الفهرس 
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Abstract
Electrostatics is currently found in many major industries related to environment preservation, communications, processing of mineral ore resources, and so on. Among the applications of the electrostatics are the electrostatic separation and electrostatic filtration. During the last two decades, Electrostatic separation is extensively used for the separation of particulate mixtures, especially those results from the waste electric and electronic equipment (WEEE). The recycling of WEEE is very an important issue, as it contains valuable and rare materials. The unique properties of high-voltage electrostatic fields are utilized to collect, direct, deposit, separate, or select very small or lightweight particles. Knowledge of electric fields is necessary in numerous electrostatic applications regarding the design and operation of electrical and electronic equipment. Many configurations’ designs were introduced to obtain the best possible performance of the separation and filtration process.Knowledge of electric fields is necessary to study the performance of the various designs implemented in electrostatic separation and filtration processes. In some gap geometries related to these applications, the electric fields can simply be described analytically in a closed-form solution. In others, the electric field problem is complex. In such cases we must resort to experimental modeling or numerical techniques. One of these numerical techniques is the charge simulation method (CSM). The charge simulation method concept is appropriate for potential and field solutions of open boundary problems. The method computes the simulating charge magnitudes by satisfying the boundary conditions at a chosen number of contour points along the electrodes surfaces. The accuracy of the charge simulation method depends on the magnitudes and the locations of the simulating charges and contour points. Suitable arrangements of fictitious charges and contour points are needed to obtain accurate solutions. -ii- For the sake of an efficient automatic arrangement of the simulating charges, a novel combination of genetic algorithms (GAs) and the charge simulation method (CSM) is introduced. The aim is to improve the computation accuracy of electric fields associated with various gap geometries. In the present research, an algorithm will be developed, automatically, to arrive at optimal arrangement of the simulating charges.The thesis presents the numerical simulation and experimental measurement of both electrostatic and ionized field analysis for dual electrode system intended for electrostatic applications. The dual electrode system consists of an ionizing and non-ionizing electrode have the same voltage and facing a grounded collecting plate. CSM/GA and method of characteristic (MOC) is applied to compute the electrostatic field and the ionized field respectively. The effect of the system parameters on the electrostatic field profile on the ground plate and on the surface of the ionizing wire has been investigated. The measurements of the ionized electric field, current-voltage characteristics and ion current density profiles are carried out using the technique of the linear biased probe. An experimental setup is constructed to model the present electrode arrangement. The computed results compared favorably well with experiments. Also, the thesis concerns with the study of the electrostatic field distribution and negative corona onset voltage of the ionized wire, of a system termed as ”Tri- electrode system”. This system utilizes an extra limiting cylinder located at a certain distance from the surface of the ionized wire in order to provide reliability into controlling the field not only on the ionized wire surface but also along the ground surface. Besides, the research studies the effect of moving the limiting cylinder up and down with respect to the metallic cylinder and the ionized wire on the value of the corona onset voltage of the stressed electrode. Experiments will be carried out for measuring the corona onset voltage, to confirm the validity of the present numerical simulation. Table of BasicElectrostatics is currently found in many major industries related to environment preservation, communications, processing of mineral ore resources, and so on. Among the applications of the electrostatics are the electrostatic separation and electrostatic filtration. During the last two decades, Electrostatic separation is extensively used for the separation of particulate mixtures, especially those results from the waste electric and electronic equipment (WEEE). The recycling of WEEE is very an important issue, as it contains valuable and rare materials. The unique properties of high-voltage electrostatic fields are utilized to collect, direct, deposit, separate, or select very small or lightweight particles. Knowledge of electric fields is necessary in numerous electrostatic applications regarding the design and operation of electrical and electronic equipment. Many configurations’ designs were introduced to obtain the best possible performance of the separation and filtration process.Knowledge of electric fields is necessary to study the performance of the various designs implemented in electrostatic separation and filtration processes. In some gap geometries related to these applications, the electric fields can simply be described analytically in a closed-form solution. In others, the electric field problem is complex. In such cases we must resort to experimental modeling or numerical techniques.One of these numerical techniques is the charge simulation method (CSM). The charge simulation method concept is appropriate for potential and field solutions of open boundary problems. The method computes the simulating charge magnitudes by satisfying the boundary conditions at a chosen number of contour points along the electrodes surfaces. The accuracy of the charge simulation method depends on the magnitudes and the locations of the simulating charges and contour points. Suitable arrangements of fictitious charges and contour points are needed to obtain accurate solutions.For the sake of an efficient automatic arrangement of the simulating charges, a novel combination of genetic algorithms (GAs) and the charge simulation method (CSM) is introduced. The aim is to improve the computation accuracy of electric fields associated with various gap geometries. In the present research, an algorithm will be developed, automatically, to arrive at optimal arrangement of the simulating charges.The thesis presents the numerical simulation and experimental measurement of both electrostatic and ionized field analysis for dual electrode system intended for electrostatic applications. The dual electrode system consists of an ionizing and non-ionizing electrode have the same voltage and facing a grounded collecting plate. CSM/GA and method of characteristic (MOC) is applied to compute the electrostatic field and the ionized field respectively. The effect of the system parameters on the electrostatic field profile on the ground plate and on the surface of the ionizing wire has been investigated. The measurements of the ionized electric field, current-voltage characteristics and ion current density profiles are carried out using the technique of the linear biased probe. An experimental setup is constructed to model the present electrode arrangement. The computed results compared favorably well with experiments.Also, the thesis concerns with the study of the electrostatic field distribution and negative corona onset voltage of the ionized wire, of a system termed as ”Tri- electrode system”. This system utilizes an extra limiting cylinder located at a certain distance from the surface of the ionized wire in order to provide reliability into controlling the field not only on the ionized wire surface but also along the ground surface. Besides, the research studies the effect of moving the limiting cylinder up and down with respect to the metallic cylinder and the ionized wire on the value of the corona onset voltage of the stressed electrode. Experiments will be carried out for measuring the corona onset voltage, to confirm the validity of the present numerical simulation.BasicElectrostatics is currently found in many major industries related to environment preservation, communications, processing of mineral ore resources, and so on. Among the applications of the electrostatics are the electrostatic separation and electrostatic filtration. During the last two decades, Electrostatic separation is extensively used for the separation of particulate mixtures, especially those results from the waste electric and electronic equipment (WEEE). The recycling of WEEE is very an important issue, as it contains valuable and rare materials. The unique properties of high-voltage electrostatic fields are utilized to collect, direct, deposit, separate, or select very small or lightweight particles. Knowledge of electric fields is necessary in numerous electrostatic applications regarding the design and operation of electrical and electronic equipment. Many configurations’ designs were introduced to obtain the best possible performance of the separation and filtration process.Knowledge of electric fields is necessary to study the performance of the various designs implemented in electrostatic separation and filtration processes. In some gap geometries related to these applications, the electric fields can simply be described analytically in a closed-form solution. In others, the electric field problem is complex. In such cases we must resort to experimental modeling or numerical techniques.One of these numerical techniques is the charge simulation method (CSM). The charge simulation method concept is appropriate for potential and field solutions of open boundary problems. The method computes the simulating charge magnitudes by satisfying the boundary conditions at a chosen number of contour points along the electrodes surfaces. The accuracy of the charge simulation method depends on the magnitudes and the locations of the simulating charges and contour points. Suitable arrangements of fictitious charges and contour points are needed to obtain accurate solutions.For the sake of an efficient automatic arrangement of the simulating charges, a novel combination of genetic algorithms (GAs) and the charge simulation method (CSM) is introduced. The aim is to improve the computation accuracy of electric fields associated with various gap geometries. In the present research, an algorithm will be developed, automatically, to arrive at optimal arrangement of the simulating charges.The thesis presents the numerical simulation and experimental measurement of both electrostatic and ionized field analysis for dual electrode system intended for electrostatic applications. The dual electrode system consists of an ionizing and non-ionizing electrode have the same voltage and facing a grounded collecting plate. CSM/GA and method of characteristic (MOC) is applied to compute the electrostatic field and the ionized field respectively. The effect of the system parameters on the electrostatic field profile on the ground plate and on the surface of the ionizing wire has been investigated. The measurements of the ionized electric field, current-voltage characteristics and ion current density profiles are carried out using the technique of the linear biased probe. An experimental setup is constructed to model the present electrode arrangement. The computed results compared favorably well with experiments.Also, the thesis concerns with the study of the electrostatic field distribution and negative corona onset voltage of the ionized wire, of a system termed as ”Tri- electrode system”. This system utilizes an extra limiting cylinder located at a certain distance from the surface of the ionized wire in order to provide reliability into controlling the field not only on the ionized wire surface but also along the ground surface. Besides, the research studies the effect of moving the limiting cylinder up and down with respect to the metallic cylinder and the ionized wire on the value of the corona onset voltage of the stressed electrode. Experiments will be carried out for measuring the corona onset voltage, to confirm the validity of the present numerical simulation.