Article
Mathematics
Obai Younis, Sameh E. Ahmed, Aissa Abderrahmane, Abdulaziz Alenazi, Ahmed M. Hassan
Summary: This article presents a numerical investigation of the magnetohydrodynamics of a mixed convection of nanoenhanced phase change material (NEPCM) within a triangular chamber containing an elliptical heat source. Forced convection is induced by the movement of the upper cavity, while free convection is due to the temperature difference between the heat source and inclined sidewalls. The impacts of various parameters on the heat transfer rate are discussed, including the Reynolds number, inclination angle of the heat source, nanoparticles volume fraction, and the movement directions of the upper wall.
Article
Mechanics
Bhavna Joshi, Aditi Sengupta, Prasannabalaji Sundaram
Summary: A numerical investigation is conducted to examine a compressible fluid flow in a two-dimensional rectangular lid-driven cavity with a vertical temperature gradient. The study focuses on the impact of the aspect ratio on the vorticity dynamics and redistribution. It is found that the vortical structures in specific sub-cells of the rectangular cavity resemble orbital motion and undergo a shift in vorticity transfer as the aspect ratio increases. The flow exhibits chaotic behavior regardless of the aspect ratio, and the dominance of baroclinic vorticity over viscous diffusion suggests its major contribution to rotational flow structures.
Article
Mechanics
Aneela Bibi, Hang Xu
Summary: This article investigates fluid dynamics and heat transfer properties in a trapezoidal enclosure containing a heated cylindrical object. It explores the interaction of multiple physical processes and analyzes the governing equations numerically. The findings demonstrate the various factors influencing the thermal and mass transfer in the enclosure, and the effectiveness of the multiple expression programming (MEP) technique in predicting heat transfer behavior.
Article
Thermodynamics
Rafael da Silveira Borahel, Flavia Schwarz Franceschini Zinani, Luiz Alberto Oliveira Rocha, Elizaldo Domingues dos Santos, Liercio Andre Isoldi, Cesare Biserni
Summary: This study applies the Constructal Design method to analyze the heat transfer performance of a rectangular isothermal block placed inside an adiabatic lid-driven cavity with mixed convection and unstable stratification. The results show that higher heat transfer rates are achieved with larger aspect ratios and taller block shapes.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Physics, Multidisciplinary
Bader Alshuraiaan, Ioan Pop
Summary: The numerical analysis of mixed convection in a lid-driven trapezoidal cavity with a flexible bottom wall filled with a hybrid nanofluid shows that both Reynolds number and volume fraction of nanoparticles significantly affect flow and heat transfer characteristics. The Fluid-Structure-Interface (FSI) model has a profound effect on heat transfer compared to a rigid wall model, and FSI is more feasible to enhance heat transfer compared to the addition of nanoparticles. This study confirms the promising applications of FSI model in enhancing heat transfer characteristics.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Thermodynamics
Obai Younis, Houssem Laidoudi, Aissa Abderrahmane, Abdeldjalil Belazreg, Naef A. A. Qasem, Raad Z. Homod, Yacine Khetib, Muhyaddine Rawa, Ahmed M. Hassan
Summary: This study aims to improve the thermal characteristics of nano-encapsulated phase change materials. By adjusting parameters such as medium permeability, magnetic field strength, orientation of the heated body, and lid movement speed, the thermal performance can be significantly enhanced.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Physics, Applied
M. Rajarathinam, M. Ijaz Khan, N. Nithyadevi, Mohammed Jameel, Kamel Guedri, Ahmed M. Galal
Summary: In this study, heat transfer enhancement using nanofluid in a porous cavity with a solid block is investigated numerically. The results show that the direction of moving walls plays a crucial role on the heat transfer, with the opposite direction yielding the highest rate. Additionally, the length of the solid block also has a significant influence on the heat transfer.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2022)
Article
Thermodynamics
Fatin M. Azizul, Ammar Alsabery, Ishak Hashim, Ali J. Chamkha
Summary: The study analyzes the heatline visualization of mixed convection mechanism and heat transfer in a double lid-driven square cavity with a heated wavy bottom surface. Various factors such as Reynolds number, Richardson number, Prandtl number, and number of oscillations significantly influence the convection mode. The number of oscillations has the most significant impact on streamlines and temperature distributions, while higher Reynolds and Prandtl numbers lead to increased heat transfer efficiency.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Thermodynamics
Pei-Ying Xiong, Aamir Hamid, Kaleem Iqbal, M. Irfan, Masood Khan
Summary: The research examines the convective heat transfer characteristics in a lid-driven triangular cavity with Newtonian MHD fluid, considering various parameters such as Richardson number, Reynolds number, Hartmann number, and cold circular obstacle. The study shows the impact of these parameters on flow kinematics and heat transport processes, highlighting the importance of Reynolds number on convective heat transfer and the dominance of natural convection in systems with high Grashof numbers.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Duna T. Yaseen, Salah M. Salih, Muneer A. Ismael
Summary: The present work investigates the FSI-mixed convection heat transfer in a lid-driven vented cavity. The effects of key factors such as the Richardson number and the Reynolds numbers ratio are studied. Results show that the use of a flexible wall and a specific movement of the top wall is feasible and can significantly enhance heat transfer.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Physics, Multidisciplinary
Z. H. Khan, W. A. Khan, M. Qasim, S. O. Alharbi, M. Hamid, M. Du
Summary: The mixed convection flow of Al2O3-Cu-H2O hybrid nanofluid inside a split lid-driven trapezoidal cavity was studied using numerical simulation. Various flow and heat transfer attributes were analyzed to provide suggestions for improving the cooling mechanism of electronic gadgets and thermal devices.
EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS
(2022)
Article
Thermodynamics
Mohammed Azeez Alomari, Khaled Al-Farhany, Nejla Mahjoub Said, Mujtaba A. Flayyih
Summary: This paper numerically studied the double-diffusive mixed convection of MWCNT/water in a curvilinear cavity with split lid-driven and hot ellipses. The heat and mass transfers were found to be greatly enhanced with the increase of Reynolds number in the case of low Richardson number. However, the effect of Reynolds number becomes unnoticeable with a high Richardson number. Furthermore, Lewis number has a positive effect on heat and mass transfer, and this effect increases with increasing Richardson number.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Abdelkader Filali, Lyes Khezzar, Hamza Semmari, Omar Matar
Summary: The feasibility of using Artificial Neural Network (ANN) to predict thermal behavior due to mixed convection has been established, with new correlations derived for possible engineering design applications. Varying the distance between rectangular blocks has a significant influence on Nusselt number, and the Nusselt number is higher for vertical blocks compared to horizontal blocks. Increasing Reynolds and Grashof numbers magnitudes lead to increased Nusselt number, with specific maximum Nu numbers identified for different block orientations.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Mathematics, Interdisciplinary Applications
Md. Fayz-Al-Asad, Mehmet Yavuz, Md. Nur Alam, Md. Manirul Alam Sarker, Omar Bazighifan
Summary: The effects of combined magneto-convection heat exchange in a driven enclosure with vertical fin were numerically analyzed, revealing that the length of the fin significantly impacts flow structure and heat line sketches. The results show that increasing the fin length can enhance heat removal performance from the enclosure to the adjacent fluid.
FRACTAL AND FRACTIONAL
(2021)
Article
Thermodynamics
Saima Batool, Ghulam Rasool, Nawa Alshammari, Ilyas Khan, Hajra Kaneez, Nawaf Hamadneh
Summary: This article analyzes the heat and mass transfer mechanism of a micropolar nanofluid embedded with buoyancy force and magnetic field. The mathematical model is constructed using mass, energy, and momentum equations, and numerical simulations are performed using the finite volume approach. The study finds that the random mobility of nanoparticles leads to more heat emission inside the enclosure, and mass diffusion is faster for smaller Schmidt numbers. Additionally, a high vortex viscosity parameter has a significant effect when thermophoresis parameter and Reynolds number are significant.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Mathematics, Interdisciplinary Applications
Mustafa Turkyilmazoglu, Mohamed Altanji
Summary: Distinct fractional models of falling object with linear and quadratic air resistive forces are investigated using Caputo fractional derivative. Analytical solutions are obtained for each model, providing a vivid understanding of the object's motion. The contribution of nonlinearity to the fractional models is carefully examined. These fractional models exhibit rich phenomena not found in traditional integer derivative models, but still converge to the traditional model. Short time perturbation and large time asymptotic formulae are derived. The solutions for some fractional models suggest either an increased speed surpassing gravity or asymptotic deceleration to a stop, in contrast to reaching a terminal speed. In the case of quadratic air resistance, power series and asymptotic series solutions are derived under Caputo fractional derivative and infinite base fractional differentiation, respectively. The analysis of ideal falling object motion emphasizes the impact of fractional models and fractional derivative definitions on physical motion, necessitating proper justification.
CHAOS SOLITONS & FRACTALS
(2023)
Article
Mechanics
Mustafa Turkyilmazoglu
Summary: This study investigates the three-dimensional viscous flow caused by the expansion or contraction of a porous slider. The fluid injection for levitating the slider is not constant but changes with time, depending on the slider's location. The unsteady equations of motion are transformed into similarity form using the Reynolds number and dilation parameter. Closed-form expressions are derived for the limiting case of a Reynolds number tending to zero, while numerical methods are used for other cases. The effects of the slider's up and down movement on the flow field, lift, and drag properties are analyzed. It is found that the expansion of the flat slider suppresses lift and drag, while contraction has the opposite effect, which is practically significant for reducing frictional resistance during slider operation.
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
(2023)
Article
Physics, Applied
Muhammad Rahman, H. Waheed, M. Turkyilmazoglu, M. Salman Siddiqui
Summary: This study focuses on Darcy-Brinkman flow across a stretched sheet in a porous medium, considering dissipation and frictional heating. It examines the geometry and equations governing the steady flow of dust particle fluid with slip effect and porous dissipation. Using similarity transformation, a two-dimensional nonlinear partial differential equation is reduced to a sequence of nonlinear ordinary differential equations. Numerical techniques, such as Maple packages and the RK4 method, are employed to solve the system of nonlinear equations and derive the numerical findings.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2023)
Article
Physics, Applied
Muhammad Rahman, Humma Waheed, Mustafa Turkyilmazoglu, M. Salman Siddiqui
Summary: This paper explores the significance of slip situations in porous media and frictional heating on unsteady fluid flow through porous media. Numerical solutions of the differential equation for fluid flow through porous material, including slip effects, are presented. Using a similarity transformation, a nonlinear ordinary differential equation is obtained. The resulting set of nonlinear problems is numerically solved using Maple packages under velocity and thermal slip conditions. Both velocity and temperature increase with an increase in the Brinkman viscosity ratio parameter ?. The effects of the nondimensional parameters on flow velocity and temperature are examined using graphical profiles. The implications of relevant parameters on dimensionless temperature, velocity, local Nusselt number, and skin friction coefficient are shown and explained. The fluctuation of parameters for various flow quantities of interest is investigated and the results are presented in graphs and tables.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2023)
Article
Thermodynamics
Mustafa Turkyilmazoglu
Summary: This paper investigates the mechanism of triggering Benard convection through the absolute instability mode in the presence of a uniform magnetic field perpendicular to the channel walls. The locus of wavenumbers and critical Rayleigh numbers leading to absolute instability onset is determined through a theoretical linear stability approach. The magnetic field has a stabilizing effect on convection, but it becomes ineffective against the absolute instability mechanism beyond a critical location.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2023)
Article
Thermodynamics
Mustafa Turkyilmazoglu, Abuzar Abid Siddiqui
Summary: In this study, the scope is to extend previous work by incorporating the effective viscosity term within the transitional flow in the frame of Brinkman-Darcy-Benard convection. Numerical simulations were performed to investigate the onset of instability within the linear stability analysis, considering the Darcy number, Rayleigh number, and horizontal temperature parameter as essential physical parameters. The results showed that comparatively larger Rayleigh numbers were obtained within the Brinkman's model than the published Darcy model.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Engineering, Chemical
Mustafa Turkyilmazoglu
Summary: This study investigates the onset and formation of Darcy-Bernard convection in a channel filled with fluid-saturated porous medium of finite depth. The Darcy model of porosity is used to identify a new family of solutions controlled by two parameters. These solutions cover most basic states associated with the Darcy law equations. The results reveal the relaxed impermeable wall constraints and provide insight into the triggering/delaying of Darcy-Bernard cells.
TRANSPORT IN POROUS MEDIA
(2023)
Article
Mechanics
Mustafa Turkyilmazoglu
Summary: This paper presents full solutions of the energy and Navier-Stokes equations in the approximate form of Boussinesq. The study focuses on the advective fluid layer flowing within parallel horizontal infinite walls with hydro-thermal slip conditions and the control of momentum/thermal motion by a vertically applied magnetic field. The results show that hydro-thermal slip enhances both velocity and temperature fields, while magnetic field has a weaker suppression effect.
ARCHIVE OF APPLIED MECHANICS
(2023)
Article
Mathematics, Applied
Mustafa Turkyilmazoglu
Summary: In this article, the onset of convection in porous media with through flow is studied based on Darcy formulation. The effects of uniform vertical flow on the thermal instability of convective cells are investigated using three different thermal boundary constraints. The influence of the Peclet number on the stability response of the porous layer is analyzed, and the critical Darcy-Rayleigh numbers and Benard cell wavenumbers are determined numerically. The results show that opposing and assisting through flows have different effects on the stability of convection depending on the thermal conditions of the walls.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2023)
Article
Biology
Mustafa Turkyilmazoglu
Summary: This study models the heat transfer in a bi-layer spherical composite region representing a cancerous tumor embedded in homogeneous muscle tissue using fractional energy equations with additional interface boundary constrictions. The authors obtained exact analytical solutions to the fractional hyperthermia problem by determining the order of fractional derivative through an inverse solution scheme. The distribution of temperature within the tumor-tissue medium is studied and anomalous heat diffusion process is detected. The presented analytical expressions are beneficial for optimizing the operational thermal parameters during hyperthermia treatment of different tumors.
COMPUTERS IN BIOLOGY AND MEDICINE
(2023)
Article
Mechanics
Mustafa Turkyilmazoglu, Faisal Z. Duraihem
Summary: Thermally-driven natural convection in a porous layer is explored theoretically in this work based on Darcy's law. The study focuses on the non-circulating basic cellular flow between two infinitely long horizontal plates and its instability onset. The results show that a circulatory flow and temperature variation along the horizontal axis govern the motion, and the instability can be determined through linear stability analysis and numerical calculations.
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
(2024)
Article
Thermodynamics
Mustafa Turkyilmazoglu, Ioan Pop
Summary: This research investigates the fluid flow and heat transfer development between two cylinders, induced solely by the stretching of the inner cylinder. The mathematical formulation based on mass conservation, Navier-Stokes, and energy equations reveals that the motion is governed by cylinder curvature, Prandtl number, and gap parameters. Numerical simulations show that deformation of the inner cylinder generates axial motion of the fluid above, compensated by radial fluid flow. Analytical solutions are derived for specific cases, demonstrating different flow patterns and the effect of the gap size on momentum and thermal fields. The authors suggest rechecking published numerical results against these exact solutions from a mathematical perspective.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Physics, Applied
Muhammad Rahman, Mustafa Turkyilmazoglu, Muhammad Bilal
Summary: This study examines the shape effects of different nanoparticles (sphere, blade, cylinder, and brick) in an incompressible, unsteady flow of a nanofluid Al2O3 with water H2O as the base fluid over a rotating disk. The magnetic field results are also included. The numerical solution of the Navier-Stokes equation, along with the magnetic field effect and the thermal energy equation, is obtained using the Von Karman transformation and the bvp4c MATLAB solver. The graphical illustrations show the effects of various parameters on the velocity field and temperature profile. The analysis is validated by comparison with previous research. Additionally, the volume fraction parameter and the unsteadiness parameter have significant influences on the velocity profiles near the disk for different nanoparticle shapes, while the magnetic field impact is limited by the suction parameter values.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2023)
Article
Materials Science, Multidisciplinary
Mustafa Turkyilmazoglu, Faisal Z. Duraihem
Summary: This paper provides closed form solutions for fluid flow affected by a uniform magnetic field inside a triangular cross section pipe. The governing equation for pressure gradient induced flow under the magnetic field is reduced to a Helmholtz partial differential equation with Dirichlet boundary conditions. The velocity solution is derived using exponential functions involving the magnetic strength parameter or Hartmann number. The effects of Lorentz force on velocity variations, centerline velocity, volumetric flow rate, and wall shears are analyzed graphically by increasing the magnetic field strength.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Muhammad Rahman, Mustafa Turkyilmazoglu, Kiran Matloob
Summary: This research investigates the thermal performance of a hybrid nanofluid consisting of aluminum oxide and copper nanoparticles on the flow of water and ethylene glycol over a permeable cylinder. Different nanoparticle shapes are considered and the effects of different parameters are analyzed. The study reveals the impact of porosity, Hartmann numbers, inertia factors, Prandtl number, stratification parameter, Eckert number, and Hartmann's number on the velocity field and fluid temperature of the hybrid nanofluid.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
