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ÖZALP, ABDURRAHMAN ALPER

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ÖZALP

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ABDURRAHMAN ALPER

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2016 - 201912020 - 20222
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    Publication
    Single track geometry prediction of laser metal deposited 316l-si via multi-physics modelling and regression analysis with experimental validation
    (Korean Inst Metals Materials, 2022-06-11) Müslim, Talha; Özalp, A. Alper; ÖZALP, ABDURRAHMAN ALPER; Bıyıklı, Merve; BAYRAM, ALİ; Karagöz, Taner; Calli, Metin; Mühendislik Fakültesi; Otomotiv Mühendisliği Bölümü; 0000-0002-4148-3163; 0000-0002-4976-9027
    Laser metal deposition (LMD) is an additive manufacturing process used in manufacturing freeform geometries, repair applications, coating and surface modification, fabrication of functionally graded materials. It has a broad range of applications in various industries, including aviation, space, defence, automotive, tooling, etc. In this work, a multi-physics model of the LMD process was developed to rapidly predict the geometrical characteristics of the single clad track using the commercial software package Flow-3D. The volume of fluid (VOF) method was integrated to differentiate the interface between the metallic and gaseous cells. To validate the numerical model single bead tracks were deposited, and cross-sections of the beads were analysed. Mathematical formulae to predict different aspects of the single clad track (height, width, and depth) were derived using regression analysis. The influence of the process parameters on the geometrical characteristics of the single clad track was analysed in detail using analysis of variance (ANOVA). Both multi-physics model and mathematical regression model results were compared to the experimental measurements. The results were in good agreement with the experimental results.
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    Numerical investigation of heat and flow characteristics in a laminar flow past two tandem cylinders
    (Vinca Inst Nuclear Sci, 2021-01-01) Aydın, Neslihan; Özalp, Alper; Karagöz, İrfan; AYDIN, NESLİHAN; ÖZALP, ABDURRAHMAN ALPER; KARAGÖZ, İRFAN; 0000-0002-7442-2746; AAB-9388-2020; AAB-9496-2022
    Heat and flow characteristics were investigated numerically for a laminar stream past two tandem circular cylinders placed in a channel. The blockage ratios (beta = D/H) were chosen to be 0.6, 0.7, and 0.8, respectively, and the gap between the cylinders was varied proportionally to the cylinder diameter as g = 0.2D, 0.7D, 1.5D, and 4D at a low Reynolds number (Re = 40). The effects of the blockage ratio, as well as the gap between two cylinders on heat and flow features were examined in detail. Shear stresses, dimensionless static pressure, heat transfer coefficient, and separation points from the cylinders were determined from the velocity and temperature fields in the flow domain. The results showed that the separation angle decreases with both the blockage ratio and the gap size on the downstream cylinder, whereas heat transfer increases with both the blockage ratio and the gap size on the upstream cylinder.
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    Publication
    A computational and experimental investigation of the metallisation effects on the thermal characteristics of an automotive exterior lighting lamp
    (Inderscience Enterprises, 2016-01-01) Boduroğlu, Sercan; Özalp, Abdulrahman Alper; ÖZALP, ABDURRAHMAN ALPER; Mühendislik Fakültesi; Makine Mühendisliği Bölümü; 0000-0002-4976-9027; ABI-6888-2020
    This study was performed to describe the reflector metallisation effects considering the heat transfer characteristics and hot spot formation on an automotive exterior lamp. To form an accurate comparison, three reflectors were studied with emissivities of epsilon(1) = 0.04, epsilon(2) = 0.42 and epsilon(3) = 0.95, which indicated the aluminium-coated, uncoated white and uncoated black reflectors, respectively. The discussion section is organised to address the numerical evaluations using computational fluid dynamics (CFD) and the experimental evaluations. The computational results indicated that, despite the variations in h(conv) and h(rad) with epsilon, the total heat transfer coefficients on the bulb's surface result in a constant value. Additionally, it is observed that the hot spot location on the lens moves to the centre area for a lower reflector emissivity (epsilon(3)->epsilon(1)) as the radiation approaching the lens becomes more effective on the lens's temperature distribution. The numerical and experimental results are compared, and a good agreement is found between them.