Ömer Faruk Can

In this study thermal effects of hot and cold fluids on five teeth in the jawbone, one of which is the main tooth and other four are dental implants, are numerically investigated. Since a typical dental implant consists of an implant body, an abutment and a crown, the implant body and crown may be affected differently when they are made of different materials. Based on this reasoning, the cases where the implant body is made of titanium, zirconium, gold and cobalt and the crown is made of zirconium and porcelain are discussed numerically. It was considered as a positive criterion that the prosthetic implant duo, which was considered to be at body temperature at the beginning, were affected by the temperature under different thermal conditions. Therefore, as thermal conditions, the contact of cold (5 C) and hot (60 C) liquid beverages to the teeth and the effect of cold air (-10 C) contacting to the teeth with the breath taken in a cold air are examined. Numerical solutions are obtained by using commercial software ANSYS-CFX.

In this study, a numerical and experimental analysis of a solar collector with roughness elements in the form of stainless-steel scourers on the absorber surface is presented. According to the location type and number of the stainless steel scourers, the absorber surfaces are referred to as the complex surface (C1), less complex surface (C2), and flat surface (C3). A Computational Fluid Dynamics (CFD) analysis was carried out using ANSYS-CFX-R18.2 commercial software. The results were verified with the experimental study. After the numerical study was confirmation with the experimental study, then the detailed investigation was performed by numerical simulations. The extracted results of the numerical and experimental analysis concerned the air temperature and velocity, and thermal efficiency, which varied with respect to the type of collector. As a result, the C1 type yielded the highest air velocity and air temperature, while the lowest values of air velocity and temperature were recorded for the C3 type, according to both the numerical analysis and experimental tests. This trend was similar for the efficiencies. The efficiency was nearly 80% for collectors with stainless-steel scourers, whilst it was 55% for the flat plate collector. The results showed that the experimental and numerical results agreed well.

Pamukkale University Journal of Engineering Sciences

In this study, thermal performance of the forced cross-flow water cooling tower is numerically investigated by using the commercial computational fluid dynamics software ansys-cfx. The temperature variation between inlet and outlet of the water, namely, process water temperature, is the main extracted result of simulations. Additionally, the cooling range (CR) that is the difference between inlet water temperature and outlet water temperature is the second representative result of the analysis. The effect of air velocity (Va), water droplet diameter (dw), and water temperature at the inlet of tower (Tw) are the variables that are considered to be the effective design parameters on the process temperature of the water. The process water temperature decreases, but the cooling range increases when the air velocity increases. When the inlet water temperature increases, the process water temperature and the cooling range also increase. On the other hand, the process water temperature decreases with the decreasing diameter of water droplets.

Bu çalışmada Dicle Üniversitesi Mühendislik Fakültesinin rüzgâr ve sıcaklık etkileri nümerik olarak incelenmiştir. Çalışma 4 durumda ele alınmıştır. Sırasıyla rüzgârın güneydoğu (ön kısım), kuzeybatı (arka kısım), kuzeydoğu (sağ kısım) ve güney batı (sol kısım)’dan esmesi durumunda bina üzerindeki rüzgâr ve akış özellikleri incelenmiştir. Çalışma hesaplamalı akışkanlar dinamiği uygulamalarında sıklıkla kullanılan ANSYS CFX yazılım programı yardımıyla gerçekleştirilmiştir. Giriş kısmında rüzgâr hızı 40 m/s olarak alınmıştır. Giriş rüzgâr sıcaklığı 35 oC olarak verilmiştir. Rüzgâr yönlerinin tespit edilmesi için Google haritalar uygulaması yardımıyla binanın uydu görüntüleri alınmıştır. Bina yüzey sıcaklığı 25 oC olarak belirlemiştir. Bina boyutları için gerçek ölçüler kullanılmıştır. Çalışma sonunda 4 durum için hız konturları ve akım çizgileri elde edilmiştir. Ayrıca binanın orta noktasından geçen bir çizgi boyunca ortalama hız ve sıcaklık grafikleri verilmiştir.