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
Energy & Fuels
Saad Aldossary, Anas Sakout, Mouhammad El Hassan
Summary: In this study, the heat transfer enhancement of suspending alumina nanoparticles in a flow between concentric cylinders was investigated using Computational Fluid Dynamics. The results showed that suspending 1% of alumina nanoparticles significantly enhanced heat transfer rates, while higher nanoparticle concentrations had a negligible effect on heat transfer.
Article
Thermodynamics
Yan Cao, Hamdi Ayed, Hussein Togun, Ali Shawabkeh, Mahidzal Dahari, Makatar Wae-hayee, Abir Mouldi, Riadh Marzouki
Summary: This study simulated the natural convection of water-Al2O3 nanofluid in a cold semi-annulus chamber with a hot block at the bottom, and applied an oblique magnetic field (MHD) to improve and control the flow. Increasing the volume fraction of nanoparticles was found to enhance the Nusselt number at low Rayleigh numbers, while the Nusselt number was inversely related to the Hartmann number at high Rayleigh numbers.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Amin Shahsavar, Milad Rashidi, Cagatay Yildiz, Muslum Arici
Summary: The study reveals that adding fins and increasing the volume fraction in the biological Ag-water nanofluid in a horizontal annulus significantly improve the Nu, while also increasing the thermal and frictional entropy generation rates. The impact of entropy generation varies depending on different conditions.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Tahar Tayebi, Ali J. Chamkha
Summary: The study aimed to understand heat transfer and flow characteristics by natural convection of Al2O3-Cu/water-based hybrid nanofluid-filled square domain with various corrugated solid configurations under a horizontal magnetic field. Numerical solutions were obtained for the non-dimensional equations using finite volume discretization technique. It was found that maximum heat transmission rate occurred for weak Hartmann, undulation number, undulation amplitude, and high Rayleigh and nanoparticles volumic fraction values. Moreover, the fluid/solid heat conductivity ratio parameter enhanced heat transfer at weak Rayleigh while diminishing it at high Rayleigh.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Engineering, Multidisciplinary
Abed Mourad, Abderrahmane Aissa, Azher M. Abed, Davood Toghraie, Omid Ali Akbari, Kamel Guedri, Obai Younis, Riadh Marzouki
Summary: This work numerically investigates the MHD natural convection and entropy generation characteristics of water-based hybrid nanofluid in a porous annulus. The influence of parameters such as nanoparticle volume fraction, Rayleigh number, Hartman number, Darcy number, and the position of the Koch snowflake on the flow and heat transfer is examined. Applying a Lorentz force affects the flow velocity and facilitates fluid circulation in the cavity.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Engineering, Aerospace
B. Kanimozhi, M. Muthtamilselvan, Qasem M. Al-Mdallal, Bahaaeldin Abdalla
Summary: This study numerically investigates the combined buoyancy and thermocapillary convection thermal and solutal transfer of Ag/Mgo-water hybrid nanofluid in a cylindrical porous enclosure with the impacts of Soret and Dufour. The analysis reveals that the Marangoni number performs better with lower buoyancy ratio and lower Lewis number values. The Le and D-f are efficient in mass transport, while the phi and S-r are efficient in energy transfer.
MICROGRAVITY SCIENCE AND TECHNOLOGY
(2022)
Article
Thermodynamics
N. Keerthi Reddy, H. A. Kumara Swamy, M. Sankar, Bongsoo Jang
Summary: This article focuses on the computational study of buoyant convection and heat dissipation processes in an inclined porous annulus filled with hybrid nanoliquid. The study reveals that various physical and geometric parameters have significant impacts on the movement and heat dissipation of the nanofluid in the annulus.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Physics, Multidisciplinary
P. Sudarsana Reddy, P. Sreedevi
Summary: In this study, numerical investigation was conducted on the entropy generation, flow, and heat transport features of a hybrid nanofluid, with copper and silver nanoparticles suspended in Ethylene Glycol as the common fluid. The study explored the effects of various parameters on the scatterings of isotherms, streamlines, and entropy generation through graphs, showing that silver nanoparticles have a lower temperature gradient than copper nanoparticles. The results also indicated different rates of heat transfer enhancement for silver and copper nanoparticles suspended in the base fluid.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Multidisciplinary Sciences
Hameed K. Hamzah, Farooq H. Ali, M. Hatami, D. Jing, Mohammed Y. Jabbar
Summary: Numerical Galerkin Finite Element Method (GFEM) was used to study the conjugate heat-transfer of a rotating cylinder in Fe3O4-water nanofluid, showing significant effects of parameters such as nanoparticles volume fraction and Hartmann numbers on the heat transfer performance.
SCIENTIFIC REPORTS
(2021)
Article
Materials Science, Multidisciplinary
Fatih Selimefendigil, Houssam Chouikhi, Hakan F. Oztop
Summary: This study investigates the effects of using a rotating partition on natural convection and entropy generation in a nanofluid filled double annulus under a magnetic field. The numerical analysis considers various parameters such as Rayleigh number, rotational Reynolds number, Hartmann number, fin height, and fin number. The results show that the contributions of rotations to thermal performance differ depending on the activation of rotations and magnetic field effects. Fins can further improve thermal performance, but their impact varies depending on the presence of a magnetic field and the interface rotation.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Physics, Multidisciplinary
Sufian Munawar, Najma Saleem, Waqar Ahmad Khan
Summary: Entropy production always accompanies heat transfer phenomena, leading to the destruction of available work and energy resources. This study focuses on minimizing valuable energy resources in convective heat transfer augmentation situations by reducing temperature differences and entropy generation. An optimal thermal design for augmented free convective situations is analyzed, considering a hybrid nanofluid flow in a corrugated triangular annulus heated by an underneath partial heater. Three approaches, including corrugated walls, inner heater at lower nonuniform temperature, and magnetic field effects, are applied to reduce entropy production. Numerical solutions are obtained using the finite element method, and the validity of the results is confirmed through comparison with previously published investigations. The study highlights the influential role of the thermal design in reducing entropy production, attributed to the higher thermal conductivity of the hybrid nanofluid. It is found that maintaining the inner triangular body at a temperature lower than the bottom heat source significantly reduces overall entropy, and corrugated walls minimize entropy more effectively than flat walls.
CHINESE JOURNAL OF PHYSICS
(2022)
Article
Thermodynamics
Ammar Abdulkadhim, Hameed K. Hamzah, Farooq Hassan Ali, Cagatay Yildiz, Azher M. Abed, Esam M. Abed, Muslum Arici
Summary: This study investigates magnetohydrodynamic natural convection of nanofluid in a wavy walled enclosure with a circular hot cylinder, considering the influences of the Hartmann number, Rayleigh number, and nanoparticle concentration. Results show that increasing the Hartmann number has a significant effect on Nusselt number at higher Rayleigh numbers, while heat coefficient plays a crucial role in altering Nu at low Rayleigh numbers. Heat absorption increases Nu while heat generation decreases it, and the impact of nanoparticles remains unaffected by changes in the heat coefficient.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
K. Jarray, A. Mazgar, F. Ben Nejma
Summary: This study focuses on the interaction between natural convection and thermal radiation in a cylindrical annulus, revealing that radiation significantly affects fluid flow structure and temperature distribution, enhancing heat exchanges. Volumetric entropy generation due to radiative processes of medium should not be neglected, comparable to entropy generation due to heat conduction. Increasing emissivities of cylinders intensifies entropy generation due to radiation through walls, but does not impact volumetric entropy generation.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Engineering, Multidisciplinary
Hossam A. Nabwey, A. M. Rashad, P. Bala Anki Reddy, Shaik Jakeer, M. A. Mansour, T. Salah
Summary: The introduction of hybrid nanofluids has significant applications in various engineering and industrial fields such as low-pressure drop, wider absorption range, generator cooling, good thermal conductivity, nuclear system cooling, and heat exchangers. This study focuses on the unsteady MHD free convection flow of hybrid nanofluid in an inclined wavy permeable enclosure with a square obstacle, considering the effects of radiation and heat generation/absorption. The results show that parameters such as porosity, nanoparticle volume fraction, and Hartmann number have an impact on the average Nusselt number and distribution of isothermal lines.
ALEXANDRIA ENGINEERING JOURNAL
(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
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
Mathematics
Ammar Melaibari, Salwa A. A. Mohamed, Amr E. E. Assie, Rabab A. A. Shanab, Mohamed A. A. Eltaher
Summary: This manuscript presents a mathematical formulation of the dynamical behavior of bi-directional functionally graded porous plates (BDFGPP) using unified higher-order plate theories (UHOPT) on a Winkler-Pasternak foundation. The kinematic displacement fields are utilized to satisfy the shear strain/stress conditions without correction factors. The material gradation is proposed in both axial and transverse directions using power-law distribution, and porosity distribution is defined using cosine functions in the transverse direction. The derived equations of motion and boundary conditions are solved using the two-dimensional differential integral quadrature method (2D-DIQM). A parametric analysis is conducted to investigate the effects of various factors on the natural frequencies and mode shapes of BDFGPP.
Article
Mathematics
Ammar Melaibari, Salwa A. Mohamed, Amr E. Assie, Rabab A. Shanab, Mohamed A. Eltaher
Summary: This study analyzes the responses of beams and plates using middle surface (MS) and neutral surface (NS) formulations. It derives the relations between the displacement field variables on NS and MS, and defines modified boundary conditions for immovable simply supported plates. The study shows that the responses of BDFG plates based on MS and NS formulations are identical for clamped and movable simply supported boundary conditions. However, there are differences in the responses for immovable simply supported boundary conditions if fixation constraints at different planes are not properly treated.
Article
Thermodynamics
Amjad Ali Pasha, Md Mottahir Alam, Tahar Tayebi, Samir Kasim, A. Sattar Dogonchi, Kashif Irshad, Ali J. Chamkha, Jahanzeb Khan, Ahmed M. Galal
Summary: Non-Newtonian flows are a recent aspect of industrial heat transfer and fluid mechanics that involve fluid flows that do not obey Newton's classical law. This study focused on the modeling and numerical simulation of natural convective flow, heat exchange, and entropy generation features in a hexagonal-shaped domain influenced by an inclined magnetic field and filled with a non-Newtonian shear-thickening fluid charged with Alumina nanoparticles. Three different configurations of cooling channels positioned inside the domain were considered.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Ammar A. Melaibari, Ahmed S. Elamoudi, Mohamed E. Mostafa, Nidal H. Abu-Hamdeh
Summary: The lack of water resources and industrial wastewater pollution of surface water have become major challenges. Phenol, a pollutant, enters the environment from various industries' wastewater. Due to its toxicity and stability, phenol has caused numerous problems, necessitating its removal from petroleum industry effluent. This study investigated the removal of phenol using zeolites, specifically focusing on the intermolecular interactions using molecular dynamics (MD) method. The results identified ZnO zeolite as the best adsorbent with the highest interaction and stable adsorption of phenol molecules. This work provides an efficient material for petroleum wastewater treatment and paves the way for phenol removal in petroleum wastewaters, particularly in Saudi Arabia.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2023)
Article
Nanoscience & Nanotechnology
Fatah Boufoudi, Salah Zouaoui, Sofiane Mihoub, Abdelillah Benahmed, Tahar Tayebi
Summary: This study investigates the effect of temperature and volume fraction on the thermo-physical properties of different nanofluids. Experimental results show that adding 4% Al2O3 significantly improves the thermo-physical properties, and increasing temperature decreases the viscosity. The addition of nanoparticles also increases the thermal conductivity by 13%. The (Al2O3 + CuO/Dowtherm A) hybrid nanofluid seems to be attractive for CSP applications.
JOURNAL OF NANOFLUIDS
(2023)
Article
Nanoscience & Nanotechnology
Kamel Zitouni, Lakhdar Aidaoui, Yahia Lasbet, Tahar Tayebi
Summary: The study investigates the heat transfer and entropy generation of laminar flow of a ferrofluid in different cross-section channels subjected to partial and full magnetic field. A constant heat flux condition is applied on the external surface and the conservation equations are solved numerically with a second-order precision. The effects of magnetic field direction and intensity on thermodynamic features, heat transfer, and entropy generation are examined. Results show that the circular cross-section channel offers higher heat transfer rates and lower entropy generation compared to non-circular cross-section channels.
JOURNAL OF NANOFLUIDS
(2023)
Article
Nanoscience & Nanotechnology
Kaddour Rakrak, Abdelillah Benahmed, Soufiane Belabbes, Tahar Tayebi
Summary: This paper presents a numerical analysis study on the effect of water-copper nanofluids in a double-pass flat solar collector on its dynamic and thermal performance. The study solves the governing equations using a CFD ANSYS code and finite volume method. Results show that the increase in volume fraction promotes heat transfer and the presence of nanoparticles plays a critical role in convective heat exchange.
JOURNAL OF NANOFLUIDS
(2023)
Article
Multidisciplinary Sciences
Faiz Muhammad, Tahar Tayebi, Kashif Ali, Emad Hasani Malekshah, Sohail Ahmad
Summary: The present work aims to study the flow of mass and heat transfer through Darcy Forchheimer porous medium, involving both microorganisms and nanoparticles. The participation of gyrotactic microorganisms enhances the thermal characteristics of various energy systems. The amalgamation of microorganisms in nanofluids improves the fluid's thermal properties and flow stability. Chemical reaction and heat generation effects are considered as well. The simplified governing model equations are solved using an algorithm in MATLAB and compared with previous results for validation.
Article
Green & Sustainable Science & Technology
Isam Y. Al-Filali, Reda M. S. Abdulaal, Ammar A. Melaibari
Summary: Financing education is a major concern due to rising educational expenditure, leading to a shift towards diversified financing resources. This paper introduces the Green Ocean Strategy for Financial Sustainability (GOSFS), a novel approach to optimize universities' investment sources and ensure their financial sustainability. Through a roadmap of 18 steps and focusing on three key areas, GOSFS was applied to King Abdulaziz University as a case study, setting long-term and overall goals. The paper also provides recommendations for accelerating business growth and engaging the university investment ecosystem.
Article
Nanoscience & Nanotechnology
Mohammed Benkhedda, Tahar Tayebi, Ali J. Chamkha
Summary: This study numerically investigates the hydrodynamic and thermal characteristics of water-based nanofluid containing TiO2 or CuO nanoparticles flowing in a 3D uniformly heated horizontal annulus. Four different models are developed using various combinations of available thermal conductivity and viscosity correlations. The effects of Grashof number, volume fraction, and nanoparticle type on various parameters are explored. The results demonstrate that all developed models show improvement in Nusselt number and heat transfer coefficient with the addition of nanoparticles, with model D showing the largest enhancement of 23.5% and model B showing the smallest enhancement of 1.16%. The highest Performance Evaluation Criteria (PEC) are achieved with model D (1.263) followed by model C (1.074).
JOURNAL OF NANO RESEARCH
(2023)
