Article
Multidisciplinary Sciences
G. P. Vanitha, K. C. Shobha, B. Patil Mallikarjun, U. S. Mahabaleshwar, Gabriella Bognar
Summary: This study investigates the unsteady Casson nanoliquid film flow over a surface moving with velocity U-w = lambda x/ t. The governing momentum equation is simplified using a similarity transformation and solved numerically. The study analyzes both two-dimensional and axisymmetric film flows. The exact solution is obtained for a specific range of the moving surface parameter lambda. The study also considers the streamline patterns for axisymmetric and two-dimensional flows under stretching and shrinking wall conditions. This research is important for understanding the application of Casson nanoliquid film flow in industries such as coating, laboratories, and painting.
SCIENTIFIC REPORTS
(2023)
Article
Multidisciplinary Sciences
Kanayo Kenneth Asogwa, B. Shankar Goud, Nehad Ali Shah, Se-Jin Yook
Summary: This study investigates the influence of Dufour effect, activation energy, and heat generation on the electromagnetohydrodynamic flow of a hyperbolic tangent nanofluid over a stretching sheet. The results show that the activation energy retards the concentration distribution of the nanofluid, while the temperature rise is related to the increase in Dufour effect. The electromagnetohydrodynamic variable affects the velocity distribution and the heat transfer rate is inhibited when certain parameters are enhanced.
SCIENTIFIC REPORTS
(2022)
Article
Mathematics, Applied
Muhammad Imran Asjad, Muhammad Haris Butt, Muhammad Armaghan Sadiq, Muhammad Danish Ikram, Fahd Jarad
Summary: This paper investigates the unsteady flow of a fractional Casson fluid in the presence of bioconvection. The governing equations are modeled using fractional derivatives and transformed into dimensionless form. The analytical solution is obtained using Laplace transform technique and graphs are generated to illustrate the effects of various parameters. The results show that for large time, the temperature and bioconvection reach their maximum values away from the plate, exhibiting dual behavior in their boundary layers. The findings are consistent with recent literature.
Article
Thermodynamics
Amirhossein Mostafavi, Ankur Jain
Summary: The study presents an integral method based analytical model to predict the heat flux distribution from a flat plate with time-varying and spatially-varying temperature. The model is found to be in good agreement with finite-element simulations and can be applied to a broad variety of engineering systems involving convective heat transfer.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Multidisciplinary Sciences
Wan Faezah Wan Azmi, Ahmad Qushairi Mohamad, Lim Yeou Jiann, Sharidan Shafie
Summary: Nano-cryosurgery is an effective method for treating cancer cells with minimal harm to healthy cells. A mathematical simulation model is developed to investigate the unsteady flow of Casson nanofluid in an artery with the convective effect. The results show that adding gold nanoparticles enhances tissue thermal conductivity and significantly improves the freezing effect in nano-cryosurgery.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Multidisciplinary
Muhammad Shoaib Arif, Muhammad Jhangir, Yasir Nawaz, Imran Abbas, Kamaleldin Abodayeh, Asad Ejaz
Summary: This paper investigates the heat and mass transfer of Maxwell nanotluid flow over a heated stretching sheet. A mathematical model is constructed and solved using the Shooting Method. The results provide insights for researchers working on unresolved difficulties in the field of industrial and engineering enclosures.
CMES-COMPUTER MODELING IN ENGINEERING & SCIENCES
(2022)
Article
Thermodynamics
Salman Al Zahrani, Mohammad S. Islam, Suvash C. Saha
Summary: The study aims to improve the thermal performance of flat plate heat exchangers by introducing two newly developed modified versions. Experimental and numerical analyses show that FPHEm2 outperforms its counterparts, reducing pressure drop and enhancing heat transfer rate. This suggests that FPHEm2 could be a viable replacement for traditional flat plate heat exchangers.
APPLIED THERMAL ENGINEERING
(2021)
Article
Engineering, Multidisciplinary
Umair Khan, Aurang Zaib, Ioan Pop, Sakhinah Abu Bakar, Anuar Ishak
Summary: This study investigates the buoyancy effect on time-dependent flow and heat transfer induced by a hybrid micropolar nanofluid over a permeable shrinking or stretching vertical flat plate. The analysis reveals significant insights into the behavior of the solution under different controlling parameters and for both stretching and shrinking cases.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Thermodynamics
Ramzan Ali, Azeem Shahzad, Kaif Us Saher, Zaffer Elahi, Tasawar Abbas
Summary: This study numerically analyzes the thermophysical properties of base fluid with different-shaped Al2O3 particles in the unsteady thin film flow heat transfer. The results show that Al2O3 nanoparticles in a platelet form have a high flow and heat transfer rate.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Mathematics
Noor Farizza Haniem Mohd Sohut, Siti Khuzaimah Soid, Sakhinah Abu Bakar, Anuar Ishak
Summary: The problem of an unsteady 3D boundary layer flow induced by a stretching sheet in a rotating hybrid nanofluid is investigated numerically. It is found that increasing the nanoparticle volume fraction enhances the skin friction coefficient, while increasing the rotation parameter decreases both the skin friction coefficient and the heat transfer rate at the surface.
Article
Multidisciplinary Sciences
Ilyas Zeeshan, Ilyas M. Khan, Syed Eldin, Saeed Islam, M. Uzair Khan
Summary: In this study, the heat transmission analysis of nanofluid movement on a porous extending sheet was examined, and the influence of nonlinear thermal radiation, buoyancy force, and slip at the boundary was also considered. The governing partial differential equations were transformed into ordinary differential equations through suitable transformations and solved numerically using bvph2. The Skin Friction and Nusselt number were investigated for different nanoparticles. The novelty of this study lies in the numerical examination of nanofluid flow with heat transfer and slip effect on an extending sheet.
SCIENTIFIC REPORTS
(2023)
Article
Thermodynamics
Ailian Chang, Kambiz Vafai, HongGuang Sun
Summary: The study investigates the unsteady flow and heat transfer characteristics of non-Newtonian power-law fluid over an oscillating flat plate, using the power-law fluid model and solutions obtained through the radial basis function collocation method and finite element method. The results demonstrate a high level of reliability in dealing with crude oil flow.
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
(2021)
Article
Mathematics, Interdisciplinary Applications
M. Safdar, M. Ijaz Khan, S. Taj, M. Y. Malik, Qiu-Hong Shi
Summary: The study focuses on obtaining Lie point symmetries for the system of partial differential equations describing flow and heat transfer in a thin liquid film. The symmetries are used to construct invariants that lead to a reduction in the independent variables of the flow model, resulting in systems of ordinary differential equations for further analysis using the Homotopy analysis method.
CHAOS SOLITONS & FRACTALS
(2021)
Article
Thermodynamics
Amirhossein Mostafavi, Ankur Jain
Summary: This study addresses convective heat transfer on a flat plate where heat flux varies both spatially and temporally, deriving an analytical solution for plate temperature distribution. The approach involves the use of fourth-order Karman-Pohlhausen polynomials and integral form of the energy equation to obtain a non-linear, first order, hyperbolic partial differential equation. Numerical solutions are provided for various heat flux profiles of interest in practical applications, contributing to the understanding and optimization of engineering systems.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Zikang Zhang, Haichuan Cui, Shuaicheng Zhao, Runze Zhao, Tong Wu, Zhichun Liu, Wei Liu
Summary: This study presents an intensive investigation of a flat-plate evaporator loop heat pipe (LHP) using experimental and simulation methods. The vapor leakage problem was solved by filling the assembly clearance with epoxy glue, and the operating performance of the flat-plate LHP system was verified. An efficient 3-D CFD computational model was built to simulate the heat and mass transfer process in the evaporator. The model exhibited high accuracy with an error less than 10.29%.
APPLIED THERMAL ENGINEERING
(2023)
Article
Chemistry, Physical
Jinghua Li, Mohammad Hatami, Yalong Huang, Bing Luo, Dengwei Jing, Lijing Ma
Summary: This study developed a facile method to prepare noble-metal-free photocatalysts by in situ hybridization of non-noble metal copper nanoparticles with TiO2. Cu nanoparticles greatly enhanced the photocatalytic hydrogen production rate, providing a low-cost and high-efficiency approach for practical application of emerging technology.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Acoustics
Parvin Mahmoudabadi, Mahsan Tavakoli-Kakhki, S. Hassan HosseinNia
Summary: This paper presents a controller design method for the AFM system based on a fuzzy model and linear matrix inequality formulation. The proposed method accurately represents the system and effectively suppresses chaos and reduces disturbance.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Chemistry, Physical
Fei Xue, Haochen Wu, Yuting Liu, Moya Min, Mohammad Hatami, Naixu Li, Maochang Liu
Summary: An ideal composite model made of CuS nanosheet and g-C3N4 was constructed, utilizing the dual photo-chemical effect and photothermal effect. The optimized CN/CuS composite exhibited significantly improved photocatalytic performance, attributed to the inherent characteristics of CuS as a photochemical component. The contribution of photothermal effect in enhancing water photosplitting was experimentally verified.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Metallurgy & Metallurgical Engineering
Mehdi Safari, Ricardo Alves de Sousa, Jalal Joudaki
Summary: In this study, the bending of mild steel tubes was investigated using a laser beam. The effects of six process parameters on the bending angles were examined. The results showed that increasing laser power, irradiation length, and number of irradiation passes, as well as reducing scanning speed and laser beam diameter, led to higher bending angles.
STEEL RESEARCH INTERNATIONAL
(2023)
Article
Automation & Control Systems
Ali Ahmadi Dastjerdi, Alessandro Astolfi, Niranjan Saikumar, Nima Karbasizadeh, Duarte Valerio, S. Hassan HosseinNia
Summary: This article presents a closed-loop frequency analysis tool for reset control systems. It provides sufficient conditions for the existence of steady-state response and shows that the steady-state response for periodic inputs is periodic with the same period as the input. The framework presented in this article allows for the computation of steady-state response and defines a notion of closed-loop frequency response, including high order harmonics.
IEEE TRANSACTIONS ON AUTOMATIC CONTROL
(2023)
Article
Automation & Control Systems
Nima Karbasizadeh, Ali Ahmadi Dastjerdi, Niranjan Saikumar, S. Hassan HosseinNia
Summary: This article discusses the nonlinearity and effects of reset elements. Reset elements have less phase lag based on describing function (DF) analysis compared to their linear counterparts, but they produce higher-order harmonics. The article investigates the steady-state higher-order harmonics for reset elements with one resetting state and proposes an architecture and design method to band-pass the nonlinearity and its effects.
IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY
(2023)
Article
Mathematics, Applied
Adel Karimbakhshi Rostami, Davood Domiri Ganji
Summary: This study investigates the heat transfer in a shell and helically coiled finned tube heat exchanger with stepped annular fins for the first time. Using response surface methodology, correlations are proposed to predict the Nusselt number based on geometric and operating parameters. The results show that the parameters Re and Pr have the most impact on the Nusselt number.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2023)
Article
Physics, Multidisciplinary
Elham Tayari, Leila Torkzadeh, Davood Domiri Ganji, Kazem Nouri
Summary: This research investigates the non-Newtonian natural convection of a hybrid nanofluid consisting of single-wall carbon nanotubes (SWCNT) and multi-wall carbon nanotubes (MWCNT) based on methanol fluid between two parallel vertical plates. The collocation method based on radial basis functions (RBF) is used to solve the reduced ordinary differential equations. The results obtained using the RBF method are in good agreement with the numerical method, demonstrating the effectiveness of the RBF method. The velocity distribution and boundary layer thickness are influenced by the hybrid nanotubes volume fraction.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Thermodynamics
H. Nabi, M. Gholinia, D. D. Ganji
Summary: The present study investigated the increase in heat transfer rate of a microchannel heatsink with high heat flux using topology structures and CNTs nanofluids. Four nature-inspired topology structures were compared with a straight microchannel heatsink. The spider netted model showed the highest heat transfer coefficient and pressure changes. The use of SWCNT-H2O nanofluid increased the heat transfer coefficient and pump power by 56.1% and 46.1% respectively at a Reynolds number of 550.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Mechanics
S. A. Abdollahi, P. Jalili, B. Jalili, H. Nourozpour, Y. Safari, P. Pasha, D. D. Ganji
Summary: This study investigates the flow and thermic field characteristics of a coherent nanofluid-guided microchannel heat sink. It evaluates the cooling effect of a hybrid blend of copper and aluminum nanoparticles added to water. The results show that increasing the volume fraction of nanoparticles lowers the temperature and improves the heat transmission rate.
THEORETICAL AND APPLIED MECHANICS LETTERS
(2023)
Article
Engineering, Mechanical
Mehran Mohammadi, Khashayar Hosseinzadeh, Davood Domiri Ganji
Summary: This article presents a novel design of a vortex chamber with axial grooves for cooling the leading edge of turbine blades. The chamber generates a vortex through nine tangential inlets and includes an axial groove. The grooves enhance flow turbulence and increase heat transfer by disrupting the thermal boundary layer. Using a 3D model based on the Reynolds-averaged Navier-Stokes equation, different turbulent models and experimental data were compared, with the Reynolds stress model (RSM) showing the highest accuracy. Various groove sizes, positions, and numbers were examined to study the vortex structure and heat transfer mechanism. The results revealed improved heat transfer in the chamber with grooves, especially with three grooves resulting in an average Nusselt number increase of over 4%. The pressure difference between chambers with and without grooves was not significant, but the highest friction factor occurred in the case with three grooves.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(2023)
Article
Energy & Fuels
M. Sheikholeslami
Summary: The influence of porous media on the solidification of water with hybrid nanoparticles has been simulated in this study. A tree-shaped fin and the impact of radiation were utilized to expedite the process. The hybrid nanomaterial consisted of a mixture of Al2O3 and CuO with a volume fraction of 0.01 for each powder type, making the homogeneous mixture approximation logical. A wiremesh packed approach was used to model the porous foam, and the impact of porosity on the freezing process was analyzed. The temperature equation, including two source terms for radiation and phase changing, was considered, and the Galerkin method was implemented for solving the equations.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Engineering, Multidisciplinary
M. H. Pahlavanian, Davood Domiri Ganji
Summary: Arterio-venous grafts (AVGs) are commonly used for long-term vascular access in hemodialysis. Intimal hyperplasia (IH) caused by unfavorable hemodynamic conditions is the main reason for AVG failure. This study utilizes computational fluid dynamics (CFD) to assess the impact of different geometrical designs on the hemodynamic conditions at the venous anastomosis. The results show that optimizing the anastomosis angle and introducing cross-sectional ridges in the graft can significantly reduce the risk of IH development.
RESULTS IN ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
A. K. Rostami, D. D. Ganji
Summary: In this study, the authors investigated the performance of a shell and helically coiled finned tube heat exchanger using numerical and experimental methods. They examined the heat exchanger with simple annular fins for the first time and proposed four new fin geometries, selecting the stepped fin geometry as the superior design. The authors developed correlations to predict the mean Nusselt number on both the shell and tube sides, with good accuracy (maximum 10% error) for calculating the Nusselt numbers. The results showed that the mean Nusselt number of the coil side was consistent across all geometries, and the Reynolds number had little effect on the mean Nusselt number on the other side.
RESULTS IN ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
U. S. Mahabaleshwar, T. Anusha, M. Hatami
Summary: This paper investigates the unsteady stagnation-point flow of a hybrid nanofluid over a stretching/shrinking sheet embedded in a porous medium with mass transpiration and chemical reactions. Analytical solutions for velocity and concentration profiles are obtained, and the effects of different physical parameters on the flow field are examined.
FDMP-FLUID DYNAMICS & MATERIALS PROCESSING
(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.
