Yazar "Erdogan, A." seçeneğine göre listele

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    Breeding Late Ripening Apricots in Turkey
    (Int Soc Horticultural Science, 2012) Asma, B. M.; Abaci, Z. Tugba; Kan, T.; Birhanli, O.; Erdogan, A.
    Malatya is considered to be a center of dried apricot production. The production is dependent on only a few cultivars like 'Hacihaliloglu' and 'Kabaasi'. To diversify the production patterns, fresh consumption of apricots grown in the region is being encouraged. For this purpose, extending the harvesting period utilizing early and late table cultivars is crucial. A breeding study aimed to develop new late-ripening apricot cultivars was initiated at Inonu University. A total of 2250 hybrid trees was planted to experimental plots from 24 combinations. More than 1200 hybrid trees developed fruits in two consecutive seasons and the fruits were subjected to pomological analyses. A great deal of variation was observed for maturity date which was controlled by several factors. Several promising hybrids were selected for further investigations. The maturity period ranged 148-172 days for these selections while they produced fruits of 23.2-45.4 g weight and 18.0-22.1% soluble solids.
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    A Performance Analysis on Pressure Loss and Airflow Diffusion in a Chamber with Perforated V-Proflle Diffuser Designed for Air Handling Units (AHUs)
    (Isfahan Univ Technology, 2018) Kamer, M. S.; Erdogan, A.; Tacgun, E.; Sonmez, K.; Kaya, A.; Aksoy, I. G.; Canbazoglu, S.
    Outlet cross-sectional area of fans used in air handling units is smaller than cross-sectional area of chambers which are located next to the fan. In order to ensure efficiently operating of the air handling units, it is required that the air flows through a perforated diffuser to create a uniform air diffusion from fan outlet to following chamber with a minimum pressure loss and uniform velocity distribution. In this concept, numerical simulations and experiments were performed for the chamber with perforated V-profile diffuser, which is often used in air handling units because of its simple geometry and easy manufacturing. Pressure losses were firstly obtained experimentally for different air velocities in the chamber. Then a performance analysis on the air flow diffusion and pressure losses inside chamber with perforated V-profile diffuser for different geometric parameters such as entry length, apex angle, geometry and pattern of hole, plate thickness, porosity and surface roughness has been carried out numerically. It is seen that the experimental results validated with the numerical turbulence model results.
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    A Three-dimensional CFD Study on Multiphase Flow in an FCC Regenerator Integrated with Oxy-combustion
    (Isfahan Univ Technology, 2024) Erdogan, A.
    A vital process for converting heavy petroleum productions is Fluid Catalytic Cracking (FCC). As a major source of CO2 emissions, the regenerator reactor in the FCC unit accounts for about 20-35% of the refinery's total emissions. A common method for reducing CO2 emissions from the FCC regenerator is oxy-combustion, which has different advantages with regard to reducing energy penalties and associated costs. In this study, a computational fluid dynamic (CFD) study was used to examine the hydrodynamic characteristics of solid particles and gas inside the FCC regenerator, allowing CO2 to be captured more efficiently. Utilizing Ansys Fluent platform, the Eulerian-Eulerian model was applied with granular flow kinetic theory. In the simulations, different mesh sizes were tested, and the hydrodynamics of the oxy-combustion regenerator were evaluated by adjusting CO2 flow rates to achieve similar fluidization behaviors. The CFD results indicated that the conventional drag model accurately predicted the density phases within the bed. In oxy-combustion, CO2, due to its density, naturally creates a smaller dense phase compared to air -combustion. Moreover, optimizing the fluidizing gas velocities resulted in enhanced particle mixing, resulting in a distributed flow with vortices within the dense phases due to a reduction in gas velocity. To improve the environmental performance of the FCC unit, this research provides valuable insight into the hydrodynamics of solid catalysts used in the oxy-combustion process.