Erdem ÇİFTÇİ, Adnan SÖZEN, Esra KARAMAN.

TiO2 İçeren Nanoakışkan Kullanımının Isı Borusu Performansına Etkisinin Deneysel Olarak İncelenmesi

Bu çalışma ile nano boyutta TiO2 (Titanyum dioksit) parçacıkları içeren nanoakışkan kullanılarak çift fazlı kapalı bir termosifonun (ısı borusu) ısıl performansının iyileştirilmesi amaçlanmıştır. Çalışmada kullanılan ısı borusu 1 m uzunluğunda, iç ve dış çapı sırasıyla 13 mm ve 15 mm olan bakır bir borudur. Isı borusunun 400 mm’lik kısımları yoğuşma ve buharlaşma bölgelerini, geriye kalan 200 mm’lik kısmı ise adyabatik bölgeyi oluşturmaktadır. Yapılan deneysel çalışmada ısı borusunun toplam hacminin 1/3’lük kısmı iş akışkanı ile doldurulmuştur. Yoğuşma bölümünden çekilen ısıyı saptamak amacıyla 3 farklı soğutma suyu debisi (5 g/s, 7.5 g/s ve 10 g/s) ve buharlaşma bölgesi için 3 farklı ısıtıcı gücü (200 W, 300 W ve 400 W) kullanılarak deneyler tamamlanmıştır. Deneyler su ve nanoakışkan için ayrı ayrı yapılarak elde edilen sonuçlar karşılaştırılmıştır. En iyi sonuç, ısıl performansta %16.5 oranında iyileşme sağlayan, iş akışkanı olarak nanoakışkanın kullanıldığı 200 W ısıtıcı gücü ve 5 g/s soğutma suyu debisinde elde edilmiştir.

Experimental Investigation of Nano fluid Usage Including TiO2 on The Effect of Heat Pipe Performance

By this study, it is aimed to improve the thermal performance of the two phase closed thermosyphon (TPCT) using nano fluid that contains TiO2 particles. The heat pipe utilizing in this work had 1 m length. Its inner and outer diameters were 13 mm and 15 mm, respectively. While both the evaporator and the condenser sections had 400 mm length, the rest 200 mm length of the pipe consisted of adiabatic section. In experimental study performed, one third of the overall volume of the heat pipe was filled with working fluid. In order to determine the heat amount extracting from the condenser section, 3 different mass flow rates of cooling water (5 g/s, 7.5 g/s and 10 g/s) was used. The experiments, in addition, were completed for 3 varied heater power (200 W, 300 W and 400 W) for evaporating the working fluid. They were conducted separately not merely for the water, but also the nano fluid and the findings were compared to each other. The best result was acquired from the experiment in which working fluid was nano fluid with the cooling water mass flow rate of 5 g/s and 200 W heater power.

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