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Advances in Nanofluids and Turbulators for Heat Transfer Enhancement

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "J: Thermal Management".

Deadline for manuscript submissions: closed (20 January 2022) | Viewed by 5743

Special Issue Editors

Department of Sustainable and Renewable Energy Engineering, University of Sharjah, Sharjah P. O. Box 27272, United Arab Emirates
Interests: renewable energy; energy and exergy analysis; solar energy (solar collectors, energy efficiency, efficiency improvement); heat transfer (heat transfer, cooling, and heating); nanofluids (thermophysical properties, optical properties, application of nanofluids); nano enhanced pcm; nanolubricants; nanorefrigerants; polygeneration; energy storage; artificial intelligence; machine learning; optimization
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Guest Editor
Thermal Department, School of Mechanical Engineering, National Technical University of Athens, Zografou, Heroon Polytechniou 9, 15780 Athens, Greece
Interests: solar thermal concentrating collectors; organic rankine cycle; energy in buildings; heat pumps; energy storage
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The economic efficiency of energy conversion systems is directly affected by improving heat transfer and has therefore become a critical subject of interest in recent years. Two methods are employed, the passive and active methods, to improve the heat transfer rate without decreasing and affecting the energy efficiency of energy conversion systems. Out of the two mentioned methods, the passive method is more reliable and cost-effective due to the lack of moving parts. Therefore, to enhance the heat transfer performances of energy conversion systems, several researchers have reported studies where they have combined passive methods. This Special Issue focuses on such combined passive methods employing nanofluids (mono and hybrid—suspending particles, which improves the thermal conductivity of conventional heat transfer fluids) and inserts (wire coil, vortex generators, twisted tapes, and baffles, which can promote turbulence in the fluid to improve thermal efficiency), to improve the heat transfer of energy conversion systems, as well as reducing CO2 emissions and resulting in energy saving. 

Hybrid nanomaterials are remarkably interesting and worth studying due to their synthesis, modeling, and applications because of their synergistic properties. Nanofluids (mono or hybrid) have shown better thermal characteristics and stability compared to conventional heat transfer fluids, thus making them the best candidates for many thermal applications, such as solar thermal systems, automotive cooling systems, heat sinks, thermal energy storage, etc. However, using nanofluids and turbulators may result in increased pressure drop; therefore, it is necessary to calculate the overall heat transfer coefficient and experimentally investigate whether this approach is beneficial or not. Therefore, understanding the fundamentals of heat transfer, friction factor, and pressure drop is significant for establishing nanofluids heat transfer fluids for a wide range of engineering applications. There is a significant gap in research on nanofluids to develop mathematical models that could be used to predict thermophysical properties. This Special Issue is focused on evaluating the idiosyncratic behavior of mono and hybrid nanofluids and turbulators along with their applications in various energy systems for heat transfer enhancement.

Dr. Evangelos Bellos
Prof. Zafar Said
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Nanofluids
  • Energy system
  • Renewable energy systems
  • Heat transfer enhancement
  • Thermophysical properties
  • Exergy analysis
  • Economic and environmental impact
  • Modeling and optimization
  • Life cycle analysis
  • Hybrid nanofluids

Published Papers (2 papers)

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Research

14 pages, 8644 KiB  
Article
Numerical Study of (Au-Cu)/Water and (Au-Cu)/Ethylene Glycol Hybrid Nanofluids Flow and Heat Transfer over a Stretching Porous Plate
by Umair Rashid, Azhar Iqbal and Abdullah Alsharif
Energies 2021, 14(24), 8341; https://doi.org/10.3390/en14248341 - 10 Dec 2021
Cited by 4 | Viewed by 1668
Abstract
The purpose of the study is to investigate the (Au-Cu)/Water and (Au-Cu)/Ethylene glycol hybrid nanofluids flow and heat transfer through a linear stretching porous plate with the effects of thermal radiation, ohmic heating, and viscous dissipation. Similarity transformations technique is used to transform [...] Read more.
The purpose of the study is to investigate the (Au-Cu)/Water and (Au-Cu)/Ethylene glycol hybrid nanofluids flow and heat transfer through a linear stretching porous plate with the effects of thermal radiation, ohmic heating, and viscous dissipation. Similarity transformations technique is used to transform a governing system of partial differential equations into ordinary differential equations. The NDSolve Mathematica program is used to solve the nonlinear ordinary differential equations. Furthermore, the results are compared with the results of homotopy analysis method. The impacts of relevant physical parameters on velocity, temperature, and the Nusselt number are represented in graphical form. The key points indicate that the temperature of (Au-Cu)/water and (Au-Cu)/Ethylene glycol hybrid nanofluids is increased with the effects of Eckert number and magnetic field. The (Au-Cu)/Ethylene glycol hybrid nanofluid also has a greater rate of heat transfer than (Au-Cu)/Water hybrid nanofluid. Full article
(This article belongs to the Special Issue Advances in Nanofluids and Turbulators for Heat Transfer Enhancement)
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26 pages, 4335 KiB  
Article
Synthesis and Application of Ternary Nanofluid for Photovoltaic-Thermal System: Comparative Analysis of Energy and Exergy Performance with Single and Hybrid Nanofluids
by Humphrey ADUN, Mustapha Mukhtar, Micheal Adedeji, Terfa Agwa, Kefas Hyelda Ibrahim, Olusola Bamisile and Mustafa Dagbasi
Energies 2021, 14(15), 4434; https://doi.org/10.3390/en14154434 - 22 Jul 2021
Cited by 37 | Viewed by 2695
Abstract
The amelioration of photovoltaic (PV) and photovoltaic/thermal (PV/T) systems have garnered increased research interest lately, more so due to the discovery of the thermal property augmentation of nanofluids. The overarching goal of this study is to conduct a comparative analysis of mono, hybrid, [...] Read more.
The amelioration of photovoltaic (PV) and photovoltaic/thermal (PV/T) systems have garnered increased research interest lately, more so due to the discovery of the thermal property augmentation of nanofluids. The overarching goal of this study is to conduct a comparative analysis of mono, hybrid, and ternary hybrid nanofluids utilized as fluids for heat transfer applications and particularly as cooling mediums in PV/T applications. Al2O3, ZnO, Al2O3-ZnO, and Al2O3-ZnO-Fe3O4 nanofluids are synthesized at 1% volume concentration using the two-step method. The zeta potential tests carried out showed that the fluids have high stability. The numerical model developed in this study was validated using real data culled from Cyprus International University. The findings in this study showed that the Al2O3-ZnO-Fe3O4 ternary hybrid nanofluid and ZnO mono nanofluid were more efficient heat transfer fluids for the PV/T system. The optimum relative electrical PV/T efficiency against that of the PV is 8.13% while the electrical and thermal enhancement recorded in this study was 1.79% and 19.06%, respectively, measured for the ternary hybrid nanofluid based PV/T system. This present study shows that despite the limitation of pumping power and pressure drop associated with nanofluid in thermal systems, the close performance evaluation criterion values as compared with water is positive for practical utilization of nanofluid in PV/T systems. Full article
(This article belongs to the Special Issue Advances in Nanofluids and Turbulators for Heat Transfer Enhancement)
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