Nur Çobanoğlu

University of Padua · Department of Management and Engineering

The goal of this study is to investigate the performance of a Single-Phase Natural Circulation mini Loop (SPNCmL) operating under the influence of an external magnetic field (EMF). For this purpose, a numerical SPNCmL model working with Fe3O4 ferrofluids (1–3 vol%.) under the influence of an EMF is developed to reflect the effect of a NdFeB permane...

Okullar öğretmen ve çocukların evlerinden sonra en çok vakit geçirdikleri iç çevredir. Sınıflardaki iç hava kalitesi (İHK), öğrencilerin ve öğretmenin sağlık, konfor, akademik performans ve dikkat yeteneğini etkilemektedir. Bu nedenle sağlıklı bir ortam sağlamak için uygun bir havalandırma tasarımı oluşturmak çok önemlidir. Bu çalışma mekanik haval...

Sleep quality, which significantly affects daily life, is also affected by indoor air quality as well as comfort aspects such as noise, temperature, and relative humidity in the sleeping environment. Carbon dioxide concentration is commonly considered as an indicator of indoor air quality, and it has been observed that increasing concentrations inc...

Natural circulation loops with double pipe heat exchangers at heating and cooling ends have a potential to be used in the refrigeration systems as an alternative to suction line heat exchangers. The heat transfer capability of such natural circulation loops depends on the geometrical parameters as well as thermophysical properties of the working fl...

Televizyon, radyo ve basılı yayınları kapsayan medya kavramı, gelişen teknolojinin etkisiyle artan bilgisayar, tablet ve internet kullanımı ile yeni medya kavramına dönüşmüştür. Bu kavramın küreselleşmesinden sanatçılar da etkilenmiş; çağdaş sanatçılar hem melez bir üretim hem de sanat, teknoloji ve insanlar arasında bir etkileşim olan yeni medya s...

Bu kitap, iç çevre kalitesi (ses, ışık, ısıl konfor ve iç hava kalitesi) bileşenlerinin, uyku kalitesi ve ertesi gün sağlık ve zihinsel performansı üzerine günümüze kadar yapılan araştırmaların derlemesini ve değerlendirmesini içeren özgün çalışmalardan oluşmaktadır. Çalışmaların amacı, iç çevre parametrelerinin etkileri üzerine okuyucuya veyaşam a...

Single-Phase Natural Circulation Loops (SPNCLs) are well-known passive heat transfer systems in which the driving mechanism is resulting buoyancy forces of density gradient caused by temperature difference. Correct modelling of SPNCL is important for an accurate prediction of the heat transfer performance. In this study, the validation of the stead...

The contact angle of droplets attracts attention as one of the relevant thermo-physical properties describing the wettability behaviour of the fluids. The contact angle depends on the surface characteristics such as surface type and roughness as well as on the liquid type and surrounding atmosphere. This study aims to correct the error in the coeff...

Single phase natural circulation loops are widely used passive systems in heat transfer applications. Since achievement of stable flow and highly effi- cient heat transfer is the main concern of recent studies, effects of geometry and the working fluid on the single phase natural circulation loops’ perfor- mance are getting attention. In this study...

Growing number of household refrigerators and freezers also increase the overall energy consumption and number of household refrigerators have grown nearly 3% per year. On the other hand, investigations showed that household refrigerators have a significant technical energy saving potential of up to 30-40%. In this study, a single-phase natural cir...

Specifying nanofluids’ thermophysical properties correctly is crucial for correct interpretation of a system’s thermo-hydraulic performance and faster market-uptake of nanofluids. Although, experimental and theoretical studies have been conducted on nanofluids’ thermophysical properties; their order-of-magnitude change is still a matter of debate....

Wettability is the ability of the liquid to contact with the solid surface at the surrounding fluid and its degree is defined by contact angle (CA), which is calculated with balance between adhesive and cohesive forces on droplet surface. Thermophysical properties of the droplet, the forces acting on the droplet, atmosphere surrounding the droplet...

Droplet volume and temperature affect contact angle significantly. Phase change heat transfer processes of nanofluids – suspensions containing nanometre-sized particles – can only be modelled properly by understanding these effects. The approach proposed here considers the limiting contact angle of a droplet asymptotically approaching zero-volume a...

Renewable energy sources such as solar, wind and geothermal are proposed as an alternative to fossil fuels whose excessive use causes global warming. The most popular one of the renewable energy sources is considered as solar energy due to the fact that required energy is provided by the sun entire year around the world. Solar energy systems conver...