Yazar "Tantekin, A." seçeneğine göre listele

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    Öğe
    MODELING FLOOD SHOCK WAVE PROPAGATION WITH THE SMOOTHED PARTICLE HYDRODYNAMICS (SPH) METHOD: AN EXPERIMENTAL COMPARISON STUDY
    (Corvinus Univ Budapest, 2019) Turhan, E.; Ozmen-Cagatay, H.; Tantekin, A.
    The applicability of experimental and numerical models used for the solution of dam-break flows is vital for better dam projects and also in preventing related accidents. The high cost and the time-consuming nature of laboratory studies require consistency in the investigation of numerical models. In this study, the propagation of a flow using a fluid with a different density from that of normal water in the reservoir was investigated both experimentally and numerically. Salt water was preferred as a Newtonian fluid in order to observe the propagation of flows in different density after a sudden break. A small-scale channel was constructed and laboratory data were obtained using image processing techniques. For the numerical model, Smoothed-Particle Hydrodynamics (SPH) method and Reynolds Averaged Navier-Stokes (RANS) equations solved by Flow-3D software, were applied. Flow depth changes were observed in the reservoir and the downstream. The data obtained from all methods were compared with each other. The results of two numerical simulations point out that the disagreements on graphs in the time evolutions of the fluid levels in the SPH increase due to turbulence effects, whilst, these differences decrease in the RANS equations solved by Flow-3D software. Consequently, since the SPH provides taking the measures and developing intervention strategies to reduce the risks connected to the evolution of dam-break flows, it is thought that future validation studies of the model will be require with the use of data observed in this field.
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    Öğe
    PERFORMANCE ASSESSMENT OF A COGENERATION SYSTEM IN FOOD INDUSTRY
    (2018) Özdil, N. F.; Tantekin, A.; Pekdur, A.
    Extensive analysis of the thermodynamics first and second laws is performed on a 14.25 MW cogeneration plantin Adana, Turkey. In this study, the most important parts of the system is observed and thermodynamic performanceassessments are evaluated. The obtained outcomes indicate that major exergy destruction happens in boiler, whichis 42% of the whole system irreversibility. Moreover, the economizer and chimney have also considerableirreversibilities which are 29% and 25%, respectively. The energy efficiencies of the chimney, economizer andboiler are calculated as 61.68%, 66.03%, 79.91%, respectively. On the other hand, the exergy efficiencies ofchimney, economizer and boiler are calculated as 96.56%, 30.27% and 71.94%, respectively.
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    Öğe
    PERFORMANCE ASSESSMENT OF A COGENERATION SYSTEM IN FOOD INDUSTRY
    (Yildiz Technical Univ, 2018) Ozdil, N. F.; Tantekin, A.; Pekdur, A.
    Extensive analysis of the thermodynamics first and second laws is performed on a 14.25 MW cogeneration plant in Adana, Turkey. In this study, the most important parts of the system is observed and thermodynamic performance assessments are evaluated. The obtained outcomes indicate that major exergy destruction happens in boiler, which is 42% of the whole system irreversibility. Moreover, the economizer and chimney have also considerable irreversibilities which are 29% and 25%, respectively. The energy efficiencies of the chimney, economizer and boiler are calculated as 61.68%, 66.03%, 79.91%, respectively. On the other hand, the exergy efficiencies of chimney, economizer and boiler are calculated as 96.56%, 30.27% and 71.94%, respectively.
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    Öğe
    THERMODYNAMIC ANALYSIS OF A FLUIDIZED BED COAL COMBUSTOR STEAM PLANT IN TEXTILE INDUSTRY
    (Yildiz Technical Univ, 2017) Tantekin, A.; Ozdil, N. F.
    The examinations of first and second laws of thermodynamics are performed on a 6.5 MW power plant, established in Adana, Turkey. The equipment for the investigated plant can be aligned as a fluidized bed coal combustor (FBCC), a heat recovery steam generator (HRSG), an economizer (ECO), fans, pumps, a cyclone and a chimney. Whole parts of equipment are investigated separately and energetic and exergetic inspections are enforced for whole parts of the plant. The maximum exergy destruction rates in the plant are obtained for the FBCC, HRSG and ECO with 95%, 3% and 1% of the whole system, respectively. Higher excess air in the system induces heat losses, especially in the FBCC component by virtue of the rising in mass flow rate of the flue gas. This situation can be considered as one of the primary reasons of irreversibility. Additionally, higher excess air induces the decrement of combustion efficiency in FBCC. Therefore, this value and adverse effects on combustion efficiency can be decreased by reducing the flow rate of air.