Y. Rihan - Academia.edu (original) (raw)
Papers by Y. Rihan
An electrostatic micromachined pump is designed and simulated. The designed micropump has the adv... more An electrostatic micromachined pump is designed and simulated. The designed micropump has the advantages of flow rate controllability, self-priming, small chip size, and low power consumption. The designed micropump is simulated by the Runge-Kutta method. The flow rate of the designed micropump is considered 10 µl/min which is quite suitable for drug delivery applications, such as chemotherapy. The simulation results for the first membrane deflection with different materials and at pulsed applied voltage is introduced.
The electric power grid is a complex interconnected system. The state estimation with phasor meas... more The electric power grid is a complex interconnected system. The state estimation with phasor measurement units (PMU) are powerful technique for system monitoring and control. The results of state estimation are more accurate, when using phasor measurement units in the complex power systems. The state estimation problem in electrical power system consists of many basic operations, one of them, detection and identification of bad measurement. In this paper a proposed technique of state estimation using phasor measurement units is discussed and implemented. Furthermore, it is also shown that bad data in any of the measurements can be detected and identified provided certain redundancy requirements are met. The technique is applied to IEEE 30 nodes system. Test results show the effectiveness of the proposed method to improve the quality of the state estimator solution, and led to reliable and trustable system when feeding the nuclear installations .
An electrostatic micromachined pump is designed and simulated. The designed micropump has the adv... more An electrostatic micromachined pump is designed and simulated. The designed micropump has the advantages of flow rate controllability, self-priming, small chip size, and low power consumption. The designed micropump is simulated by the Runge-Kutta method. The flow rate of the designed micropump is considered 10 µl/min which is quite suitable for drug delivery applications, such as chemotherapy. The simulation results for the first membrane deflection with different materials and at pulsed applied voltage is introduced.
Engineering Computations, 2002
ABSTRACT Large eddy simulation and direct numerical simulation have become one of the best method... more ABSTRACT Large eddy simulation and direct numerical simulation have become one of the best methods to predict the turbulent unsteady flows. But approaches require powerful computers and significant computer time. RANS-Reynolds Averaged Navier-Stokes-with turbulence models which saves the time and money. There are many turbulence models, such as k-epsilon, k-omega, Spalart-Allmaras, zero equation, and so on to serve the simulating of flow past or in 2-D geometries. In fact, many different publications with good results showed that k-epsilon still the best one of them, this is from the point of view of comparison with experimental data. In the present work, the numerical results were obtained using a two dimensional finite-volume code which solves the governing equations in a vertical plane with k-� as a suitable turbulence model for the studied two-dimensional case. The pressure field is obtained with the well-known simple algorithm. The hybrid scheme was employed for discretization of convection in all conservation equations. The considered case study is flow and heat transfer through sudden contraction. In spite of such simple form with complex flow, different applications can be found in practice such as piping systems, cooling passages of modern gas turbine blades and in the turbulent promoters of gas cooled reactors.
A mathematical model of condensation of mixtures of steam and noncondensable gas flowing downward... more A mathematical model of condensation of mixtures of steam and noncondensable gas flowing downward an isothermal vertical tube is investigated. A methodology for modeling condensation, based on the stagnant film theory, and compatible with the reviewed ...
The 7th International Conference on Information Technology, May 12, 2015
Numerical simulation of coolant flow inside the rod bundle of a nuclear reactor is of great engin... more Numerical simulation of coolant flow inside the rod bundle of a nuclear reactor is of great engineering interest. In the design of innovative core solutions, such as high conversion tight lattice cores for Light Water Reactors (LWR), as flow distribution cannot be calculated with exact analytical methods, numerical modeling plays a vital role. A computational fluid dynamics (CFD) methodology is proposed to investigate the thermal-hydraulic characteristics in a rod bundle. Using a three dimensional numerical solution, the characteristics of an isotropic k-epsilon turbulence model for use in modeling turbulent interchange mixing within rod arrays was investigated. The model used to predict the radial component of turbulent eddy viscosity and wall shear. Existing data of Nusselt number distributions in the axial direction obtained by different authors have been employed to validate the CFD model.
A numerical model is developed, by using finite volume method to solve the two-dimensional unstea... more A numerical model is developed, by using finite volume method to solve the two-dimensional unsteady flow and energy equations for simulating the flow and heat transfer with solidification in round billet continuous casting. The strongly coupled set of partial differential equations representing the conservation of mass, momentum and energy are employed. In addition of this, a modified form of turbulence model 'k-ε' is used also during the solution procedure. The thermal profiles predicted by the mathematical model agree with those predicted by another industrial model. The temperature distributions and solid shell thickness profile were studied in the continuous casting at different conditions. The results from the analyses are applicable to the design of the continuous casting process.
An electrostatic micromachined pump is designed and simulated. The designed micropump has the adv... more An electrostatic micromachined pump is designed and simulated. The designed micropump has the advantages of flow rate controllability, self-priming, small chip size, and low power consumption. The designed micropump is simulated by the Runge-Kutta method. The flow rate of the designed micropump is considered 10 µl/min which is quite suitable for drug delivery applications, such as chemotherapy. The simulation results for the first membrane deflection with different materials and at pulsed applied voltage is introduced.
The electric power grid is a complex interconnected system. The state estimation with phasor meas... more The electric power grid is a complex interconnected system. The state estimation with phasor measurement units (PMU) are powerful technique for system monitoring and control. The results of state estimation are more accurate, when using phasor measurement units in the complex power systems. The state estimation problem in electrical power system consists of many basic operations, one of them, detection and identification of bad measurement. In this paper a proposed technique of state estimation using phasor measurement units is discussed and implemented. Furthermore, it is also shown that bad data in any of the measurements can be detected and identified provided certain redundancy requirements are met. The technique is applied to IEEE 30 nodes system. Test results show the effectiveness of the proposed method to improve the quality of the state estimator solution, and led to reliable and trustable system when feeding the nuclear installations .
An electrostatic micromachined pump is designed and simulated. The designed micropump has the adv... more An electrostatic micromachined pump is designed and simulated. The designed micropump has the advantages of flow rate controllability, self-priming, small chip size, and low power consumption. The designed micropump is simulated by the Runge-Kutta method. The flow rate of the designed micropump is considered 10 µl/min which is quite suitable for drug delivery applications, such as chemotherapy. The simulation results for the first membrane deflection with different materials and at pulsed applied voltage is introduced.
Engineering Computations, 2002
ABSTRACT Large eddy simulation and direct numerical simulation have become one of the best method... more ABSTRACT Large eddy simulation and direct numerical simulation have become one of the best methods to predict the turbulent unsteady flows. But approaches require powerful computers and significant computer time. RANS-Reynolds Averaged Navier-Stokes-with turbulence models which saves the time and money. There are many turbulence models, such as k-epsilon, k-omega, Spalart-Allmaras, zero equation, and so on to serve the simulating of flow past or in 2-D geometries. In fact, many different publications with good results showed that k-epsilon still the best one of them, this is from the point of view of comparison with experimental data. In the present work, the numerical results were obtained using a two dimensional finite-volume code which solves the governing equations in a vertical plane with k-� as a suitable turbulence model for the studied two-dimensional case. The pressure field is obtained with the well-known simple algorithm. The hybrid scheme was employed for discretization of convection in all conservation equations. The considered case study is flow and heat transfer through sudden contraction. In spite of such simple form with complex flow, different applications can be found in practice such as piping systems, cooling passages of modern gas turbine blades and in the turbulent promoters of gas cooled reactors.
A mathematical model of condensation of mixtures of steam and noncondensable gas flowing downward... more A mathematical model of condensation of mixtures of steam and noncondensable gas flowing downward an isothermal vertical tube is investigated. A methodology for modeling condensation, based on the stagnant film theory, and compatible with the reviewed ...
The 7th International Conference on Information Technology, May 12, 2015
Numerical simulation of coolant flow inside the rod bundle of a nuclear reactor is of great engin... more Numerical simulation of coolant flow inside the rod bundle of a nuclear reactor is of great engineering interest. In the design of innovative core solutions, such as high conversion tight lattice cores for Light Water Reactors (LWR), as flow distribution cannot be calculated with exact analytical methods, numerical modeling plays a vital role. A computational fluid dynamics (CFD) methodology is proposed to investigate the thermal-hydraulic characteristics in a rod bundle. Using a three dimensional numerical solution, the characteristics of an isotropic k-epsilon turbulence model for use in modeling turbulent interchange mixing within rod arrays was investigated. The model used to predict the radial component of turbulent eddy viscosity and wall shear. Existing data of Nusselt number distributions in the axial direction obtained by different authors have been employed to validate the CFD model.
A numerical model is developed, by using finite volume method to solve the two-dimensional unstea... more A numerical model is developed, by using finite volume method to solve the two-dimensional unsteady flow and energy equations for simulating the flow and heat transfer with solidification in round billet continuous casting. The strongly coupled set of partial differential equations representing the conservation of mass, momentum and energy are employed. In addition of this, a modified form of turbulence model 'k-ε' is used also during the solution procedure. The thermal profiles predicted by the mathematical model agree with those predicted by another industrial model. The temperature distributions and solid shell thickness profile were studied in the continuous casting at different conditions. The results from the analyses are applicable to the design of the continuous casting process.