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
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
Mechanics
Pierre Ricco, Claudia Alvarenga
Summary: The study investigates the development and growth of unsteady three-dimensional vortical disturbances in the entry region of a circular pipe using asymptotic and numerical methods. The disturbances initially manifest within the base-flow boundary layer with streamwise-elongated vortical structures, extending to occupy the entire pipe downstream. Increasing Reynolds number and decreasing frequency intensify the disturbances, while small azimuthal wavelengths and radial characteristic length scales amplify viscous dissipation. The transient growth and subsequent viscous decay mainly occur in the entrance region of the pipe.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Thermodynamics
Do Huu-Quan, Ali Mohammad Rostami, Mozafar Shokri Rad, Mohsen Izadi, Ahmad Hajjar, Qingang Xiong
Summary: This study focused on the convective heat transfer characteristics inside novel double-pipe heat exchangers with flat inner pipes, and found that the effects of inner pipe geometry heavily depend on the Reynolds number. Using flat inner pipes with small aspect ratio is beneficial for overall heat transfer at low Reynolds numbers, while circular inner pipes outperform at high Reynolds numbers.
APPLIED THERMAL ENGINEERING
(2021)
Article
Engineering, Multidisciplinary
Farida Iachachene, Zoubida Haddad, Muesluem Arici, Mehdi Jamei, Amina Mataoui
Summary: Turbulent forced convective flow of hybrid and single nanofluids in a conical diffuser is numerically investigated. The impact of using theoretical and experimental correlations for dynamic viscosity and thermal conductivity on the heat transfer is studied. Addition of TiO2 nanoparticles decreases the heat transfer inside the diffuser, whereas addition of TiO2-SiO2 nanoparticles either enhances or decreases the heat transfer rate. The Gene Expression Programming model accurately evaluates the relationship between the Nusselt number, Reynolds number, and nanoparticle concentration.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2023)
Article
Engineering, Mechanical
Richard J. Gross, Nicholas G. Garafolo, Garrett R. McHugh
Summary: This paper develops equations for velocity, pressure drop, and wall shear stress in the entrance or development region of a cylindrical pipe, and presents two mathematical models for F(x) and G(x) for different data scenarios.
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
(2021)
Article
Multidisciplinary Sciences
Abid. A. Memon, M. Asif Memon, Amsalu Fenta
Summary: This article investigates the fluid flow and heat transfer characteristics of a nanofluid in both deep and shallow cavities. The study utilizes the Corcione model to consider various factors such as viscosity, conductivity, nanoparticle size, temperature, and Reynolds number. The simulation is conducted using the Navier-Stokes and energy equations in two dimensions, along with COMSOL 5.6 software. The results show that the temperature distribution in the cavity is circular, with the average temperature decreasing as the volume fraction of copper increases. However, both the Reynolds number and copper volume fraction enhance the average Nusselt number, indicating improved heat transfer along the cavity's middle line. The percentage change in the average Nusselt number decreases with increasing aspect ratio, indicating better conduction.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Mechanical
Basma Baioumy, Rachid Chebbi, Nabil Abdel Jabbar
Summary: Using a momentum integral model, researchers investigated laminar Bingham fluid flow in the entrance region of a circular pipe, with the model converging to fully developed solution in the filled region and providing velocity, pressure drop, and skin friction coefficient profiles, in good agreement with experimental data.
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
(2021)
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
Mechanics
Jingzhe Xie, Gongnan Xie
Summary: This paper systematically investigates the vortex dynamics of supercritical carbon dioxide in both steady and laminar vortex shedding regimes. By comparing with conventional air, it is found that SCO2 exhibits accelerated vortex shedding processes and a higher Strouhal frequency. The transition from steady separated flow to primary wake instability for SCO2 is identified between Re of 28 and 29, indicating a lower critical Reynolds number than the classical value.
Article
Thermodynamics
Bahram Jalili, Narges Aghaee, Payam Jalili, Davood Domiri Ganji
Summary: This study investigates the convection heat transfer in a countercurrent double-tube heat exchanger with various fins, comparing the performance with simple and rectangular-finned geometries. The results show that the water-aluminum oxide nanofluid has a better convection heat transfer coefficient than water-titanium dioxide and pure water. Heat exchangers with rectangular and curved fins have significantly better efficiency than the heat exchanger without a fin.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Joshua Bopp, Daniel A. Weiss
Summary: This study investigates the cause of the overshoot phenomenon on the axial centerline velocity and the wall shear stress undershoot in the entrance region of turbulent pipe flows through numerical simulations. It is found that the overshoot is directly linked to the turbulent boundary layer and the high anisotropy state near the wall leads to small scale eddies creating radial velocity towards the wall, which contributes to the velocity overshoot and wall shear stress undershoot. Ultimately, the flow reaches an isotropy state far down the pipe as it fully develops and the radial velocity vanishes.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
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
Multidisciplinary Sciences
Meisam Babanezhad, Iman Behroyan, Azam Marjani, Saeed Shirazian
Summary: The potential of utilizing artificial intelligence algorithms in combination with computational fluid dynamics for simulating complex fluid mechanics problems has been shown, but further development of sophisticated algorithms is needed. Studies on the efficiency of integrating other trainers like differential evolution with FIS, as well as adjusting AI algorithm parameters for optimal intelligence, are lacking. Additionally, the performance of AI algorithms in the meshing process has not been thoroughly considered.
SCIENTIFIC REPORTS
(2021)
Article
Multidisciplinary Sciences
Y. Azizi, M. Bahramkhoo, A. Kazemi
Summary: The impact of non-uniform magnetic field on the heat transfer rate of nanofluid flow in double pipe heat exchangers is comprehensively studied. Computational fluid dynamics (CFD) technique is used to visualize the flow dynamics of nanofluid in the presence of a magnetic source. It is found that the magnetic field intensifies the circulation formation in the gap of the inner tube, resulting in enhanced heat transfer. Comparison of different tube geometries shows that the triangular tube is more efficient in improving the heat transfer of nanofluid flow.
SCIENTIFIC REPORTS
(2023)
Article
Green & Sustainable Science & Technology
Rafat Al-Waked, Diala Bani Mostafa, Mohammad S. Nasif
Summary: Energy recovery ventilators (ERVs) have been used in air conditioning systems to improve energy efficiency and indoor air quality, resulting in significant energy savings and reduced emissions in tropical cities like Singapore. Integrating ERVs can reduce the size of coils and lower the electrical energy needed for HVAC equipment operation, leading to potential cost savings and reduced CO2 emissions. It is recommended to design ERVs to operate at relatively low Reynolds numbers for higher effectiveness, lower pressure drop, and maximum energy recovery.
Article
Thermodynamics
Wael Al-Kouz, B. Mahanthesh, M. S. Alqarni, K. Thriveni
Summary: This study investigates the flow of non-Newtonian viscoelastic material driven by stretching of elastic sheet subjected to nonlinear Boussinesq approximation and quadratic form of Rosseland thermal radiation. Different heat source modulations were analyzed, revealing that the quadratic convection mechanism enhanced the Nusselt number, while the quadratic thermal radiation aspect reduced it. The research provides insights into determining key parameters for facilitating the desired heat transport rate.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Review
Computer Science, Interdisciplinary Applications
Syed Samar Abbas, Mohammad Shakir Nasif, Rafat Al-Waked
Summary: This paper evaluates FSI methods for predicting cardiac mechanics and hemodynamics of heart valves, highlighting the impact of different methods on valve simulations and discussing the pros and cons of each method.
SIMULATION-TRANSACTIONS OF THE SOCIETY FOR MODELING AND SIMULATION INTERNATIONAL
(2022)
Article
Thermodynamics
B. Mahanthesh, Joby Mackolil, Sabir A. Shehzad, Wael Al-Kouz
Summary: The study computed and statistically explored the nonlinear two-point partial differential boundary value problem associated with nano-pseudoplastic material flow and heat transport subject to nonlinear Boussinesq approximation. The results showed that the nonlinear thermal convection parameter has a significant impact on heat transfer rate, while the exponential heat source factor and Biot number values enhance temperature and concentration profiles.
Article
Thermodynamics
B. Mahanthesh, Wael Al-Kouz, Kharabela Swain, Prasanna Kumar Rout
Summary: This study investigates the convective heat transfer characteristics of a circular tube saturated with Darcy-Forchheimer porous matrix using the non-Newtonian Casson fluid. Through numerical simulation and analysis of parameters such as the friction factor and Nusselt number, it examines the thermal transport properties of the Casson material in the pipe.
Article
Chemistry, Multidisciplinary
Ambagaha Hewage Dona Kalpani Rasangika, Mohammad Shakir Nasif, William Pao, Rafat Al-Waked
Summary: This study found that square wave vibration is more beneficial to the thermal performance of the heat sink than sinusoidal wave vibration, as it increases the randomness of the airflow and causes direct impingement on the fin surfaces, further enhancing heat transfer.
APPLIED SCIENCES-BASEL
(2022)
Article
Materials Science, Multidisciplinary
Anas Mahmoud Atieh, Kavian Omar Cooke, Marcelo Epstein
Summary: This study proposes a new reaction-controlled diffusion model and reveals the significant role of surface reaction-controlled diffusion in the TLP bonding process.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Ecology
Asher Ahmed Malik, Mohammad Shakir Nasif, Ushtar Arshad, Ainul Akmar Mokhtar, Mohd Zahirasri Mohd Tohir, Rafat Al-Waked
Summary: Pool fires have a devastating impact on fuel storage tank farms. Using computational fluid dynamics (CFD) improves fire safety by assessing the escalation of fire-related domino effects, particularly in tank farms. A study employed the fire dynamics simulator (FDS) to model the complete evolution of the domino effect under varying wind speeds and pool fire locations. The use of artificial neural networks (ANNs) to predict fire spread probability and manage fire-induced domino effects is a notable advance.
Article
Computer Science, Interdisciplinary Applications
Anas Mahmoud Atieh, Kavian Omar Cooke, Oleksiy Osiyevskyy
Summary: This article comprehensively reviews the readiness of small and medium enterprises (SMEs) in developing countries to implement the technologies associated with Industry 4.0 and identifies the delays faced by these firms in embracing intelligent manufacturing and digitizing factories. It proposes potential solutions and suggestions for filling the gaps based on a systematic summary and integrative analysis of the literature findings.
ENGINEERING REPORTS
(2023)
Article
Mathematics, Applied
Tayyaba Mukhtar, Wasim Jamshed, Asim Aziz, Wael Al-Kouz
Summary: The main objective of this paper is to numerically investigate the results of a mathematical model for unsteady magnetohydrodynamics (MHD) boundary layer flow over a porous stretching surface. The analysis of non-Newtonian Maxwell nanofluid is presented involving the influence of porous media, thermal radiation, viscous dissipation, and joule heating through the Keller box method. The obtained numerical results are compared with existing results, and it is found that the Cu-H2O based nanofluid exhibits superior thermal conductivity.
NUMERICAL METHODS FOR PARTIAL DIFFERENTIAL EQUATIONS
(2023)
Proceedings Paper
Green & Sustainable Science & Technology
A. Boretti, S. Castelletto, W. Al-Kouz, J. Nayfeh
Summary: Forecasts based on modeling of concentrated solar tower power plants with thermal energy storage predict a cost of 6 c/kWh for dispatchable electricity, but current operating plants do not meet this cost. The experience of Crescent Dunes demonstrates the lack of maturity in this technology, with costs reaching as high as 2.38 $/kWh. It is important to base predictions on data from existing plants to avoid using unvalidated models for new plant performances.
2020 3RD INTERNATIONAL CONFERENCE ON GREEN ENERGY AND ENVIRONMENT ENGINEERING
(2021)
Proceedings Paper
Green & Sustainable Science & Technology
A. Boretti, S. Castelletto, W. Al-Kouz, J. Nayfeh
Summary: The study proposes using a multi-effect distillation system in a concentrated solar power plant to condensate steam while producing desalinized water for energy savings. Preliminary design considerations for a project in Al Khobar, Saudi Arabia, are discussed, which could potentially allow for electricity production and desalination in a sand and dust-protected environment.
2020 3RD INTERNATIONAL CONFERENCE ON GREEN ENERGY AND ENVIRONMENT ENGINEERING
(2021)
Proceedings Paper
Green & Sustainable Science & Technology
A. Boretti, S. Castelletto, W. Al-Kouz, J. Nayfeh
Summary: North European academics claim that Saudi Arabia may achieve 100% renewable energy by 2040 with PV single-axis following and battery storage, but argue that batteries and photovoltaic solar panels are not the best choice for the country's energy sector due to geology, climate conditions, and resources. They suggest that developing high-efficiency plants such as combined cycle gas turbine plants, advancing innovations for clean power generation, and investing in nuclear energy could provide better results for the economy and the environment than relying on solar photovoltaic and batteries.
2020 3RD INTERNATIONAL CONFERENCE ON GREEN ENERGY AND ENVIRONMENT ENGINEERING
(2021)
Proceedings Paper
Construction & Building Technology
Wahib Owhaib, Yousef Qanadah, Hamza Al-Ajalin, Ahmad Tuffaha, Wael Al-Kouz
Summary: This study aims to enhance PV power output by utilizing passive water-cooling system, resulting in a 10% improvement in overall PV panel efficiency.
2021 12TH INTERNATIONAL RENEWABLE ENGINEERING CONFERENCE (IREC 2021)
(2021)
Article
Thermodynamics
Mokhtar Ferhi, Ridha Djebali, Wael Al-Kouz, Said Abboudi, Ali J. Chamkha
Summary: The article conducts lattice Boltzmann simulation of magnetohydrodynamic (MHD) natural conjugate heat transfer in an apportioned cavity filled with multiwalled carbon nanotube/water nanofluid. Nanofluid properties are evaluated based on experimental correlations, investigating the effects of various parameters on heat transfer, entropy generation, and Bejan number. The results are found to be in agreement with previous numerical studies, showing how changes in parameters impact heat transfer and entropy generation.
