracking demonstrated that the thermophoresis force played a more significant role in small particle deposition than the Brownian random force.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Environmental Sciences
Abolghasem Pilechi, Abdolmajid Mohammadian, Enda Murphy
Summary: This study presents a new numerical framework for predicting microplastics fate and transport in water bodies. The framework consists of a Lagrangian, three-dimensional particle-tracking model coupled with an Eulerian-based hydrodynamic modeling system. The study investigates the sensitivity of different advection schemes on the model predictions and identifies the Third Order Total Variation Diminishing (TVD3) Runge-Kutta method as the optimal choice.
MARINE POLLUTION BULLETIN
(2022)
Article
Engineering, Chemical
Hamed Mirzaee, Roohollah Rafee, Saman Rashidi, Mohammad Sadegh Valipour
Summary: This study numerically examines the turbulent flow and convective heat transfer of Al2O3-water nanofluid inside a helically corrugated channel. The results show that the presence of nanoparticles affects the viscosity and heat transfer properties of the fluid to some extent. The recirculation region in the corrugation cavity has a significant impact on turbulent mixing.
CHEMICAL ENGINEERING COMMUNICATIONS
(2023)
Article
Engineering, Mechanical
S. Sarvar-Ardeh, R. Rafee, S. Rashidi
Summary: This paper compares the hydrothermal performance of divergent and convergent walls in two-layer microchannels. The results show that divergent walls decrease the pumping power and average Nu number, but increase the thermal resistance and base temperatures. Conversely, convergent walls increase the pumping power and average Nu number, while decreasing the thermal resistance and base temperatures. The study also finds that microchannels with low TF values (more convergent) are more hydrothermally optimal compared to those with high TF values (more divergent). Furthermore, divergent microchannels generate lower frictional entropy and higher thermal entropy, while convergent microchannels produce higher frictional entropy.
EXPERIMENTAL TECHNIQUES
(2023)
Article
Engineering, Mechanical
M. Kalantar, S. Rashidi, F. Hormozi
Summary: This study investigates the flow structure and efficacy of an electrokinetic micromixer with rough walls using a numerical method. It shows that adding roughness to the walls improves the mixing effectiveness significantly, with different roughness shapes having different effects. The direction of wall roughness has a negligible effect on the mixing effectiveness, and decreasing the electric field intensity also increases the mixing effectiveness.
EXPERIMENTAL TECHNIQUES
(2023)
Article
Mathematics, Applied
Sajjad Sarvar-Ardeh, Roohollah Rafee, Saman Rashidi
Summary: When designing microscale heat exchangers, methods such as using nanofluids and convergent walls can help reduce energy dissipation and improve system performance. This study investigates the hydrothermal performance and entropy generation of alumina-silica/water hybrid nanofluid in a double-layer tapered microchannel using three-dimensional simulation. The results show that using a convergent microchannel can decrease surface temperature and temperature gradient, and changing the volumetric fraction of nanoparticles and tapered factor affects the thermal resistance and pumping power of the system.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2023)
Article
Environmental Sciences
Pouya Esfanjani, Ali Mahmoudi, Mohammad Sadegh Valipour, Saman Rashidi
Summary: Solar thermal energy is a promising solution to address the environmental and energy demands. Parabolic dish collectors are preferred due to their high working temperature range and thermal performance. By utilizing a cylindrical-conical cavity receiver equipped with ceramic fiber insulation, the efficiency of the parabolic dish collector can be enhanced.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Thermodynamics
Iman Bashtani, Javad Abolfazli Esfahani, Kyung Chun Kim
Summary: The present investigation evaluates the effects of bio-inspired Dolphin's dorsal fin turbulators in a counter flow double pipe heat exchanger. The results show that the streamlined geometry of the turbulator reduces friction loss and improves heat transfer by destroying the boundary layer.
APPLIED THERMAL ENGINEERING
(2023)
Review
Engineering, Multidisciplinary
Saman Rashidi
Summary: Phase change materials have attracted a lot of attention recently due to their potential for thermal energy storage. Their high latent heat allows for more compact storage units. These materials can be integrated with various energy systems for different applications. Machine learning techniques have been proven to be effective in optimizing and controlling the performance of phase change materials in energy systems.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2023)
Article
Engineering, Multidisciplinary
Zeinab Esmaeili, Sanaz Akbarzadeh, Saman Rashidi, Mohammad Sadegh Valipour
Summary: The simultaneous use of turbulators and nanofluids is an effective strategy for improving the thermal performance of parabolic solar collectors. A three-dimensional numerical simulation was used to investigate the effects of using a turbulator and adding hybrid nanoparticles on the heat transfer rate and entropy generation in a parabolic trough collector. The results showed that the use of conical helical gear rings as turbulators increased the heat transfer by 35.7% and decreased the total entropy generation by 32.8%.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2023)
Article
Thermodynamics
Seyed Mahdi Ekrani, Shayan Ganjehzadeh, Javad Abolfazli Esfahani
Summary: The present study improves the thermal-hydraulic performance of a circular tube equipped with a delta winglet vortex generator by using a numerical model, investigating two additional parameters, and developing a support vector regression (SVR) for prediction and optimization. The presence of delta winglets disrupts the boundary layer and creates swirling flow, leading to enhanced heat transfer but also increased pressure drop. The addition of SiO2 as a nanofluid further enhances heat transfer. The results of this study provide insights into the best arrangement of delta winglets for a tubular heat exchanger.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Engineering, Mechanical
Golnaz Zarabian Ghaeini, Mohammad Parsa Ghofrani Maab, Sayed Mehrdad Bathaei, Mirae Kim, Javad Abolfazli Esfahani, Kyung Chun Kim
Summary: Ammonia is a promising carbon-free fuel and hydrogen carrier. Blending it with hydrogen can address its low flammability issue. However, there is a lack of microscale data on ammonia combustion. This study uses numerical simulations to investigate the stable flame region, NOx emission, and combustion efficiency of ammonia/hydrogen blends in micro-combustors. The findings suggest that a stable flame cannot be achieved at very low or high inlet velocities, and when the hydrogen fraction is below 60% in the fuel. It is recommended to reduce the inlet velocity to improve combustion efficiency when a higher percentage of ammonia is required in the fuel.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2023)
Article
Engineering, Chemical
Mohsen Mosahebi, Saman Rashidi, Mojtaba Mirhosseini
Summary: This study investigates the efficiency of a concave stepped solar water desalination device equipped with an internal reflector. Two devices with different step shapes were tested and compared. The results showed that the device with concave steps had higher efficiency compared to the device with flat steps.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2023)
Article
Thermodynamics
C. J. Ho, Jian-Kai Peng, Tien-Fu Yang, Saman Rashidi, Wei-Mon Yan
Summary: In this experimental study, a mini/micro-channel stacked double-layer heat sink was designed and tested for the first time. The results showed that compared to a single-layer micro-channel heat sink, the stacked double-layer heat sink has better heat dissipation performance and significantly reduced pressure drop.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Review
Chemistry, Physical
Saman Rashidi, Nader Karimi, Guiqiang Li, Bengt Sunden
Summary: This article reviews the recent advances in phase change nanoemulsions for energy applications. It introduces the features and classification of these nanostructured fluids, discusses the preparation methods and thermophysical properties, and covers material synthesis and property characterization. It also reviews the applications of phase change nanoemulsions in different energy systems. The major barriers, including instability and high degree of supercooling, are discussed.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Engineering, Multidisciplinary
C. J. Ho, Jian-Kai Peng, Tien-Fu Yang, Saman Rashidi, Wei-Mon Yan
Summary: This study investigates the performance of a novel double-layer mini/micro-channel stacked heat sink, which reduces pressure loss compared to a single-layer micro-channel heat sink and improves uniformity index, leading to decreased operating costs.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Sajjad Sarvar-Ardeh, Roohollah Rafee, Saman Rashidi
Summary: Using lithium-ion batteries in electric vehicles is a suitable replacement for fossil fuels, but there are challenges such as temperature increase and the risk of fires and explosions. A study using numerical simulation found that using porous material in cold plate mini-channels can improve convection heat transfer and enhance the thermal management of liquid-based batteries. Fully porous channels with a parallel-flow arrangement are recommended for optimal cooling performance.
JOURNAL OF ENERGY STORAGE
(2023)
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.
