Article
Chemistry, Physical
M. Zubair Akbar Qureshi, S. Bilal, M. Bilal Ameen, Tahir Mushtaq, M. Y. Malik
Summary: The study focuses on optimizing entropy generation by using hybrid magnetized nanoparticles between two coaxially rotated porous disks. Numerical analysis and graph plotting show that increasing the volume fraction of hybrid nanoparticles can reduce entropy generation, while the Bejan number has an inverse relationship with entropy generation.
SURFACES AND INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Lingyun Zhang, Yupeng Hu, Minghai Li
Summary: The study reveals that Brownian motion, nanoparticle volume fraction, and porosity have significant impacts on the heat transfer rate, while nanoparticle diameter and radius ratio also influence the heat transfer rate.
Article
Engineering, Multidisciplinary
M. Sankar, H. A. Kumara Swamy, Qasem Al-Mdallal, Abderrahim Wakif
Summary: In the design of thermal devices, the challenge lies in minimizing entropy production while maximizing energy dissipation to enhance system efficiency. This study investigates the combined impacts of source-sink arrangements and annular inclination on buoyant nanoliquid motion, thermal dissipation, and irreversibility distribution in a tilted porous annulus. The findings show that the inclination angle and position of source-sink arrangement play a vital role in fluidity and flow patterns of nanoliquid, leading to higher thermal dissipation and minimum entropy production in thermally efficient systems. The shape of nanoparticles also affects thermal efficiency, with blade-shaped nanoparticles showing better performance. These findings have applications in solar systems, electronic equipment cooling, and heat exchangers.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Thermodynamics
Oktay Cicek, A. Filiz Baytas, A. Cihat Baytas
Summary: This study numerically analyzes the mixed convection and entropy generation in an annulus with a rotating heated inner cylinder for SWCNT-water nanofluid flow using the LTNE model. The findings indicate that buoyancy force and rotational effect significantly impact the strength of streamlines and isotherms. The addition of nanoparticles to the fluid decreases the minimum total entropy generation, suggesting a significant role for nanofluids in thermal design and heat transfer optimization.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2021)
Article
Energy & Fuels
Kashif Ali, Sohail Ahmad, Kottakkaran Sooppy Nisar, Aftab Ahmed Faridi, Muhammad Ashraf
Summary: Hybrid nanoliquids exhibit improved physical strength, mechanical resistance, thermal conductivity, and chemical stability compared to individual nanoliquids. The study found that hybrid nanofluids have the potential to significantly increase shear stress levels, up to 57% in some cases. Caution must be exercised in using these fluids, particularly in applications where control over shear stress is necessary.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Engineering, Aerospace
T. Rahim, J. Hasnain, N. Abid, Z. Abbas
Summary: The study focuses on numerically investigating entropy generation in the steady flow of viscous fluid and hybrid nanofluid in a vertical annulus with clear region and porous media. Different models and parameters were used to evaluate momentum and energy transport. The findings show that momentum and energy transport are more significant when two immiscible fluids or a hybrid nanofluid are used.
PROPULSION AND POWER RESEARCH
(2022)
Article
Energy & Fuels
Ali E. Anqi
Summary: This paper investigates the significance of a serpentine microchannel on the surface of batteries and confirms that the use of nanofluids can increase heat transfer between the microchannel and battery by up to 20%. The study also finds that the Reynolds number is the most effective parameter in improving heat transfer, with an increase from 6.34 to 12.75 when the Reynolds number varies from 25 to 150. Additionally, the use of hydrophobic walls in microchannels leads to a 14.4% enhancement in heat transfer compared to conventional walls.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
Md. Jahid Hasan, Arafat A. Bhuiyan
Summary: This research evaluates the thermal performance and entropy generation of a helical heat exchanger with different rib profiles and coil revolutions using water-based Al2O3 nanofluid. The study uses a steady-state computational fluid dynamic model and validates it with numerical and experimental studies. The results show that increasing the coil revolutions improves the overall heat transfer rate but also increases the entropy generation. The study provides guidance for selecting an efficient heat transfer design based on thermo-hydraulic performance.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Multidisciplinary Sciences
Navid Alipour, Bahram Jafari, Kh. Hosseinzadeh
Summary: To address the challenge of thermal performance and heat loss in energy conversion systems, this study simulated a trapezoidal cavity with a wavy top wall containing water/ethylene glycol GO-Al2O3 nanofluid using the Galerkin finite element method. The effects of physical parameters, such as porosity, thermal radiation, magnetic field angle, Rayleigh number, and Hartmann number, on thermal performance and fluid flow were investigated. The optimized values for these parameters were determined to be 1214.46, 2.86, 0.63, 0.24, and 59.35, respectively. By applying RSM and Taguchi integration, the highest average Nusselt number of 3.07 was achieved, indicating improved thermal performance.
SCIENTIFIC REPORTS
(2023)
Article
Physics, Multidisciplinary
Zehba A. S. Raizah, Ammar I. Alsabery, Abdelraheem M. Aly, Ishak Hashim
Summary: The study examined the flow and heat transfer fields of a nanofluid within a horizontal annulus partly saturated with a porous region using the Galerkin weighted residual finite element technique scheme. Factors such as Darcy number, porosity, and nanoparticle volume fractions were found to impact the streamlines, isotherms, and isentropic distribution. The study also revealed that the stream function value increases with the Darcy parameter and porosity but decreases with the growing porous region's area, while the Bejan number and average temperature decrease with an increase in Darcy number, porosity, and nanoparticle volume fractions.
Article
Engineering, Multidisciplinary
Amin Shahsavar, Mehdi Heidarian, Cagatay Yildiz, Muslum Arici
Summary: The thermal performance of a heat sink with open-ring pin fins (ORPF) cooled by biologically synthesized silver-water nanofluid is studied. The arrangement of ORPFs, namely in-line and staggered, is investigated. The effects of different nanoparticle volume fractions (phi=0-1%) and Reynolds numbers (Re=500-2000) on the thermal performance and entropy generation behavior are evaluated. Results show that the convective heat transfer coefficient is improved by up to 71% and 19.3% in in-line, and 65% and 24.7% in staggered ORPF configurations, respectively. The addition of nanoparticles and increase in Reynolds number enhance the thermal performance and reduce entropy generation rates.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2023)
Article
Computer Science, Interdisciplinary Applications
Zachariah Mbugua Mburu, Sabyasachi Mondal, Precious Sibanda
Summary: This study investigates the combined effects of thermal radiation, chemical reactions, and magnetic fields on entropy generation in unsteady nanofluid flow past an inclined cylinder using the Buongiomo model. The results show that entropy generation is significantly suppressed by thermal radiation and chemical reaction parameters but enhanced by the presence of a magnetic field, viscous dissipation, and the Reynolds number. Additionally, fluid flow variables are influenced by factors such as the thermophoresis parameter, cylinder inclination angle, and the Richardson number.
JOURNAL OF COMPUTATIONAL DESIGN AND ENGINEERING
(2021)
Article
Physics, Multidisciplinary
Zahir Shah, Asad Ullah, Awad Musa, Narcisa Vrinceanu, Santiago Ferrandiz Bou, Shahid Iqbal, Wejdan Deebani
Summary: The aim of this research is to study the performance of hybrid eclectically conducting nanofluid (MWCNT-Fe3O4) with entropy optimization impacts using the CVFEM approach. The simulation results show an inverse relation between permeability and the Bejan number, and an increase in boundary layer thickness with intensification in Lorentz force.
FRONTIERS IN PHYSICS
(2022)
Article
Thermodynamics
Recep Ekiciler, Kamil Arslan, Oguz Turgut
Summary: This study investigates the flow and heat transfer characteristics of ZnO/EG-H2O nanofluid in a parabolic trough solar collector, and explores the effects of different flow rates and nanoparticle volume fractions. Numerical simulations and experimental results show that the ZnO/EG-H2O nanofluid significantly improves the collector efficiency and usable energy. The Nusselt number is found to increase by about 100% compared to using EG-H2O as the working fluid, indicating enhanced thermal performance. These findings suggest that nanofluid could be a promising option for parabolic trough solar collectors.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Thermodynamics
Seyed Pooya Aghili Yegane, Alibakhsh Kasaeian
Summary: This study presents the thermal management of a flat plate solar collector using entropy generation analysis in the presence of porous metal foam and Al2O3-Cu/water hybrid nanofluid. The effects of key factors such as porous media, nanofluid volume fraction, and magnetic field on entropy generation were investigated. Results show that adding nanoparticles can reduce irreversibility under certain conditions of magnetic field strength and Reynolds number.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Hesam Moghadasi, Navid Malekian, Ehsan Aminian, Hamid Saffari
Summary: This paper investigates entropy generation analysis in pool boiling and the mechanisms of entropy generation through energy transfer via circular surfaces. Two models are developed to analyze the effect of different parameters on pool boiling heat transfer. The results show that increasing wall superheat temperature, contact angle, Prandtl number, and surface diameter enhances heat flux and entropy generation.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Hamed Shakeri, Hesam Moghadasi, Hamid Saffari
Summary: This paper investigates the improvement of the pool boiling process using electrodeposition and photolithography to create hierarchical patterns. The modified surfaces are characterized and the effect of various parameters on heat transfer is studied. The results show that changing the morphology of deposition and creating volcano-shape structures are more suitable for enhancing heat transfer.
EXPERIMENTAL HEAT TRANSFER
(2023)
Article
Engineering, Mechanical
Ehsan Vatanjoo, Ehsan Aminian, Mohammad Kamali, Hamid Saffari
Summary: This study discusses the effect of the maximum droplet radius on heat transfer characteristics of hybrid surfaces and investigates the impact of Marangoni convection caused by temperature gradients on heat transfer rate.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(2023)
Article
Construction & Building Technology
Saeid Chahardoli, Mehdi Khakzand, Mohsen Faizi, Majid Siavashi
Summary: This study numerically investigates the influence of building shape on improving outdoor air quality. The results confirm that the combination of shed roof and porch can reduce particle deposition on the downstream wall of the building, while using a porch at different heights integrated with a flat roof accumulates more particles on the downstream wall.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Water Resources
Milad Hosseini, Majid Siavashi, Milad Shirbani, Mohaddeseh Mousavi Nezhad
Summary: Simulation of flow at the pore scale is crucial for understanding fluid behavior in porous media. This study investigates the effect of the magic parameter on simulation results by considering errors in micro-CT images, and compares the results with the Navier-Stokes method. The study also presents a criterion for estimating the error amplitude of flow characteristics due to micro-CT imaging. The findings show that the magic parameter can accurately simulate complex geometries with minimal error.
ADVANCES IN WATER RESOURCES
(2023)
Article
Thermodynamics
Hamidreza Khoshtarash, Majid Siavashi, Milad Ramezanpour, Martin J. Blunt
Summary: By conducting pore-scale simulations, the flow characteristics and convective heat transfer of two-phase nanofluid flow in open-cell metal foams (OCMFs) were investigated. The results showed that parameters such as non-Michaelis flow patterns, nanoparticle concentration and diameter, and pore density have significant effects on heat transfer.
APPLIED THERMAL ENGINEERING
(2023)
Review
Energy & Fuels
Milad Shirbani, Majid Siavashi, Mehdi Bidabadi
Summary: Utilizing phase change materials (PCMs) is an effective method of storing thermal energy and gaining popularity in renewable energy systems. Various numerical methods have been used to study PCM performance during phase changes, but their low thermal conductivity limits their industrial applications. This article addresses the efficient methods of enhancing PCM thermal conductivity.
Article
Thermodynamics
Reza Paknahad, Majid Siavashi, Milad Hosseini
Summary: This study investigates pore-scale flow and conjugate heat transfer in high-porosity open-cell metal foams. Direct numerical simulations are performed using a lattice Boltzmann solver for flow and advection-diffusion. The results show that the transition from the Darcy to non-Darcy regime occurs at lower Reynolds numbers in foams with lower porosity. Additionally, metal foams cool down rapidly at high flow velocities while the temperature rise in the fluid is minimal.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Hamid Saffari, Mohammad Kamali, Ehsan Vatanjoo, Ehsan Aminian
Summary: This study compares the effects of three distinct hybrid surface models on heat transfer characteristics, indicating that shorter micropillar heights and an increase in solid fraction lead to higher heat fluxes.
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
(2023)
Article
Thermodynamics
Abbas Haji, Hesam Moghadasi, Hamid Saffari
Summary: The two-phase heat transfer, utilizing latent heat of vaporization, has found applications in various industries to remove surface heat and enhance surface performance. The hydrophilic and hydrophobic properties of each phase contribute to improved boiling process. Surfaces with mixed wettability (biphilic) can significantly influence bubble dynamics and boiling heat transfer.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Article
Energy & Fuels
Sepehr Mousavi, Amirhosein Zadehkabir, Majid Siavashi, Xiaohu Yang
Summary: This paper proposes a new hybrid cooling system that combines phase change material (PCM) and liquid cooling to achieve high performance and safety for prismatic batteries. The system uses mini-channel cold plates and PCM plates to provide parallel cooling. Three-dimensional numerical simulations and real driving cycle tests validate the thermal performance, power consumption, and safety of the system. The new design improves battery thermal management characteristics and reduces fabrication and maintenance costs.
Article
Thermodynamics
Amir Babaei, Ehsan Aminian, Hamid Saffari
Summary: This study conducts a 3D numerical research on the hydro-thermal performance of water-Al2O3/CuO nanofluids and water/Al2O3-CuO hybrid nanofluid in a U-bend tube with a porous medium featuring both hydrophilic and hydrophobic surfaces. The influence of Dean number on hydro-thermal performance is investigated, and the results show that Dn=600 exhibits the best performance. Moreover, a completely hydrophobic wall outperforms a completely hydrophilic one and other combinations of hydrophilicity and hydrophobicity. Additionally, the increase in Darcy number and the porous thickness ratio significantly impact heat transfer efficiency improvement.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY
(2023)
Article
Polymer Science
Hesam Moghadasi, Md Tusher Mollah, Deepak Marla, Hamid Saffari, Jon Spangenberg
Summary: DLP is a popular 3D printing method that uses vat photopolymerization, where liquid resin is solidified using UV light. This study presents computational fluid dynamics simulations to analyze the effects of process parameters on the stability time of the fluid interface in top-down DLP printing. The results show that higher viscosity leads to higher stability time, while higher travel speed ratio leads to lower stability times in the printed layers. Optimal process parameters are crucial for practical results, and the numerical model can assist in optimizing them.
Article
Thermodynamics
Hassan Talaei, Hamid-Reza Bahrami
Summary: This study explores how forced convective cooling can enhance heat transfer in electronic devices. The addition of porous baffles in different configurations improves hydrothermal performance in cooling channels, resulting in optimized energy dissipation and reduced degradation of the devices. The study demonstrates that baffle location and shape are crucial factors for achieving efficient convective heat transfer.
HEAT AND MASS TRANSFER
(2023)
Article
Energy & Fuels
Hamed Mir, Majid Siavashi
Summary: In this study, a whole-time scenario optimization is designed to simultaneously optimize the operational and well placement parameters of SAGD. Parallel particle swarm optimization is developed to reduce computational costs. The findings show that conducting parallel PSO can significantly reduce the optimization time, and using non-uniform time intervals can achieve the highest NPV and shorten the SAGD time.
GEOENERGY SCIENCE AND ENGINEERING
(2023)
