Arama Sonuçları

Listeleniyor 1 - 3 / 3
  • Öğe
    Experimental determination of the mechanical properties of adhesive joints bonded epoxy adhesive included Al2O3 nanoparticule
    (European Journal of Technic, 2016-08-01) Adin, Hamit; Saraç, İsmail; Temiz, Şemsettin
    Yapıştırma bağlantılarında, yapıştırıcı içerisine katılan nanopartiküllerin, bağlantıların mekanik özelliklerine etkisi ile ilgili araştırmalar son zamanlarda dikkat çekmektedir. Bu çalışmada; epoksi yapıştırıcı içerisine % 2 oranında Al2O3 nanopartikül katılarak ve katkısız epoksi yapıştırıcı kullanılarak tek tesirli bindirme bağlantıları oluşturulmuş ve bağlantıların mekanik özellikleri çekme yükü altında 20 mm, 25 mm ve 30 mm bindirme boylarında deneysel olarak incelenmiştir. Deneysel çalışmalarda DP460 epoksi yapıştırıcısı, Al2O3 nanopartikülleri ve yapıştırılan malzeme olarak St-37 çeliği kullanılmıştır. Deneylerden elde edilen sonuçlar incelendiğinde; % 2 Al2O3 nanopartikül katkılı yapıştırıcıların kullanılmasıyla 20 mm ve 30 mm bindirme boylu bağlantılarda genel olarak hasar yükü azalmıştır. Ancak 25 mm bindirme boyunda % 5 oranında bir artış görülmüştür. Ayrıca nanopartikül ilavesi bağlantıların uzama kapasitelerine azaltıcı yönde etki yapmıştır.
  • Öğe
    Thermal performance enhancement of flat-plate solar collectors by means of three different nanofluids
    (Elsevier, 2018-12) Budak Ziyadanoğulları, Neşe; Yıldız, Cengiz; Yücel, Halit Lutfi
    Solar energy, which comes first among renewable energy sources, enables efficient use of energy with many applications due to its low operating cost and environmental friendliness. In this study, we experimentally investigated the effects on thermal efficiency of nanofluid and water as working fluids in flat-plate solar collector hot water solar energy systems. Nanofluids were prepared by adding Al2O3, CuO, and TiO2 nanoparticles at 0.2, 0.4, and 0.8 vol% into distilled water, and then the thermophysical properties (thermal conductivity, viscosity) of the prepared nanofluids were determined. Flow rate was adjusted to 250 l/h at given concentrations for each nanofluid in the experimental setups and data such as collector inlet and outlet temperatures, ambient and tap water temperatures; radiation, humidity, and wind speed were measured and recorded. The obtained data were used to calculate efficiencies according to ASHRAE 93-2003 standards. When compared with water, the results indicated that the use of nanofluid increased collector efficiency.
  • Öğe
    A research on the fatigue strength of the single-lap joint joints bonded with nanoparticle-reinforced adhesive
    (Welding in the World, 2021-01) Adin, Hamit; Saraç, İsmail; Temiz, Şemsettin
    Nano-technological developments, which have made significant progress in recent years, have significant impact on the science of adhesives. Therefore, in our study, the static and fatigue strengths of single-lap joints (SLJs) incorporating nanoparticles were compared to those without nanoparticles. Steel plates were used in the adhesive joints. The results revealed that average damage load increased significantly in nanoparticle-reinforced adhesive joints. The highest damage load was obtained with 4 wt% nanoAl2O3 in epoxy adhesive. As the average damage load increased, the locus of damage changed from interfacial to the mixture of interfacial and cohesive. Also, fatigue strengths of the joints increased when the adhesive joint had nano-Al2O3 and nano-SiO2, and decreased when the adhesive joint had nano-TiO2.