Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118043220200401Heat Conduction within Elliptic Enclosure with Internal Heat Generation93988383710.21608/erjm.2020.83837ENFathi MMahfouzMechanical Power Dept.,Faculty of Engineering, Menoufia UniversityJournal Article20200118<strong>Exact and numerical solutions for steady heat conduction in the enclosure between two long isothermal elliptic tubes with uniform internal heat generation are obtained. The heat conduction process within the enclosure is mainly influenced by internal heat generation, axis ratio of inner tube and major axes ratio of the two tubes. The solutions are obtained in terms of the temperature and local heat flux distributions. The study has shown that the numerical results are in excellent agreement with the analytical results.</strong>Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118043220200401Experimental and Computational Study of Melting of Paraffin Wax Inside a Cylindrical Capsules of Elliptical Cross Section991088386510.21608/erjm.2020.83865ENMohamed A.SultanMechanical Engineering Dept, Future Institute of Engineering and Technology, Talkha Egypt.E. A.El-NegiryMech. Power Eng. Dept, Faculty of Engineering, Mansoura University, Mansoura, EgyptH. M.MustafaMech. Eng. Dept., Higher Technological Institute, 10th of Ramadan, Asharqia, EgyptA.M.El-BozMech. Power Eng. Dept, Faculty of Engineering, Mansoura University, Mansoura, EgyptJournal Article20191210This paper focuses on the melting of phase change material capsulated in the elliptical cross-section horizontal cylinder under convective boundary conditions. Different parameters are discussed namely, the HTF inlet temperature and velocity and the aspect ratio of the capsule cross-section. The effect of HTF inlet temperature, inlet velocity, and encapsulant aspect ratio was studied using the CFD software FLUENT6.3.26. A comparison between the numerical and experimental results was made for the system. The experimental results matched well with the heat transfer model. It is shown that the inlet temperature of the heat transfer fluid (HTF) has a great effect on the process of paraffin wax melting. The increase of HTF inlet temperatures increases the PCM liquid fraction and decreases at the same time the total time of melting the capsulated paraffin wax. The geometry of the capsule cross-section represented by its aspect ratio has a sensible effect on the process of paraffin wax melting. Decreasing the aspect ratio of the capsule, i.e elongated the capsule in the direction of flow increasing the PCM liquid fraction and decreases the total time of melting the capsulated paraffin wax. The increase of HTF inlet velocity has a very weak effect on the process of paraffin wax melting.Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118043220200401Investigating the Dynamic response of Electrohydraulic Servo Motor1091178386810.21608/erjm.2020.83868ENM. G.RabieIndustrial Engineering Department, Faculty of Engineering, Modern Academy, EGYPTSobehSelimMechanical Power Engineering Department, Faculty of Engineering, Menoufia
University, Shebin El-Kom, EGYPTM.Abdel AzizMechanical Power Engineering Department, Faculty of Engineering, Menoufia
University, Shebin El-Kom, EGYPTM. A.MoharmMechanical Power Engineering Department, Faculty of Engineering, Menoufia
University, Shebin El-Kom, EGYPTJournal Article20191212The dynamic response of electro-hydraulic servo systems (EHSS) is complex and its characteristics are highly nonlinear. These nonlinear features need to be discussed and modeled as electro-hydraulic servo systems are now the main muscle a lot of applications that need precise and fast control. Therefore, a detailed and precise mathematical model needs to be deducted to get an effective controller design procedure. The goal of this work is to develop a mathematical model, a simulated model using the Simulink program and control method using an effective controller for Electro-hydraulic servo motor (EHSM). These concepts will allow study-ing, analysis and control of the dynamic characteristics of EHSM velocity and position. To demonstrate the effectiveness of this analysis the experimental work has been done via Electro-hydraulic servo mechanism EHS 160, DAQ NI 6008 and Simulink program.<br /><br />Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118043220200401The Effect of Precipitation Hardening on the Properties Hadfield Steel1191258389910.21608/erjm.2020.83899ENAmr A.MohamedFaculty of Industrial Education, Helwan University, EgyptM. K.El-fawkhryCentral Metallurgical Research and Development Institute (CMRDI), Egypt.W. M.El-nahasFaculty of Industrial Education, Helwan University, Egypt.Journal Article20191118The precipitation hardening in chromium containing Hadfield steel is considered as the most traditional mechanism for promoting the technological and mechanical properties of such high alloy steel. Two methodologies of precipitation hardening were suggested to attain the strengthening mechanical and technical properties of this steel. Different precipitates of chromium carbides were stimulated through either pre and post solution hardening treatment. Thereby, the results of the two mechanisms were compared in terms of precipitation morphology, compositions, and mechanical properties. It was found that the deteriorative of toughness was significantly observed at the post solution treatment. Fine chromium carbides Cr7C3, and Cr23C6 were observed throughout the austenite matrix at 650oC, and 700oC as the temperature of the pre-solution treatment technique. It was found that the morphology of chromium carbides has the most significant effect on promoting the strain-hardening property of Hadfield steel studied. When conducting the age-hardening regime followed the solution treatment observed the best toughness of Hadfield steel.Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118043220200401Behavior of RC Beams with Large Openings Subjected to Pure Torsion and Retrofitted by Steel or CFRP Plates1271388391010.21608/erjm.2020.83910ENGhada MousaHekalCivil Eng. Dept, Menoufia University, EgyptBasant AhmedRamadanCivil Engineering Department , Faculty of engineering , Menoufia university , Menoufia EgyptNageh NassifMelekaProfessor, Civil Eng. Dept., Faculty of Engineering, Menoufia UniversityJournal Article20200105Torsion considered with an increasingly great importance by structural engineers. Some of the typical cases are space frames, spandrel beams, beams supporting balconies, eccentrically loaded beams, spiral staircases, horizontally curved beams, skew bridges, etc. Transverse openings, in Reinforced Concrete (RC) beams may be essential required for accommodating utility services in a building structure. Provision of an opening through a beam, however, changes its simple mode of behavior to a more complex one. Therefore, the design of such beams needs special treatment.<br /> Strengthening or retrofitting of concrete structures to compensate the presence of transverse opening not only depends on the applied material but also depends on the used technique. Carbon Fiber Reinforced Polymers (CFRP) plates, provide a more technical alternative to the traditional methods of strengthening in many cases as it gives high strength, low weight, corrosion resistance, easy and quick installation and less changes in structural geometry.<br /> An experimental test program of twenty-one RC beams with central large openings subjected to pure torsion were strengthened by using additional layers of externally bonded steel or CFRP plates with different techniques. The behaviors of the tested specimens were investigated and compared to identify the effectiveness of each method and material of strengthening to increase the torsional strength of beam with different opening sizes.<br /> The main conclusions and recommendations drawn from the study were discussed and summarized. The research shows that the methods of strengthening by using externally bonded steel strips fixed by eboxy and steel dowels and CFRP plates gave best results.Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118043220200401Performance of Substrate Reinforced Concrete Slabs with Geopolymer Concrete Overlay1391478391210.21608/erjm.2020.83912ENMariam F.GhazyProf, Structural Engineering Dept., Faculty of Engineering, Tanta University, Tanta, EgyptMetwally A. Abd ElatyAbdel AtyProf, Structural Engineering Dept., Faculty of Engineering, Tanta University, Tanta, EgyptMohamed H.TamanAssoc. Prof. Structural Engineering Dept., Faculty of Engineering, Tanta University, Tanta, EgyptNesreen A.NasrDemonstrator, Tanta Higher Institute for Engineering & Technology, B. Sc. Civil Engineering, Tanta University, Tanta, EgyptJournal Article20191105Geopolymer concrete (GPC) has been used increasingly in recent years and has been applied to various structural components. Considerable interest has been developed in using geopolymer in concrete to increase the load carrying capacity of the structural members in service. It has been used recently to increase the flexural capacity of concrete slabs by applying overlay layer of GPC onto an existing slab, a technique known as cement base bonded overlay. The objective of this research is the investigation of the flexural behavior of substrate cement reinforced concrete (RC) slabs with a GPC overlay. Seven RC slabs with 300 x 1700 x 100 mm, 33 MPa compressive strength after 28 days and reinforced with steel with a diameter of 8 mm. Because the performance of these composite slabs depends on the bonding between the substrate and overlay concrete, six different techniques were used for preparing the RC substrate surfaces including, (as smooth as cast (AS), carving 2mm width and 1 mm deep (Carv), dowels 8 mm Z section (DZ), painting with epoxy resin on the surface (ER), surface roughened by a stiff brush in both the transverse and longitudinal directions (T&L) D and surface roughened in the transverse directions by a stiff brush (TD). The evaluated properties were load-deflection relationship, strain distribution curves and the interface slip.<br />Based on the experimental tests, the ductile performance of the slab depends not only on adding GPC to the topping but mainly on the type of interface roughness. Moreover, the ductility ratio may be arranged in desponding order as (TD), (T&L) D, (ER), (Carv), (DZ) and (AS). The biggest slip happened for slab control at 0.25mm, signifying poor bonding strength at the interface. Slab (L&T) D, with zero mm of slippage, showed the best interface slip.Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118043220200401(اَليات دمج الأنظمة الذکية فى تصميم المبانى الإدارية فى مصر (اقتراح نموذج متکامل لتقييم المبانى الإدارية الذکية1491578393010.21608/erjm.2020.83930ENEman EidAttiaArchitecture, faculty of engineering, menofia University, Shibin elkowm, EgyptMoatazElbeharyArchitecure, faculty of engineering, menoufia University, Shibin elkowm ,EgyptJournal Article20200201Abstract:<br /> The research study deals with how to achieve the mechanisms of integrating the operating systems and the automatic control of buildings in the process of designing office buildings in Egypt. This is done by conducting a theoretical inductive study to know the techniques and technological treatments used in intelligent buildings and to study their capabilities, needs and components, and how these technological systems work along with the study of international standards and protocols for the control and automation systems of intelligent buildings.<br /> Then, the research analyzes a case study of multiple models and the monitoring, analysis of the techniques used in these models of smart management buildings globally and locally. Also, the study of the mechanisms of applying them in the administrative buildings in Egypt is considered. Design determinants and the technological requirements that must be met in the building and drawing the standards and design strategy for smart management buildings in Egypt are satisfied.Menoufia University, Faculty of EngineeringERJ. Engineering Research Journal1110-118043220200401دور المشارکة المجتمعية فى تنمية وتطوير المجتمع المحلى1591688393410.21608/erjm.2020.83934ENEman M.AttiaProfessor, Department of Ach. Eng., Faculty of Engineering, Menoufia UniversityEssra S.TahaDemonstrator, Department of Ach. Eng., Faculty of Engineering, Menoufia UniversityJournal Article20200112Achieving sustainable development in all its aspects (economic, environmental and social) requires a stekholders participation of the development process (government sector, the private sector and civil society). Community participation is a major focus for building development projects for the society in light of the growth and development witnessed by the societies that adopt it. In the absence of interest - at the official level - to involve the local community in urban development projects (planning and architectural), and the role of participation of some civil society institutions are often limited to decision making process of the project. The research aims to encourage the participation of individuals within their communities through sound methodologies adopted by the stakeholders to the development process in their communities. The research prposes a framework with specific phases to achieve effective participation which will reflect positively on sustainability success for project development. The research methodology follow the theoretical inductive approach through a literature review of global and local development initiatives to derive different tools and phases that constitute the operational framework for the participatory development process. It also follows the case study approach in order to monitor the effectiveness of the role of community participation in the development of urban aspects as well as the role of the stakeholders in activating the participatory process and implementing it with the appropriate tools within existing cases. The research consists of a theoretical background dealing with an introduction to participatory development in the local community and its presence within the global framework for sustainable development. It also includes a review of the Egyptian policies and laws in support of participatory development. The field study was based on rigorous observations and interviews in data collection and analysis in the relation to the case studies selected. The research concluded: the direct correlation between individuals participation in projects, a sense of ownership of the development process is achieved by involving the local community in identifying its needs, and that a decentralized framework for decision-making and resource allocation was proven effective when implemented to the local community .