Browsing Mechanical Engineering by Author "2"
Now showing items 21-40 of 88
-
Direct liquid cooling of high flux LED systems: hot spot abatement
Tamdoğan, Enes; Arık, Mehmet; Doğruöz, M. B. (ASME, 2013)With the recent advances in wide band gap device technology, solid-state lighting (SSL) has become favorable for many lighting applications due to energy savings, long life, green nature for environment, and exceptional ... -
Discrete-dipole approximation with surface interaction: computational toolbox for MATLAB
Loke, Vincent L. Y.; Mengüç, Mustafa Pınar; Nieminen, T. A. (Elsevier, 2011-07)We describe a MATLAB toolbox that utilizes the discrete-dipole approximation (DDA) method for modelling light interaction with arbitrarily-shape scatterers in free space as well with planar surface interaction (DDA-SI). ... -
Effect of chemical mechanical polishing on surface nature of titanium implants FT-IR and wettability data of titanium implants surface after chemical mechanical polishing implementation
Özdemir, Zeynep; Başım, Gül Bahar (Elsevier, 2017)Bioactivity of titanium depends on the quality and characteristics of its surface oxide film. Through implementation of chemical mechanical polishing (CMP) process on titanium plates, a protective oxide (titania) film grows ... -
Effect of coating method on the surface characteristics of niti shape memory alloy
Şimşek, Görkem Muttalip; İpekoğlu, M.; Yapıcı, Güney Güven (Trans Tech Publications Ltd, 2020)Metallic materials including stainless steel, cobalt-chromium alloys, titanium and its alloys, and nickel-titanium (NiTi) shape memory alloys have been used in biomedical applications since the 1940s due to their favorable ... -
The effect of curvic coupling joints on the roto rdynamic characteristics of gas turbines with tie-shaft
Şimşek, Uğur; Şendur, Polat; Yaşar, A. (Canadian Acoustical Association, 2019)The importance and use of curvic coupling joints are garnering interest in many aero-engine rotordynamics applications thanks to their benefits such as lower stress, higher service life, reliable positioning, precise ... -
Effect of direct liquid cooling on light emitting diode local hot spots: Natural convection immersion cooling
Tamdoğan, Enes; Arık, Mehmet (Begell House Inc., 2014)The increased popularity of solid state systems with the technological developments have led them to be a favorable choice for many lighting applications besides electronics. However, the development of denser high lumen ... -
Effect of direct liquid cooling on the light emitting diode local hot spots? A computational and experimental study
Tamdoğan, Enes; Arık, Mehmet (Begell House Inc, 2014)The increased popularity of solid state systems with the technological developments have led them to be a favorable choice for many lighting applications besides electronics. However, the development of denser high lumen ... -
Effect of electrostatic stabilization on thermal radiation transfer in nanosuspensions: Photo-thermal energy conversion applications
Al-Gebory, Layth Wadhah Ismael; Mengüç, Mustafa Pınar; Koşar, A.; Şendur, K. (Elsevier, 2018-04)Solar thermal collectors are among the most important photo-thermal energy conversion systems. Effectiveness of these systems is measured by the ability of working fluid to absorb incident radiative energy. Although ... -
Effect of grain size on the very high cycle fatigue behavior and notch sensitivity of titanium
Sajadifar, Seyed Vahid; Wegener, T.; Yapıcı, Güney Güven; Niendorf, T. (Elsevier, 2019-12)The very high-cycle fatigue performances of coarse-grained and ultrafine-grained titanium samples with different geometries at ambient temperature and various stress amplitudes were investigated. Severe plastic deformation ... -
The effect of pH on particle agglomeration and optical properties of nanoparticle suspensions
Al-Gebory, Layth Wadhah Ismael; Mengüç, Mustafa Pınar (Elsevier, 2018-11)Nanoparticle suspensions (NPSs) are used extensively to improve the thermal efficiency of different engineering systems because of their unique thermo-optical properties. NPSs have also been uses in coatings as they improve ... -
Effect of purity levels on the high-temperature deformation characteristics of severely deformed titanium
Sajadifar, Seyed Vahid; Yapıcı, Güney Güven (Springer International Publishing, 2017)In the present investigation, high-temperature compression tests were conducted at strain rates of 0.001 to 0.1 s−1 and at temperatures of 873 K to 1173 K (600 °C to 900 °C) in order to study the hot deformation characteristics ... -
Effect of severe plastic deformation on the damping behavior of titanium
Sajadifar, Seyed Vahid; Atli, C.; Yapıcı, Güney Güven (Elsevier, 2019-06-01)In this work, influence of severe plastic deformation on the damping properties of commercial purity titanium is explored. Deformation induced grain refinement improved the strength at room temperature while this effect ... -
Effects of turbulence intensity and length scale on the flame location of premixed turbulent combustion in a diffuser combustor
Nazzal, Ibrahim Thamer; Ertunç, Özgür (J-STAGE, 2017)This study focused on the dependency of the flame location of a premixed propane-air flame on turbulence intensity and length scale. The flame location was investigated using a diffuser-type combustor to show the response ... -
Elevated temperature mechanical behavior of severely deformed titanium
Sajadifar, Seyed Vahid; Yapıcı, Güney Güven (Springer Nature, 2014-05)In this investigation, compression tests were performed at a strain rate of 0.001-0.1 s(-1) in the range of 600-900 degrees C to study the high temperature deformation behavior and flow stress model of commercial purity ... -
Enhanced thermal performance of high flux led systems with two-phase immersion cooling
Cengiz, Ceren; Muslu, Ahmet Mete; Arık, Mehmet; Doğruöz, B. (IEEE, 2020)Considering significant worldwide use of electricity for general lighting, the implementation of energy efficient technologies is highlighted in many platforms with the use of light emitting diodes (LEDs). Because of its ... -
Evaluation of NaOH pre-treatment on the corrosion behavior and surface characteristics of hydroxyapatite coated NiTi alloy
Şimşek, Görkem Muttalip; Ipekoglu, M.; Yapıcı, Güney Güven (Springer Nature, 2020-08-02)Successful short-term implementation of nickel-titanium (NiTi) alloys as implants has been a motivation for the development of long-term applications. However, rendering these as safe implant materials is challenging. The ... -
An experimental and computational study on efficiency of white LED packages with a thermocaloric approach
Yuruker, S. U.; Tamdogan, Enes; Arık, Mehmet (IEEE, 2017)Thermal management of light-emitting diode (LED) chips is crucial for light extraction and lifetime. It is well known that the light output of an LED decreases with the elevated temperatures. For higher light extraction, ... -
Fatigue behavior of friction stir welded joints of pure copper with ultra-fine grains
Salahi, Salar; Yapıcı, Güney Güven (Elsevier, 2015)In order to determine the long term durability of friction stir welded joints with ultra-fine grained microstructure, investigation of the mechanical response with specific emphasis on fatigue behaviour is critical. In ... -
Flow and heat transfer study of an impinging piezoelectric fan over a vertical surface
Parsa, Shadi Habibi; Ghaffari, Omidreza; Solovitz, S.; Arık, Mehmet (ASME, 2016)Piezoelectric fans are low-form-factor cooling devices, which have gained recent attention for electronics cooling. These devices feature a vibrating blade, which sheds vortices from its tip during its motion. The performance ... -
Fluid flow characteristics inside convergent, divergent and straight open-end pressure swirl atomizer
Razeghi, Alireza; Ertunç, Özgür; Hacibekir, T.; Savci, İ. H. (Europe, Institute for Liquid Atomization and Spray Systems, ILASS, 2020)Effects of geometrical parameters on the performance of small-scale open-end pressure swirl atomizers (PSA) have been studied using computational fluid dynamics. The shape of the swirl chamber is the main geometrical feature ...
Share this page