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İptal
Bulunan: 19 Adet 0.001 sn
- Eklemek veya çıkarmak istediğiniz kriterleriniz için 'Dahil' / 'Hariç' seçeneğini kullanabilirsiniz. Sorgu satırları birbirine 'VE' bağlacı ile bağlıdır.
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Filtreler
Filtreler
Bulunan: 19 Adet 0.001 sn
Koleksiyon : Makine Mühendisliği ... ✕Koleksiyon : Mühendislik ve Doğa ... ✕
Koleksiyon [3]
İlgili Araştırmacılar [13]
Ambargo Durumu [1]
Tam Metin [2]
Yayın Türü [2]
Yazar/lar [20]
Atıf Dizini [4]
Konu Başlıkları [20]
Yayıncı [16]
Yayın Tarihi [8]
Yayın Dili [3]
Erişime Açık

ORÇ ile Düşük Sıcaklıklı Isı Kaynaklarından Elektrik Üretilmesinde Islak ve Yeni Nesil Akışkanların Çevresel ve Termodinamik Performanslarının Karşılaştırılması

ATA, Sadık | BOYACIOĞLU, Emin | ŞAHİN, Remzi | KAHRAMAN, Ali

Organik Rankine Çevrimi (ORÇ), termal enerjiyi elektrik enerjisine dönüştüren, yüksek oranda erişilebilir, yaygın olarak kullanılan bir enerji üretim şeklidir. ORÇ’de, türbin jeneratörü termal enerjiyi önce mekanik enerjiye sonra da jeneratör aracılığıyla elektrik enerjisine dönüştürür. Sıradan buhar türbinleri ile karşılaştırıldığında; ORÇ sisteminde dolaşan organik akışkanlar su buharının yerini alır, ancak sudan daha yüksek moleküler ağırlıklı organik sıvıları buharlaştırarak sirkülasyon hızını düşürür ve metal parçalar üzerindeki basıncı azaltır. ORÇ’nin ideal akışkanları genellikle sıfır ...Daha fazlası

Makale 2021 NEÜ FMBD 4 Görüntülenme
Erişime Açık

Determination of Optimum Pinch Point Temperature Difference Depending on Heat Source Temperature and Organic Fluid with Genetic Algorithm

ATA, Sadık | KAHRAMAN, Ali | ŞAHİN, Remzi

In this study, the effect of evaporator pinch point temperature difference (∆TPP,e) value in Organic Rankine Cycle (ORC) on system performance was determined. Under different applications of ORC, optimum ∆TPP,e value has been determined in ORC systems designed with different heat source temperatures. By changing the ∆TPP,e value, the heat input provided to the system, the mass flow of organic fluid, the evaporation pressure and the enthalpy drop in the turbine are affected. In thermodynamic optimization, the objective function is determined as turbine power maximization. Genetic algorithm opti ...Daha fazlası

Makale 2022 Academic Platform Journal of Engineering and Smart Systems (APJESS) 7 Görüntülenme
Erişime Açık

Bifilms And Hot Tearing Of Al-Si Alloys

ÇETİN, Remzi | ULUDAĞ, Muhammet | DIŞPINAR, Derya

Hot tearing is one of the most interesting defects that can be found during casting of aluminium alloys. The definition of this defects has some uncertainties such as “it does not always appear under apparently identical conditions” or “the defect is highly specific to certain alloys”. There are several works in the literature on the modelling and analytical approaches. However, the experimental findings have not been satisfactory. In this work, A356, A380 and A413 alloys were cast in two different moulds to investigate the hot tearing tendency with regard to the melt quality. It was found tha ...Daha fazlası

Konferans Bildirisi 2016 Shape Cutlng: 6th lntenudlmud Symposiam, Springer Link 6 Görüntülenme
Erişime Açık

Alternative System Design for High Temperature Solid Particle Erosion Wear Problem

DEMİRCİ, Musa | BAĞCI, Mehmet

In order to simulate the wear behavior of materials subjected to solid particle erosion due to high temperature as well as velocity effect in operating conditions such as power plants and jet engines, ASTM G76 standard is not sufficient and test rig compliant with ASTM G211-14 standard must be put forward. In this context, a test rig, alternative to existing systems where solid particle erosion wear experiments can be performed in compliance with high temperature (~ 700 °C) and particle impact velocity (~ 150 m/s) conditions, has been designed and produced. In order to ensure the widespread us ...Daha fazlası

Makale 2021 Springer 2 Görüntülenme
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Methyl methacrylate in external fixation of supracondylar humerus fractures: An experimental study

GÜLEÇ, Ali | ACAR, Mehmet Ali | AYDIN, Bahattin Kerem | DEMİR, Teyfik | ÖZKAYA, Mustafa

Supracondylar humerus fractures are common fractures around the elbow. Open fractures, comminuted metaphyseal fractures and also fractures with bone loss may need to be treated with external fixators. The aim of this study is to compare two different external fixators, tubular external fixators and polymethyl methacrylate with K wires external fixators, with regard to stiffness and stability for metaphyseal-diaphyseal osteotomies of distal humerus close to the joint. Six matched pairs (24 specimens) of second-generation sawbone humerus were prepared in a standard fashion to create a metaphysea ...Daha fazlası

Makale 2018 Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 3 Görüntülenme
Erişime Açık

Study Gas Flow Heating In Micro-Nozzle Through Walls Instead Of Preheating

HAMEED, Amar Hasan

Previously, Preheating has been established in micro-nozzles to increase the specific impulse of thrusters and increase thrust level. However, heating may cause higher viscous losses in micro-nozzles working at low Reynolds numbers. In this work, heating is combined with gas expansion by using heated walls for convergent-divergent micro-nozzle. The flow in 2D micro-nozzle with heat generation inside the side-walls has been numerically simulated and analyzed. A wide range of low Reynolds numbers flow is tested to investigate the effect of flow parameters. A range of diverse amounts of heat flux ...Daha fazlası

Konferans Bildirisi 2016 7 Görüntülenme
Erişime Açık

Prediction and sensitivity analysis under different performance indices of R1234ze ORC with Taguchi’s multi-objective optimization

ATA, Sadık | KAHRAMAN, Ali | ŞAHİN, Remzi

In this study, parametric optimization and sensitivity analysis of performance parameters were performed for the Organic Rankine Cycle (ORC) system at 120 °C heat source temperature. R1234ze, which is called the new-generation fluid, was used in the ORC design. Performance parameters have been selected considering Energy, Exergy, Economy (Turbine performance) and Environmental (Thermodynamic sustainability indices) factors. Six performance indices used in the orthogonal design with Taguchi-ANOVA. These are; thermal efficiency, turbine power, exergy efficiency, total irreversibility, Volume Flo ...Daha fazlası

Makale 2020 Case Studies in Thermal Engineering 4 Görüntülenme
Erişime Açık

Jeotermal ısı kaynaklı Organik Rankine Çevriminde kuru ve izantropik akışkanların çevresel etkilerinin ve termodinamik performanslarının karşılaştırılması

ATA, Sadık | AKSOY, Mehmet | ŞAHİN, Remzi | KAHRAMAN, Ali

Organik Rankine Çevrimi (ORÇ), düşük sıcaklık aralığında su yerine organik akışkanın kullanıldığı bir elektrik üretim sistemidir. ORÇ, elektrik üretmek için atık ısıyı değerlendirmek amacıyla santrallerde kullanılmaktadır. Bu çalışmada kuru ve izantropik akışkanlar kullanılarak ORÇ modelinin çevresel ve termodinamik performans karşılaştırmaları yapılmıştır. Jeotermal uygulamaları kapsamında ısı kaynağı sıcaklığı 110 °C olarak belirlenmiştir. Buharlaşma sıcaklığının 65-100 °C arasında değişmesinin sistem performansı üzerindeki etkisi belirlenmiştir. Performans parametreleri olarak pompa işi, tü ...Daha fazlası

Makale 2022 GUFBD / GUJS Gümüşhane Üniversitesi FBD 3 Görüntülenme
Erişime Açık

Effect of Cooling Intensity and Position on Solidification in Semi-Continuous Casting of Copper

HAMEED, Amar Hasan | MOHAMMED, Ahmed Abdullah | FADHIL, Obaid

Cooling heat flux effect in both primary and secondary cooling zone has been studied in semi-continuous casting of copper billet. Sufficient cooling is essential to reduce casting defects and to get high productivity, however low rate of solidification is aimed in order to get coarser grain size and softer metal for less losses in extrusion. A three-dimensional numerical model has been developed including solidification behavior of copper through mushy zone. At steady state and constant casting speed, solid shell thickness is monitored during the reduction of cooling rate at mould region to av ...Daha fazlası

Makale 2016 Open Journal of Fluid Dynamics 2 Görüntülenme
Erişime Açık

The effect of nanoclay particles on the incubation period in solid particle erosion of glass fibre/epoxy nanocomposites

BAĞCI, Mehmet | ŞÜKÜR, Emine Feyza | DEMİRCİ, Musa | KAYBAL, Halil Burak

During erosion tests of glass fibre/epoxy nanocomposites, an incubation period emerged because of the embedding of abrasive particles into the target material. In this study, the effect of this period on solid particle erosion behaviour was investigated for glass fibre/epoxy composites with the addition of nanoclay. The surface erosion characteristics of the composites were obtained by solid particle erosion tests using angular alumina particles with a size on the order of 400 μm as the erodent. The tests were conducted using impact velocities of ~23 or ~34 m/s and impingement angles of 30°, 6 ...Daha fazlası

Makale 2020 Wear 3 Görüntülenme
Erişime Açık

Effect of Sr and Ti Addition on the Corrosion Behavior of Al-7Si-0.3Mg Alloy

ÇETİN, Remzi | ULUDAĞ, Muhammet | KOÇABAŞ, Mustafa | DIŞPINAR, Derya | CANSEVER, Nurhan

In the present study, the corrosion behaviour of A356 (Al-7Si-0.3Mg) alloy in 3.5% NaCl solution has been evaluated using cyclic/potentiodynamic polarization tests. The alloy was provided in the unmodified form and it was then modified with AlTi5B1 for grain refinement and with AlSr15 for Si modifications. These modifications yield to better mechanical properties. Tensile tests were performed. In addition, bifilm index and SDAS values were calculated and microstructure of the samples was investigated. As a result of the corrosion test, the Ecorr values for all conditions were determined approx ...Daha fazlası

Makale 2017 Archives of Foundry Engineering 3 Görüntülenme
Erişime Açık

Characterization of the Effect of Melt Treatments on Melt Quality in Al-7wt %Si-Mg Alloys

ÇETİN, Remzi | ULUDAĞ, Muhammet | DIŞPINAR, Derya | TİRYAKİOĞLU, Murat

The effects of degassing, holding time and melt additions (Sr, Sr + Ti, Ti, B and B + Sr) on the quality of A356 melts were examined. A total of 120 reduced pressure test samples were collected. Pores in these samples were analyzed via digital image processing to determine the number density of pores as well as the statistical distribution of their sizes. Results showed that in all cases, degassing with argon reduced the number of defects regardless of the additions made to the melts. Moreover, all additions were found to degrade melt quality. The lowest number density of pores in all melts wa ...Daha fazlası

Makale 2017 METALS 6 Görüntülenme
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