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Article

Entropy Generation Analysis of Laminar Flows of Water-Based Nanofluids in Horizontal Minitubes under Constant Heat Flux Conditions

1
Mechatronics Engineering Program, Faculty of Engineering and Natural Sciences, Sabanci University, Tuzla, Istanbul 34956, Turkey
2
Center of Excellence for Functional Surfaces and Interfaces for Nano Diagnostics (EFSUN), Sabanci University Nanotechnology and Applications Center (SUNUM), Sabanci University, Tuzla, Istanbul 34956, Turkey
3
Department of Mechanical Engineering, Ozyegin University, Cekmekoy, Istanbul 34782, Turkey
*
Author to whom correspondence should be addressed.
Entropy 2018, 20(4), 242; https://doi.org/10.3390/e20040242
Received: 12 February 2018 / Revised: 9 March 2018 / Accepted: 21 March 2018 / Published: 2 April 2018
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. View Full-Text
Keywords: entropy generation; heat transfer coefficient; TiO2 and Al2O3 nanoparticles; carbon nanotubes; nanofluid; minitube entropy generation; heat transfer coefficient; TiO2 and Al2O3 nanoparticles; carbon nanotubes; nanofluid; minitube
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MDPI and ACS Style

Karimzadehkhouei, M.; Shojaeian, M.; Sadaghiani, A.K.; Şendur, K.; Mengüç, M.P.; Koşar, A. Entropy Generation Analysis of Laminar Flows of Water-Based Nanofluids in Horizontal Minitubes under Constant Heat Flux Conditions. Entropy 2018, 20, 242. https://doi.org/10.3390/e20040242

AMA Style

Karimzadehkhouei M, Shojaeian M, Sadaghiani AK, Şendur K, Mengüç MP, Koşar A. Entropy Generation Analysis of Laminar Flows of Water-Based Nanofluids in Horizontal Minitubes under Constant Heat Flux Conditions. Entropy. 2018; 20(4):242. https://doi.org/10.3390/e20040242

Chicago/Turabian Style

Karimzadehkhouei, Mehrdad, Mostafa Shojaeian, Abdolali K. Sadaghiani, Kürşat Şendur, M. P. Mengüç, and Ali Koşar. 2018. "Entropy Generation Analysis of Laminar Flows of Water-Based Nanofluids in Horizontal Minitubes under Constant Heat Flux Conditions" Entropy 20, no. 4: 242. https://doi.org/10.3390/e20040242

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