Efstratios Tzirtzilakis | University of the Peloponnese (original) (raw)

Papers by Efstratios Tzirtzilakis

Research paper thumbnail of Magnetohydrodynamic hybrid nanofluid flow through moving thin needle considering variable viscosity and thermal conductivity

Advances in Mechanical Engineering

In modern science and technology, industrial applications that deal with the problem of continuou... more In modern science and technology, industrial applications that deal with the problem of continuously moving thin needle, surrounded with fluid in sectors like hot rolling, crystal growing, heat extrusion, glass fiber drawing, etc., are rapidly increasing. Such processes involve high temperatures which may affect the fluid properties that is, viscosity and thermal conductivity. So, it’s crucial to understand temperature-dependent fluid properties. Focused on these assumptions, the main objective of the current research work is to investigate how temperature-dependent fluid properties might improve the heat transfer efficiency and performance evolution of hybrid nanofluid in the presence of transverse magnetic field over a moving thin needle. Variable Prandtl number is also introduced to observe flow fluctuation, the effect of adding nanoparticles, and enhancement in heat transmission. The results are obtained for different needle thicknesses, temperature-dependent viscosity, temperat...

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Research paper thumbnail of Convective flow of hybrid nano particles in combination of TiO 2 +CuO/engine oil MoS 2 +ZnO/engine oil and Al 2 O 3 +Cu/engine oil with viscous dissipation over vertically moving surface: Numerical and Galerkin approach

Numerical Heat Transfer, Part A: Applications

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Research paper thumbnail of Biomagnetic flow and radiative heat transfer along an inclined stretched cylinder with magnetic particles and heat source/sink under the influence of magnetic dipole

The biomagnetic fluid (blood) flow with magnetic particles over an inclined stretched cylinder in... more The biomagnetic fluid (blood) flow with magnetic particles over an inclined stretched cylinder in the presence of a magnetic dipole is numerically studied. The effect of thermal radiation and heat source/sink are taken into consideration. For the mathematical formulation of the present problem both magnetization (polarization) and electrical conductivity of blood are taken into consideration. Consequently, the mathematical formulation of Biomagnetic Fluid Dynamics (BFD) is utilized, where both principles of magnetohydrodynamics (MHD) and ferrohydrodynamics (FHD) are taken into account. The governing non-linear partial differential equations are transformed into ordinary differential equations by using a similarity approach. The numerical solution is obtained by employing the bvp4c function in MATLAB R2018b software. The results are presented graphically and discussed for various parameters that are involved in this problem. Considering the electrical conductivity and magnetization o...

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Research paper thumbnail of Biomagnetic (blood) flow under the influence of an applied magnetic field

The flow of biomagnetic fluids in the presence of an applied magnetic field is studied in the pre... more The flow of biomagnetic fluids in the presence of an applied magnetic field is studied in the present thesis. As biomagnetic is defined a fluid that exists in a living creature (biofluid) and its flow is affected by the presence of a magnetic field. The most characteristic biofluid is the blood. The Newtonian viscous laminar incompressible blood flow is considered in the present thesis for the estimation of the parameters appearing in the problems under consideration. An introduction is made at the first chapter of the thesis concerning fundamental concepts of the magnetic fluids such as the magnetization and equilibrium flow. Experimental applications in the biomedicine are also given as well as the mathematical model describing the flow of biological fluids under the influence of an applied magnetic field. In order to investigate the effect of the magnetic field in the next three chapters basic flow problems of biomagnetic fluid (blood) are studied. In the second chapter the flow ...

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Research paper thumbnail of Magnetohydrodynamic and Ferrohydrodynamic Interactions on the Biomagnetic Flow and Heat Transfer Containing Magnetic Particles Along a Stretched Cylinder

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Research paper thumbnail of A two-phase, two-way coupled model of targeted magnetic drug delivery for small Reynolds numbers

Engineering Applications of Computational Fluid Mechanics, 2022

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Research paper thumbnail of Biomagnetic Flow with CoFe2O4 Magnetic Particles through an Unsteady Stretching/Shrinking Cylinder

Magnetochemistry

The study of biomagnetic fluid flow and heat transfer containing magnetic particles through an un... more The study of biomagnetic fluid flow and heat transfer containing magnetic particles through an unsteady stretching/shrinking cylinder was numerically investigated in this manuscript. Biomagnetic fluid namely blood taken as base fluid and CoFe2O4 as magnetic particles. Where blood acts as an electrically conducting fluid along with magnetization/polarization. The main concentration is to study a time-dependent biomagnetic fluid flow with magnetic particles that passed through a two dimensional stretching/shrinking cylinder under the influence of thermal radiation, heat source and partial slip condition which has not been studied yet as far as best knowledge of authors. This model is consistent with the principles of magnetohydrodynamic and ferrohydrodynamic. The flow equations, such as momentum, energy which is described physically by a system of coupled, nonlinear partial differential equation with appropriate boundary conditions and converted into a nonlinear system of ordinary dif...

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Research paper thumbnail of Micromagnetorotation of MHD Micropolar Flows

Symmetry

The studies dealing with micropolar magnetohydrodynamic (MHD) flows usually ignore the micromagne... more The studies dealing with micropolar magnetohydrodynamic (MHD) flows usually ignore the micromagnetorotation (MMR) effect, by assuming that magnetization and magnetic field vectors are parallel. The main objective of the present investigation is to measure the effect of MMR and the possible differences encountered by ignoring it. The MHD planar Couette micropolar flow is solved analytically considering and by ignoring the MMR effect. Subsequently, the influence of MMR on the velocity and microrotation fields as well as skin friction coefficient, is evaluated for various micropolar size and electric effect parameters and Hartmann numbers. It is concluded that depending on the parameters’ combination, as MMR varies, the fluid flow may accelerate, decelerate, or even excite a mixed pattern along the channel height. Thus, the MMR term is a side mechanism, other than the Lorentz force, that transfers or dissipates magnetic energy in the flow direct through microrotation. Acceleration or d...

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Research paper thumbnail of MHD Effects on Blood Flow in a Stenosis

International Journal of Mathematics Trends and Technology

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Research paper thumbnail of Biomagnetic fluid flow in an aneurysm using ferrohydrodynamics principles

Physics of Fluids, 2015

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Research paper thumbnail of Numerical study of biomagnetic fluid flow over a stretching sheet with heat transfer

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Research paper thumbnail of A mathematical model for blood flow in magnetic field

Physics of Fluids, 2005

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Research paper thumbnail of A simple numerical methodology for BFD problems using stream function vorticity formulation

Communications in Numerical Methods in Engineering, 2007

ABSTRACT The fundamental problem of biomagnetic fluid dynamics (BFD) in a 2D rectangular channel ... more ABSTRACT The fundamental problem of biomagnetic fluid dynamics (BFD) in a 2D rectangular channel is numerically studied. The physical problem is described by a coupled, non-linear system of partial differential equations, with appropriate boundary conditions. For the mathematical formulation, the stream function–vorticity formulation is used and the numerical solution is obtained by developing a pseudotransient numerical technique. A boundary condition for the vorticity is also constructed and grid stretching is used. The efficiency of the method is verified by comparison with other results documented in the literature. New results are also obtained for high values of the magnetic number which is the dominant factor for the determination of the flow field in biomagnetic fluid flow problems. Copyright © 2007 John Wiley & Sons, Ltd.

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Research paper thumbnail of Soret and Dufour effects on natural convection heat and mass transfer near a vertical wavy cone in a porous medium with constant wall temperature and concentration

International Communications in Heat and Mass Transfer, 2011

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Research paper thumbnail of Finite element analysis of magnetohydrodynamic effects on blood flow in an aneurysmal geometry

Physics of Fluids, 2014

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Research paper thumbnail of Aligned Magnetic Field and Radiation Effects on Biomagnetic Fluid over an Unsteady Stretching Sheet with Various Slip Conditions

AppliedMath

The aim of the present study is to analyze the effects of aligned magnetic field and radiation on... more The aim of the present study is to analyze the effects of aligned magnetic field and radiation on biomagnetic fluid flow and heat transfer over an unsteady stretching sheet with various slip conditions. The magnetic field is assumed to be sufficiently strong enough to saturate the ferrofluid, and the variation of magnetization is approximated by a linear function of temperature difference. The governing boundary layer equations with boundary conditions are simplified by suitable transformations. Numerical solution is obtained by using the bvp4c function technique in MATLAB software. The numerical results are derived for the velocity, temperature, the skin friction coefficient, and the rate of heat transfer. The evaluated results are compared with analytical study documented in scientific literature. The present investigation illustrates that the fluid velocity is decreased with the increasing values of radiation parameter, magnetic parameter, and ferromagnetic interaction parameter,...

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Research paper thumbnail of Dual solutions for boundary layer flow and heat transfer of biomagnetic fluid over a stretching/shrinking sheet in presence of a magnetic dipole and a prescribed heat flux

International Journal of Applied Electromagnetics and Mechanics, 2020

This paper analyzes the steady boundary layer flow and heat transfer of biomagnetic fluid over a ... more This paper analyzes the steady boundary layer flow and heat transfer of biomagnetic fluid over a stretching/shrinking sheet with prescribed surface heat flux under the influence of a magnetic dipole. The governing equations are transformed into a set of ordinary differential equations (ODEs) by using similarity transformations. Numerical results are obtained using the boundary value problem solver bvp4c of MATLAB. The effects of various physical parameters on the velocity and temperature profiles as well as skin friction coefficient are discussed. The paper shows that dual solutions exist for certain values of stretching/shrinking sheet and suction parameters. Stability analysis is performed to determine which solution is stable and physically valid. Results of the stability analysis depict that the first solution (upper branch) is stable and physically realizable, while the second solution (lower branch) is unstable.

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Research paper thumbnail of Effect of Thermal Radiation on Biomagnetic Fluid Flow and Heat Transfer over an Unsteady Stretching Sheet

Computer Assisted Mechanics and Engineering Sciences, 2021

This study examines the influence of thermal radiation on biomagnetic fluid, namely blood that pa... more This study examines the influence of thermal radiation on biomagnetic fluid, namely blood that passes through a two-dimensional stretching sheet in the presence of magnetic dipole. This analysis is conducted to observe the behavior of blood flow for an unsteady case, which will help in developing new solutions to treat diseases and disorders related to human body. Our model is namely biomagnetic fluid dynamics (BFD), which is consistent with two principles: ferrohydrodynamic (FHD) and magnetohydrodynamic (MHD), where blood is treated as electrically conductive. It is assumed that the implemented magnetic field is sufficiently strong to saturate the ferrofluid, and the variation of magnetization with temperature may be approximated with the aid of a function of temperature distinction. The governing partial differential equations (PDEs) converted into ordinary differential equations (ODEs) using similarity transformation and numerical results are thus obtained by using the bvp4c func...

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Research paper thumbnail of Numerical Solution of the Boussinesq Equation Using Spectral Methods and Stability of Solitary Wave Propagation

We study numerically the propagation and stability properties of solitary waves (solitons) of the... more We study numerically the propagation and stability properties of solitary waves (solitons) of the Boussinesq equation in one space dimension, using a combination of finite differences in time and spectral methods in space. Our schemes follow very accurately these solutions, which are given by simple closed formulas and are known to be stable under small perturbations, for small enough velocities. Studying the interaction of two such solitons, we determine in the velocity parameter plane a sharp curve beyond which they become unstable. This is achieved by applying a precise criterion, which predicts when the observed amplitude growth of the waves is caused by a dynamical instability rather than the accumulation of numerical errors.

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Research paper thumbnail of Biomagnetic Fluid Flow and Heat Transfer Study of Blood with Gold Nanoparticles over a Stretching Sheet in the Presence of Magnetic Dipole

Fluids

In this study, we examined the biomagnetic flow and heat transfer of an incompressible electrical... more In this study, we examined the biomagnetic flow and heat transfer of an incompressible electrically conductive fluid (blood) containing gold nanoparticles over a stretching sheet in the presence of a magnetic dipole. In this problem, both principles of magnetohydrodynamics (MHD) and ferrohydrodynamics (FHD) were adopted. Biot number and slip and suction parameters were taken into consideration. The nonlinear partial differential equations were transformed into ordinary differential equations by implementing similarity transformations. The numerical solution was attained by utilizing the bvp4c function technique in MATLAB R2018b software. The influence of pertinent parameters involved in this model, such as ferromagnetic parameter, magnetic field parameter, Grashof number, Eckert number, suction parameter, Biot number, slip parameter and Prandtl number, on the dimensionless velocity, temperature, skin friction and heat transfer rate were analyzed numerically and are represented graph...

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Research paper thumbnail of Magnetohydrodynamic hybrid nanofluid flow through moving thin needle considering variable viscosity and thermal conductivity

Advances in Mechanical Engineering

In modern science and technology, industrial applications that deal with the problem of continuou... more In modern science and technology, industrial applications that deal with the problem of continuously moving thin needle, surrounded with fluid in sectors like hot rolling, crystal growing, heat extrusion, glass fiber drawing, etc., are rapidly increasing. Such processes involve high temperatures which may affect the fluid properties that is, viscosity and thermal conductivity. So, it’s crucial to understand temperature-dependent fluid properties. Focused on these assumptions, the main objective of the current research work is to investigate how temperature-dependent fluid properties might improve the heat transfer efficiency and performance evolution of hybrid nanofluid in the presence of transverse magnetic field over a moving thin needle. Variable Prandtl number is also introduced to observe flow fluctuation, the effect of adding nanoparticles, and enhancement in heat transmission. The results are obtained for different needle thicknesses, temperature-dependent viscosity, temperat...

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Research paper thumbnail of Convective flow of hybrid nano particles in combination of TiO 2 +CuO/engine oil MoS 2 +ZnO/engine oil and Al 2 O 3 +Cu/engine oil with viscous dissipation over vertically moving surface: Numerical and Galerkin approach

Numerical Heat Transfer, Part A: Applications

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Research paper thumbnail of Biomagnetic flow and radiative heat transfer along an inclined stretched cylinder with magnetic particles and heat source/sink under the influence of magnetic dipole

The biomagnetic fluid (blood) flow with magnetic particles over an inclined stretched cylinder in... more The biomagnetic fluid (blood) flow with magnetic particles over an inclined stretched cylinder in the presence of a magnetic dipole is numerically studied. The effect of thermal radiation and heat source/sink are taken into consideration. For the mathematical formulation of the present problem both magnetization (polarization) and electrical conductivity of blood are taken into consideration. Consequently, the mathematical formulation of Biomagnetic Fluid Dynamics (BFD) is utilized, where both principles of magnetohydrodynamics (MHD) and ferrohydrodynamics (FHD) are taken into account. The governing non-linear partial differential equations are transformed into ordinary differential equations by using a similarity approach. The numerical solution is obtained by employing the bvp4c function in MATLAB R2018b software. The results are presented graphically and discussed for various parameters that are involved in this problem. Considering the electrical conductivity and magnetization o...

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Research paper thumbnail of Biomagnetic (blood) flow under the influence of an applied magnetic field

The flow of biomagnetic fluids in the presence of an applied magnetic field is studied in the pre... more The flow of biomagnetic fluids in the presence of an applied magnetic field is studied in the present thesis. As biomagnetic is defined a fluid that exists in a living creature (biofluid) and its flow is affected by the presence of a magnetic field. The most characteristic biofluid is the blood. The Newtonian viscous laminar incompressible blood flow is considered in the present thesis for the estimation of the parameters appearing in the problems under consideration. An introduction is made at the first chapter of the thesis concerning fundamental concepts of the magnetic fluids such as the magnetization and equilibrium flow. Experimental applications in the biomedicine are also given as well as the mathematical model describing the flow of biological fluids under the influence of an applied magnetic field. In order to investigate the effect of the magnetic field in the next three chapters basic flow problems of biomagnetic fluid (blood) are studied. In the second chapter the flow ...

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Research paper thumbnail of Magnetohydrodynamic and Ferrohydrodynamic Interactions on the Biomagnetic Flow and Heat Transfer Containing Magnetic Particles Along a Stretched Cylinder

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Research paper thumbnail of A two-phase, two-way coupled model of targeted magnetic drug delivery for small Reynolds numbers

Engineering Applications of Computational Fluid Mechanics, 2022

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Research paper thumbnail of Biomagnetic Flow with CoFe2O4 Magnetic Particles through an Unsteady Stretching/Shrinking Cylinder

Magnetochemistry

The study of biomagnetic fluid flow and heat transfer containing magnetic particles through an un... more The study of biomagnetic fluid flow and heat transfer containing magnetic particles through an unsteady stretching/shrinking cylinder was numerically investigated in this manuscript. Biomagnetic fluid namely blood taken as base fluid and CoFe2O4 as magnetic particles. Where blood acts as an electrically conducting fluid along with magnetization/polarization. The main concentration is to study a time-dependent biomagnetic fluid flow with magnetic particles that passed through a two dimensional stretching/shrinking cylinder under the influence of thermal radiation, heat source and partial slip condition which has not been studied yet as far as best knowledge of authors. This model is consistent with the principles of magnetohydrodynamic and ferrohydrodynamic. The flow equations, such as momentum, energy which is described physically by a system of coupled, nonlinear partial differential equation with appropriate boundary conditions and converted into a nonlinear system of ordinary dif...

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Research paper thumbnail of Micromagnetorotation of MHD Micropolar Flows

Symmetry

The studies dealing with micropolar magnetohydrodynamic (MHD) flows usually ignore the micromagne... more The studies dealing with micropolar magnetohydrodynamic (MHD) flows usually ignore the micromagnetorotation (MMR) effect, by assuming that magnetization and magnetic field vectors are parallel. The main objective of the present investigation is to measure the effect of MMR and the possible differences encountered by ignoring it. The MHD planar Couette micropolar flow is solved analytically considering and by ignoring the MMR effect. Subsequently, the influence of MMR on the velocity and microrotation fields as well as skin friction coefficient, is evaluated for various micropolar size and electric effect parameters and Hartmann numbers. It is concluded that depending on the parameters’ combination, as MMR varies, the fluid flow may accelerate, decelerate, or even excite a mixed pattern along the channel height. Thus, the MMR term is a side mechanism, other than the Lorentz force, that transfers or dissipates magnetic energy in the flow direct through microrotation. Acceleration or d...

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Research paper thumbnail of MHD Effects on Blood Flow in a Stenosis

International Journal of Mathematics Trends and Technology

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Research paper thumbnail of Biomagnetic fluid flow in an aneurysm using ferrohydrodynamics principles

Physics of Fluids, 2015

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Research paper thumbnail of Numerical study of biomagnetic fluid flow over a stretching sheet with heat transfer

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A mathematical model for blood flow in magnetic field

Physics of Fluids, 2005

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A simple numerical methodology for BFD problems using stream function vorticity formulation

Communications in Numerical Methods in Engineering, 2007

ABSTRACT The fundamental problem of biomagnetic fluid dynamics (BFD) in a 2D rectangular channel ... more ABSTRACT The fundamental problem of biomagnetic fluid dynamics (BFD) in a 2D rectangular channel is numerically studied. The physical problem is described by a coupled, non-linear system of partial differential equations, with appropriate boundary conditions. For the mathematical formulation, the stream function–vorticity formulation is used and the numerical solution is obtained by developing a pseudotransient numerical technique. A boundary condition for the vorticity is also constructed and grid stretching is used. The efficiency of the method is verified by comparison with other results documented in the literature. New results are also obtained for high values of the magnetic number which is the dominant factor for the determination of the flow field in biomagnetic fluid flow problems. Copyright © 2007 John Wiley & Sons, Ltd.

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Research paper thumbnail of Soret and Dufour effects on natural convection heat and mass transfer near a vertical wavy cone in a porous medium with constant wall temperature and concentration

International Communications in Heat and Mass Transfer, 2011

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Finite element analysis of magnetohydrodynamic effects on blood flow in an aneurysmal geometry

Physics of Fluids, 2014

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Research paper thumbnail of Aligned Magnetic Field and Radiation Effects on Biomagnetic Fluid over an Unsteady Stretching Sheet with Various Slip Conditions

AppliedMath

The aim of the present study is to analyze the effects of aligned magnetic field and radiation on... more The aim of the present study is to analyze the effects of aligned magnetic field and radiation on biomagnetic fluid flow and heat transfer over an unsteady stretching sheet with various slip conditions. The magnetic field is assumed to be sufficiently strong enough to saturate the ferrofluid, and the variation of magnetization is approximated by a linear function of temperature difference. The governing boundary layer equations with boundary conditions are simplified by suitable transformations. Numerical solution is obtained by using the bvp4c function technique in MATLAB software. The numerical results are derived for the velocity, temperature, the skin friction coefficient, and the rate of heat transfer. The evaluated results are compared with analytical study documented in scientific literature. The present investigation illustrates that the fluid velocity is decreased with the increasing values of radiation parameter, magnetic parameter, and ferromagnetic interaction parameter,...

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Research paper thumbnail of Dual solutions for boundary layer flow and heat transfer of biomagnetic fluid over a stretching/shrinking sheet in presence of a magnetic dipole and a prescribed heat flux

International Journal of Applied Electromagnetics and Mechanics, 2020

This paper analyzes the steady boundary layer flow and heat transfer of biomagnetic fluid over a ... more This paper analyzes the steady boundary layer flow and heat transfer of biomagnetic fluid over a stretching/shrinking sheet with prescribed surface heat flux under the influence of a magnetic dipole. The governing equations are transformed into a set of ordinary differential equations (ODEs) by using similarity transformations. Numerical results are obtained using the boundary value problem solver bvp4c of MATLAB. The effects of various physical parameters on the velocity and temperature profiles as well as skin friction coefficient are discussed. The paper shows that dual solutions exist for certain values of stretching/shrinking sheet and suction parameters. Stability analysis is performed to determine which solution is stable and physically valid. Results of the stability analysis depict that the first solution (upper branch) is stable and physically realizable, while the second solution (lower branch) is unstable.

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Research paper thumbnail of Effect of Thermal Radiation on Biomagnetic Fluid Flow and Heat Transfer over an Unsteady Stretching Sheet

Computer Assisted Mechanics and Engineering Sciences, 2021

This study examines the influence of thermal radiation on biomagnetic fluid, namely blood that pa... more This study examines the influence of thermal radiation on biomagnetic fluid, namely blood that passes through a two-dimensional stretching sheet in the presence of magnetic dipole. This analysis is conducted to observe the behavior of blood flow for an unsteady case, which will help in developing new solutions to treat diseases and disorders related to human body. Our model is namely biomagnetic fluid dynamics (BFD), which is consistent with two principles: ferrohydrodynamic (FHD) and magnetohydrodynamic (MHD), where blood is treated as electrically conductive. It is assumed that the implemented magnetic field is sufficiently strong to saturate the ferrofluid, and the variation of magnetization with temperature may be approximated with the aid of a function of temperature distinction. The governing partial differential equations (PDEs) converted into ordinary differential equations (ODEs) using similarity transformation and numerical results are thus obtained by using the bvp4c func...

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Research paper thumbnail of Numerical Solution of the Boussinesq Equation Using Spectral Methods and Stability of Solitary Wave Propagation

We study numerically the propagation and stability properties of solitary waves (solitons) of the... more We study numerically the propagation and stability properties of solitary waves (solitons) of the Boussinesq equation in one space dimension, using a combination of finite differences in time and spectral methods in space. Our schemes follow very accurately these solutions, which are given by simple closed formulas and are known to be stable under small perturbations, for small enough velocities. Studying the interaction of two such solitons, we determine in the velocity parameter plane a sharp curve beyond which they become unstable. This is achieved by applying a precise criterion, which predicts when the observed amplitude growth of the waves is caused by a dynamical instability rather than the accumulation of numerical errors.

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Research paper thumbnail of Biomagnetic Fluid Flow and Heat Transfer Study of Blood with Gold Nanoparticles over a Stretching Sheet in the Presence of Magnetic Dipole

Fluids

In this study, we examined the biomagnetic flow and heat transfer of an incompressible electrical... more In this study, we examined the biomagnetic flow and heat transfer of an incompressible electrically conductive fluid (blood) containing gold nanoparticles over a stretching sheet in the presence of a magnetic dipole. In this problem, both principles of magnetohydrodynamics (MHD) and ferrohydrodynamics (FHD) were adopted. Biot number and slip and suction parameters were taken into consideration. The nonlinear partial differential equations were transformed into ordinary differential equations by implementing similarity transformations. The numerical solution was attained by utilizing the bvp4c function technique in MATLAB R2018b software. The influence of pertinent parameters involved in this model, such as ferromagnetic parameter, magnetic field parameter, Grashof number, Eckert number, suction parameter, Biot number, slip parameter and Prandtl number, on the dimensionless velocity, temperature, skin friction and heat transfer rate were analyzed numerically and are represented graph...

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