Article
Physics, Multidisciplinary
Rusya Iryanti Yahaya, Norihan Md Arifin, Ioan Pop, Fadzilah Md Ali, Siti Suzilliana Putri Mohamed Isa
Summary: The study investigates the effects of suction on the oblique stagnation-point flow of hybrid nanofluid over a shrinking surface. It reveals that increasing the suction parameter enhances skin friction and temperature gradient, reduces the boundary layer thickness, slows down boundary layer separation, and improves heat transfer rate at the shrinking surface.
CHINESE JOURNAL OF PHYSICS
(2023)
Article
Thermodynamics
Iskandar Waini, Joan Pop, Sakhinah Abu Bakar, Anuar Ishak
Summary: This study investigates the effects of radiation and magnetohydrodynamic on the flow of an exponentially shrinking sheet in a hybrid nanofluid. Numerical results show that dual solutions arise for the shrinking case, with one solution being stable over time. The heat transfer rate increases with the rise of the magnetic field and hybrid nanoparticles, and is higher in the presence of radiation.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2022)
Article
Engineering, Multidisciplinary
Nurul Amira Zainal, Roslinda Nazar, Kohilavani Naganthran, Ioan Pop
Summary: This study proposes a unique model to investigate the unsteady stagnation point flow in a hybrid nanofluid induced by an exponentially permeable stretching/shrinking sheet with a magnetic field. The results show that the skin friction coefficient and local Nusselt number increase by enhancing the suction/injection parameter and nanoparticles volume fraction.
ENGINEERING SCIENCE AND TECHNOLOGY-AN INTERNATIONAL JOURNAL-JESTECH
(2021)
Article
Thermodynamics
Iskandar Waini, Anuar Ishak, Ioan Pop
Summary: This study investigates the impinging flow on a shrinking cylinder in Al2O3-Cu/water hybrid nanofluid subjected to prescribed surface heat flux. Two solutions are possible for the shrinking case, where one is stable in the long run. Friction and heat transfer on the surface increase with higher values of φhnfand γ.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2021)
Article
Thermodynamics
Ioan Pop, Mohammadreza Nademi Rostami, Saeed Dinarvand
Summary: The study focuses on the laminar magnetohydrodynamics mixed convection stagnation-point flow of an alumina-graphene/water hybrid nanofluid with spherical nanoparticles over a vertical permeable plate, with dual similarity solutions. The results show that the magnetic parameter and wall permeability parameter widen the range of buoyancy parameter for solution existence, while the second nanoparticle mass has the opposite effect. Mass suction at the plate surface and the magnetic parameter reduce the thickness of both the hydrodynamic and thermal boundary layers.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2021)
Article
Mathematics, Applied
Golam Mortuja Sarkar, Bikash Sahoo
Summary: This paper investigates the steady three-dimensional Hiemenz flow of a viscous incompressible fluid over a stretching/shrinking sheet. Numerical solutions for the shear stress parameters and displacement thicknesses of the sheet are obtained and compared with asymptotic solutions. Dual solutions of the similarity equations are found for both the stretching and shrinking cases, and a stability analysis reveals the physically reliable solution.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2022)
Article
Chemistry, Analytical
Sumayyah Alabdulhadi, Anuar Ishak, Iskandar Waini, Sameh E. Ahmed
Summary: This study investigates magnetohydrodynamic flow induced by a moving surface in a nanofluid and the effects of suction and solar radiation using the Buongiorno model. The numerical findings, obtained using MATLAB software, illustrate the impacts of different governing parameters on heat and mass transfer rates, as well as nanoparticle concentration and temperature profiles. Non-unique solutions are found for a specific variation of the shrinking strength, and temporal stability analysis shows only one solution remains stable over time. Increasing the Brownian motion parameter reduces the local Sherwood and Nusselt numbers for both solutions, while increasing the thermophoresis parameter decreases the heat transfer rate and increases the mass transfer rate.
Article
Thermodynamics
Nurul Amira Zainal, Roslinda Nazar, Kohilavani Naganthran, Joan Pop
Summary: This study investigates the unsteady stagnation point flow on a permeable stretching/shrinking Riga plate in Al2O3-Cu/H2O nanofluid and considers the effect of thermal radiation. The mathematical model is solved using transformations and MATLAB system, providing multiple solutions and analyzing the impact of various control parameters.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2022)
Article
Thermodynamics
Iskandar Waini, Anuar Ishak, Ioan Pop
Summary: This paper investigates the flow of a hybrid nanofluid towards a stagnation point on an exponentially stretching/shrinking vertical sheet with buoyancy effects. The authors found that the heat transfer rate is higher for the Al2O3-Cu/water hybrid nanofluid compared to Cu/water nanofluid, and observed non-uniqueness of solutions for certain physical parameters. Additionally, bifurcation of solutions was noticed in the downward buoyant force and shrinking regions.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2021)
Article
Thermodynamics
Nurul Amira Zainal, Roslinda Nazar, Kohilavani Naganthran, Ioan Pop
Summary: This study analyzed the unsteady electro-magnetohydrodynamic stagnation point flow in a hybrid nanofluid on a stretching/shrinking sheet, and found that the inclusion of nanoparticles increases the skin friction coefficient and local Nusselt number. The coordination of the electric and magnetic fields delays the progression of the fluid, while the unsteadiness parameter has a decreasing impact on heat transfer performance.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Najiyah Safwa Khashi'ie, Iskandar Waini, Norihan Md Arifin, Ioan Pop
Summary: This paper numerically analyzes the unsteady stagnation-point flow of Cu-Al2O3/H2O hybrid nanofluid towards a radially shrinking Riga surface with thermal radiation. The results show that the application of Riga plate generates an electro-magneto-hydrodynamics (EMHD) parameter, which enhances the skin friction coefficient and heat transfer process. The width parameter also affects the skin friction coefficient and heat transfer rate. The addition of radiation and unsteadiness decelerating parameters boosts the thermal rate.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2023)
Article
Physics, Multidisciplinary
Najiyah Safwa Khashi'ie, Norihan Md Arifin, Ioan Pop, Roslinda Nazar
Summary: The numerical examination of gyrotactic microorganisms in the mixed convection stagnation point flow of CuAl2O3/water hybrid nanofluid towards an immovable plate revealed that the hybrid nanofluid is essential in delaying the flow separation process and enhancing heat and mass transfer rates, including microorganism density. This hybrid nanofluid showed superior performance compared to Cu- and Al2O3-water nanofluids.
CHINESE JOURNAL OF PHYSICS
(2021)
Article
Engineering, Multidisciplinary
Nur Syahirah Wahid, Norihan Md Arifin, Ioan Pop, Norfifah Bachok, Mohd Ezad Hafidz Hafidzuddin
Summary: Nanofluids have potential applications in industry and further research on flow control is required. This study investigates the magnetohydrodynamic stagnation point flow of alumina-water nanofluid on a shrinking sheet, considering viscous dissipation, melting, and Joule heating effects. The findings reveal two possible solutions at the shrinking condition, with one being stable. Increasing the melting effect and decreasing the nanoparticle volume fraction and Eckert number can enhance heat transmission in the fluid flow system. The study suggests considering a higher alumina volume fraction to delay flow separation and maintain laminar flow.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Engineering, Multidisciplinary
Nurul Amira Zainal, Iskandar Waini, Najiyah Safwa Khashi'ie, Abdul Rahman Mohd Kasim, Kohilavani Naganthran, Roslinda Nazar, Ioan Pop
Summary: The aim of this study is to investigate the flow behavior of the Al2O3-Cu/H2O hybrid nanofluid over a stretching/shrinking sheet, taking into account Arrhenius kinetics and thermal radiation. A novel mathematical model for the hybrid nanofluid is proposed, considering multiple effects that have not been addressed in prior literature. The findings show the existence of dual solutions within the defined ranges of physical parameters, and the hybrid nanofluid exhibits enhanced heat transfer performance compared to viscous flow and nanofluid flow.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Engineering, Multidisciplinary
Zafar Mahmood, Sayed M. Eldin, Khadija Rafique, Umar Khan
Summary: This paper presents a new mathematical model for enhancing heat transfer using tri-hybrid nanofluids. The study investigates the influence of heat production/abstraction and mass suction on MHD stagnation point flow in a nonlinearly stretching/shrinking sheet of a tri-hybrid nanofluid based on water. Results show that the Nusselt number of the nanofluid, hybrid nanofluid, and tri-hybrid nanofluid are improved by 9.8%, 19.85%, and 44.04% respectively compared to ordinary fluid.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
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
Engineering, Multidisciplinary
Habibis Saleh, Kohilavani Naganthran, Ishak Hashim, Mohammad Ghalambaz, Roslinda Nazar
Summary: This paper investigates transient free convection in an open cavity with two elastic thin fins, solving governing equations by the finite element method. The results show that maximum heat transfer enhancement occurs at suitable parameters, highlighting the importance of fin direction and aperture size.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Physics, Multidisciplinary
Rohana Abdul Hamid, Roslinda Nazar, Kohilavani Naganthran, Ioan Pop
Summary: This study examines the particulate suspension's transport phenomena in the magnetite ferrofluid past a permeable non-isothermal moving surface. The results show that the kerosene-based ferrofluid has a better convective heat transfer rate, while the presence of dust particles in the ferrofluid increases the frictional drag force on the shrinking sheet.
CHINESE JOURNAL OF PHYSICS
(2022)
Article
Thermodynamics
Nurul Amira Zainal, Roslinda Nazar, Kohilavani Naganthran, Joan Pop
Summary: This study investigates the unsteady stagnation point flow on a permeable stretching/shrinking Riga plate in Al2O3-Cu/H2O nanofluid and considers the effect of thermal radiation. The mathematical model is solved using transformations and MATLAB system, providing multiple solutions and analyzing the impact of various control parameters.
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
Rusya Iryanti Yahaya, Norihan Md Arifin, Ioan Pop, Fadzilah Md Ali, Siti Suzilliana Putri Mohamed Isa
Summary: This paper investigates the flow of nanofluids over a permeable stretching/shrinking surface and their impact on heat transfer performance. The study found that the thermal conductivity of nanofluids is enhanced with the increase of the heat source parameter. Cu/H2O nanofluid exhibits better heat transfer performance compared to other nanofluids.
Article
Thermodynamics
Rusya Iryanti Yahaya, Norihan Md Arifin, Ioan Pop, Fadzilah Md Ali, Siti Suzilliana Putri Mohamed Isa
Summary: This study investigates the stagnation point flow of Al2O3-Cu/H2O hybrid nanofluid over a radially shrinking disk with the presence of a magnetic field, viscous-Ohmic dissipation, and convective boundary condition. The results show that the hybrid nanofluid has better heat transfer performance compared to the pure nanofluid, with the presence of a magnetic field, suction, convective boundary condition, and increased nanoparticle volume fraction enhancing the heat transfer properties. On the other hand, the presence of viscous-Ohmic dissipation reduces the heat transfer performance.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2023)
Article
Physics, Multidisciplinary
Rusya Iryanti Yahaya, Norihan Md Arifin, Ioan Pop, Fadzilah Md Ali, Siti Suzilliana Putri Mohamed Isa
Summary: The study investigates the effects of suction on the oblique stagnation-point flow of hybrid nanofluid over a shrinking surface. It reveals that increasing the suction parameter enhances skin friction and temperature gradient, reduces the boundary layer thickness, slows down boundary layer separation, and improves heat transfer rate at the shrinking surface.
CHINESE JOURNAL OF PHYSICS
(2023)
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.
