Gongcheng Kexue Yu Jishu/Advanced Engineering Science

Abstract : Experimental investigation to enhance the heat storage ability for the parabolic trough collector (PTC) is performed in this study. The performance of the PTC has been integrated with paraffin wax manufactured in Baghdad, Iraq. It has been evaluated experimentally based on the ANSI/ASHRAE 93-1986 standard. A special design for the heating water system is built with a continuous flow and a maximum temperature range of 65 oC. Water is used as the primary working fluid. The operation conditions include constant flow rate of 0.056 kg/s, direct solar radiation range from 120 w/m2 to 895 w/m2. The results show that with an incidence angle of 0, the highest efficiency for the collector is 0.82 %. The results also show that the paraffin wax has a crucial role to absorb the solar energy during the day and disperse the solar energy to the working fluid after sunset..
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Abstract : A devastating threat shocked the world around the end of 2019 when the exceedingly transmittable novel SARS virus, commonly known as COVID-19 transformed from a trifling outbreak in Wuhan, China, into a global pandemic that remains unpredictable and immensely damaging to public health. In Egypt, the first reported case of COVID-19 was in Luxor around February 2020. Later, by March, the World Health Organization (WHO) had issued a statement declaring that all global hospitals, clinics and healthcare facilities were suffering from the rapid spread of the airborne virus among the medical staff. During this period, a distressing global paradigm started to appear as many medical team members lost their lives after being infected by their healthcare facilities. Therefore, this paper aims to propose an ideal design prototype for clinics to be adopted in the New Administrative Capital in Egypt, focusing on the nature of infectious diseases such as COVID-19 through adopting a series of strategies that ensure separate circulation between the patients and doctors, regular ventilation and facilitate the sterilization process. The proposed design is easy to construct and repeat several times for further expansion due to its unique form generation. Additionally, other considerations are taken into account within the clinic prototype to ensure a holistic design approach, for instance: the façade design, interior design, furniture design and the integration of artificial intelligence throughout the clinic to advocate for a contact-free experience. The design proposal is flexible for recreation and adoption in areas with similar properties as that of Egypt..
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Abstract : Air-water two-phase flow development in a vertical pipe has been investigated through service of experiments and simulations in this research. Differential Pressure Transducers (DPTs) and Wire Mesh sensors (WMSs) are used to monitor the two-phase flow in a vertical pipe of 67 mm inlet diameter and 7000 mm length. Computational Fluid Dynamic (CFD) is used to evaluate the experiments of the air-water flow in the vertical pipe using a volume of fluid (VOF) model. The operating conditions cover a range of inlet air superficial velocities from 0.05 to 5 m/s. The inlet water superficial velocity remains constant at 0.2m/s and 0.4 m/s for all experiments. The results show that the bubbly flow is noted at low superficial velocities of gas, slug flow is observed at the moderate flow rates of gas, while the churn flow pattern is observed at high rates of gas. There is no significant effect when the Usl changed from 0.2 m/s to 0.4 m/s on the vertical flow lines. Pressure drop is recorded and compared with the CFD simulations. The CFD results are over estimation compared with the experimental pressured drop with maximum absolute error of 21% at Usl of 0.2 m/s and 25% at Usl 0.4 m/s..
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Abstract : The industrial requirements, it was not satisfied with the development of composite materials but worked to develop new types of them, and among these types, hybrid composite materials gained great interest from researchers and industrialists because of their distinctive properties that contributed to occupying the lead in most engineering, medical and other applications. This research includes, first, the manufacture of particulate reinforcement material (binary composite nanoparticles) using the sol-gel method and the relaxation method. The resulting composite nanoparticles and their properties have been studied by using (EDX, X-Ray, SEM, PSA) assays. The results of the examination showed that the temperature affected the size of the resulting particles in addition to the type of the resulting phases, whereby the lower temperatures gave more nanophase compared to the higher temperature when it gave one phase to zirconia, while the shape of the particles tends to a spherical shape. The second part of the work involves the manufacture of a polymeric mixture consisting of a resin (lamination and methyl vinyl silicone), where methyl vinyl silicone was added according to the weight ratios (4, 8, 12, and 16) to the lamination resin. The properties of the mixture were studied through tests (tensile, bending, shock, and hardness). Where the best results were achieved at the rate (12%). The last part of the work is to manufacture the nano-hybrid composite material by choosing the best blend with the percentage (12%) and it had the highest properties to represent the polymeric base material and using the binary composite nanoparticles as a reinforcement material, Where these nanoparticles were added at rates (3, 6, 9 and 12)%.. The properties of the resulting hybrid composite material were studied through tests (tensile, flexural, impact, and hardness). The results proved that the binary composite nanoparticles improved the properties of the mixture well for both sizes (30 and 89) nm and all mixing ratios compared to the sample free of addition. The best results appeared when adding particles with a size of (30nm) and for all tests compared to samples reinforced with particles with a size of (89 nm). Where this hybrid nanocomposite material can be used in prosthetic applications..
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Abstract : The development of the composite section is of great importance in structural design, while the aim is to reduce weight and deflection in a way that does not affect the composite section's strength and durability. This paper studies the computational analysis of the composite section where the reinforced concrete was replaced with Autoclaved Aerated Concrete (AAC) in the compression zone. The theory of first principles of concrete, together with Hook's law, were adopted to find flexure, shear, equivalent modulus of elasticity, effective moment of inertia, and deflection. Results were discussed and investigated using the finite element models developed by ANSYS WORKBENCH software. It was concluded that the proposed analytical model could efficiently provide the exact solution for the composite section..
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