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Numerical Heat Transfer, Part A: Applications
An International Journal of Computation and Methodology
Volume 79, 2021 - Issue 4
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Original Articles

Enhancement of the turbulent convective heat transfer in channels through the baffling technique and oil/multiwalled carbon nanotube nanofluids

Younes Mennia Unit of Research on Materials and Renewable Energies, Department of Physics, Faculty of Sciences, Abou Bekr Belkaid University, Tlemcen, AlgeriaORCID Iconhttps://orcid.org/0000-0003-1475-3743
ORCID Icon,
Ali J. Chamkhab Faculty of Engineering, Kuwait College of Science and Technology, Doha District;c Center of Excellence in Desalination Technology, King Abdulaziz University, Jeddah, Saudi ArabiaCorrespondence[email protected] [email protected]
ORCID Iconhttps://orcid.org/0000-0002-8335-3121
ORCID Icon,
Mahyar Ghazvinid Department of Ocean and Mechanical Engineering, Florida Atlantic University, Boca Raton, USAORCID Iconhttps://orcid.org/0000-0002-3647-2101
ORCID Icon,
Mohammad Hossein Ahmadie Faculty of Mechanical Engineering, Shahrood University of Technology, IranCorrespondence[email protected] [email protected]
ORCID Iconhttps://orcid.org/0000-0002-0097-2534
ORCID Icon,
Houari Ameurf Department of Technology, University Centre of Naama, AlgeriaORCID Iconhttps://orcid.org/0000-0003-2087-7574
ORCID Icon,
Alibek Issakhovg Faculty of Mechanics and Mathematics, Department of Mathematical and Computer Modelling, Al-Farabi Kazakh National University, Almaty, Kazakhstan
&
Mustafa Inch Department of Mathematics, Science Faculty, Firat University, Elazig, Turkey;i Department of Medical Research, China Medical University Hospital, Taichung, Taiwan, Republic of ChinaORCID Iconhttps://orcid.org/0000-0003-4996-8373
ORCID Icon show all
Pages 311-351 | Received 15 Sep 2020, Accepted 22 Oct 2020, Published online: 08 Dec 2020
 
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Abstract

An attempt is made to improve the overall performances of channel heat exchangers. The techniques of baffles and nanofluids are combined to enhance the dynamic and thermal behaviors within the channel exchanger. Baffles under various attack angles are used as vortex generators. In addition, oil/multiwalled carbon nanotubes (MWCNT) is used as a working fluid. Both inclinations in the upstream and downstream directions were considered, referenced as Case A (UIB) and Case B (BIB), respectively. While the channel equipped with vertical baffles is referenced as Case C. The proposed models with combined techniques allowed a considerable enhancement in the overall efficiency. The comparison between the three cases revealed that the most significant value of thermal enhancement factor (TEF) of 5.634 was reached with vertical baffles (Case C) at the highest value of Reynolds number. When using inclined baffles, the 75° upstream attack angle (Case A) allowed the highest TEF of 4.814, compared with Case B.

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