Yazar "Cetinkaya, Muhammet Samet Ali" seçeneğine göre listele

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    Convective Heat Transfer Investigation of a Confined Air Slot-Jet Impingement Cooling on Corrugated Surfaces With Different Wave Shapes
    (Asme, 2019) Ekiciler, Recep; Cetinkaya, Muhammet Samet Ali; Arslan, Kamil
    In this study, air jet impingement on flat, triangular-corrugated, and sinusoidal-corrugated surfaces was numerically investigated. Bottom surface was subjected to constant surface temperature. Air was the working fluid. The air exited from a rectangular shaped slot and impinged on the bottom surface. The Reynolds number was changed between 125 and 500. The continuity, momentum, and energy equations were solved using the finite volume method. The effect of the shape of bottom surface on heat and flow characteristics was investigated in detail. Average and local Nusselt number were calculated for each case. It was found out that Nusselt number increases by increasing the Reynolds number. The optimum conditions were established to get much more enhancement in terms of performance evaluation criterion (PEC). It was revealed that the shape of the cooling surface (bottom wall) influences the heat transfer substantially.
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    Effect of shape of nanoparticle on heat transfer and entropy generation of nanofluid-jet impingement cooling
    (Taylor & Francis Inc, 2020) Ekiciler, Recep; Cetinkaya, Muhammet Samet Ali; Arslan, Kamil
    Al2O3/water nanofluid has been numerically examined for the first time with different nanoparticle shapes including, cylindrical, blade, brick, platelet and spherical, on the flat and triangular-corrugated impinging surfaces. The volume fractions of 1.0%, 2.0% and 3.0% nanoparticles have been used. The Reynolds number is between 100-500 depending on the slot diameter. The finite volume method is utilized to determine the governing equations. The study is analyzed to determine how the flow features, heat transfer features and entropy production were affected by the diversity of nanoparticle shape, nanoparticle volume fraction, and shape of impinging surface. Darcy friction factor and Nusselt number are studied in detail for different conditions. The temperature contours are presented in the case of different nanoparticle volume fractions, nanoparticle shapes and both impinging surfaces. The results of the study suggest that the nanoparticle shape of the platelet shows the highest heat transfer development due to the thinner thermal boundary layer. Heat transfer augments with increasing volume fraction of nanoparticles. In addition, the study is consistent with the results of the literature on heat transfer and flow properties.
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    HEAT TRANSFER ENHANCEMENT IN AN EQUILATERAL TRIANGULAR DUCT BY USING AN Al2O3/WATER NANOFLUID: EFFECT OF NANOPARTICLE SHAPE AND VOLUME FRACTION
    (Begell House Inc, 2020) Ekiciler, Recep; Cetinkaya, Muhammet Samet Ali; Arslan, Kamil
    Forced convective heat transfer of an Al2O3/water nanofluid, having different shapes of nanoparticles including blade, brick, cylindrical, platelet, and spherical, flowing in a three-dimensional (3D) equilateral triangular duct has been studied numerically. The Al2O3 nanoparticle is dispersed with a ratio of 1.0%, 2.0%, and 3.0%. The Reynolds number is in the range of 100-500. A constant heat flux of 420 W/m(2) is delivered to the whole walls. The analysis is made for determining how the heat transfer and flow features are affected by different nanoparticle shapes and volume fractions. Convective heat transfer coefficient, Nusselt number, Darcy friction factor, pumping power, and performance evaluation criterion (PEC) in the duct are analyzed. The results of the study reveal that the nanoparticle shape of the platelet shows the greatest heat transfer enhancement. At the highest Reynolds number, the average Nusselt number enhances up to 25% by using platelet nanoparticle shape when compared to the pure water. Also, heat transfer in the duct increases by increasing the nanoparticle volume fraction. Also, the study is compatible with the outcomes of literature regarding heat transfer and flow features.