ELMAS-SU NANOAKIŞKANI KULLANILAN FARKLI KANATÇIK UZUNLUKLU VE AÇILI BİRLEŞİK JET AKIŞLI KANALLARDA ISI TRANSFERİNDEKİ İYİLEŞMENİN ANALİZ EDİLMESİ

Abstract

Especially in the energy-intensive industrial sector; attention is paid to ensure that all kinds of devices and equipment produced are systems with high energy efficiency and long life. The most important obstacle in front of this situation is the heating problem in technologically advanced devices. The combined application of the cross flow-impinging jet flow combined jet flow heat transfer method can create a high-capacity cooling method. In this study, heat transfer from the cube and hollow models was numerically investigated using water and Diamond-Water nanofluid in combined jet flow channels with 30o and 90o angled fins. The fins were located at a fixed N=1.5D distance from the impinging jet inlet to the channel; fin lengths were taken as K=D and K=2D. Numerical analysis was carried out by solving energy and Navier-Stokes equations with the k- turbulence model using the Ansys-Fluent program in three-dimensional and steady. While the upper and lower surfaces of the fin and channel are adiabatic; a constant heat flux of 1000 W/m2 was applied to the model surfaces. The Reynolds number range studied for fluids is 7000-11000. Thermophysical properties of Diamond-Water nanofluid with 2% volumetric concentration were obtained with the help of equations found in the literature. The results of the study were compared with the correlation obtained as a result of the experimental study in the literature and the results were found to be compatible. The results were analyzed as variations in the mean Nu number depending on the fin length for each cube and hollow model surface in the channels. In addition, velocity-streamline and temperature contour distributions of the Diamond-Water nanofluid were visualized for different fin angles (30o and 90o) and lengths (K=D and K=2D) at Re=11000. The mean Nu number (Nuort) and model surface temperature values (Tort) were evaluated comparatively in cases where K=D and K=2D at different Reynolds numbers and water and Diamond-Water nanofluids are used for all model surfaces in the channels. As a result, 80.35% and 90.03% increases in Nuort values were obtained for cube and hollow model surfaces, respectively, in the 90o angled and K=2D length finned channel using Diamond-Water nanofluid at Re=11000 compared to the channel without fin and using water fluid.