Akademik Veri Yönetim Sistemi
Tezin Türü: Yüksek Lisans
Tezin Yürütüldüğü Kurum: Erciyes Üniversitesi, Mühendislik Fakültesi, Makina Mühendisliği, Türkiye
Tezin Onay Tarihi: 2020
Tezin Dili: İngilizce
Öğrenci: Mohammed Ahmed Mousa AL-HAMEEDAWI
Danışman: Veysel Özceyhan
Özet:
In this study, several numerical simulations were constructed in order to enhance the
heat transfer performance by exploiting smooth and twisted tubes with three different pitch
lengths was (50mm, 100mm, 250mm). Water was selected as base fluid for analysis, and
the (CuO-Water) nano-fluids effect was tested on the heat transfer through a circular tube
in order to improve the thermal and hydraulic performances. The nano-fluid used was a
single-phase of four different volume fractions: 1, 2, 3, and 4%. The analysis
was experimented for Reynolds number values between 6000-40000. Constant uniform
heat flux of 50,000 W/m2 was applied to the outer surface of the test tube. Besides; kepsilon standard turbulence model was adopted through the use of CFD (ANSYS)
program. The inlet fluid temperature was taken as 293K and a constant hydraulic diameter
of 26.9mm was considered. The optimum results (Nu = 443.76, h=12129.98 W/m2
, f =
0.1582, ∆p = 2782.85 Pa, PEC=2.39) obtained were at pitch length of 50 mm, Reynolds
number of 35613 and volume fraction of 4% (CuO-Water) in base fluid.
Finally, The results in terms of thermal and hydraulic performances showed decreasing
Nusselt number, heat transfer coefficient, friction factor and pressure as the number of
pitches length in twisted tube increased. In addition, the thermal and hydraulic
characteristics increased too when increasing the value of CuO-water nano-fluid fraction.