Article
Engineering, Multidisciplinary
Umair Khan, Aurang Zaib, Ioan Pop, Sakhinah Abu Bakar, Anuar Ishak
Summary: This study investigates the buoyancy effect on time-dependent flow and heat transfer induced by a hybrid micropolar nanofluid over a permeable shrinking or stretching vertical flat plate. The analysis reveals significant insights into the behavior of the solution under different controlling parameters and for both stretching and shrinking cases.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Thermodynamics
Nur Syazana Anuar, Norfifah Bachok, Ioan Pop
Summary: This paper discusses the stability analysis of Cu-Al2O3/water nanofluid under radiation and suction effects on a rotating stretching/shrinking sheet. The study reveals non-unique solutions for certain shrinking parameter values and significant impact of suction parameter on obtaining solutions. The presence of copper nanoparticle volume fractions results in increased local skin friction and decreased local Nusselt number on the shrinking surface.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2021)
Article
Thermodynamics
Natalia C. Rosca, Alin V. Rosca, Amin Jafarimoghaddam, Ioan Pop
Summary: The purpose of this paper is to investigate laminar boundary layer cross flow and heat transfer on a rotational stagnation-point flow over a porous wall submerged in hybrid nanofluids. It was found that the basic similarity equations admit dual solutions for stretching/shrinking surfaces, with the upper branch solution being physically realizable while the lower branch solution is not. The authors believe that the numerical results presented in this paper are new and original.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2021)
Article
Physics, Multidisciplinary
Rusya Iryanti Yahaya, Mohd Shafie Mustafa, Norihan Md Arifin, Ioan Pop, Fadzilah Md Ali, Siti Suzilliana Putri Mohamed Isa
Summary: This study focuses on the three-dimensional flow of a hybrid nanofluid over a biaxial stretching/shrinking surface, revealing that the Cu-Al2O3/H2O hybrid nanofluid has the highest temperature profile. By increasing the shrinking and radiation parameters, the temperature profile of the hybrid nanofluid can be further enhanced. Response surface methodology (RSM) analysis shows that the suction parameter positively affects the heat transfer rate, while the nanoparticle volume fraction of Cu and Al2O3 has the opposite effect.
CHINESE JOURNAL OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
Nepal Chandra Roy, Ioan Pop
Summary: This study investigates the flow and heat transfer behavior of a magnetohydrodynamic nanofluid past over an unsteady permeable shrinking sheet. The numerical solutions obtained show good agreement with the available solutions, and it is found that the increase in volume fraction of nanoparticles, mass transfer parameter, magnetic field parameter, and velocity ratio parameter leads to a significant increase in the local skin friction coefficient and the local Nusselt number. Moreover, all of these parameters increase the occurrence of dual solutions. The velocity and temperature of the fluid increase with a higher volume fraction of nanoparticles, while an increase in mass transfer and magnetic field parameters results in an increase in velocity but a decrease in temperature. However, an increase in the velocity ratio parameter shows the opposite effect.
CHINESE JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
Nepal Chandra Roy, Ioan Pop
Summary: The effects of magnetic field, convective heating, and thermal radiation on the dual solutions and boundary layer separations of nanofluid flow over a nonlinearly shrinking sheet are investigated in this study. The shrinking sheet problems have practical applications in polymer technology and metallurgy. The governing equations are reduced to dimensionless equations using similarity transformations and solved using the shooting method. Comparisons with available data show good agreement. It is found that the skin friction coefficient and local Nusselt number decrease with higher volume fraction of nanoparticles but increase with increasing suction parameter. Local Nusselt number is substantially increased with larger shrinking index parameter and Biot number. Boundary layer separation and the existence of dual solutions are diminished by higher suction parameter and magnetic parameter, but increased by higher volume fraction of nanoparticles and shrinking index parameter. The velocity decreases and the temperature increases with increasing nanoparticle volume fraction and decreasing suction parameter.
CHINESE JOURNAL OF PHYSICS
(2023)
Article
Thermodynamics
Ubaidullah Yashkun, Khairy Zaimi, Nor Ashikin Abu Bakar, Anuar Ishak, Ioan Pop
Summary: This study investigates the heat transfer characteristics of MHD hybrid nanofluid over a linear stretching and shrinking surface with suction and thermal radiation effects. The study finds that the heat transfer efficiency of the hybrid nanofluid is greater than the nanofluid, and dual solutions exist for a specific range of the stretching/shrinking parameter. Additionally, the skin friction coefficient and local Nusselt number increase with suction effect, and suction and thermal radiation widen the range of the stretching/shrinking parameter for which solutions exist.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2021)
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
Physics, Multidisciplinary
U. S. Mahabaleshwar, A. B. Vishalakshi, Helge Andersson
Summary: In this article, the flow of a hybrid nanofluid over a stretching/shrinking sheet and its impact on heat transfer are investigated. An exact analytical solution is obtained through mathematical analysis, and interesting phenomena are observed. This study is of great significance for industrial applications.
CHINESE JOURNAL OF PHYSICS
(2022)
Article
Chemistry, Physical
Umair Khan, Iskandar Waini, Anuar Ishak, Ioan Pop
Summary: The time-dependent stagnation point flow and heat transfer of a water-based hybrid nanofluid from a radially permeable shrinking or stretching surface are investigated. Numerical results indicate the existence of dual solutions, with only one being stable, and the hybrid nanofluid enhances heat transfer rate compared to a regular fluid.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
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
Thermodynamics
Umair Khan, Aurang Zaib, Ioan Pop, Iskandar Waini, Anuar Ishak
Summary: This paper investigates the behavior of mixed convection magnetohydrodynamic flow and heat transfer induced by a nonlinear stretching/shrinking sheet in a nanofluid with a convective boundary condition using the Tiwari-Das mathematical nanofluid model. The results show that for a certain range of the stretching/shrinking parameter, two solutions are obtained, with the friction factor and heat transfer rate increasing for the upper branch solution and decreasing for the lower branch solution. The effect of nanoparticle volume fraction on heat transfer rate behaves differently in the presence of mixed convection effect, and the fluid temperature increases with increasing Biot number for both solutions.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2022)
Article
Thermodynamics
Najiyah Safwa Khashi'ie, Norihan Md Arifin, Natalia C. Rosca, Alin Rosca, Ioan Pop
Summary: This study examines the effects of thermal radiation and homogeneous-heterogeneous reactions in the flow of three-dimensional hybrid nanofluids, showing that the suction parameter is necessary to induce a steady solution for the shrinking parameter, and that the fluid concentration on the shrinking sheet is reduced with the addition of surface reactions. The findings can serve as a reference for researchers to further analyze heat transfer performance and fluid stability.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2022)
Article
Thermodynamics
Ubaidullah Yashkun, Khairy Zaimi, Anuar Ishak, Ioan Pop, Rabeb Sidaoui
Summary: This study focuses on enhancing thermal conductivity using a hybrid nanofluid mathematical model, combining natural mixed convection and Joule heating. Results show dual solutions, indicating the novelty of the study. The increase in copper volume fraction and Eckert number leads to a decrease in surface temperature, resulting in a decrease in heat transfer rate.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2021)
Article
Mathematics, Applied
I. Waini, A. Ishak, I. Pop
Summary: The study analyzes the mixed convection flow with thermal radiation under MHD effects, as well as considering the impact of Cu-Al2O3 nanoparticles and dust particles. By using similarity variables to simplify the governing equations to similarity equations, the numerical solutions are obtained. The results indicate non-uniqueness of solutions for the shrinking case, with heat transfer rate and friction factor increasing with copper nanoparticle volume fraction and magnetic parameter, while decreasing with assisting flow and thermal radiation rise.
APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION
(2022)
Article
Physics, Multidisciplinary
S. S. S. Sen, M. Das, M. K. Nayak, O. D. Makinde
Summary: This paper investigates the characteristics of natural convection flow and heat transfer of micropolar hybrid nanofluid. The results show the variations of velocity, temperature, skin friction and Nusselt number profiles for different parameters.
Article
Mechanics
Martin Ndi Azese, Valjacques Nyemb Nsoga, Barbare J. Avouna Mvondo, Oluwole Daniel Makinde, Gilbert Batjom Batjom, Hollandine Sami Kouaji
Summary: This study analytically explores the flow of a Newtonian liquid forced into a narrow tube by an unsteady pressure gradient and an external force dependent on the encroachment rate. The findings have important implications for medicine and the printing industry. By comparing rectangular and circular channels, interesting similarities are discovered. The study also highlights the early and long-term dynamic characteristics.
Article
Mathematics, Interdisciplinary Applications
Baba Seidu, Oluwole Daniel Makinde, Ibrahim Yakubu Seini
Summary: This paper studies the impact of HIV and TB on workforce productivity from the perspective of dynamical systems. A nonlinear ordinary differential equation model is used to analyze the dynamics of HIV-TB co-infection and its effect on workforce productivity. The study finds that the most cost-effective strategy for controlling the spread of co-infection and improving productivity is the combination of preventative and curative measures along with skills training.
DISCRETE DYNAMICS IN NATURE AND SOCIETY
(2023)
Article
Thermodynamics
Himanshu Upreti, Priya Bartwal, Alok Kumar Pandey, O. D. Makinde
Summary: This study aims to analyze the heat transfer characteristics of stagnation point flow of Casson nanofluid over a stretching sheet using an induced magnetic field and the Cattaneo-Christov model. The coupled nonlinear partial differential equations are solved using bvp4c. The heat transfer and flow characteristics of Au-blood based Casson nanofluid are discussed graphically. A comparison with previous articles shows good agreement.
NUMERICAL HEAT TRANSFER PART B-FUNDAMENTALS
(2023)
Article
Chemistry, Analytical
Oluwole Daniel Makinde, Anuoluwa Esther Makinde
Summary: This paper investigates the flow structure and heat transfer characteristics of a reactive variable viscosity PAO-based nanolubricant containing TiO2 nanoparticles in a microchannel. Nonlinear model equations are solved using the shooting method and Runge-Kutta-Fehlberg integration. The effects of thermophysical parameters on velocity, temperature, skin friction, Nusselt number, and thermal stability criteria are presented and discussed graphically. The results show that the Nusselt number and thermal stability improve with exothermic chemical kinetics, Biot number, and nanoparticles volume fraction, but decrease with increasing viscous dissipation and activation energy.
Article
Mathematics, Applied
Kifle Adula Duguma, Oluwole Daniel Makinde, Lemi Guta Enyadene
Summary: In this study, the impact of Cu-H2O nanoparticles on two-dimensional Casson nanofluid flows past a permeable stretching/shrinking sheet in a porous medium is investigated. Various physical parameters, including slipperiness of surface, suction/injection, viscous dissipation, and convective heating, are considered. The governing equations are transformed into a system of nonlinear ordinary differential equations and solved numerically. The results show that dual solutions exist for the shrinking sheet, with the upper branch solution being stable and realistic, while the lower branch solution is unstable and physically unachievable. The stability of the fluid flow can be enhanced by increasing suction, surface slipperiness, and viscous dissipation parameters. On the other hand, increasing the values of the Casson factor, Cu-H2O nanoparticle volume fraction, porous medium, porous medium inertia, and convective heating parameters improves the blow-up stability of the fluid flow. Moreover, the heat transfer rate increases with the increment of various parameters, such as the Casson factor, porous medium inertia, suction, velocity ratio, and nanoparticle volume fraction, while it decreases with the rise of the slipperiness of the surface and viscous dissipation parameters. The enhancement rate of heat transfer is higher for the shrinking sheet surface when Cu-H2O nanoparticle volume fraction is increased into the Casson fluid.
COMPUTATIONAL AND MATHEMATICAL METHODS
(2023)
Article
Mechanics
Mohamed Boujelbene, Essam R. El-Zahar, Laila F. Seddek, Zia Ullah, O. D. Makinde
Summary: The main objective of this study is to investigate the effects of chemical reaction, reduced gravity, viscous dissipation, and viscosity on oscillatory heat and mass transfer in a gravity-driven reactive flow across an inclined heated plate. The study found that lower reaction rates increase fluid velocity while higher reaction rates decrease fluid velocity; the significant magnitude of oscillatory heat transfer increases with increasing Prandtl number; the amplitude of shearing stress increases at each angle as reduced gravity increases; the largest amplitude in heat and mass transfer occurs with minimum viscosity along the inclined heated plate.
Article
Mathematics, Applied
Berhe Nerea Kahsay, Oluwole D. Makinde
Summary: The aim of this study is to analyze the impact of control strategies on tomato yellow leaf curl virus disease (TYLCVD), including insecticide spray, roguing of infected plants, and protective netting. By using a deterministic model, we calculate the basic reproduction number and investigate the stability of disease-free and endemic equilibria. Our findings suggest that any combination of two out of the three control strategies can significantly reduce disease infectivity, except for using insecticide spray and rouging infected plants together.
JOURNAL OF APPLIED MATHEMATICS
(2023)
Article
Thermodynamics
S. Saravanakumar, A. Eswari, O. D. Makinde, N. Anbazhagan, Gyanendra Prasad Joshi, Woong Cho
Summary: The study derives analytical solutions for temperature distribution, fin effectiveness, and fin efficiency of heat transport equations using the Direct Akbari-Ganji method. It shows that the DAGM is a simple and time-saving technique with excellent validity and promise in engineering heat transfer problems.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Mathematics
Kifle Adula Duguma, Oluwole Daniel Makinde, Lemi Guta Enyadene
Summary: This article investigates the steady two-dimensional boundary layer flow of incompressible viscous Casson nanofluids over a permeable, convectively heated, shrinking/stretching slippery sheet surface. The study is of great significance in terms of both the theoretical modeling of non-Newtonian nanofluid flow with heat transfer in engineering systems and engineering cooling applications. The effects of suction/injection, viscous dissipation, convective heating, and chemical reactions are taken into consideration. Numerical solutions are obtained using the fourth-fifth order Runge-Kutta-Fehlberg method combined with the shooting method. The influence of different parameters on the dimensionless temperature, velocity, concentration, as well as local Nusselt number, skin friction, and local Sherwood number are presented in graphs and tables.
JOURNAL OF MATHEMATICS
(2023)
Article
Engineering, Multidisciplinary
Kifle Adula Duguma, Oluwole Daniel Makinde, Lemi Guta Enyadene
Summary: This paper numerically investigates the flow behavior and thermal performance of nanofluid on a convectively heated cylindrical surface in a porous medium. It is found that TiO2-H2O nanofluid has better thermal performance, and the thermal performance is enhanced with an increase in nanoparticle volume fraction, Casson nanofluid parameter, and Biot number, while it is weakened with a decrease in porous medium permeability.
JOURNAL OF ENGINEERING
(2023)
Article
Engineering, Environmental
S. Das, A. Ali, R. N. Jana, O. D. Makinde
Summary: In this study, a theoretical model is developed to simulate the mixed convective flow of ionic ternary hybrid nanofluids in a vertical non-conducting channel under linearly changing temperature. The results show that the magnetic field and Debye-Huckel parameters have significant impacts on the flow characteristics. Thin electric double layer supports fluid motion through the channel, while the concentration of tri-hybridized nanoparticles in pure water delays the onset of flow instability.
CHEMICAL ENGINEERING JOURNAL ADVANCES
(2022)
Article
Multidisciplinary Sciences
Adetayo Samuel Eegunjobi, Oluwole Daniel Makinde
Summary: A six-compartment epidemiological model was proposed to study the spread of COVID-19 in a community, considering quarantine and recovery. The stability and sensitivity of the model were analyzed, and the basic reproduction number and global stability of the disease-free equilibrium were derived.
JOURNAL OF MATHEMATICAL AND FUNDAMENTAL SCIENCES
(2022)
Article
Mathematics, Applied
Temesgen Duressa Keno, Lemessa Bedjisa Dano, Oluwole Daniel Makinde
Summary: In this paper, a nonlinear deterministic mathematical model for malaria transmission dynamics incorporating climatic variability was presented. The limited region and nonnegativity of the solution were shown, indicating the biological relevance and mathematical well-posedness of the model. The fundamental reproduction number was determined using the next-generation matrix approach, and sensitivity analysis of model parameters was conducted to identify the most influential parameter. The stability of equilibrium locations was illustrated using the Jacobian matrix and Lyapunov function. Furthermore, an optimal control model incorporating three controls was applied, and the optimal and least-cost strategy for minimizing malaria was found to be the combination of treated bed net and treatment.
COMPUTATIONAL AND MATHEMATICAL METHODS
(2022)
Article
Engineering, Multidisciplinary
Padmavathi Thiyagarajan, Senthamilselvi Sathiyamoorthy, Karuppusamy Loganathan, Oluwole Daniel Makinde, Ioannis E. Sarris
Summary: This study investigates the effect of pulsatile flow on the oscillatory motion of incompressible conducting boundary layer mucus fluid flowing through porous media in a channel with elastic walls. The Laplace transform method using the Womersley number is employed to solve the non-linear equations controlling the motion through porous media under the influence of an electromagnetic field. The theoretical pulsatile flow of two liquid phase concurrent fluid streams and its application to mucus and airflow in the airways are examined.
