Article
Computer Science, Interdisciplinary Applications
Hanif Heidari, Rasul Mohebbi, Amir Kazemi
Summary: This paper numerically investigates the forced convection heat transfer of Ag-MgO/water hybrid micropolar nanofluid in a channel with a smooth top wall and a stairway-shaped bottom. The study shows that increasing the Reynolds number and solid volume fraction, while simultaneously decreasing the stairway aspect ratio, leads to an increase in the average Nusselt number.
INTERNATIONAL JOURNAL OF MODERN PHYSICS C
(2021)
Article
Thermodynamics
A. Alsabery, A. Hajjar, M. A. Sheremet, M. Ghalambaz, I Hashim
Summary: The analysis focuses on the computational study of nanosuspension forced convection in a horizontal wavy channel with heating from the upper wavy surface. The use of nanofluids and irregular channels can enhance energy transport and heat removal. Increasing Reynolds number leads to a narrowing of fluid tube within the channel and improvement of average velocity and Nusselt number, while higher channel waviness number results in increased average particle velocity and temperature.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Mechanics
S. Panday, J. M. Floryan
Summary: It is shown that streaks and rolls can be created in a controlled manner in fully developed shear layers using spatially distributed heating, with their spatial distribution dictated by the heating pattern. The method is applicable for any Reynolds number and heating intensity. The energy costs of streak formation in laminar flows have been determined.
Article
Thermodynamics
Naifa S. Alatawi, Abeer M. Almutairi, S. A. Khalil, Asma Obaidallah Alatawi, Wejdan Al-Anazi, Mourad Magherbi
Summary: This paper investigates heat transfer and entropy generation caused by mixed convection in an inclined channel with nanofluid jets for cooling photovoltaic panels. The numerical solution of the governing flow equations is obtained using COMSOL software. The effects of inclination angle, Reynolds number, and nanoparticle fraction on heat transfer and entropy generation are examined. The results show that the angle of inclination has a weak effect on heat transfer and thermal irreversibility, while the nanofluid concentration and Reynolds number have a significant impact. The increase in nanoparticle concentration leads to a 15% increase in Nusselt number and thermal irreversibility.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Sumit Kumar Mehta, Sukumar Pati, Shahid Ahmed, Prangan Bhattacharyya, Jishnu Jyoti Bordoloi
Summary: This study aims to analyze the thermal, hydraulic and entropy generation characteristics for laminar flow through a ribbed-wavy channel with different rib geometries. The findings show that the average Nusselt number is higher for ribbed-wavy channels compared to parallel plate channels beyond a critical Reynolds number. Additionally, the performance factor sharply decreases with Reynolds number up to a certain point before either gradually decreasing or increasing, depending on the rib shape and number.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2022)
Article
Thermodynamics
Debayan Bhowmick, Pitambar R. Randive, Sukumar Pati
Summary: The study indicates that introducing a corrugated wall in a partially filled porous channel can enhance the mixing capability between hot and cold fluids, leading to an increase in heat transfer rate. Among the sinusoidal, triangular, and trapezoidal corrugated channels, the trapezoidal one shows better heat transfer enhancement. The performance factor is strongly dependent on both the Reynolds number and the profile of the corrugated channel.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Nuraini Binti Sukhor, Alhassan Salami Tijani, Jeeventh Kubenthiran, Ibrahim Kolawole Muritala
Summary: The use of emerging technology in the electronic industry has led to the miniaturization of electronic devices, making heat dissipation crucial for maintaining high performance and reliability. This study systematically modeled and investigated the computational heat transfer characteristics of Al2O3-Cu/water hybrid nanofluid in a micro heat sink, finding that Nusselt number increases with Reynolds number and smaller transverse pitch leads to better heat transfer performance.
INTERNATIONAL JOURNAL OF GREEN ENERGY
(2021)
Article
Multidisciplinary Sciences
Mohamed Bechir Ben Hamida, Mohammad Hatami
Summary: In this study, a finned micro-channel design for LED cooling was optimized using a nanofluid and geometry variables to enhance heat transfer efficiency. The results showed that the length of the fin had the most significant impact on the Nusselt number, with Al2O3 nanoparticles at phi=0.05 providing the greatest heat transfer value. Different fin arrangements increased nanofluid temperature by up to 6.5%, improving the LED cooling process.
SCIENTIFIC REPORTS
(2021)
Article
Thermodynamics
Sara Armou, Mustapha Ait Hssain, Soufiane Nouari, Rachid Mir, Kaoutar Zine-Dine
Summary: The study investigates the impact of varying baffle height and spacing distance on heat transfer and cooling performance of electronic components in a baffled horizontal channel using a Cu-H2O nanofluid under mixed convection and laminar flow. The results show that increasing the baffle height and reducing the distance between the baffle and the electronic components can improve heat transfer. The optimal baffle height is found to be no lower than 0.6, and the recommended distance between the heaters and the baffle is 0.5.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2023)
Article
Thermodynamics
Muhammad Ibrahim, Tareq Saeed, Ebrahem A. Algehyne, Abdallah S. Berrouk, Yu-Ming Chu
Summary: This numerical investigation compares the hydrothermal characteristics of free, mixed, and forced convection of water-copper nanofluid in a cavity using different methods. The study shows that the presence of nanoparticles, as well as various parameters such as phi, Ra, Ri, and Re, significantly affect the average Nusselt number of the nanofluid. Additionally, the artificial neural network (ANN) modeling reveals the different impacts of nanoparticle concentration on free and forced convection modes.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Computer Science, Interdisciplinary Applications
Jiaqi Zhao, Ming Zhang, Yu Zhu, Rong Cheng, Leijie Wang
Summary: This study introduces a novel three-layer thermofluid model for topology optimization of planar cooling channels. By introducing the porosity field to describe the channel's topology, optimized channels show competitive heat dissipation performance.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2021)
Article
Multidisciplinary Sciences
Meisam Babanezhad, Iman Behroyan, Ali Taghvaie Nakhjiri, Azam Marjani, Saeed Shirazian
Summary: The study aims to demonstrate the performance of artificial intelligence (AI) algorithm as a supplementary method to collaborate with Computational Fluid Dynamics (CFD). By considering the turbulent flow of Cu/water nanofluid heating in a pipe, the AI algorithm learned CFD results and identified the relationship between them. The adaptive network-based fuzzy inference system (ANFIS) was found to accurately predict nanofluid pressure, surpassing the time efficiency of CFD simulation.
SCIENTIFIC REPORTS
(2021)
Article
Mathematics, Applied
H. Sajjadi, M. Atashafrooz, A. Amiri Delouei, Y. Wang
Summary: This study utilized the DMRT-LBM method to investigate particle motion in a modeled room under different heating system locations. Results showed that the maximum heat transfer rate is achieved when the heating system is placed in the middle of the wall, regardless of the Rayleigh numbers. For 1 μm particles, no deposition was observed on the walls for all heating system locations at Ra = 10^4, indicating maximum suspension of particles, while for both Rayleigh numbers and 10 μm particles, maximum deposition occurred when the heating system was positioned at the top of the wall.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2021)
Article
Engineering, Multidisciplinary
Rachid Maouedj, Younes Menni, Mustafa Inc, Yu-Ming Chu, Houari Ameur, Giulio Lorenzini
Summary: The aim of the study is to improve the efficiency of channel heat exchangers by changing their internal geometry and using Oil/MWCNT nanofluid. The computational results show that increasing the Oil/MWCNT rates in the presence of VGs generates negative turbulent velocities, promoting the agitation of nanofluid particles and enhancing heat transfer rates within the CHE.
CMES-COMPUTER MODELING IN ENGINEERING & SCIENCES
(2021)
Article
Thermodynamics
Jun Gil Song, Jong Hui Lee, Il Seouk Park
Summary: This study proposed a novel heat-pipe-embedded heat sink to address the thermal conductivity issue in high specification electronic equipment used in naval combat systems. Experimental results showed that the new heat sink successfully reduced the maximum temperature of the heat source, leading to space, weight, cost, and energy savings in the combat management system.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Yuan Ma, Mohammad Mehdi Rashidi, Rasul Mohebbi, Zhigang Yang
Summary: This study numerically investigates the natural convection heat transfer of hybrid nanofluid (Ag-TiO2/water) in a complex cavity named Shamse knot shape, considering the effects of magnetic field, Rayleigh number, nanoparticle volume fraction, and hollow side length. The results show that the magnetic field has a negative impact on thermal performance, while the nanoparticle volume fraction significantly influences heat transfer efficiency. This research provides insights into the fluid flow and heat transfer characteristics influenced by various parameters in a complex cavity configuration.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2021)
Article
Computer Science, Interdisciplinary Applications
Rasul Mohebbi, Mohsen Babamir, Mohammad Mahdi Amooei, Yuan Ma
Summary: This paper investigates the natural convection of Ag-MgO/water micropolar hybrid nanofluid in a hollow hot square enclosure with four cold obstacles. The study uses the lattice Boltzmann method (LBM) to simulate the fluid flow and heat transfer performance under different Rayleigh numbers and nanoparticle volume fractions. The results show that the presence of secondary vortices is influenced by the aspect ratio, and the average Nusselt number increases with higher Rayleigh numbers, nanoparticle volume fractions, cold obstacle heights, and aspect ratios.
INTERNATIONAL JOURNAL OF MODERN PHYSICS C
(2022)
Article
Thermodynamics
Yuan Ma, Rasul Mohebbi, Zhigang Yang, Mikhail Sheremet
Summary: This research numerically analyzes the nanofluid natural convection inside a square enclosure with two L-shaped heaters using the lattice Boltzmann method. The study finds that the CGNP/water nanofluid is an efficient coolant and the Nusselt number increases with nanoparticle concentration and Rayleigh numbers. The flow pattern inside the enclosure is not affected by nanoparticle concentration, but is significantly influenced by Rayleigh number and heaters configuration.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2022)
Article
Physics, Multidisciplinary
Yuan Ma, Rasul Mohebbi
Summary: This study investigates natural convection of nanofluid inside a 2D cavity with different types of cold walls using Buongiorno's two-phase model. The equations are solved using a homemade hybrid Lattice Boltzmann-Finite Difference (LBM-FD) code. It is found that although the nanoparticle concentration is nearly uniform inside the cavity, there are apparent differences around the walls and vortices. The nanoparticles tend to have higher concentrations near the cold wall and lower concentrations adjacent to the hot wall. Additionally, the configuration of the cold walls significantly affects the flow pattern and temperature distribution.
WAVES IN RANDOM AND COMPLEX MEDIA
(2022)
Article
Thermodynamics
Peyman Soleymani, Yuan Ma, Ehsan Saffarifard, Rasul Mohebbi, Meisam Babaie, Nader Karimi, Seyfolah Saedodin
Summary: This paper numerically investigates the forced convection and entropy generation of Fe3O4 water nanofluid inside a cylindrical tube with porous hemisphere media. The effects of different parameters such as Reynolds number, porosity, solid volume fraction of nanofluid, friction factor, and entropy generation are discussed and analyzed. The results show that as the Reynolds number increases, the effect of inertial forces becomes more dominant, adding nanoparticles is more effective in enhancing heat transfer than increasing Hartmann's number, adding a magnetic field increases the friction factor, and adding nanoparticles reduces entropy generation.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Engineering, Multidisciplinary
Yuan Ma, Rasul Mohebbi, Mikhail Sheremet
Summary: This study investigates the liquid motion and energy transfer structures around a starfish-inspired cylinder by numerical simulations. The results show that the circulation patterns and energy transport characteristics are influenced by the tuber length, angle of attack, and Reynolds number.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2023)
Article
Computer Science, Interdisciplinary Applications
Rasul Mohebbi, Yuan Ma, Mohamad Hosein Shakeri
Summary: This study investigates the flow pattern and heat transfer characteristics inside an Islamic knot-shaped cavity using numerical simulation. The height and length of the obstacle are varied to analyze their effects. The results reveal that changes in the obstacle's dimensions significantly impact the flow and temperature fields. The small gap inside the cavity has minimal influence on the flow motion, while a small gap between the cold and hot surfaces enhances conduction heat transport. Two distinct flow and heat transfer situations are observed depending on the obstacle dimensions and Reynolds number. The second situation exhibits superior heat transfer performance, especially at higher Reynolds numbers.
INTERNATIONAL JOURNAL OF MODERN PHYSICS C
(2023)
Article
Environmental Sciences
Amin Amiri Delouei, Hasan Sajjadi, Goodarz Ahmadi
Summary: This study introduces ultrasonic vibration technology as an active method to enhance the thermal performance of water-cooling systems. Experimental results show that the thermal performance of ultrasonic vibrations can be improved by reducing the airflow rate and increasing the ultrasonic power. In addition to heat transfer improvement, ultrasonic waves are widely used for cleaning heat exchangers. This technology could provide a practical way for developing high-performance nanofluids-based computer cooling systems.
Article
Ecology
Amin Amiri Delouei, Hasan Sajjadi, Meysam Atashafrooz, Mohammad Hesari, Mohamed Bechir Ben Hamida, Ahmad Arabkoohsar
Summary: Utilizing ultrasonic excitation as an active method, this study experimentally investigated the effects of ultrasonic excitation on the heat transfer rate in a fin-and-flat tube heat exchanger. A comprehensive parameter study was conducted, and the results showed that reducing the flow rate, ambient temperature, and air passing velocity increased the effects of ultrasonic excitation. The highest heat transfer enhancement was 70.11%, measured at the lowest air passing velocity and ambient temperature with a Reynolds number 2166.
Article
Engineering, Mechanical
H. R. Davarzani, A. Ganjali, H. Sadeghi, R. Mohebbi
Summary: Storage tanks in refinery plants are arranged in group formations and wind is treated as a critical lateral load. This study investigates the impact of tank adjacency on wind pressure fluctuations. Wind tunnel tests were conducted for corrugated-plate tanks of varying rise-to-span ratios, and compared to numerical calculations using computational fluid dynamics. The adjacency effect of tanks in transverse and longitudinal directions were evaluated, and compared to non-adjacency scenarios. Results showed that the adjacency effect was below 10% at distances three and four times the diameter, respectively. Corrugated-plate tanks had smaller negative pressure coefficients compared to simple-plate tanks.
EXPERIMENTAL TECHNIQUES
(2023)
Article
Thermodynamics
Rasul Mohebbi, Yuan Ma
Summary: This research investigates the flow and heat transfer characteristics past three hot obstacles in a sudden expansion and contraction channel. The use of MWCNT-Fe3O4 Water hybrid nanofluid is employed to enhance heat transfer. The study explores the effects of Reynolds number, nanoparticle volume fraction, and different arrangements of discrete heat sources on flow pattern, temperature distribution, and heat transfer. Simulation is conducted using the lattice Boltzmann method.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Thermodynamics
Molka El Maghraoui, Rasul Mohebbi, Mikhail Sheremet, Majdi Hazami
Summary: In this study, the simulation of laminar mixed convection heat transfer in a 2-D inclined channel with conductive fins was conducted using the lattice Boltzmann method (LBM). The effects of inclination angle, geometrical parameters, and Richardson numbers on heat transfer and flow structure were investigated. The numerical model was validated by benchmark problems, and the results were analyzed in terms of isotherms, streamlines, average Nusselt number, and average temperature. The findings showed that the number, height, and width of fins had an impact on the heat transfer rate, and the Richardson number and inclination angle enhanced the average Nusselt number.
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
(2023)
Article
Environmental Sciences
Pedram Rezaei, Hamid Reza Moheghi, Amin Amiri Delouei
Summary: This paper focuses on the fabrication and optimization of a spiral-tube heat exchanger (STHE) to improve the heat transfer rate and efficiency of traditional instantaneous water heaters. The large number of exported instantaneous water heaters from Garman Gas Toos company has caused significant cost and credit reduction due to corrosion and leakage. The high energy consumption also justifies the need for a new STHE design. The main innovation of this research is the development of a smaller and more efficient heat exchanger by identifying the factors that affect its efficiency and heat transfer rate.
