Recent developments in preparation of nanofluid for heat transfer enhancement in heat exchangers: A review

Kumar, P. Senthil; Sarviya, R. M.

doi:10.1016/j.matpr.2020.12.434

Cited by 21 publications

(9 citation statements)

References 37 publications

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“…However, the larger agglomerated particles generated by the destabilization of the nanofluid would likely increase the risk of erosion and clogging of the pipes and in the pump, which could impact equipment costs, on top of affecting pumping power due to decreased efficiency. [ 4,77 ] In CS1C, an investment for the purchase of the nanofluid is needed only every 5 years because of its high stability, allowing a positive cash flow of $1.90/m 2 in the first year of its implementation and $24.36/m 2 in the following 4 years. The annual savings on pumping cost in this case is higher than the investment needed for the purchase of nanofluid, resulting in a payback period of less than a year.…”

Section: Resultsmentioning

confidence: 99%

“…[ 2 ] Since then, a significant amount of research has been published on both single‐phase and two‐phase heat transfer using nanofluids, particularly over the past two decades. [ 3–11 ] In addition to heat transfer, nanofluids have been tested for medical, tribological, and mass transfer applications. [ 12–20 ] As proof of a strong interest from the scientific community, no less than 15 000 publications on nanofluids have been written in the last 10 years, many of them being detailed reviews on this tremendous literature, thus giving insight on the difficulty of the subject.…”

Section: Introductionmentioning

confidence: 99%

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Nanofluids as heat transfer fluids: Hurdles to industrial application and economic considerations

2022

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Nanofluids have gained substantial interest over the past years due to their enhanced thermal properties. However, these nanoparticle dispersions remain scarcely used in industrial applications. In this work, we demonstrate how the stability of nanofluids and economic factors are the major hurdles preventing their industrial large-scale use through an economic analysis. The costeffectiveness of multiwalled carbon nanotubes (MWCNT)-water and copper oxide-water nanofluids used in a concentric tube heat exchanger as substitutes for freshwater was assessed in four different scenarios. It was determined that three of the four cases were not economically viable, as a deficit was generated due to a recurring annual investment for the renewal of the nanofluids because they destabilized with time. The fourth case, however, was sustainable because of the nanofluid's high stability (5 years) and showed a payback period on investment of less than a year. Finally, a tool illustrating the operating window for nanofluid economics in our selected heat exchanger geometry was developed.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nanofluids as heat transfer fluids: Hurdles to industrial application and economic considerations

2022

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“…Consequently, implementing nanofluids has emerged as a promising passive approach to exploiting this phenomenon [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Enhancing Heat Transfer in Industrial Heat Exchangers with Water-Based GO Nanofluids: Comprehensive Analysis and Performance Optimization

Mousavi

2023

Preprint

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In this study, the heat transfer characteristics within the heat exchanger using water-based GO nanofluids were comprehensively assessed. An apparatus was constructed by scaling down an industrial heat exchanger. The nanofluid’s thermal conductivity, specific heat capacity, viscosity, density, Prandtl number, and Nusselt number were examined at varying temperatures and GO nanoparticle concentrations. The results revealed that the thermal conductivity of the nanofluid increased with both temperature and nanoparticle concentration, reaching its peak value of 0.380 W.m− 1. K− 1 at 85°C and 0.1%wt, leading to enhanced heat transfer rates through conduction and convection mechanisms. The specific heat capacity increased with temperature but decreased with higher GO nanoparticle contents, with a maximum value of 3403.821 J.kg− 1. K− 1 was recorded at 40°C and 0.01%wt. The viscosity of the nanofluid increased with higher concentrations of GO nanoparticles, and the minimum value of 0.83 mpa.s was observed at 85°C and 0.01%wt. The Prandtl number decreased with temperature but increased with increasing GO nanoparticle concentration, suggesting a transition from convective to conductive heat transfer. A newly derived correlation equation for the Nusselt number, Nu = 0.0059(1 + 7.62φ0.6886)Pe0.001Re0.9238Pr0.4, allows predicting heat transfer enhancement in nanofluids. The findings emphasize the potential of nanofluids for improving heat exchanger performance and offer valuable insights for optimizing nanofluid applications in thermal systems.

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“…Several researchers have examined the characteristics of fluid flow and heat transmission in numerous technical applications [1][2][3][4]. In the last decade, high-conductivity nanoparticles have been presented as a means of enhancing heat transmission [5][6][7][8]. The dissolving of nanoparticles in the base fluid produces a fluid known as a nanofluid.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulations of Magnetohydrodynamics Natural Convection and Entropy Production in a Porous Annulus Bounded by Wavy Cylinder and Koch Snowflake Loaded with Cu–Water Nanofluid

et al. 2022

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The current paper presents a numerical study of the magnetohydrodynamics natural convection and entropy production of Cu–water nanofluid contained in a porous annulus between a heated Koch snowflake and wavy cylinder with lower temperature with respect to the Koch snowflake. The numerical algorithm is based on the Galerkin Finite Element Method. The impacts of Rayleigh number (Ra = 103, 104, 105, and 106), Hartman number (Ha = 0, 25, 50, and 100), Darcy number (Da = 10−2, 10−3, 10−4, and 10−5), nanoparticle volumetric fraction (φ = 2%, 3%, 4%, and 5%), and the undulations number of the outer wavy cylinder (three cases) on the distributions of isotherms, streamlines, mean Nusselt number (Nuavg), as well as on total entropy production and Bejan number are thoroughly examined. The computational outcomes disclose that dispersing more Cu nanoparticles in the base fluid and creating a flow with higher intensity inside the annulus by raising the Rayleigh number bring about a boosted natural convective flow in the cavity, which improves the heat transmission rate. In addition, it can be noted that owing to the peculiar form of the heated Koch snowflake, nanofluid gets trapped between the angled parts, resulting in uneven temperature profiles with higher values in these places.

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Recent developments in preparation of nanofluid for heat transfer enhancement in heat exchangers: A review

Cited by 21 publications

References 37 publications

Nanofluids as heat transfer fluids: Hurdles to industrial application and economic considerations

Nanofluids as heat transfer fluids: Hurdles to industrial application and economic considerations

Enhancing Heat Transfer in Industrial Heat Exchangers with Water-Based GO Nanofluids: Comprehensive Analysis and Performance Optimization

Numerical Simulations of Magnetohydrodynamics Natural Convection and Entropy Production in a Porous Annulus Bounded by Wavy Cylinder and Koch Snowflake Loaded with Cu–Water Nanofluid

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