Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118038120150101A Modified Modular Multilevel Converter with Reduced Number of Power Electronic Components186676110.21608/erjm.2015.66761ENI.A.HarbiDepartment of electrical
Engineering electrical
Engineering Faculty of
engineering Menoufiya
University, EgyptHaitham Z.AzaziDepartment of electrical
Engineering Faculty of
engineering Menoufiya
University, EgyptAzza E.LashineDepartment of electrical
Engineering Menoufiya
University, EgyptAwad.ElsabbeDepartment of electrical
Engineering Faculty of
engineering Menoufiya
University, EgyptJournal Article20191229This paper presents a modified multilevel inverter with a few number of semiconductor<br />switches and increasing number of output levels. One stage of the proposed inverter leads to get<br />seven levels in the output voltage, while, forty-nine levels can be obtained when using two stages.<br />Only six semiconductor switches are required for each stage. Standard DC sources are used, so, <br />DC-DC converter is not required to get the desired output standard voltage. Total harmonic <br />distortion in the output waveform of the two stage inverter is very low, so, using filter to improve <br />output waveform is unnecessary. This topology is valid for all types of loads. Simulation results <br />are presented for one stage and two stage inverters proposed. Experimental results are included for <br />the one stage inverter to verify the theoretical results.Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118038120150101FUEL CELLS VS. RENEWABLE ENERGY SOURCES AS DISTRIBUTED GENERATION9136676910.21608/erjm.2015.66769ENH.A.KhattabElectrical Engineering Department, Faculty of Engineering, Shebin El-Kom,
Minoufiya University, EgyptM.FAwad-allaOperational Engineer in West Delta Electricity Generation Company, Behera , EgyptS.MAllamElectrical Engineering Department, Faculty of Engineering, Shebin El-Kom,
Minoufiya University, EgyptS.MFarragElectrical Engineering Department, Faculty of Engineering, Shebin El-Kom,
Minoufiya University, EgyptJournal Article20191229DGs are small scale generation sources which are located as near as possible at center of loads. <br />Nowadays, these DGs are becoming more prominent in distribution systems due to the incremental <br />demands of electrical energy and to reduce the power disruption in the power system network. <br />Fuel cells (FCs) are new types of DGs which have numerous benefits that make them superior <br />compared to the other types of DGs. This paper presents a deep review of FCs technology,<br />(definition, structure and theory of work). A general description of FC types is explained, <br />indicating advantages and disadvantages of each type and pointing out their principal use. Finally, <br />economics of producing electricity from different types of FCs, wind and solar energy are <br />examined under different conditions.Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118038120150101STUDY OF THE CONFIGURATION AND PERFORMANCE OF AIR-AIR EJECTORS BASED ON CFD SIMULATION15306677110.21608/erjm.2015.66771ENA.MEl-ZahabyMechanical Power Engineering Department, Faculty of Engineering,Tanta University, Tanta,
Egypt.Mofreh HHamed4Mechanical Engineering Department, Faculty of Engineering, Kafrelsheikh University,
Kafrelsheikh, EgyptDean of Higher Engineering Institute, Kafrelsheikh, EgyptZ.MOmara4Mechanical Engineering Department, Faculty of Engineering, Kafrelsheikh University,
Kafrelsheikh, Egypt.A.MEldesoukeyMechanical Engineering Department, Faculty of Engineering, Kafrelsheikh University,
Kafrelsheikh, EgyptJournal Article20191229This paper describes a numerical study of gas-gas ejector (jet pump) performance. The developed<br />model used to study performance determination for different operating conditions and geometrical<br />configurations of ejector. The performance of ejector obtained based on a simulation procedure of<br />linearized and axisymmetric subsonic and supersonic flow using Fluent Package. The CFD model<br />used to evaluate the performance of three different ejector geometries that tested under different<br />working conditions. A conventional finite-volume scheme utilized to solve two-dimensional<br />transport equations with the standard k-ω SST turbulence model. The model is solved in three<br />regions namely, the primary flow nozzle, the secondary flow channel, and the region of interaction<br />between the supersonic nozzle jet and the secondary flow. The effect of the mixing part and tail<br />section (pipe or diffuser) geometries on the ejector performance studied. In addition, the effects of<br />gas motive pressure on the static pressure distributions are also studied. The computational results<br />are validated using published experimental data, where acceptable agreements exist. The<br />numerical results indicate that the ejector geometry has a pronounced effect on the flow<br />parameters (i.e., pressure and gas velocity) and the ejector performance. In addition, predicted<br />numerical results indicate that when the motive-stream velocity exceeds the speed of sound, shock<br />waves are unavoidable inside ejectors and that shock wave pattern in mixing part has a dominant<br />effect on ejector performance. In addition, the results indicate that the shock location inside the <br />nozzle and the separation point are affected by the motive pressure. The results show also that <br />configuration with convergent-divergent mixing section is much better for mixing process than the <br />other tested configurations.Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118038120150101Performance Prediction of Compressible Two-Phase Flow through Ejectors31466677310.21608/erjm.2015.66773ENN.I.IHewedyMechanical Power Engineering Department,
Faculty of Engineering, Menoufiya University,
Shebin El-Kom, Egypt.M.HHamedMechanical Power Engineering Department,
Faculty of Engineering, Menoufiya University,
Shebin El-Kom, Egypt.A.F.MMahrousMechanical Power Engineering Department,
Faculty of Engineering, Menoufiya University,
Shebin El-Kom, Egypt.T.AGhonimMechanical Power Engineering Department,
Faculty of Engineering, Menoufiya University,
Shebin El-Kom, Egypt.Journal Article20191229The objective of present work is to investigate theoretically the performance of two-phase flow <br />(gas-liquid) through ejectors. The numerical investigation is based on non-homogeneous, (liquid <br />and vapor velocities are not equal), non-equilibrium (liquid and vapor temperatures are not equal),<br />two-fluid model, (Eulerian-Eulerian), conservation equations governing steady, two–dimensional <br />(axisymmetric), turbulent, compressible, and parabolic two-phase flow. These equations are <br />namely continuity, momentum, and energy. These equations are solved iteratively using control <br />volume method with Prandtl’s mixing length as a turbulence model. Mass and heat transfer <br />between the liquid and vapor phases are considered. Wall function is used instead of using very <br />fine grid near the wall. The coordinates system is converted to bodyfitted coordinates. Refrigerant <br />134a is used as a working fluid. The Modified Benedict-Webb-Rubin (MBWR) equation of state is <br />used to represent compressibility. The presented model is validated against previously published <br />data in literature. The validation showed reasonable agreement. Effects of changes in geometry <br />and operating conditions on ejector performance are investigated. Moreover, effects of certain <br />parameters on ejector efficiency are presented showing that, for maximum efficiency both <br />geometrical and operational parameters must be carefully selected. Overall, the results lead to <br />useful information for ejector optimum design and prediction of the ejector behavior and <br />performance.Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118038120150101STRUCTURAL BEHVAIOR OF REINFORCED CONCRETE BEAMS CAST USING BLENDED CEMENT47556677510.21608/erjm.2015.66775ENMounir MKamalCivil Engineering Department, Faculty of Engineering, Menoufia University,
EgyptMohamed ASafanCivil Engineering Department, Faculty of Engineering, Menoufia University,
EgyptAmr AElboghdadyMinistry of Water Resources and Irrigation, Dakahlya, EgyptJournal Article20191229An experimental study has been carried out in the present work to study the structural behavior of <br />reinforced concrete beams cast using blended cement concrete. The eight tested beams were 160 <br />cm long × 20 cm deep × 12 cm wide. The test beams were reinforced with two different steel <br />reinforcement ratios of 0.70% and 1.0%. Two beams were control beams cast using Portland <br />cement and the other six beams were cast using blended cement incorporating 5%, 10% and 15% <br />dolomite powder as cement replacement. To achieve the aim of the research; all beams were tested <br />under 4-point loading until failure and the following measurements have been recorded during <br />testing the beams for each load increment; the compressive and tensile strains in concrete and <br />steel, and mid-span deflection. The propagation of cracks was marked on the side and soffit of the <br />beam. The results of monitoring the tensile and compressive strains, mid-span deflection and <br />cracking pattern are presented. The results demonstrated that the 5 percent replacement ratio did <br />not influence the structural behavior, while the ultimate loads and stiffness were reduced as the 10 <br />and 15 percent replacement ratios. On the other hand, the cracking characteristics and failure mode <br />were not influenced by the cement replacement.Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118038120150101STRUCTURAL PERFORMANCE OF SANDWICH PANEL UNDER POINT LOAD57646677710.21608/erjm.2015.66777ENMNawarMSc student, Civil Engineering Department, Faculty of Engineering, Minoufia University, Egypt.BEltalyLecturer, Civil Engineering Department, Faculty of Engineering, Minoufia University, Egypt.KKandeelProfessor, Civil Engineering Department, Faculty of Engineering, Minoufia University, EgyptJournal Article20191229This paper presents the results of the experimental program of three type of sandwich panel; <br />corrugated, web, two-directional corrugated core sandwich panel. Also the current research <br />developed finite element models to simulate the three tested panel under point load up to failure <br />and the model was verified by comparing the results with those obtained from the tests. The <br />numerical simulation gives a better understanding of the behavior of the three types of panel <br />under the point load in terms of the internal forces, deflection and failure modes of the different <br />parts, the top skin, the bottom skin and the core.Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118038120150101PRE-TREATMENT OF OLIVE OIL MILL WASTEWATERS BASED ON SOLAR MANAGEMENT TECHNIQUES: AN INTEGRATED RATIONAL APPROACH65716677810.21608/erjm.2015.66778ENMaha ATonyBasic Engineering Science Department, Faculty of Engineering, Minoufiya University, Shbin Elkoum, Minoufiya, EgyptAghareed MTayebChemical Engineering Department, Faculty of Engineering, Minia University, Minia, EgyptJournal Article20191229Wastewater contaminated with olive oil which simulates the olive oil mills has been treated by <br />means of Advanced Oxidation Processes (AOPs). The Fe(II)/H2O2 system (Fenton’s reagent), <br />Fe(II)/H2O2/UV system (solar-photo-Fenton’s reagent) and the UV-photolysis were applied. A <br />synthetic wastewater generated by emulsifying olive oil and water was used. Experiments were <br />carried out using a concentrating Parabolic Trough Reactor (PTR). Oil is readily degradable, the <br />sunlight is captured by ferrioxalate which, in the presence of hydrogen peroxide, generates <br />hydroxyl radicals that oxidizes organic molecules. In addition, the process efficiency is increased <br />by using oxalic acid. Typical operating variables such (H2O2 and Fe(II)) exerted a positive <br />influence on the treatment efficiency. The optimum working pH on the Fenton treatment was <br />found to be in the range 2.5-3.0. Response Surface Methodology (RSM) based on the experimental <br />design was applied to optimize the Fenton oxidation process.Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118038120150101USING A LOW-COST AGRICULTURE WASTE FOR CATIONIC DYE REMOVAL FROM AN AQUEOUS SOLUTION: EQUILIBRIUM SORPTION73796677910.21608/erjm.2015.66779ENEAshourMaha ATonyJournal Article20191229Bare palm fibre was investigated for its ability to perform as a suitable sorbent for methylene <br />blue dye from an aqueous solution. The effect of sorbent dose and temperature was investigated <br />using a batch sorption technique. The results revealed the potential of palm fibre, an agricultural <br />waste, as a low-cost sorbent for the dye examined. The isotherm data were closely fitted to the <br />Langmuir and Frendlich equations and the dye sorption capacity of palm increased as the sorbent <br />dose decreased. Maximum saturated monolayer sorption capacity of bare palm branches for <br />methylene blue dye was investigated. Reaction parameters such as change in particle size of the <br />sorbent material, sorbent mass, air flow rate, initial dye concentration and the medium temperature <br />were also evaluated. In addition, relationships between sorbent dose and Langmuir; Frendlich <br />constants were developed and are presented. The principal conclusions of the study are that the <br />reaction follows the pseudo first order reaction kinetics.