Başlık için Makine Mühendisliği Bölümü Koleksiyonu listeleme
Toplam kayıt 56, listelenen: 21-40
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Energy and economic assessments of waste heat recovery by designs of economizer, condensing economizer and air preheater
(Gazi Universitesi, 2023)In this study, the waste heat loss of flue gases from the boilers of Kafkas University district heating system has been calculated between 6-8% according to the combustion analysis and the annual cost of this heat loss has ... -
ENERGY, EXERGY ANALYSIS AND OPTIMIZATION OF INSULATION THICKNESS ON BUILDINGS IN A LOW-TEMPERATURE DISTRICT HEATING SYSTEM
(YILDIZ TECHNICAL UNIV, 2023)In the study, energy and exergy analysis of the buildings on a campus in Turkey are conducted by using actual operating data and taking measurements in the district heating system as a case study. The energy and exergy ... -
Enhanced wear resistance and surface properties of oxide film coating on biocompatible Ti45Nb alloy by anodization method
(Elsevier B.V., 2023)β-Titanium alloys have become increasingly popular as biomaterials because of their low modulus of elasticity and superior corrosion properties in recent years. β-titanium alloy containing niobium is also a biocompatible ... -
Exergetic Analysis of Using Gaseous Fuels in Spark Ignition Engines
(Journal of Thermophysics and Heat Transfer (The American Institute of Aeronautics and Astronautics), 2014)This paper aims to investigate the use of alternative gaseous fuels in spark ignition engines via an exergy analysis.A quasi-dimensional two-zone thermodynamic cycle model is used for this purpose. The intake and exhaust ... -
Exergetic Analysis of Using Oxygenated Fuels in Spark-Ignition (SI) Engines
(Energy & Fuels (ACS Publications), 2009)In this study, the use of the oxygenated fuels in spark-ignition (SI) engines has been investigated by means of exergy analysis. For this purpose, a two-zone quasi-dimensional thermodynamic cycle model was used. The cycle ... -
Exergetic Evaluation of Speed and Load Effects in Spark Ignition Engines
(Edp Sciences S A, 2012)Exergetic Evaluation of Speed and Load Effects in Spark Ignition Engines This study investigates the effects of various operating conditions in spark ignition engines via an exergy analysis. A thermodynamic cycle model ... -
Exergy Analysis of SI Engines
(International Journal of Exergy (Inderscience Publishers), 2008)In this study, exergy (availability) analysis of a Spark Ignition (SI) engine has been performed theoretically during compression, combustion and expansion processes of the engine cycle. For this purpose, a thermodynamic-based ... -
GÜN İÇERİSİNDEKİ GÜNEŞ IŞINIMININ KAPALI ORTAMLARDAKİ DOĞAL TAŞINIMLA ISI TRANSFERİ ÜZERİNE ETKİLERİNİN SAYISAL İNCELENMESİ
(Türk Tesisat Mühendisleri Derneği, 2008-05-12)İki boyutlu kapalı ortamlarda yaz ve kış sınır koşullarında, güneş ışınımından kaynaklanan doğal taşınımla ısı transferi sayısal olarak incelenmiştir. Işınım alan yüzey için zamana bağlı periyodik olarak değişen bir sıcaklık ... -
Gyroscopic suspension for a heavy vehicle
(Inderscience Publishers, 2023)In this study, an angular momentum generated by a flywheel gyroscope is performed as a suspension to prevent vehicle vibration. The frequency equations are derived and the optimal flywheel speed is obtained for vibration ... -
High-cycle fatigue and tensile strength of AZ91 Mg alloy with MAO-epoxy duplex coating
(Institute of Materials and Machine Mechanics, 2023)In this study, an epoxy layer was formed by the immersion process, on the oxide layer grown by the micro-arc oxidation (MAO) treatment of the AZ91 magnesium alloy, using the thin film sealing technology, and its effect on ... -
Influence of post processing on the mechanical properties and wear behavior of selective laser melted Co-Cr-Mo-W alloys
(Elsevier Ltd, 2024)In the study, the effect of laser energy density and post-processes (sintering, cold rolling, and hot rolling) on the properties of Co-Cr-Mo-W alloys fabricated by selective laser melting (SLM) are investigated. The samples ... -
Investigation of biodegradability of doped composite oxide coated AZ91 alloy in blood plasma
(Gazi University, 2022)Magnesium alloys; It is widely used in metallic biomaterials with its low toxic effect and biodegradability. Although these alloys help the formation of new tissues in the body, they provide great advantages over other ... -
Investigation of the Effect of Dual Ignition on the Exhaust Emissions of an SI Engine Operating on Different Conditions by Using Quasi-dimensional Thermodynamic Cycle Model
(Strojarstvo (Croatian Union of Mechanical Engineers and Naval Architects), 2009)In the presented study, the effects of using dual-spark plug and variation of the spark plug location on the exhaust emissions of an SI engine operating in different conditions were investigated theoretically. A quasi-dimensional ... -
Investigation of used PCM-integrated into building exterior walls for energy savings and optimization of PCM melting temperatures
(Elsevier Ltd, 2023)In the study, the effects on the building's thermal energy performance of using two different phase change materials (PCMs) integrated into the exterior walls at various thicknesses and melting temperatures have been ... -
İKİ LEVHA ARASINDAKİ LAMİNER AKIŞTA DEĞİŞKEN DUVAR KALINLIĞININ ISI TRANSFERİNE ETKİSİNİN SAYISAL ANALİZİ
(ULIBTK’03, 2003-09-03)İki paralel levha arasındaki laminer akışta değişken duvar kalınlığının ısı transferi karakteristiklerine etkisi sayısal olarak analiz edildi. Değişken duvar kalınlığı durumları, lineer ve herhangi bir serbest formda incelen ... -
KAPALI KARE ORTAMLARDA YATAY, DÜŞEY VE EĞİK İÇ BÖLMELERİN DOĞAL TAŞINIMLA ISI TRANSFERİNE ETKİSİNİN SAYISAL İNCELENMESİ
(ULIBTK’05, 2005)Kapalı kare ortamlardaki doğal taşınım, ortam içerisinde değişik konumlara iç bölmelerin yerleştirilmesi durumları için sayısal olarak incelendi. İncelenen kapalı ortamın yatay duvarlarının yalıtılmış, düşey duvarlarının ... -
Kapalı Kare Ortamlarda Periyodik Olarak Değişen Sıcaklığa Sahip Duvara Konulan Engelin Doğal Taşınım ile Isı Transferi Üzerine Etkilerinin Sayısal İncelenmesi
(6th International Advanced Technologies Symposium, 2011-05-16)Natural convection heat transfer in square enclosures having a horizontally positioned obstacle on one of the vertical wall is numerically investigated. The obstacle included wall has periodically varying temperature profile ... -
KÖŞE NOKTALARINA ENGEL YERLEŞTİRİLEN KARE KAPALI ORTAMDA DOĞAL TAŞINIMLA ISI TRANSFERİ
(19. Ulusal Isı Bilimi ve Tekniği Kongresi, ULIBTK'13, 2013-09-09)Bu çalışmada, köşe noktalarına engel yerleştirilen kare şeklindeki kapalı ortamda doğal taşınımla ısı transferi sayısal olarak incelenmiştir. Kare şeklindeki kapalı ortamın düşey yüzeyleri farklı sıcaklıklarda tutulurken ... -
Mathematical analysis of spark ignition engine via the combination of the first and second laws of thermodynamics
(Proceedings of Royal Society A-Mathematical Physical & Engineering Sciences (Royal Society Publishing), 2008)This study aims at the theoretical exergetic evaluation of spark ignition engine operation. For this purpose, a two-zone quasi-dimensional cycle model was installed, not considering the complex calculation of fluid motions. ... -
Microindentation on the porous copper surface modulations
(Springer, 2017)This study aimed to investigate the mechanical properties of a surface modulation which was realized through compaction, and then sintering of copper powders. To this goal, Berkovich type of indenter and depth-sensing ...