Steady, laminar, magneto-convection of a liquid metal with temperature-dependent thermal and elec... more Steady, laminar, magneto-convection of a liquid metal with temperature-dependent thermal and electrical properties in a square enclosure heated from left and cooled from right is numerically investigated. The governing equations including mass, momentum, and energy equations are applied to the enclosure. These governing equations are discretized by the control volume method with Hybrid scheme and solved numerically by SIMPLER algorithm
Abstract The effect of temperature-dependent thermal conductivity on the magneto-convection in a ... more Abstract The effect of temperature-dependent thermal conductivity on the magneto-convection in a low Prandtl number liquid is investigated numerically. The liquid is contained in a closed square cavity with isothermal vertical walls kept at different temperatures. The ...
Abstract Steady, laminar, natural-convection flow in the presence of a magnetic field in a cavity... more Abstract Steady, laminar, natural-convection flow in the presence of a magnetic field in a cavity heated from left and cooled from right is considered. In our formulation of governing equations, mass, momentum, energy and induction equations are applied to the cavity. To ...
International Communications in Heat and Mass Transfer, 2010
Recently application of nano-technology in medicine and cancer therapy has generated a lot of int... more Recently application of nano-technology in medicine and cancer therapy has generated a lot of interest in thermal properties of bio-nanofluid such as blood with nanoparticles suspension. In this study effective thermal conductivity of blood with suspension of Al2O3 nanoparticles as a bio-nanofluid was studied. A two-step model based on parallel mixture rule, thermal resistance concept and Maxwell-type equations was developed.
The interaction of moving conducting fluids with electric and magnetic fields provides the magnet... more The interaction of moving conducting fluids with electric and magnetic fields provides the magnetohydrodynamic (MHD) phenomenon. Based on this principle, MHD pump uses the "Lorentz Force" to move fluid. The railgun channel is one important segment in an electromagnetic launcher. As known one of the possible ways to increase the EML efficiency is to segment the working channel. For this purpose MHD flow study is necessary. It is required to have the knowledge of the flow field to design a magnetohydrodynamic pump. The purpose of this study is to analytically investigate the effect of Hartman number as well as magnetic and electrical angular frequency on the velocity distribution in a magnetohydrodynamic pump. To solve the governing differential equation, initially a velocity profile is guessed and then the Navier-Stokes is solved. Results show that as Hartman number approaches zero the velocity profile becomes similar to that of fully developed flow in a pipe. Furthermore, for frequency over 10pi rad/sec the flow can be treated as steady state. However below angular frequency of 10pi rad/sec velocity oscillates constantly. Therefore flow can not be treated as steady state.
In an electromagnetic launcher (EML), the magnetic field creates a dynamic force that moves the a... more In an electromagnetic launcher (EML), the magnetic field creates a dynamic force that moves the armature forward. During launch, electrical current creates high body forces and temperature distribution in the rails and the armature. As a result, the rails and armature experience high amplitude stress and strain, which damage the rails and the armature and reduce their life span. The purpose of this paper is to investigate the effect of body force, as well as the temperature distribution on the displacement of the rails in an EML. In this paper, the physical and geometrical properties of the rails are constant in location. In our formulation of governing nonlinear differential equations, Maxwell, energy, and Navier equations are applied to the rails under dynamic loading. To solve the nonlinear governing differential equations, a finite difference base code is developed and utilized. It is shown that the maximum volumetric forces take place where the highest magnetic field gradient occurs. In addition, the maximum magnetic force is accumulated at the trailing edge of the armature and portions of the rail interior. The thermal stress distribution follows the same trend as the displacement due to the temperature behavior of the rails.
The purpose of this study is to present a 2D transient numerical model to predict the dynamic beh... more The purpose of this study is to present a 2D transient numerical model to predict the dynamic behavior of a tubular SOFC. In this model, the transient conservation equations (momentum, species and energy equations) are solved numerically and electrical and electrochemical outputs are calculated with an equivalent electrical circuit for the cell. The developed model determines the cell electrical and
The purpose of this study is to investigate the effect of armature design on the thermal and magn... more The purpose of this study is to investigate the effect of armature design on the thermal and magnetic induction distribution of the rails and the armature in an electromagnetic launcher. In our formulation of governing, non-linear differential equations, Maxwell equations coupled with energy ...
Steady, laminar, magneto-convection of a liquid metal with temperature-dependent thermal and elec... more Steady, laminar, magneto-convection of a liquid metal with temperature-dependent thermal and electrical properties in a square enclosure heated from left and cooled from right is numerically investigated. The governing equations including mass, momentum, and energy equations are applied to the enclosure. These governing equations are discretized by the control volume method with Hybrid scheme and solved numerically by SIMPLER algorithm
Abstract The effect of temperature-dependent thermal conductivity on the magneto-convection in a ... more Abstract The effect of temperature-dependent thermal conductivity on the magneto-convection in a low Prandtl number liquid is investigated numerically. The liquid is contained in a closed square cavity with isothermal vertical walls kept at different temperatures. The ...
Abstract Steady, laminar, natural-convection flow in the presence of a magnetic field in a cavity... more Abstract Steady, laminar, natural-convection flow in the presence of a magnetic field in a cavity heated from left and cooled from right is considered. In our formulation of governing equations, mass, momentum, energy and induction equations are applied to the cavity. To ...
International Communications in Heat and Mass Transfer, 2010
Recently application of nano-technology in medicine and cancer therapy has generated a lot of int... more Recently application of nano-technology in medicine and cancer therapy has generated a lot of interest in thermal properties of bio-nanofluid such as blood with nanoparticles suspension. In this study effective thermal conductivity of blood with suspension of Al2O3 nanoparticles as a bio-nanofluid was studied. A two-step model based on parallel mixture rule, thermal resistance concept and Maxwell-type equations was developed.
The interaction of moving conducting fluids with electric and magnetic fields provides the magnet... more The interaction of moving conducting fluids with electric and magnetic fields provides the magnetohydrodynamic (MHD) phenomenon. Based on this principle, MHD pump uses the "Lorentz Force" to move fluid. The railgun channel is one important segment in an electromagnetic launcher. As known one of the possible ways to increase the EML efficiency is to segment the working channel. For this purpose MHD flow study is necessary. It is required to have the knowledge of the flow field to design a magnetohydrodynamic pump. The purpose of this study is to analytically investigate the effect of Hartman number as well as magnetic and electrical angular frequency on the velocity distribution in a magnetohydrodynamic pump. To solve the governing differential equation, initially a velocity profile is guessed and then the Navier-Stokes is solved. Results show that as Hartman number approaches zero the velocity profile becomes similar to that of fully developed flow in a pipe. Furthermore, for frequency over 10pi rad/sec the flow can be treated as steady state. However below angular frequency of 10pi rad/sec velocity oscillates constantly. Therefore flow can not be treated as steady state.
In an electromagnetic launcher (EML), the magnetic field creates a dynamic force that moves the a... more In an electromagnetic launcher (EML), the magnetic field creates a dynamic force that moves the armature forward. During launch, electrical current creates high body forces and temperature distribution in the rails and the armature. As a result, the rails and armature experience high amplitude stress and strain, which damage the rails and the armature and reduce their life span. The purpose of this paper is to investigate the effect of body force, as well as the temperature distribution on the displacement of the rails in an EML. In this paper, the physical and geometrical properties of the rails are constant in location. In our formulation of governing nonlinear differential equations, Maxwell, energy, and Navier equations are applied to the rails under dynamic loading. To solve the nonlinear governing differential equations, a finite difference base code is developed and utilized. It is shown that the maximum volumetric forces take place where the highest magnetic field gradient occurs. In addition, the maximum magnetic force is accumulated at the trailing edge of the armature and portions of the rail interior. The thermal stress distribution follows the same trend as the displacement due to the temperature behavior of the rails.
The purpose of this study is to present a 2D transient numerical model to predict the dynamic beh... more The purpose of this study is to present a 2D transient numerical model to predict the dynamic behavior of a tubular SOFC. In this model, the transient conservation equations (momentum, species and energy equations) are solved numerically and electrical and electrochemical outputs are calculated with an equivalent electrical circuit for the cell. The developed model determines the cell electrical and
The purpose of this study is to investigate the effect of armature design on the thermal and magn... more The purpose of this study is to investigate the effect of armature design on the thermal and magnetic induction distribution of the rails and the armature in an electromagnetic launcher. In our formulation of governing, non-linear differential equations, Maxwell equations coupled with energy ...
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