Special Issue "Nanofluids and Nanofluidics"

A special issue of Nanomaterials (ISSN 2079-4991).

Deadline for manuscript submissions: 30 November 2020.

Special Issue Editor

Prof. S. M. Sohel Murshed
Website
Guest Editor
Professor of Thermofluids and Energy Conversion Technologies, Department of Mechanical Engineering, Instituto Superior Tecnico, University of Lisbon, 1049-001 Lisbon, Portugal
Interests: Nanofluids, nanomaterials, microfluidics, nanofluidics, cooling and energy technologies, thermophysical properties and thermal transport

Special Issue Information

Dear Colleagues,

Both nanofluids and nanofluidics are popular research fields that have attracted huge research interest in recent years. This is mainly due to their great potential applications in many important fields ranging from energy and electronics to biomedical. While nanofluids are suspensions of any kind of solid nanoparticles in any conventional or new heat transfer liquids, nanofluidics is the study and manipulation of fluids confined within nano-sized structures or devices. It is known that the current technological trend towards being smaller and faster raises a lot of technical challenges. For instance, small and high performance devices also generate very high power (heat) densities, and conventional cooling techniques are increasingly falling short of meeting these high and fast cooling needs. Here nanofluids and nanofluidics can play a major role in overcoming such challenges (e.g., cooling) of high-tech small devices and systems. In addition to the huge potential markets, there are also numerous other technological challenges facing many other fields (like drag-delivery in biomedical) where either nanomaterials, nanofluids or nanofluidics can be a game changer in the future.

Due to this importance and the potential applications, it is timely to cover some major research and application areas of these two popular fields in this Special Issue on “Nanofluids and Nanofluidics” in Nanomaterials which is a high-impact (IF:3.504) journal in nanoscience and nanotechnology.

Prof. S. M. Sohel Murshed
Guest Editor

Manuscript Submission Information

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Keywords

  • Nanofluids
  • Energy and cooling applications of nanofluids
  • Thermal transport of nanofluids
  • Nanofluidics
  • Applications of nanofluidics, Lab-on- a-chip
  • Fabrication of nanofluidic devices
  • Nanofluidics for new nanomaterials

Published Papers (4 papers)

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Research

Open AccessArticle
Electrical Conductivity of New Nanoparticle Enhanced Fluids: An Experimental Study
Nanomaterials 2019, 9(9), 1228; https://doi.org/10.3390/nano9091228 - 29 Aug 2019
Cited by 1
Abstract
In this research, the electrical conductivity of simple and hybrid nanofluids containing Al2O3, TiO2 and SiO2 nanoparticles and water as the base fluid was experimentally studied at ambient temperature and with temperature variation in the range of [...] Read more.
In this research, the electrical conductivity of simple and hybrid nanofluids containing Al2O3, TiO2 and SiO2 nanoparticles and water as the base fluid was experimentally studied at ambient temperature and with temperature variation in the range of 20–60 °C. A comparison of the experimental data with existing theoretical models demonstrated that the theoretical models under-predict the experimental data. Consequently, several correlations were developed for nanofluid electrical conductivity estimation in relation to temperature and volume concentration. The electrical conductivity of both simple and hybrid nanofluids increased linearly with both volume concentration and temperature upsurge. More precisely, by adding nanoparticles to water, the electrical conductivity increased from 11 times up to 58 times for both simple and hybrid nanofluids, with the maximum values being attained for the 3% volume concentration. Plus, a three-dimensional regression analysis was performed to correlate the electrical conductivity with temperature and volume fraction of the titania and silica nanofluids. The thermo-electrical conductivity ratio has been calculated based on electrical conductivity experimental results and previously determined thermal conductivity. Very low figures were noticed. Concluding, one may affirm that further experimental work is needed to completely elucidate the behavior of nanofluids in terms of electrical conductivity. Full article
(This article belongs to the Special Issue Nanofluids and Nanofluidics)
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Open AccessArticle
Effect of Carbon Nanoparticles on the Crystallization of Calcium Carbonate in Aqueous Solution
Nanomaterials 2019, 9(2), 179; https://doi.org/10.3390/nano9020179 - 01 Feb 2019
Cited by 2
Abstract
Nanofluids have great application prospects in industrial heat exchange systems because they can significantly improve the heat and mass transfer efficiency. However, the presence of nanoparticles in the fluid might also affect the formation and attachment of inorganic scales, such as calcium carbonate, [...] Read more.
Nanofluids have great application prospects in industrial heat exchange systems because they can significantly improve the heat and mass transfer efficiency. However, the presence of nanoparticles in the fluid might also affect the formation and attachment of inorganic scales, such as calcium carbonate, on the heat exchange surface. The effects of carbon nanoparticles on the crystallization of calcium carbonate in aqueous solution were studied by the scale inhibition test, solution analysis, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FTIR). The results showed that carbon nanoparticles had an excellent surface scale inhibition performance for calcium carbonate, which could effectively prevent the adhesion of scale on the heat exchange surface. The carbon nanoparticles did not affect the solubility of calcium carbonate in water, but changed the crystal form of the precipitated calcium carbonate, making it difficult to adsorb on the heat exchange surface and achieving a surface scale inhibition effect. Carbon nanofluids effectively inhibit the adhesion of calcium carbonate to heat exchange surfaces. Full article
(This article belongs to the Special Issue Nanofluids and Nanofluidics)
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Open AccessArticle
Influence of Six Carbon-Based Nanomaterials on the Rheological Properties of Nanofluids
Nanomaterials 2019, 9(2), 146; https://doi.org/10.3390/nano9020146 - 24 Jan 2019
Cited by 10
Abstract
Nanofluids, dispersions of nanosized solid particles in liquids, have been conceived as thermally-improved heat transfer fluids from their conception. More recently, they have also been considered as alternative working fluids to improve the performance of direct absorption solar thermal collectors, even at low [...] Read more.
Nanofluids, dispersions of nanosized solid particles in liquids, have been conceived as thermally-improved heat transfer fluids from their conception. More recently, they have also been considered as alternative working fluids to improve the performance of direct absorption solar thermal collectors, even at low nanoadditive concentrations. Carbon-based nanomaterials have been breaking ground in both applications as nanoadditives during the last decade due to their high thermal conductivities and the huge transformation of optical properties that their addition involves. In any application field, rheological behavior became a central concern because of its implications in the pumping power consumption. In this work, the rheological behavior of four different loaded dispersions (0.25, 0.50, 1.0, and 2.0 wt%) of six carbon-based nanomaterials (carbon black, two different phase content nanodiamonds, two different purity graphite/diamond mixtures, and sulfonic acid-functionalized graphene nanoplatelets) in ethylene glycol:water mixture 50:50 vol% have been analysed. For this purpose, a rotational rheometer with double cone geometry was employed, which included a special cover to avoid mass losses due to evaporation at elevated temperatures. The flow curves of the twenty-four nanofluids and the base fluid were obtained by varying the shear rate between 1 and 1000 s−1 for seven different temperatures in the range from 283.15 to 353.15 K. The shear-thinning behaviors identified, as well as their dependences on carbon-based nanomaterial, concentration, and temperature, were analyzed. In addition, oscillatory tests were performed for samples with the clearest Non-Newtonian response, varying the deformation from 0.1 to 1000% with constant frequency and temperature. The dependence of the behaviors identified on the employed carbon-based nanomaterial was described. Full article
(This article belongs to the Special Issue Nanofluids and Nanofluidics)
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Open AccessArticle
Evaluation of the Stability of Dielectric Nanofluids for Use in Transformers under Real Operating Conditions
Nanomaterials 2019, 9(2), 143; https://doi.org/10.3390/nano9020143 - 23 Jan 2019
Cited by 6
Abstract
The application of nanotechnology to the electrical insulation of transformers has become a topic of interest in the last few years. Most authors propose the use of dielectric nanofluids, which are obtained by dispersing low concentrations of nanoparticles in conventional insulating liquids. Although [...] Read more.
The application of nanotechnology to the electrical insulation of transformers has become a topic of interest in the last few years. Most authors propose the use of dielectric nanofluids, which are obtained by dispersing low concentrations of nanoparticles in conventional insulating liquids. Although a good number of works have demonstrated that dielectric nanofluids may exhibit superior dielectric properties than the base fluids, there is a key issue that still needs to be addressed, which is the long-term stability of those liquids. The studies about the stability of dielectric nanofluids fluids that have been published so far analyze the performance of the fluids under laboratory conditions which are far from the real working conditions the liquids would be subjected to when working inside a transformer. In this paper, an experimental study is presented that evaluates the stability of several dielectric nanofluids under realistic transformer operating conditions. As the study demonstrates, the stability of dielectric nanofluids depends strongly on the working temperature, on the materials applied to obtain the fluid, and on the manufacturing procedure, while other aspects, such as the interaction with other materials, are less relevant. Additional topics, such as the methods applied for evaluation of the stability and the physical properties of the dielectric nanofluids under test, are discussed in the paper as well. Full article
(This article belongs to the Special Issue Nanofluids and Nanofluidics)
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