Author
Karimzadehkhouei, M., Shojaeian, M., Sadaghiani, A. K., Şendur, K., Mengüç, Mustafa Pınar, Koşar, A.
Publication Date
2018-04
Publication Place
-
MDPI AG
Subject
Entropy generation, Heat transfer coefficient, TiO2 and Al2O3 nanoparticles, Carbon nanotubes, Nanofluid, Minitube
Type
Periodical
Language
English
Digital
Yes
Manuscript
No
Library
Özyeğin University
Library Asset ID
1099-4300
Record ID
6552fcff-18f7-4978-b1de-d06d38c25ccb
Library Location
Mechanical Engineering
Date
2018-04
Notes
Turkish Academy of Sciences (GEBIP Programme) ; SUNUM (Sabanci University Nanotechnology Research and Applications Center) ; Sabanci University Faculty of Engineering and Natural Science (FENS)
Sample Text
During the last decade, second law analysis via entropy generation has become important in terms of entropy generation minimization (EGM), thermal engineering system design, irreversibility, and energy saving. In this study, heat transfer and entropy generation characteristics of flows of multi-walled carbon nanotube-based nanofluids were investigated in horizontal minitubes with outer and inner diameters of ~1067 and ~889 µm, respectively. Carbon nanotubes (CNTs) with outer diameter of 10–20 nm and length of 1–2 µm were used for nanofluid preparation, and water was considered as the base fluid. The entropy generation based on the experimental data, a significant parameter in thermal design system, was examined for CNTs/water nanofluids. The change in the entropy generation was only seen at low mass fractions (0.25 wt.% and 0.5 wt.%). Moreover, to have more insight on the entropy generation of nanofluids based on the experimental data, a further analysis was performed on Al2O3 and TiO2 nanoparticles/water nanofluids from the experimental database of the previous study of the authors. The corresponding results disclosed a remarkable increase in the entropy generation rate when Al2O3 and TiO2 nanoparticles were added to the base fluid.
DOI
10.3390/e20040242
Cilt
20
