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    HEAT TRANSFER FROM A SLIGHTLY CURVED CONVEX SURFACE
    (Begell House Inc, 2023) Can, Omer F.; Ozgen, Filiz; Celik, Nevin; Dagtekin, Ihsan
    This study is prepared to analyze the heat transfer from a uniformly heated, slightly curved convex (SCX) surface numerically using computational fluid dynamics (CFD) code of commercial software ANSYS-CFX. Some experimental results are also obtained by means of a wind tunnel setup to confirm the results of numerical study. After a good agreement is achieved between the experimental and numerical results, the effects of some major parameters on heat transfer around the SCX surface are determined by using numerical results. Effects of Prandtl number (Pr = 0.237 to 3431), Reynolds number (Re = 40,000 and 400,000), and curvature ratio (CR = 1, 2, and 4) on local Nusselt number (Nu) along the circumference of SCX are the extracted results. Additionally, new correlations of Nu depending on Re, Pr, and CR are obtained.The prime outcomes of this mathematical investigation are provided here. An exact numerical CFD solution is provided for the turbulent external flow around the curved surface appearing in this study. The graphical solutions of Nu number that show the heat transfer rate of the system can be divided into three regions for various Re numbers. The maximum average heat transfer is observed in the case of higher curvature ratio.
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    Öğe
    NUMERICAL ANALYSIS OF A TURBULENT PLUNGING WATER JET
    (Begell House Inc, 2024) Can, Omer F.; Bagatur, Tamer; Celik, Nevin
    In the present study, we employed multiphase computational fluid dynamics analysis to investigate the mechanisms of air entrainment by plunging liquid jets. The ANSY-CFX commercial software program, which is based on finiteelement analysis, was used in the numerical simulations. The effects of the exit velocity of the jet on the velocity distribution in the pool, bubble depth, and volumetric fraction of air were the extracted results of the simulations. In this article, we conducted verification analyses to compare the results obtained from our numerical runs to the results of a previously published experimental study. Good agreement was achieved between the numerical simulations and the experimental study.
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    Numerical Analysis of External Flow Heat Transfer Around Slightly-Curved Surfaces
    (Springer Heidelberg, 2014) Can, Omer F.; Celik, Nevin; Dagtekin, Ihsan
    In the present study, heat transfer around curved surfaces, such as slightly-convex and slightly-concave surfaces, is investigated numerically. The curvature ratio R varied by varying the ratio of the final apex-to-chord line distance to curvature-radius (r), where the final apex-to-chord line distance to be as 0.05, 0.1 and 0.2 m while the curvature-radius (r) keeps constant as 0.05 m (, 2 and 4). The results are parameterized by Reynolds number Re, ranged from 40,000 to 400,000. Air flow around a circular cylinder body is also simulated for verifications. The heat transfer results have graphically been presented in terms of local Nu numbers. New correlations of average Nu numbers are also derived for both slightly-convex and slightly-concave configurations. As a result, it was concluded that average and local Nusselt numbers decrease with increasing surface curvature ratio R for convex surfaces, whilst they increase for concave surfaces.