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Nanofluids Heat Transfer II
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Nanofluids Heat Transfer II

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "J1: Heat and Mass Transfer".

Deadline for manuscript submissions: 5 June 2024 | Viewed by 2604

Special Issue Editors

Dr. Annunziata D'Orazio

E-Mail Website
Guest Editor
Department of Astronautical, Electrical and Energy Engineering, Sapienza University of Rome, Via Eudossiana 18, 00184 Roma, Italy
Interests: Lattice Boltzmann modeling; heat transfer; thermodynamics; indoor air quality; airborne contamination; HVAC systems; radiation; UV; health; healthcare technological systems; Hospital environment; heat pumps; Energy savings
Special Issues, Collections and Topics in MDPI journals
Dr. Arash Karimipour

E-Mail Website
Guest Editor
Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad 8514143131, Iran
Interests: heat transfer; thermal fluid dynamics; nanofluids—thermophysical properties; Newtonian and non-Newtonian nanofluids; lattice Boltzmann methods
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Nanofluid technologies have been identified as a solution to the problem of the rapid escalation of the heat dissipation rate, which has been observed in a wide range of applications in recent decades, for example, due to the micro- and nanominiaturization of computer electronic components, not least in medical devices, in addition to potentially addressing the requests for energy conservation.

In general, the suspension of nanometric particles in base fluids improves the efficiency of heat transfer. However, there is discussion about the experimental results for the transport properties or for the convective behavior of the nanofluids. The complete understanding of all physical mechanisms related to the behavior of these fluids, and of their overlap, is still an open issue.

In order to understand how effects related to the nanoscale could influence the macroscopic transport behavior of nanofluids, researchers are studying the stability of these solutions, including the thermal and rheological properties, convective heat transfer, and hydrodynamic behaviors of a large variety of nanoparticles (in the case of one type of particle or hybrid nanofluids) in different base fluids.

A great deal of effort is being devoted to theoretical and numerical models of the interaction mechanisms and of different physical contributions (thermophoretic diffusion, Brownian motion, effects of the wall region, effects of size and shape, etc.), and currently, several coexisting approaches are used to describe nanofluids (for example, phase and two-phase models). Multiscale approaches have attempted to fully describe the complexity of nanofluids.

We therefore invite papers on the theoretical, experimental, and numerical results of the thermal behavior of nanofluids, review papers, and papers of analysis, discussion, and assessment.

Topics of interest for publication include, but are not limited to:

  • Thermophysical properties;
  • Natural, mixed, forced convection in nanofluids;
  • Conductive, convective, radiative heat transfer;
  • Rheological characteristics of nanofluids;
  • Hybrid nanofluids;
  • Thermohydraulics of nanofluids;
  • Heat transfer by nanofluids through porous media and microchannels;
  • Convection heat transfer inside cavities filled with nanofluids;
  • Fouling and clustering of nanoparticles;
  • Shape effects;
  • Magnetic field effects;
  • Micro-, meso-, and macro-scale modeling approaches;
  • Lattice Boltzmann methods.

Dr. Annunziata D'Orazio
Dr. Arash Karimipour
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

  • thermophysical properties
  • natural, mixed, forced convection in nanofluids
  • conductive, convective, radiative heat transfer
  • rheological characteristics of nanofluids
  • hybrid nanofluids
  • thermohydraulics of nanofluids
  • heat transfer by nanofluids through porous media and microchannels
  • convection heat transfer inside cavities filled with nanofluids
  • fouling and clustering of nanoparticles
  • shape effects
  • magnetic field effects
  • micro-, meso-, and macro-scale modeling approaches
  • lattice Boltzmann methods

Published Papers (3 papers)

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Research

18 pages, 3525 KiB  
Article
Utilization of H2O/CuO and Syltherm 800/CuO Nanofluids in a Concentrating Solar Collector with Photovoltaic Elements
by Theodoros Papingiotis, Dimitrios N. Korres, Irene Koronaki and Christos Tzivanidis
Energies 2024, 17(3), 576; https://doi.org/10.3390/en17030576 - 24 Jan 2024
Viewed by 548
Abstract
This study examined the performance of a concentrating solar collector with an asymmetric reflector. Two receivers were investigated, differing in the presence of photovoltaic cells. The first one was equipped with cells on both sides while the other was without cells. The analysis [...] Read more.
This study examined the performance of a concentrating solar collector with an asymmetric reflector. Two receivers were investigated, differing in the presence of photovoltaic cells. The first one was equipped with cells on both sides while the other was without cells. The analysis was performed using a numerical model that integrates a combination of three-dimensional optical and thermal analyses developed in COMSOL. The investigation included studying the influence of CuO/water and CuO/Syltherm 800 nanofluids on the thermal performance for the receiver without photovoltaic elements, as well as on both thermal and electrical efficiencies for the hybrid receiver. Two volumetric concentrations of CuO in water and Syltherm 800, 3% and 5%, were explored with varying inlet temperatures, ranging from 20 °C to 80 °C for the hybrid solar unit and from 20 °C to 140 °C for the thermal solar unit. The outcomes of the examination were compared between the nanofluids and the pure base fluid. Properly pressurized water was considered in the case without photovoltaic elements. Full article
(This article belongs to the Special Issue Nanofluids Heat Transfer II)
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10 pages, 16246 KiB  
Article
Enhancing the Power Performance of Latent Heat Thermal Energy Storage Systems: The Adoption of Passive, Fractal Supports
by Giorgio Amati, Sauro Succi and Giacomo Falcucci
Energies 2023, 16(19), 6764; https://doi.org/10.3390/en16196764 - 22 Sep 2023
Viewed by 704
Abstract
We employ a three-phase thermal lattice Boltzmann model (LBM) to investigate the power performance of latent heat thermal energy storage (LHTES) systems based on the exploitation of phase change materials (PCMs). Different passive thermal supports are considered to increase the melting rate, including [...] Read more.
We employ a three-phase thermal lattice Boltzmann model (LBM) to investigate the power performance of latent heat thermal energy storage (LHTES) systems based on the exploitation of phase change materials (PCMs). Different passive thermal supports are considered to increase the melting rate, including innovative, fractal, branch-like structures. Our simulations reveal that the adoption of fractal, branch-like metal supports consistently outperforms other configurations in terms of PCM melting rates. These results open the path towards novel strategies to enhance the power performance of PCM-based TES systems, offering potential benefits for energy storage applications. Full article
(This article belongs to the Special Issue Nanofluids Heat Transfer II)
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20 pages, 6489 KiB  
Article
Preliminary Results of Heat Transfer and Pressure Drop Measurements on Al2O3/H2O Nanofluids through a Lattice Channel
by Sandra Corasaniti, Michele Potenza and Ivano Petracci
Energies 2023, 16(9), 3835; https://doi.org/10.3390/en16093835 - 29 Apr 2023
Viewed by 907
Abstract
A nanofluid is composed of a base fluid with a suspension of nanoparticles that improve the base fluid’s thermophysical properties. In this work, the authors have conducted experimental tests on an alumina-based nanofluid (Al2O3/H2O) moving [...] Read more.
A nanofluid is composed of a base fluid with a suspension of nanoparticles that improve the base fluid’s thermophysical properties. In this work, the authors have conducted experimental tests on an alumina-based nanofluid (Al2O3/H2O) moving inside a 3D-printed lattice channel. The unit cell’s lattice shape can be considered a double X or a double pyramidal truss with a common vertex. The test channel is 80 mm long and has a cross-sectional area, without an internal lattice with that has the dimensions H × W, with H = 5 mm and W = 15 mm. A nanofluid and a lattice duct can represent a good compound technique for enhancing heat transfer. The channel is heated by an electrical resistance wound onto its outer surface. The heat transfer rate absorbed by the nanofluid, the convective heat transfer coefficients, and the pressure drops are evaluated. The experimental tests are carried out at various volumetric contents of nanoparticles (φ = 1.00%, φ = 1.50% and φ = 2.05%) and at various volumetric flow rates (from 0.2 L/min to 2 L/min). The preliminary results show that in the range between 0.5 L/min ÷ 2.0 L/min, the values of convective heat transfer coefficients are greater than those of pure water (φ = 0) for all concentrations of Al2O3; thus, the nanofluid absorbed a higher thermal power than the water, with an average increase of 6%, 9%, and 14% for 1.00%, 1.50% and 2.05% volume concentrations, respectively. The pressure drops are not very different from those of water; therefore, the use of nanofluids also increased the cooling efficiency of the system. Full article
(This article belongs to the Special Issue Nanofluids Heat Transfer II)
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