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    Exergetic and Exergo-Economical Analyses of a Gas-Steam Combined Cycle System
    (Walter De Gruyter Gmbh, 2022) Gonca, Guven; Guzel, Bulent
    In this study, the results of an investigation of the performance of a gas-steam combined cycle system (GSCCS) under exergetic and exergo-economical criteria are reported. The effective power (P-ef), destroyed exergy (X), efficiency of exergy (epsilon), unit electric generation cost (C-elec) and exergy-dependent economic worth of electrical energy (C-ex,C-elec), which is novelly determined in this study, have been analyzed. The impacts of speed (N), pressure ratio of the gas cycle (lambda), equivalence ratio (phi), the flow rate of the air mass ((m) over dot(a)), the flow rate of the fuel mass ((m) over dot(f)), inlet temperature of the air into the compressor (T-1), steam temperature (T-6) and pressure (P-6) of the heat exchanger, outlet pressure (P-7) of the high pressure steam turbine and condenser pressure (P-9) on P-ef, epsilon, C-elec and C-ex,C-elec have been parametrically evaluated. It was revealed that the stream and component characteristics of the system have significant influences on the performance characteristics of the GSCCS.
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    Insights from sloshing experiments in a rectangular hydrophobic tank
    (Elsevier Science Inc, 2023) Korkmaz, Fatih C.; Guzel, Bulent
    The wave impingement on the side walls due to the oscillation of a rectangular tank under harmonic sway motion is analysed experimentally with hydrophobic coated and uncoated tank surfaces. Impact pressures and free surface deformations are compared in three water filling levels over an excitation frequency range encompassing the first natural frequency. The reduced hydrodynamic loads acting on the tank walls are observed under hydrophobic effects and discussed in detail. Experimental observations clearly indicate that there is a strong effect of the solid surface properties on the free surface elevation, wave generation and pressure distribution. In particular, major changes have been traced around the resonance frequency due to more dominant tangential flow and altered wave form, which results in lower peak pressure values with increased water movement within the tank under the hydrophobic effects.
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    Wave Impact Loads on Vertical Circular Cylinder and the Effect of Hydrophobic Surface
    (TUBITAK, 2023) Al-Beity, Abdallah Mohamed Alwy; Korkmaz, Fatih C.; Guzel, Bulent
    This study presents experimental research on the wave forces affecting cylindrical legs on offshore platforms. The aim was to determine pressure distributions and deformations in the surface properties of altered cylinders by applying a hydrophobic coating. The results show that the hydrophobic coating increases the angle at which water droplets hit the surface, reducing water adhesion. The study used wave loads of 9 cm amplitude and 0.7 Hz frequency, three pressure sensors, and a strain gauge to measure pressure distributions and surface deformations. Findings show that the pressure response for hydrophobic surfaces varied based on the sensor's location, with a decrease in maximum pressure or impact time. Strain measurements for hydrophobic surfaces were 15% higher than for uncoated surfaces due to structural deformation caused by surface property changes. Additionally, hydrophobic cylinders experienced a water rise of at least 1.5 cm compared to uncoated cylinders due to pressure distribution on the hydrophobic surface. The findings suggest that surface modifications, such as hydrophobic coatings, can significantly impact the response of cylindrical structures to wave forces, providing valuable information for offshore platform design and maintenance. Image processing supports this observation, which indicates the variation in the size of the water body to which the surface is exposed. © 2023, TUBITAK. All rights reserved.