Department of Mechanical Engineering, Article

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Coupled thermo-elastic dynamics of rotating pre-twisted blades exposed to thermal shock including nonlinear rotational effects Lotfan, Saeed; Ciğeroğlu, Ender (2025-01-05) Rotating blades operating under high-temperature experience intense mechanical and thermal stresses induced by centrifugal forces and thermal shock. In this research, to address this critical yet understudied topic, couple...
Supercooled erythritol for high-performance seasonal thermal energy storage Yang, Sheng; Shi, Hong-Yi; Liu, Jia; Lai, Yang-Yan; Bayer, Özgür; Fan, Li-Wu (2024-12-01) Seasonal storage of solar thermal energy through supercooled phase change materials (PCM) offers a promising solution for decarbonizing space and water heating in winter. Despite the high energy density and adaptability, n...
Suppressed narrowband reflectance of nanopatterned silicon photovoltaic cells Atak, Eslem Enis; Elçioğlu, Elif Begüm; Özyurt, Tuba Okutucu (2024-12-01) The increasing demand for efficient yet nonpolluting energy conversion technologies require the photovoltaic (PV) systems to have fine-tuned optical responses and suppressed thermalization. PV cells that are based on Silic...
Experimental and numerical investigation on fluid flow and heat transfer behaviour of foam cladded pin fin heat sink Güler, Nursel; Bayer, Özgür; SOLMAZ, İsmail (2024-11-01) As technology advances, there is a growing demand for more efficient cooling solutions in electronics. Open-cell metal foams offer a unique solution, combining the strength of metals with the characteristics of foams, incl...
Accelerated 3D CFD modeling of multichannel flat grooved heat pipes Gökçe, Gökay; Çetin, Barbaros; Dursunkaya, Zafer (2024-10-01) Flat grooved heat pipes (HPs) have become essential in advanced thermal management solutions across various engineering applications. Modeling these devices, especially multichannel flat grooved HPs, involves significant c...
Material modeling and recent findings in transcatheter aortic valve implantation simulations Mutlu, Onur; Saribay, Murat; Yavuz, Mehmet Metin; Salman, Huseyin Enes; Al-Nabti, A.Rahman D.M.H.; Yalcin, Huseyin Cagatay (2024-10-01) Background and objective: Transcatheter aortic valve implantation (TAVI) has significantly transformed the management of aortic valve (AV) diseases, presenting a minimally invasive option compared to traditional surgical v...
Experimentally validated passive nonlinear capacitor in piezoelectric vibration applications Ali Taşkıran, M.; Özer, Mehmet Bülent (2024-10-01) Piezoelectric vibration isolation and energy harvesting applications have been extensively studied in the literature. The studies include linear and nonlinear approaches. Linear methods are simpler but possess inherent lim...
A microfluidic platform for real-time enumeration and high accuracy retrieval of a very low number of cells Şahin, Buket; Doğan, Begüm Şen; Özgür, Ebru; Zorlu, Özge; Yıldırım, Ender; Külah, Haluk (2024-10-01) In recent years, single cell isolation and analysis have become crucial, driven by the need to study rare cells in cell biology research, diagnostics, and personalized medicine. However, existing platforms for isolating sm...
A sensitivity study on the starting simulations of turbojet engines Gullu, E.; Aran, G.; Erk, M.; Baran, Özgür Uğraş (2024-09-19) Gas turbine engine starting models require a lot of calibration to represent reality with acceptable accuracy due to the lack of high-quality component rig data in the sub-idle region. A detailed sensitivity study is prese...
Control of Flow Structures on Nonslender Delta Wing Utilizing Nozzle-Type Bleeding Slots Cetin, Cenk; Yılmaz, Oğuzhan; Yavuz, Mehmet Metin (2024-08-27)
Real-Time Milling Chatter Detection and Control with Axis Encoder Feedback and Spindle Speed Manipulation Çalışkan, Hakan (2024-08-01) This paper introduces a complete real-time algorithm, where the chatter is detected and eliminated by spindle speed manipulation via the chatter energy feedback calculated from the axis encoder measurement. The proposed me...
Exploiting Matrix Stiffness to Overcome Drug Resistance Aydin, Hakan Berk; Özçelikkale, Altuğ; Acar, Ahmet (2024-07-05) Drug resistance is arguably one of the biggest challenges facing cancer research today. Understanding the underlying mechanisms of drug resistance in tumor progression and metastasis are essential in developing better trea...
Investigation of isothermal entropy change, relative cooling power, and refrigerant capacity of GdCoAl nanocomposite thin film by changing the Al ratio at low magnetic fields of 100 Oe and 1000 Oe Bayer, Özgür; PAT, SUAT (2024-07-01) There are two challenges with magnetocaloric materials (MCMs): the production of low-cost materials and the applicability of MCMs at low magnetic fields. Due to the abundance of Al, the effects of Al composition in GdCoAl ...
Method development for estimation of bleed momentum coefficient using surface pressure measurements and in situ hot wire calibration Çetin, Cenk; Yavuz, Mehmet Metin (2024-07-01) Recently, as a passive flow control method, bleeding technique allowing flow of upstream towards suction side by interior passages, has been utilized on non-slender delta wing planforms, where effective geometries can enha...
Optimization of variable pitch milling tools for improved chatter stability Özşahin, Orkun (2024-06-30) Chatter is an important problem in machining operations which causes poor surface quality, increased tool wear, failure of cutting tool and even machine tool, and excessive noise during machining hence reduced productivity...
Effects of translaminar edge crack and fiber angle on fracture toughness and crack propagation behaviors of laminated carbon fiber composites Asan, Ahmet Murat; Kaman, Mete Onur; Dağ, Serkan; Erdem, Serkan; Turan, Kadir (2024-06-01) In this study, the translaminar fracture toughness of carbon fiber laminated composites with different layer sequences was investigated experimentally and numerically for different crack directions. In the numerical study,...
Performance improvement in a vertical latent thermal energy storage tank with crossing heat transfer tubes Baghaei Oskouei, Seyedmohsen; Bayer, Özgür (2024-05-30) In a vertical latent thermal energy storage (LTES) tank, the lack of natural convection and domination of conduction results in a slow charging rate. On the other hand, due to large thermal resistances between the cold sur...
Simulation of crack closure effect on cracked beam vibrations Günhan, Dağhan; Acar, Bülent; Kadıoğlu, Fevzi Suat (2024-05-02) Vibrations of beams containing cracks are usually investigated by using open or breathing crack models. Neither one of these approaches considers the plasticity induced crack closure (PICC) phenomena which occurs in fatigu...
Effect of impinging flow on hydrothermal characteristics of a pipe-network mini channel heatsink Salamatbakhsh, Elyas; Bayer, Özgür; SOLMAZ, İsmail (2024-05-01) In the current work, a lattice-structured mini channel heatsink is subjected to an impinging flow (IF) in which the flow enters from the top and exits from the lateral sides. An experimental setup is built, and numerical s...
Investigation of the translaminar fracture behavior of the fiber-reinforced composites stitched perpendicular to their plane Asan, Ahmet Murat; Kaman, Mete Onur; Dağ, Serkan; Erdem, Serkan; Turan, Kadir (2024-05-01) To increase the fracture toughness, the two-dimensional laminated textiles can be stitched with fibers throughout their thickness. But the stitch properties effect the mechanical behavior of the composite plates. Because o...

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