Article
Engineering, Mechanical
Nidhi Singh, Manish K. Khandelwal, Abhishek K. Sharma
Summary: The influence of applied magnetic field on the stability of liquid metal flows in a vertical channel is investigated. The results show that the stability of the flow increases with increasing strength of the magnetic field, while a decrease in thermal diffusivity provokes instability.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Multidisciplinary
Syafiq Zainodin, Anuar Jamaludin, Roslinda Nazar, Ioan Pop
Summary: This study aims to investigate the thermal and mass behavior of hybrid ferrofluid in a permeable vertical flat plate. The partial differential equation is simplified through similarity transformation, and numerical solutions are obtained using MATLAB for different parameters. Dual solutions are found in regions of opposing and assisting flow, and hybrid ferrofluids with CoFe2O4 nanoparticles exhibit higher heat transfer rates compared to ferrofluids and base fluid. The order of chemical reaction significantly affects the mass transfer rate, while the presence of thermal and concentration slips reduces the heat and mass transfer rates and delays boundary layer separation.
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, Multidisciplinary
Nepal Chandra Roy, Ioan Pop
Summary: This study investigates the dual solutions for mixed convection flow of an Oldroyd-B fluid with alumina nanoparticles over a shrinking sheet, considering the effects of magnetic field and heat source/sink. The results show that some published findings are unrealistic. It is observed that with higher values of Deborah numbers, suction parameter, and magnetic field parameter, the occurrence of dual solutions becomes wider and the local skin friction coefficient and local Nusselt number increase. Additionally, dual solutions exist in a broader domain when the volume fraction of alumina nanoparticles is less than or equal to 0.05.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Multidisciplinary Sciences
Abdulaziz Alsenafi, M. Ferdows
Summary: The study focused on the steady mixed convection flow towards an isothermal permeable vertical cylinder nested in a fluid-saturated porous medium, applying the Darcy model to observe bioconvection. The results indicated the existence of dual solutions in opposing flow beyond a critical point, where both solutions are connected, influenced by the systems' parameters.
SCIENTIFIC REPORTS
(2021)
Article
Thermodynamics
Liaquat Ali Lund, Zurni Omar, Jawad Raza, Ilyas Khan
Summary: This study investigates the heat transfer characteristics, stability analysis, and multiple solutions of magnetohydrodynamic flow of hybrid nanofluid caused by nonlinear shrinking/stretching surface under high temperatures. It is found that the velocity of the hybrid nanofluid decreases in the first solution and increases in the second solution as both the magnetic and permeability coefficient parameters increase. Furthermore, dual solutions are found to exist only on the shrinking surface under specific parameter values in the case of suction.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Mathematics, Applied
Amjid Rashid, Abdullah Dawar, Muhammad Ayaz, Saeed Islam, Ahmed M. Galal, Humaira Gul
Summary: This study investigates the flow characteristics of a water-based hybrid nanofluid consisting of silver and alumina nanoparticles past a spinning disk. The effects of Brownian motion, activation energy, magnetic field, and thermophoresis are taken into account. The partial differential equations (PDEs) are transformed into ordinary differential equations (ODEs) through suitable correspondence transformations. The modeled equations are solved using a semi-analytical method known as HAM. Graphical representations of the nanofluid and hybrid nanofluid profiles are used. The findings show a decrease in the radial and tangential velocities of the nanofluids and hybrid nanofluid with an increase in the magnetic factor. The hybrid nanofluid exhibits higher growth and better thermal conductivity than the nanofluids due to the magnetic factor.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2023)
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
Energy & Fuels
Munawwar Ali Abbas, Bashir Ahmed, Li Chen, Shamas Ur Rehman, Muzher Saleem, Wissam Sadiq Khudair
Summary: This paper investigates the entropy generation in a micropolar fluid over a stretching surface. The study analyzes the influence of various physical parameters on velocity, microrotation, and temperature profiles. It also examines the impact of thermal radiation, porous medium, magnetic field, and viscous dissipation. The findings are valuable for the petroleum industry and engineering designs.
Article
Thermodynamics
He Wang
Summary: This study investigates the magnetohydrodynamic (MHD) flows around a 180-degree sharp bend with volumetric heating. The flow is quasi-two-dimensional, with upward flow in the inlet channel and downward flow in the outlet channel, influenced by a strong transverse magnetic field. The motivation is the design of liquid metal blankets with U-shaped ducts for future nuclear fusion reactors. The flow is found to be either steady-state or oscillating, depending on the strength of internal volumetric heating and magnetic field. The oscillations result from the instability of recirculation bubbles due to Kelvin-Helmholtz instability.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Computer Science, Artificial Intelligence
Anuar Jamaludin, Roslinda Nazar, Kohilavani Naganthran, Ioan Pop
Summary: This work presents a theoretical model for mixed convection boundary layer flow and heat transfer in a hybrid nanofluid past an exponentially stretching/shrinking sheet. By modifying and solving the governing equations, two different solutions were obtained, with the study showing the influence of porosity parameter and nanoparticle volume fraction on the existence range of dual solutions. The heat transfer performance of hybrid nanofluid was found to be superior to ordinary nanofluid, making the proposed model significant in extrusion processes.
NEURAL COMPUTING & APPLICATIONS
(2021)
Article
Engineering, Multidisciplinary
Iskander Tlili, Hossam A. Nabwey, M. Girinath Reddy, N. Sandeep, Maddileti Pasupula
Summary: In this study, the flow and heat transfer of water-ethylene glycol based Ti-Cu hybrid nanofluid in magnetohydrodynamic Sakiadis flow were investigated numerically. The results showed differences in thermal boundary layer between the Blasius and Sakiadis flows, with higher energy transport rate observed in moving needle compared to fixed needle scenarios. Additionally, it was found that Ti-Cu/EG-water hybrid nanofluid exhibited higher heat transfer rate than water-EG/Ti nanofluid.
AIN SHAMS ENGINEERING JOURNAL
(2021)
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
Engineering, Multidisciplinary
Nur Syahirah Wahid, Norihan Md Arifin, Najiyah Safwa Khashi'ie, Ioan Pop, Norfifah Bachok, Mohd Ezad Hafidz Hafidzuddin
Summary: This study investigates the MHD radiative flow of a hybrid alumina-copper/water nanofluid past a permeable vertical plate with mixed convection. By utilizing numerical solutions and graphical illustrations, it is found that reducing the concentration volume of copper and increasing the magnetic and radiation parameters can hinder boundary layer separation and enhance heat transfer.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Mechanics
Sohail Ahmed, Zhi-Min Chen, Muhammad Ishaq
Summary: This study investigates the homogeneous-heterogeneous reactions in the magnetohydrodynamic boundary layer stagnated flow of an Al2O3-Cu-water base hybrid nanofluid. A newly developed two-phase hybrid nanofluid model is used to understand the nanofluid behaviors. The results show that hybrid nanofluids play a key role in the transport mechanism of the homogeneous-heterogeneous reactions.
Article
Thermodynamics
Najiyah Safwa Khashi'ie, Norihan Md Arifin, Ioan Pop, Roslinda Nazar
Summary: The impact and capability of Cu-Al2O3/water nanoliquid as the heat transfer fluid during melting heat transfer on a moving surface are numerically investigated. The results show that the use of hybrid nanofluid assists boundary layer separation, but also increases the heat transfer rate.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Nurul Amira Zainal, Roslinda Nazar, Kohilavani Naganthran, Ioan Pop
Summary: This study aims to analyze the flow and heat transfer performance of hybrid nanofluid on a moving wedge, revealing that adding nanoparticles improves heat transfer efficiency, while the activation energy factor reduces mass transfer rates and the binary reaction rate increases mass transfer rates with multiple solutions provided.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2022)
Article
Thermodynamics
Iskandar Waini, Anuar Ishak, Ioan Pop, Roslinda Nazar
Summary: The study investigates the flow of Cu-Al2O3/water hybrid nanofluid over a shrinking sheet in the presence of the magnetic field and dust particles. Two solutions are found for the dual solutions, with the stability of only one solution proven as time evolves. The impact of physical parameters on flow and thermal characteristics are analyzed, showing the importance of suction strength, and on the heat transfer rate on the shrinking sheet.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2022)
Article
Physics, Multidisciplinary
Anuar Jamaludin, Roslinda Nazar, Ioan Pop
Summary: The study focuses on mixed convection stagnation-point flow and heat transfer of incompressible Cross fluid on a permeable shrinking sheet, with suction and thermal radiation effects. Numerical solutions obtained revealed dual solutions for both assisting and opposing flow regions, with stability analysis showing the upper branch solution to be stable and the lower branch solution to be unstable. Factors such as Weissenberg number, Prandtl number, and suction parameter were found to strongly influence the range of existence for dual solutions.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2022)
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
Thermodynamics
Nurul Amira Zainal, Roslinda Nazar, Kohilavani Naganthran, Ioan Pop
Summary: This study numerically investigates the unsteady stagnation-point flow past a stretching/shrinking horizontal cylinder, considering the impact of a magnetic field. The results indicate that increasing the concentration of nanoparticles and altering the mixing ratio can enhance heat transfer efficiency, while increasing the magnetic parameter leads to a decrease in heat transfer rate.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Nurul Amira Zainal, Roslinda Nazar, Kohilavani Naganthran, Ioan Pop
Summary: According to previous research, bioconvection has been recognized as an important mechanism in current engineering and environmental systems. This study aims to analyze the effects of this type of convection on the flow behavior and heat transfer performance in a hybrid nanofluid with alumina-copper/water. The study also considers the impact of a modified magnetic field on boundary layer flow. By transforming the multivariable differential equations into ordinary differential equations and using the bvp4c procedure, multiple solutions are obtained. The findings show that increasing nanoparticle concentration leads to a decrease in skin friction coefficient, while the inclusion of aligned angles results in an upward trend in heat transfer performance.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2022)
Article
Chemistry, Multidisciplinary
Nurul Amira Zainal, Roslinda Nazar, Kohilavani Naganthran, Ioan Pop
Summary: Building upon previous research, this study formulates a new mathematical model to investigate the stagnation point flow in Maxwell fluid, taking into account the effects of thermal radiation and heat transfer. Using similarity variables and numerical methods, approximate solutions are obtained, revealing the enhancement of heat transfer rate in Maxwell hybrid nanofluids.
Article
Chemistry, Multidisciplinary
Nurul Amira Zainal, Roslinda Nazar, Kohilavani Naganthran, Ioan Pop
Summary: This paper investigates the impact of unsteady hybrid nanofluid flow on a moving Falkner-Skan wedge with a convective boundary condition. Through the conversion and numerical solution of partial differential equations, it is found that dual-type nanoparticles and wedge angle parameters improve thermal efficiency, while the unsteadiness parameter and the Biot number of the working fluid have little effect on efficiency.
Article
Mathematics
Rohana Abdul Hamid, Roslinda Nazar, Kohilavani Naganthran, Ioan Pop
Summary: This article conducts a numerical study on the boundary layer flow of ferrofluid, including Stefan blowing, velocity and thermal slip, and Soret effects in the stagnation region over a stretching/shrinking surface. The governing equations were solved using the bvp4c function in MATLAB. The results show that a stronger magnetic field is required to identify the numerical solutions past the shrinking surface, and the Stefan blowing reduces the availability of solutions. Stability analysis confirms that only one solution is reliable and stable for certain values of the shrinking parameter.
Article
Physics, Multidisciplinary
A'isyah Jaafar, Iskandar Waini, Anuar Jamaludin, Roslinda Nazar, Ioan Pop
Summary: The essence of this study is to explore the steady flow and heat transfer of a nonlinearly stretching/shrinking hybrid nanofluid with the effects of magnetohydrodynamics (MHD), thermal radiation, and suction. It was found that water has better heat transfer performance compared to nanofluids and hybrid nanofluids, and the thermal boundary layer thickness increases with the increase of magnetic and suction parameters.
CHINESE JOURNAL OF PHYSICS
(2022)
Article
Mathematics
Nurul Amira Zainal, Roslinda Nazar, Kohilavani Naganthran, Ioan Pop
Summary: This research investigates the use of hybrid nanofluids in unsteady separated stagnation-point flow. The results show that increasing stagnation strength parameters improves the skin friction coefficient and heat transfer rate, while the addition of suction parameters increases thermal conductivity. Additionally, reducing the unsteadiness parameter enhances heat-transfer performance.
Article
Mathematics
Nurul Amira Zainal, Roslinda Nazar, Kohilavani Naganthran, Ioan Pop
Summary: In this study, the impact of magnetic field on the unsteady separated stagnation-point flow of hybrid nanofluid is numerically investigated, taking into account viscous dissipation and Joule heating. A new mathematical model for hybrid nanofluid is developed, and similarity solutions in the form of ordinary differential equations are obtained. The findings show that the skin friction coefficient and heat transfer rate of the fluid increase with the nanoparticle volume fraction and unsteadiness parameter. The magnetic and acceleration parameters also have a significant effect on the heat transfer performance.
