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Nanomaterials
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Impact of Nanofluid on Heat Transfer
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Impact of Nanofluid on Heat Transfer

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Synthesis, Interfaces and Nanostructures".

Deadline for manuscript submissions: closed (30 November 2022) | Viewed by 7889

Special Issue Editor

Prof. Dr. Mohamed El-Sayed Ali

E-Mail Website
Guest Editor
Mechanical Engineering Department, King Saud University, Riyadh 11421, Saudi Arabia
Interests: convection heat transfer; nanofluid heat transfer; natural insulating material and stretching plate theory

Special Issue Information

Dear Colleagues,

Nanofluids have been reported as a good carrier for heat transfer better than base fluids. In this special issue, we would like to stress on the effect or impact of nanofluids on heat transfer in all applications such as (but not limited to) the following topics: solar thermal systems, heat pipes, heat exchangers, car cooling systems, energy storage, impinging liquid jet cooling heat transfer, heat transfer in enclosures, and heat sinks. Experimental and numerical research focus on using nanofluids in any heat transfer applications are welcome. Any characterization for developing the thermo physical properties such as thermal conductivity, viscosity, density and specific heat towards enhancing the heat transfer are also welcome. Application of nanofluids for forced, natural and mixed convection heat transfer in any thermal system are also appreciated. Stability of nanofluids in different base fluids and how to control them and the effect of that on heat transfer in any thermal system are also covered. Comparison between different kinds of nanofluids on heat transfer are also interested.

Prof. Dr. Mohamed El-Sayed Ali
Guest Editor

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Keywords

  • Nanofluids impinging liquid jet heat transfer
  • Nanofluids car cooling system
  • Heat exchangers using nanofluids
  • Solar collector and systems using nanofluids
  • Nanofluids in enclosures
  • Heat pipes using nanofluids
  • Application of nanofluids in energy storage
  • Heat sinks using nanofluids

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Published Papers (4 papers)

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Research

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15 pages, 2193 KiB  
Article
Effect of Thermal Radiation on Three-Dimensional Magnetized Rotating Flow of a Hybrid Nanofluid
by Adnan Asghar, Liaquat Ali Lund, Zahir Shah, Narcisa Vrinceanu, Wejdan Deebani and Meshal Shutaywi
Nanomaterials 2022, 12(9), 1566; https://doi.org/10.3390/nano12091566 - 5 May 2022
Cited by 38 | Viewed by 2003
Abstract
The effect of thermal radiation on the three-dimensional magnetized rotating flow of a hybrid nanofluid has been numerically investigated. Enhancing heat transmission is a contemporary engineering challenge in a range of sectors, including heat exchangers, electronics, chemical and biological reactors, and medical detectors. [...] Read more.
The effect of thermal radiation on the three-dimensional magnetized rotating flow of a hybrid nanofluid has been numerically investigated. Enhancing heat transmission is a contemporary engineering challenge in a range of sectors, including heat exchangers, electronics, chemical and biological reactors, and medical detectors. The main goal of the current study is to investigate the effect of magnetic parameter, solid volume fraction of copper, Eckert number, and radiation parameter on velocity and temperature distributions, and the consequence of solid volume fraction on declined skin friction and heat transfer against suction and a stretching/shrinking surface. A hybrid nanofluid is a contemporary type of nanofluid that is used to increase heat transfer performance. A linear similarity variable is–applied to convert the governing partial differential equations (PDEs) into corresponding ordinary differential equations (ODEs). Using the three-stage Labatto III-A method included in the MATLAB software’s bvp4c solver, the ODE system is solved numerically. In certain ranges of involved parameters, two solutions are received. The temperature profile θη upsurges in both solutions with growing values of EC and Rd. Moreover, the conclusion is that solution duality exists when the suction parameter S≥Sci, while no flow of fluid is possible when S<Sci. Finally, stability analysis has been performed and it has been found that only the first solution is the stable one between both solutions. Full article
(This article belongs to the Special Issue Impact of Nanofluid on Heat Transfer)
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30 pages, 11741 KiB  
Article
Effect of the Aspect Ratio and Tilt Angle on the Free Convection Heat Transfer Coefficient Inside Al2O3–Water-Filled Square Cuboid Enclosures
by Redhwan Almuzaiqer, Mohamed ElSayed Ali and Khaled Al-Salem
Nanomaterials 2022, 12(3), 500; https://doi.org/10.3390/nano12030500 - 31 Jan 2022
Cited by 8 | Viewed by 2239
Abstract
This experimental study provides a comprehensive investigation of natural convection heat transfer inside shallow square cuboid enclosures filled with aluminum oxide–water nanofluid at four different volume concentrations: 0.0%, 0.2%, 0.4%, and 0.8%. Two square cuboid enclosures were used with sizes 30 × 30 [...] Read more.
This experimental study provides a comprehensive investigation of natural convection heat transfer inside shallow square cuboid enclosures filled with aluminum oxide–water nanofluid at four different volume concentrations: 0.0%, 0.2%, 0.4%, and 0.8%. Two square cuboid enclosures were used with sizes 30 × 30 × H cm3, where H is the inside thickness of the enclosures. This led to two different enclosure aspect ratios (κ = H/30 = 0.033 and 0.066). Four inclination angles to the horizontal position of the enclosures were used: 0°, 30°, 60°, and 90°. The crucial thermophysical properties of the synthetic nanofluid were obtained. The thermal conductivity of the nanofluid was measured experimentally at various volume concentrations. Furthermore, the viscosity and density were also measured experimentally at temperatures ranging from 15 to 40 °C as a function of the volume concentration. The heat transfer data were generated by heating the lower surface of the enclosure using a uniform flexible heat flux heater. The opposite surface was cooled using an air fan. The results of the experimental physical parameter measurements show that the percent of maximum deviation in thermal conductivity with those in the literature were 6.61% at a 1.0% volume concentration. The deviation of dynamic viscosity was between 0.21% and 16.36% at 0.1% and 1% volume concentrations, respectively, and for density it was 0.29% at 40 °C and a 1% volume concentration. The results showed up to a 27% enhancement in the Nusselt number at an angle of 60° and a 0.4% volume concentration in the largest aspect ratio (κ = 0.066). However, for the low aspect ratio enclosure (κ = 0.033), there was no noticeable improvement in heat transfer at any combination of volume concentration and inclination angle. The results show that the inclination angle is a significant factor in natural convection only for large aspect ratio enclosures. Furthermore, for large aspect ratio, the Nusselt number increased until the angle approached 60°, then it decreased again. Full article
(This article belongs to the Special Issue Impact of Nanofluid on Heat Transfer)
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21 pages, 18966 KiB  
Article
Effect of Multi-Walled Carbon Nanotubes-Based Nanofluids on Marine Gas Turbine Intercooler Performance
by Salah Almurtaji, Naser Ali, Joao A. Teixeira and Abdulmajid Addali
Nanomaterials 2021, 11(9), 2300; https://doi.org/10.3390/nano11092300 - 4 Sep 2021
Cited by 7 | Viewed by 2659
Abstract
Coolants play a major role in the performance of heat exchanging systems. In a marine gas turbine engine, an intercooler is used to reduce the compressed gas temperature between the compressor stages. The thermophysical properties of the coolant running within the intercooler directly [...] Read more.
Coolants play a major role in the performance of heat exchanging systems. In a marine gas turbine engine, an intercooler is used to reduce the compressed gas temperature between the compressor stages. The thermophysical properties of the coolant running within the intercooler directly influence the level of enhancement in the performance of the unit. Therefore, employing working fluids of exceptional thermal properties is beneficial for improving performance in such applications, compared to conventional fluids. This paper investigates the effect of utilizing nanofluids for enhancing the performance of a marine gas turbine intercooler. Multi-walled carbon nanotubes (MWCNTs)-water with nanofluids at 0.01–0.10 vol % concentration were produced using a two-step controlled-temperature approach ranging from 10 °C to 50 °C. Next, the thermophysical properties of the as-prepared suspensions, such as density, thermal conductivity, specific heat capacity, and viscosity, were characterized. The intercooler performance was then determined by employing the measured data of the MWCNTs-based nanofluids thermophysical properties in theoretical formulae. This includes determining the intercooler effectiveness, heat transfer rate, gas outlet temperature, coolant outlet temperature, and pumping power. Finally, a comparison between a copper-based nanofluid from the literature with the as-prepared MWCNTs-based nanofluid was performed to determine the influence of each of these suspensions on the intercooler performance. Full article
(This article belongs to the Special Issue Impact of Nanofluid on Heat Transfer)
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Review

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25 pages, 3174 KiB  
Review
Thermophysical Properties of Hybrid Nanofluids and the Proposed Models: An Updated Comprehensive Study
by Mohammad M. Rashidi, Mohammad Alhuyi Nazari, Ibrahim Mahariq, Mamdouh El Haj Assad, Mohamed E. Ali, Redhwan Almuzaiqer, Abdullah Nuhait and Nimer Murshid
Nanomaterials 2021, 11(11), 3084; https://doi.org/10.3390/nano11113084 - 16 Nov 2021
Cited by 69 | Viewed by 3669
Abstract
Thermal performance of energy conversion systems is one of the most important goals to improve the system’s efficiency. Such thermal performance is strongly dependent on the thermophysical features of the applied fluids used in energy conversion systems. Thermal conductivity, specific heat in addition [...] Read more.
Thermal performance of energy conversion systems is one of the most important goals to improve the system’s efficiency. Such thermal performance is strongly dependent on the thermophysical features of the applied fluids used in energy conversion systems. Thermal conductivity, specific heat in addition to dynamic viscosity are the properties that dramatically affect heat transfer characteristics. These features of hybrid nanofluids, as promising heat transfer fluids, are influenced by different constituents, including volume fraction, size of solid parts and temperature. In this article, the mentioned features of the nanofluids with hybrid nanostructures and the proposed models for these properties are reviewed. It is concluded that the increase in the volume fraction of solids causes improvement in thermal conductivity and dynamic viscosity, while the trend of variations in the specific heat depends on the base fluid. In addition, the increase in temperature increases the thermal conductivity while it decreases the dynamic viscosity. Moreover, as stated by the reviewed works, different approaches have applicability for modeling these properties with high accuracy, while intelligent algorithms, including artificial neural networks, are able to reach a higher precision compared with the correlations. In addition to the used method, some other factors, such as the model architecture, influence the reliability and exactness of the proposed models. Full article
(This article belongs to the Special Issue Impact of Nanofluid on Heat Transfer)
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