Article
Thermodynamics
S. Saqib Shah, Rizwan Ul Haq, Wael Al-Kouz
Summary: This study explores the thermal performance of nanofluid enclosed by a split lid-driven trapezoidal cavity with an elliptic shaped obstacle. Various parameters such as Richardson number, Lewis number, Reynolds number, and buoyancy ratio are analyzed for their effects on velocity, temperature, and concentration profiles. The findings indicate that Lewis number has a significant impact on isotherms and concentration, while smaller buoyancy ratios result in maximum heat transfer near the lid walls.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Engineering, Multidisciplinary
Nemat Ebrahimi, Hossein Ahmadi Danesh Ashtiani, Davood Toghraie
Summary: The mixed convection of nanofluid within an inclined trapezoidal cavity in the presence of a magnetic field was explored using the lattice Boltzmann method. The study found that increasing the Rayleigh number and decreasing the Richardson number improves heat transfer. Increasing the volume fraction of nanoparticles leads to a higher average Nusselt number. However, increasing the Hartmann number reduces heat transfer. Altering the cavity's slope and the magnetic field's angle also has an effect on the flow and heat transfer. Applying a magnetic field has a more pronounced impact on heat conduction.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2023)
Article
Engineering, Multidisciplinary
Rowsanara Akhter, Mohammad Mokaddes Ali, M. A. Alim
Summary: This investigation explores the fluid flow and temperature behaviors, as well as entropy generation, of hybrid nanofluid in a partially heated cavity saturated by porous medium in the presence of an external magnetic field. The results show that the magnetic field strength, amount of hybrid nanoparticles, and cavity permeability have a significant influence on the fluid flow, temperature, and local entropy generation.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Thermodynamics
M. Zaka Ullah, Rizwan Ul Haq, S. T. Hussain, A. Khamis Alzahrani, Fouad Mallawi
Summary: The thermal performance of working fluids is crucial in the industrial age. Studies have shown that single wall carbon nanotubes (SWCNTs) mixed with water can enhance thermal properties compared to ordinary water. By adjusting parameters such as Rayleigh number, heat generation parameter, and flame size, researchers have examined the effects of SWCNTs nanofluids in a trapezoidal cavity with a flame-shaped heated source on thermal distribution and flow pattern. The study highlights the importance of nanoparticle shape in achieving optimal thermal performance and demonstrates that free convection and heat generation significantly impact isotherms and streamlines. The presence of carbon nanotubes increases the temperature profile inside the cavity, and a higher nanoparticle volume fraction leads to increased heat transfer rate.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
N. F. M. Noor, Rizwan Ul Haq, H. F. Wong, A. Khamis Alzahrani, M. Zaka Ullah
Summary: The main emphasis of this study is to investigate the forced convection and heat transfer of magnetohydrodynamics flow generated by a moving lid in a trapezoidal enclosure. Numerical simulations are conducted to analyze the effect of different thermal conditions on the flow and heat transfer performance of the cavity with an inner circular obstacle.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Hijaz Ahmad, Rashid Mahmood, Muhammad Bilal Hafeez, Afraz Hussain Majeed, Sameh Askar, Hasan Shahzad
Summary: This study focuses on the numerical simulations of fluid flow with Ostwald-de Waele characteristics in a wavy trapezoidal cavity. The effects of heat flow intensity on mixed convection are investigated, and the flow behavior and temperature distribution in the cavity are analyzed. The study shows velocity profiles, streamlines, and isotherms to illustrate the major findings, as well as determining the kinetic energy and average Nusselt number for different parameters.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Mechanics
Sapna Jain, Surabhi Nishad, Rama Bhargava
Summary: This paper investigates the effect of double diffusion natural convection fluid flow inside a double wavy enclosure using the mesh-free method. The results show that the mass and heat transfer rates increase with an increase in the Rayleigh number and buoyancy ratio, while they decrease with an increase in the thermophoresis parameter, Lewis number, Brownian motion, and power-law index. Such enclosures have applications in heat exchanger devices, double-wall thermal insulation systems, and microelectronic devices.
Article
Thermodynamics
Naeem Ullah, Sohail Nadeem, Arif Ullah Khan
Summary: Numerical simulations were conducted to investigate natural convection in a rectangular cavity containing CuO-water nanofluid. The results showed that thermal distribution and flow field became stronger with increasing Rayleigh numbers and wavelength numbers. The increase in nanoparticle volume fraction was found to enhance heat transfer rate due to dominant convection.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Thermodynamics
Hasib Ahmed Prince, Didarul Ahasan Redwan, Enamul Hasan Rozin, Sudipta Saha, Mohammad Arif Hasan Mamun
Summary: The study investigated mixed convection inside a trapezoidal cavity with a pair of rotating cylinders using numerical simulations. The Nusselt number was found to vary nonlinearly with different angular speeds of the cylinders, with heat transfer in the system being influenced by the combined effects of cylinder rotation-induced mixing and fluid viscosity characteristics. Insights into key parametric configurations influencing thermal performance of the system were provided by the numerical investigation.
JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME
(2021)
Article
Multidisciplinary Sciences
Mohedul Hasan, Shadman Sakib Priam, Abrar Nur-E Faiaz, A. K. Azad, M. M. Rahman
Summary: This study numerically investigates the time-dependent thermal conductivity effect of an annular cylinder within a vented cavity using CNT based-water nanofluid. The results demonstrate that the decrease of solid thermal conductivity leads to a 27.3% enhancement in thermal transport from the heated surface of the cylinder. However, an increase of 16.3% in the bulk fluid temperature is observed with an increase in cylinder conductivity. The numerical outcomes propose better thermo-fluid efficiency compared to existing methodology, providing guidance for engineers and researchers in designing thermal systems.
Article
Mechanics
Aneela Bibi, Hang Xu
Summary: This article investigates fluid dynamics and heat transfer properties in a trapezoidal enclosure containing a heated cylindrical object. It explores the interaction of multiple physical processes and analyzes the governing equations numerically. The findings demonstrate the various factors influencing the thermal and mass transfer in the enclosure, and the effectiveness of the multiple expression programming (MEP) technique in predicting heat transfer behavior.
Article
Thermodynamics
Shafqat Hussain, Muhammad Jamal, B. Pekmen Geridonmez
Summary: This study investigates the impact of fins and inclined magnetic field on nanofluid heat transfer in lid-driven cavities through numerical simulations. The presence of fins significantly affects fluid flow and heat transfer, with differences observed between adiabatic and isothermal fins.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Multidisciplinary Sciences
Wubshet Ibrahim, Mohammed Hirpho
Summary: A two-dimensional flow analysis was conducted in a cavity shaped isosceles trapezium, considering the effects of magnetic field, temperature, and other dominant parameters. The results showed that the thickness of the boundary layer on the upper wall decreases with an increase in Richardson number Ri, while the Nusselt number on the bottom wall increases with the amplitude of temperature oscillation. Additionally, it was found that the average Nusselt number decreases with an increase in magnetic field intensity.
Article
Engineering, Multidisciplinary
Mohammad Mokaddes Ali, Rowsanara Akhter, Md. Abdul Alim
Summary: The study investigated mixed convection in a nanofluid filled cavity, showing that the variations in length and speed of the rotating flat plate significantly affect flow and thermal fields. Additionally, nanoparticle concentration and magnetic field strength play a role in heat transfer performance.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Multidisciplinary Sciences
Madhu Aneja, Sapna Sharma
Summary: This study investigates the heat transfer characteristics of hybrid nanofluid in a square porous cavity. The results show that an increase in the percentage of hybrid nanofluid and Darcy number enhances heat transfer and circulation intensity, while an increase in the volume fraction of nanoparticles enhances heat transfer rate in the porous medium.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Mechanical
Kotha Gangadhar, R. Edukondala Nayak, M. Venkata Subba Rao, Ali J. Chamkha
Summary: This paper examines the mechanism of radiative Walter's B nanofluid on a rotational cone under magnetic regime, including the theoretical and practical implications of time-dependent fluid flow caused by cone rotation in engineering and applied sciences, as well as the characteristics of thermophoresis, Brownian motion, and chemical reactions. Self-similar solutions are obtained and the numerical result of a reduced nonlinear system is obtained using the Runge-Kutta-Fehlberg fourth-fifth procedure. Comparisons with previously published material are made to verify the outcome. The conflicting influences of the Brownian motion parameter on heat and mass transfer rates, as well as temperature and concentration fields, are found. The presence of chemical reactions may be more beneficial in developing reaction processes.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(2023)
Article
Engineering, Mechanical
K. Gangadhar, M. Venkata Subba Rao, D. Naga Bhargavi, Ali J. Chamkha
Summary: This research focuses on the hydrothermal characteristics of magnetohydrodynamic nanofluid flow over a slippery permeable bended surface. The study reveals that the concentration gradient of nanoparticles is affected by Brownian motion and thermophoretic force. The results also show that increasing magnetic parameter values decrease the velocity field magnitude and pressure in the boundary layer.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(2023)
Article
Thermodynamics
Dipak Kumar Mandal, Nirmalendu Biswas, Nirmal K. Manna, Rama Subba Reddy Gorla, Ali J. Chamkha
Summary: This study numerically examines the influence of various geometric parameters on the thermal performance of a novel W-shaped porous cavity undergoing hybrid nanofluid-based magnetohydrodynamic mixed convection. The results show that an increase in the bottom undulation height improves the thermal energy transfer despite the reduction of fluid volume. The overall thermal energy transport is improved by increasing Reynolds number, Richardson number, and Darcy number, while it is suppressed by increasing Hartmann number.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2023)
Article
Engineering, Mechanical
Bhupendra Kumar Sharma, Umesh Khanduri, Nidhish K. Mishra, Ali J. Chamkha
Summary: This study numerically investigates the combined effects of Arrhenius activation and microorganisms on unsteady flow through a porous medium with thermophoresis and Brownian motion. The results have important implications for geothermal engineering, energy conversion, disposal of nuclear waste material, as well as applications in medical fields such as gene therapy and drug delivery systems.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(2023)
Article
Thermodynamics
Hussan Zeb, Hafiz A. Wahab, Umar Khan, Ali J. Chamkha
Summary: This study analyzed the characteristics of heat transfer in non-Newtonian ferrofluids produced by stretchable sheet and investigated the effects of Arrhenius activation energy and magnetic dipole. By applying a similarity ansatz and Runge-Kutta method, the computational solution for the governing system was determined. The influence of beneficial physical parameters on momentum, energy, and concentration profiles was shown through graphs.
Article
Thermodynamics
Shreedevi Kalyan, Ashwini Sharan, Ali J. Chamkha
Summary: This article examines the effect of heat and mass transfer flow of two immiscible Jeffrey fluids in a vertical channel. The impact of different physical parameters on the flow and distribution of velocity, temperature, and concentration is illustrated graphically.
Article
Energy & Fuels
Ammar I. I. Alsabery, Mohammed J. J. Alshukri, Nasr A. A. Jabbar, Adel A. A. Eidan, Ishak Hashim
Summary: The generation of entropy and mixed convection in a nanofluid-filled 3D wavy tank containing a rotating cylinder is investigated. The effects of Richardson number, nanoparticle volume fraction, and number of oscillations on heat transfer enhancement are studied through numerical simulations using the FEM. The results show that increasing the nanoparticle volume fraction can enhance heat transfer for low values of the Richardson number and oscillation.
Article
Thermodynamics
Alexander Nee, Bubryur Kim, Ali J. Chamkha
Summary: The present study focuses on the numerical analysis of heat transfer and fluid flow patterns in a three-dimensional problem formulation. A hybrid mathematical model is built, and the equations are solved using MATLAB. The results show that the emissivity of the vertical walls can be used as a tool to control thermal and flow behavior.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Physics, Multidisciplinary
M. S. Asmadi, R. Md Kasmani, Z. Siri, H. Saleh
Summary: The numerical analysis of natural convection heat transfer of copper-alumina hybrid nanofluid inside a U-shaped enclosure with adiabatic wavy walls shows significant advantages of the hybrid nanofluid in improving thermal performance compared to its mono nanofluid components and pure water.
WAVES IN RANDOM AND COMPLEX MEDIA
(2022)
Article
Energy & Fuels
Salah M. Salih, Ammar I. Alsabery, Ahmed K. Hussein, Muneer A. Ismael, Mohammad Ghalambaz, Ishak Hashim
Summary: The paper investigates the forced fluid flow within a horizontal channel containing two semi-cylinders and two flexible baffles. The melting of phase change material, convective and conductive heat transfers, and fluid-structure interaction are considered. The influential parameters are dimensionless time, elasticity modulus of the baffles, and Reynolds number. The results show that increasing Reynolds number and decreasing elasticity modulus lead to a decrease and increase, respectively, in the melting volume fraction.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Green & Sustainable Science & Technology
Naseer Abboodi Madlool, Mohammed J. Alshukri, Ammar I. Alsabery, Adel A. Eidan, Ishak Hashim
Summary: This paper investigates the convective heat transfer of laminar forced convection in a wavy channel. Numerical simulations using the finite element method are performed to obtain the 3D steady flow and heat transfer characteristics of Newtonian fluid. The study analyzes the effects of Reynolds number (10 < Re < 1000), number of oscillations (0 < N < 5), and wall amplitude (0.05 < A < 0.2) on the heat transfer. The results show that the average Nusselt number increases with the Reynolds number, and the number of oscillations and wall amplitude also affect the heat transfer.
INTERNATIONAL JOURNAL OF RENEWABLE ENERGY DEVELOPMENT-IJRED
(2023)
Article
Thermodynamics
Abeer Alhashash, Habibis Saleh
Summary: Transient free convection in a composite enclosure with a cold flexible plate and a hot rigid plate is simulated numerically. The fluid-structure interaction is solved using the Arbitrary-Lagrangian-Eulerian (ALE) approach. The development of convective flow goes through initial, transitional, and stationary states, with the shape of the flexible plate varying depending on the Darcy regime.
ADVANCES IN MECHANICAL ENGINEERING
(2023)
Article
Energy & Fuels
Abeer Alhashash, Habibis Saleh
Summary: The conjugate heat transfer in a differentially heated enclosure with an active cylinder placed at the center-line is numerically studied. Water (H2O) and nano-encapsulated phase change materials (NEPCMs) are filled in the free space between the cylinder and the walls of the enclosure. The placement of the peak Nusselt number values is heavily influenced by the rotational direction.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Energy & Fuels
Abeer Alhashash, Habibis Saleh
Summary: The numerical study focused on the effect of heating exponent and frequency on the convective flow and melting distribution inside a square enclosure filled with hybrid nanofluid. The study used a Galerkin finite element method to solve the governing equations and compared the results with previously published articles. The research found that the lowest heating exponent and frequency resulted in the best thermal performance.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
L. Syam Sundar, Solomon Mesfin, E. Venkata Raman, V. Punnaiah, Ali J. Chamkha, Antonio C. M. Sousa
Summary: The study demonstrates that using hybrid nanofluids with coiled wire inserts in a tube can significantly enhance heat transfer performance and reduce thermal entropy generation, thereby increasing the exergy efficiency of water flow.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
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.
