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Ion Slip Effect on the Flow Due to a Rotating Disk With Heat Transfer
Hazem Ali Attia 대한기계학회 2007 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.21 No.4
The steady hydromagnetic flow due to a rotating disk is studied with heat transfer considering the ion slip. The governing equations are solved numerically using finite differences. The results show that the inclusion of the ion slip has important effects on the velocity distribution as well as the heat transfer.
Dynamic Modelling of Planar Mechanisms Using Point Coordinates
Attia, Hazem-Ali The Korean Society of Mechanical Engineers 2003 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.17 No.12
In the present study, the dynamic modelling of planar mechanisms that consist of a system of rigid bodies is carried out using point coordiantes. The system of rigid bodies is replaced by a dynamically equivalent constrained system of particles. Then for the resulting equivalent system of particles, the concepts of linear and angular momentums are used to generate the equations of motion without either introducing any rotational coordinates or distributing the external forces and force couples over the particles. For the open loop case, the equations of motion are generated recursively along the open chains. For the closed loop case, the system is transformed to open loops by cutting suitable kinematic joints with the addition of cut-joints kinematic constraints. An example of a multi-branch closed-loop system is chosen to demonstrate the generality and simplicity of the proposed method.
Unsteady Couette Flow with Heat Transfer in a Viscoelastic Fluid Considering the Ion Slip
Hazem Ali Attia 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.3
The unsteady Couette flow of an electrically conducting incompressible non-Newtonian viscoelastic fluid between two parallel horizontal non-conducting porous plates is studied with heat transfer, taking the ion slip into consideration. A sudden uniform and constant pressure gradient, an external uniform magnetic field that is perpendicular to the plates, and uniform suction and injection through the surfaces of the plates are applied. The two plates are kept at different, but constant, temperatures while the Joule and viscous dissipations are taken into consideration. Numerical solutions for the governing momentum and energy equations are obtained using finite-difference approximations. The effect of the magnetic field, the Hall term, the ion slip, the parameter describing the non-Newtonian behavior, and the velocity of suction and injection on both the velocity and the temperature distributions is examined.
Kinematic Analysis of the Multi-Link Five-Point Suspension System in Point Coordinates
Hazem Ali Attia 대한기계학회 2003 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.17 No.8
In this paper. a numerical algorithm for the kinematic analysis of a multi-link five-point suspension system is presented. The kinematic analysis is carried out in terms of the rectangular Cartesian coordinates of some defined points in the links and at the joints. Geometric constraints are introduced to fix the relative positions between the points belonging to the same rigid body. Position. velocity and acceleration analyses are carried out. The presented formulation in terms of this system of coordinates is simple and involves only elementary mathematics. The results of the kinematic analysis are presented and discussed.
The Effect of Ion Slip on the Flow of Reiner-Rivlin Fluid Due a Rotating Disk with Heat Transfer
Hazem Ali Attia 대한기계학회 2007 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.21 No.1
The magnetohydrodynamic rotating disk flow and heat transfer of a non-Newtonian Reiner-Rivlin conducting fluid is studied considering the ion slip. The governing nonlinear equations are solved numerically using finite differences. The results show that the inclusion of the ion slip and the non-Newtonian fluid characteristics have interesting effects on the velocity and temperature distributions.
Ion Slip Effect on the Flow Due to a Rotating Disk with Heat Transfer
Hazem Ali Attia 대한기계학회 2006 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.20 No.12
The steady hydromagnetic flow due to a rotating disk is studied with heat transfer considering the ion slip. The governing equations are solved numerically using finite differences. The results show that the inclusion of the ion slip has important effects on the velocity distribution as well as the heat transfer.
Hazem Ali Attia 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.1
The steady flow and heat transfer of a conducting fluid due to the rotation of an infinite, nonconducting, porous disk in the presence of an axial, uniform, steady magnetic field are studied considering the ion slip. A uniform injection or suction is applied through the surface of the disk. The relevant equations are solved numerically by using finite differences, and the solution shows that the inclusion of the ion slip and the injection or suction through the surface of the disk give some interesting results. It is of interest to find that the velocity components reverse direction for certain values of the magnetic field and the Hall and the ion-slip parameters. Also, the influence of the Hall and ion-slip parameters on the velocity components is more pronounced in the injection than in the suction case. These results show how the flow can be controlled by using these physical parameters.
Ion Slip Effect on the Flow Due to a Rotating Disk with Heat Transfer
Attia Hazem Ali The Korean Society of Mechanical Engineers 2006 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.20 No.12
The steady hydromagnetic flow due to a rotating disk is studied with heat transfer considering the ion slip. The governing equations are solved numerically using finite differences. The results show that the inclusion of the ion slip has important effects on the velocity distribution as well as the heat transfer.
Dynamics of the Macpherson Strut Motor-Vehicle Suspension System in Point and Joint Coordinates
Attia, Hazem-Ali The Korean Society of Mechanical Engineers 2003 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.17 No.9
In this paper the dynamic analysis of the Macpherson strut motor-vehicle suspension system is presented. The equations of motion are formulated using a two-step transformation. Initially, the equations of motion are derived for a dynamically equivalent constrained system of particles that replaces the rigid bodies by applying Newton's second law The equations of motion are then transformed to a reduced set in terms of the relative joint variables. Use of both Cartesian and joint variables produces an efficient set of equations without loss of generality For open chains, this process automatically eliminates all of the non-working constraint forces and leads to an efficient solution and integration of the equations of motion. For closed loops, suitable joints should be cut and few cut-joints constraint equations should be included for each closed chain. The chosen suspension includes open and closed loops with quarter-car model. The results of the simulation indicate the simplicity and generality of the dynamic formulation.