Article
Mathematics, Applied
N. A. Zainal, R. Nazar, K. Naganthran, I Pop
Summary: The unsteady mixed convection of the Al2O3-Cu/H2O hybrid nanofluid flow near the stagnation point past a vertical plate is analyzed. The effects of the volume fraction of nanoparticles, the unsteadiness parameter, and the slip parameter on heat transfer rate are studied numerically. It is found that the heat transfer rate decreases with the increase of volume fraction of nanoparticles, and the unsteadiness parameter and slip parameter have opposite effects.
APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION
(2022)
Article
Computer Science, Artificial Intelligence
Nur Syahirah Wahid, Norihan Md Arifin, Najiyah Safwa Khashi'ie, Ioan Pop, Norfifah Bachok, Mohd Ezad Hafidz Hafidzuddin
Summary: A new kind of heat transfer fluid called hybrid nanofluid was introduced to enhance heat exchanger performance. Numerical investigation revealed that adding copper volume concentration can improve heat transfer and prevent laminar-to-turbulent transition.
NEURAL COMPUTING & APPLICATIONS
(2022)
Article
Thermodynamics
Soufiane Nouari, Elhafad Bara, Zakaria Lafdaili, Sakina EL-Hamdani, Abdelaziz Bendou, Hicham Doghmi
Summary: In this study, the impact of oscillatory movement on heat transfer within a double periodic lid-driven cubic enclosure filled with copper-water nanofluid was investigated. It was found that decreasing the Richardson number with low lids frequency can greatly enhance heat transfer. Swapping from Case 2 to Case 1 leads to a 29.74% increase in the maximum average Nusselt number. At a high Richardson number, using high lids frequency increases heat transfer rate compared to using low lids frequency (an enhancement of 4.32% for Case 1 and 3.63% for Case 2). The best heat transfer rate was achieved for Case 1 when the lids move positively, transporting the cold flow to the hot side. Increasing the concentration of nanoparticles improves heat transfer. This study contributes to understanding the problem of mixed convection in a cubic enclosure with oscillatory walls.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2022)
Article
Physics, Multidisciplinary
Nur Syahirah Wahid, Norihan Md Arifin, Najiyah Safwa Khashi'ie, Ioan Pop, Norfifah Bachok, Mohd Ezad Hafidz Hafidzuddin
Summary: Nanofluid, a novel heat transfer fluid, shows potential for enhancing heat transfer efficiency. This study numerically investigates the flow and heat transfer of a mixed convective hybrid nanofluid along a vertical plate. The findings reveal the existence of dual solutions and suggest minimizing the nanofluid concentration and maximizing thermal radiation for better heat transfer performance.
CHINESE JOURNAL OF PHYSICS
(2022)
Article
Mathematics
Nurul Amira Zainal, Roslinda Nazar, Kohilavani Naganthran, Ioan Pop
Summary: This study conducted a numerical analysis on the unsteady magnetohydrodynamic mixed convection at a three-dimensional stagnation point flow, revealing that the enhancement of suction/injection and magnetic parameters exaggerates heat transfer rate and skin friction coefficient, while the increase in volume fraction of nanoparticles and decrease in unsteadiness parameter lead to a decrease in performance.
Article
Multidisciplinary Sciences
Imran Siddique, Muhammad Nadeem, Jan Awrejcewicz, Witold Pawlowski
Summary: This study investigates the unsteady energy and mass transport of magnetohydrodynamics (MHD) second grade nanofluid via an exponentially extending surface with Dufour and Soret effects. Variable thermal conductivity and mixed convection effects are used to study the heat transfer mechanism. The results show that the fluid with variable thermal conductivity exhibits significantly different and realistic characteristics.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Multidisciplinary
Masoud Fatholahi, Amirmasoud Anvari, Omid Ali Akbari, Farnaz Montazerifar, Hamidreza Ghaedamini, Davood Toghraie, Sina Nouraei
Summary: The results of the study show that the thermal boundary layer is unavoidable due to heat exchange between hot and cold sources, and it is significantly reduced with increasing Reynolds number.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Multidisciplinary Sciences
Zubair Mustafa, T. Javed, T. Hayat, A. Alsaedi
Summary: This article investigates the unsteady flow of nanofluid over a cone considering the effects of MHD and mixed convection. The study also takes into account variable viscosity and viscous dissipation. The Homotopy Analysis Method (HAM) is used to solve the resulting system of equations. Numerical tables and graphs are utilized to examine the influence of different variables on the skin friction coefficient, as well as the heat and mass flux. It is found that the surface drag force in the x and y directions increases with the buoyancy force parameter, while the tangential and azimuthal velocity decrease with the variable viscosity parameter. Moreover, the fluid temperature decreases with the unsteady parameter but increases with the Eckert number.
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
Mathematics
Rusya Iryanti Yahaya, Norihan Md Arifin, Ioan Pop, Fadzilah Md Ali, Siti Suzilliana Putri Mohamed Isa
Summary: This study presents a mathematical model for the unsteady, two-dimensional mixed convection stagnation point flow over a Riga plate. The model incorporates convective boundary conditions, time-dependent derivatives, mixed convection, radiation effects, and the Grinberg term. By using similarity transformations, ordinary differential equations (ODEs) are derived from the partial differential equations (PDEs) of the flow model. The numerical results suggest that increasing the modified Hartmann number, mixed convection parameter, and unsteadiness parameter can enhance the heat transfer performance in this flow model. This study provides valuable insight into fundamental transport phenomena and offers valuable information on controlling the boundary layer flow pattern gradients.
Article
Multidisciplinary Sciences
Madiha Bibi, A. Zeeshan, M. Y. Malik
Summary: This paper examines the impact of MHD and viscous dissipation with joule heating on the convective stretching flow of dusty tangent hyperbolic fluid in 3D. The findings suggest that various parameters such as the power law index, magnetic field strength, Weissenberg effect, dust particle concentration, and unsteadiness parameter can influence the flow of fluid and solid granules.
SCIENTIFIC REPORTS
(2022)
Article
Engineering, Multidisciplinary
Rumman Hossain, A. K. Azad, Md Jahid Hasan, M. M. Rahman
Summary: This study conducted a numerical analysis of thermal radiation in a square enclosure with a semicircular heater and a sliding lid. The results showed that increasing radiation intensity and dimensionless time improves fluid velocity, pressure gradient, and temperature gradient, but decreases the heat transfer rate of the semicircular heater.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Multidisciplinary Sciences
Muhammad Bilal, Hamna Arshad, Muhammad Ramzan, Zahir Shah, Poom Kumam
Summary: This research focuses on investigating the thermal performance and temperature distribution of a hybrid nanofluid in a horizontal channel through numerical simulations and experiments. The results demonstrate that the hybrid nanofluid exhibits a more significant thermal enhancement compared to a simple nanofluid, with single-wall nanotubes having a greater impact on temperature.
SCIENTIFIC REPORTS
(2021)
Article
Thermodynamics
J. Tibaut, T. Tibaut, J. Ravnik
Summary: This paper presents a numerical study of laminar mixed convection of a nanofluid in a pipe and compares the results with experimental measurements. The research found that the distribution of nanoparticle concentration has a significant impact on the temperature field in both the fluid and the pipe.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Chemistry, Multidisciplinary
Xiangcheng You, Shiyuan Li
Summary: This study investigates the convective heat transfer of a hybrid nanofluid in an inclined channel through analytical methods. The results show that nanoparticle volume fractions play a key role in delaying the occurrence of flow reversal, with hybrid nanofluids having a longer delayed range compared to conventional nanofluids.
Article
Engineering, Mechanical
Rico H. T. Hooijschuur, Niranjan Saikumar, S. Hassan HosseinNia, Ron A. J. van Ostayen
Summary: This paper presents the development and dynamic evaluation of a contactless sensing system for an air-bearing based precision wafer positioning system. The system utilizes a thin film of air to float the substrate and avoid damage and contamination. A cascaded control design is implemented to optimize the performance and handle vibration disturbances. The contactless sensor is analyzed for its performance.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Kh. Hosseinzadeh, M. A. Erfani Moghaddam, SeyedKeivan Nateghi, Mohammad Behshad Shafii, D. D. Ganji
Summary: This study aimed to maximize thermal performance by simulating a curved porous star-shaped enclosure with a rounded cavity. The temperature difference between the inner cavity and outer surface stirred the heat flux. By investigating factors such as porosity, radiation intensity, magnetic field, and natural convection, optimal values were determined.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Chemistry, Physical
M. Habibnia, M. Sheikholeslami, S. M. Tabarhoseini, Ali Taheri, M. Sheykhi
Summary: This study focuses on the evaluation of cutting fluids in the turning process. The results show that employing nanofluid minimum quantity lubrication strategy can lead to an average temperature reduction of about 60% in the cutting tool during Mo40 steel turning. Furthermore, increasing the concentration of the nanofluid can further decrease the temperature.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Thermodynamics
Mehdi Asgari, Mohammad Javidan, Mosayeb Gholinia Hassankolaei, Mohammad Nozari, Aliasghar Asgari, Davood Domiri Ganji
Summary: This article investigates the use of cross-shaped fins and different forms and volume fractions of Copper(II) oxide nanoparticles to improve the thermal efficiency of paraffin phase change materials (PCMs). Increasing the volume ratio of nanoparticles and shape coefficient can shorten the solidification time, while increasing the length of cross-shaped fins enhances the solidification rate and heat transfer. It was found that when the inner and outer walls are involved in the solidification process simultaneously, the solidification rate increases by more than 66%.
Article
Thermodynamics
S. S. Ghadikolaei, Soheil Siahchehrehghadikolaei, M. Gholinia, Masoud Rahimi
Summary: This numerical study investigates the laminar flow and heat transfer of a single-phase covalently functionalized graphene nanoplatelets (CGNPs)/H2O green nanofluid in a liquid block heat sink with novel fin designs and nature-based algorithms. The study analyzes the influence of Reynolds number, nanoparticle volume fraction, and baseplate designs on CPU temperature, pumping power, heat transfer coefficient, and thermal efficiency. The spider netted baseplate design proves to be the most effective in lowering temperature, while the concentration of nanofluid and Reynolds number directly affect the heat transfer coefficient. The improvement of thermal output is highest when using the spider netted baseplate design and CGNPs 0.075%wt/H2O green nanofluid flow.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Article
Energy & Fuels
Hossein Nabi, Mosayeb Gholinia, Mehdi Khiadani, Abdellah Shafieian
Summary: This paper investigates the impact of red wine-rGO/H2O nanofluid and paraffin wax on the thermohydraulic properties of a photovoltaic/thermal system. Numerical simulations demonstrate that innovative serpentine tube designs significantly enhance the system's performance. The use of environmentally friendly materials such as red wine-rGO/H2O nanofluid and paraffin wax further improves the electrical and thermal efficiency of the system.
Article
Chemistry, Physical
Mehdi Safari, Amir Hossein Rabiee, Jalal Joudaki
Summary: The laser tube bending process (LTBP) is an effective manufacturing method that eliminates the need for bending dies and enables more accurate and economical tube bending. This study predicts the main bending angle and lateral bending angle in LTBP using support vector regression (SVR) modeling, with input data derived from experimental tests. The SVR models achieved high accuracy in predicting the bending angles, indicating the potential for applying SVR in LTBP.
Article
Multidisciplinary Sciences
Z. Khalili, M. Sheikholeslami, Ladan Momayez
Summary: In this study, a combination of thermoelectric generator (TEG) layer with conventional layers of photovoltaic-thermal (PVT) modules is used to utilize waste heat and improve efficiency. A cooling duct is installed at the bottom of the PVT-TEG unit to reduce the cell temperature. The type of fluid and structure of the duct affect the system performance. Hybrid nanofluid and three different duct configurations are implemented, and simulations show that the elliptic structure performs the best with a 6.29% enhancement in overall performance.
SCIENTIFIC REPORTS
(2023)
Article
Multidisciplinary Sciences
M. Jafaryar, M. Sheikholeslami
Summary: In this paper, the application of new structure and loading Graphene nanoparticles to enhance thermal storage systems has been studied. Aluminum layers were used in the paraffin zone, which has a melting temperature of 319.55 K. The paraffin zone was located in the middle section of a triplex tube, with uniform hot temperatures (335 K) applied to both walls of the annulus. Three container geometries were tested by changing the angle of fins (alpha = 7.5 degrees, 15 degrees, and 30 degrees). A homogeneous model with uniform concentration of additives was assumed for property prediction. The results show that loading Graphene nanoparticles decreases the melting time by about 4.98% when alpha = 7.5 degrees, and the impact of phi improves by about 5.2% when the angle is reduced from 30 degrees to 7.5 degrees. Furthermore, as the angle decreases, the melting period decreases by approximately 76.47%, which is associated with an increase in driving force (conduction) in geometries with lower alpha.
SCIENTIFIC REPORTS
(2023)
Article
Thermodynamics
As'ad Alizadeh, Fateme Sabet Sarvestani, Hussein Zekri, Mohsin O. AL-Khafaji, Hayder Mahmood Salman, Davood Domiri Ganji, Pooya Pasha
Summary: A scientific definition for laminar boundary layer flow and heat transfer of an incompressible viscous flow over a stretching cylinder near the suction/injection area is provided in this study. The study uses numerical and analytical methods to convert the differential equations into dimensionless coupled equations. The analysis shows that the suction process increases surface firmness and quality, while the injection process decreases surface skin friction. The use of water fluid accelerates the heat transfer process from the surface to the outside of the boundary layer.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Bahram Jalili, Amirhossein Rezaeian, Payam Jalili, Fathollah Ommi, Davood Domiri Ganji
Summary: This study evaluates the heat transfer phenomena of a nanofluid stream through a microchannel heat sink under the influence of a magnetic field. Aluminum oxide-water nanofluid is used as the cooling fluid, and the Koo-Kleinstreuer model is applied to calculate the viscosity and thermal conductivity of the nanofluid. The porous medium is modeled using the improved Darcy relationship, and the dispersion type of the two-equation approach is used to simulate heat transfer between the solid and fluid zones. The results indicate that the magnetic field has a direct impact on the Nusselt number, and heat transfer increases with the concentration of the nanofluid, with the highest heat transfer achieved at a concentration of 0.04.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Bahram Jalili, Hassan Roshani, Payam Jalili, Mohammad Jalili, Pooya Pasha, Davood Domiri Ganji
Summary: This paper investigates the behavior of a 2D steady, laminar, and incompressible viscous fluid between two porous disks under an external magnetic field. The study is divided into two interconnected parts. In the first part, the dimensionless equations of the nanofluid flow between the disks are analyzed using the Akbari-Ganji Method (AGM) and compared with numerical results. The second part focuses on using the Finite Element Method (FEM) in CFD software to study the fluid parameters of two different types of nanotubes.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Mehran Ghasemian, M. Sheikholeslami, Maziar Dehghan
Summary: This study applies numerical techniques to assess the integration of twisted tapes in different cross-sectional tubes of Photovoltaic/Thermal (PV/T) collector units, and the impact on system performance. Computational fluid dynamics is used to evaluate PV/T systems with cylindrical, rectangular, and triangular cross-sectional tubes, with and without twisted tapes. Various pitch-to-width ratios (YD) of twisted tapes and total inlet mass flow rates are considered. The analysis of energy and exergy is carried out to evaluate system performance. The results show that the triangular cross-sectional tube is optimal without twisted tapes, but the cylindrical tube with twisted tapes outperforms other designs in terms of electrical and thermal aspects. The addition of a twisted tape in the cylindrical tube increases electrical efficiency by 7.2% and 9%, respectively. Furthermore, integrating twisted tapes with the lowest pitch-to-width ratio reduces surface temperature by 3.2℃ and 17.55℃ compared to systems with cylindrical tubes and PV alone.
Article
Construction & Building Technology
M. Sheikholeslami, Z. Khalili
Summary: A new configuration of photovoltaic-thermal unit with a thermoelectric layer has been proposed to enhance electrical performance. The system includes a circular duct with a turbulator and a mini channel with jet impingement for hybrid nanofluid flow. By selecting the turbulator with the highest revolution, the electrical efficiency improves by about 1.41% and useful heat increases by about 5.72%. The best case equipped with confined jets achieves an electrical performance of 15.50% and a thermal performance of 85.30%, with a temperature uniformity improvement of about 46.89%.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
M. Sheikholeslami, Hazim R. A. Al-Hussein
Summary: This study combines Trombe wall with paraffin layer and fins for solar energy saving and ventilation purposes. Alumina nanoparticles are loaded into pure paraffin to enhance the performance. Two heat generation terms are added to consider solar irradiation, and temperature equations with heat sources are applied for modeling different layers. The impacts of fins' thickness, length, and paraffin layer's position are investigated. The system with Y-shaped fins shows higher liquid fraction and lower heat loss, leading to a 28.41% increase in heat capacity at 17:00 with the best configuration.
JOURNAL OF BUILDING ENGINEERING
(2023)
