Effects of Surface Modificationon the Suspension Stability and Thermal Conductivity of Carbon Nanotubes Nanofluids

Zhang, P.; Wang, Hong; Wu, Jinxing; Liu, G.Z.; Xiao, Jinsheng; Chen, Z.B.; Cheng, Haibin

doi:10.1016/j.egypro.2015.03.080

Cited by 23 publications

(9 citation statements)

References 15 publications

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“…Two types of CNTs are reported in the literature [41,42]; one is a single-walled carbon nanotube (SWCNT), and the second one is a multiple-walled carbon nanotube (MWCNT). The impacts of CNTs on boundary layer flow and heat transfer are studied in [43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Rosseland thermal radiation and energy dissipation effects on entropy generation in CNTs suspended nanofluids flow over a thin needle

et al. 2018

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In this paper, we examine thermal radiation effect of the nonlinear form on the dissipative nanofluids containing carbon nanotubes past a moving horizontal thin needle. We also perform a second law analysis with viscous dissipation. Single-wall carbon nanotube and multiple-wall carbon nanotube drop in H 2 O base fluid. Introducing suitable dimensionless variables, we reduce the governing equations to self-similar nonlinear differential equations. Matlab in-built boundary value solver bvp4c and shooting method are applied for the solution of the reduced set of self-similar differential equations. The numerical results thus obtained are compared, which agree well with respect to desired accuracy. Various graphs are depicted and illustrate qualitatively the influence of flow controlling parameters such as Eckert number, heating parameter, radiation parameters, nanoparticles solid volume fraction, and size of thin needle on entropy generation, temperature distribution, and Bejan number.

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Section: Introductionmentioning

confidence: 99%

Nonlinear Rosseland thermal radiation and energy dissipation effects on entropy generation in CNTs suspended nanofluids flow over a thin needle

et al. 2018

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“…Preparation of nanofluids with added carbon nanotubes, especially multi-wall type (MWCNT), due to the way they disperse and thus also stabilize, seem to be rather problematic just due to their structure-multiple convergent tubes in one configuration, with the hydrophobic surface of these nanoadditives makes it difficult to use water as base fluid. Therefore, combined and multi-step methods are most often used during stabilization, involving ultrasonication processes, surfactants or pH regulators [88].…”

Section: Steric Stabilization-chemical Surface Alterationmentioning

confidence: 99%

Efficient Stabilization of Mono and Hybrid Nanofluids

Wciślik

2020

Energies

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Currently; the transfer of new technologies makes it necessary to also control heat transfer in different industrial processes—both in practical and research—applications. Not so long ago water and ethylene glycol were the most frequently used media in heat transfer. However, due to their relatively low thermal conductivity, they cannot provide the fast and effective heat transfer necessary in modern equipment. To improve the heat transfer rate different additives to the base liquid are sought, e.g., nanoadditives that create mono and hybrid nanofluids with very high thermal conductivity. The number of scientific studies and publications concerning hybrid nanofluids is growing, although they still represent a small percentage of all papers on nanofluids (in 2013 it was only 0.6%, and in 2017—ca. 3%). The most important point of this paper is to discuss different ways of stabilizing nanofluids, which seems to be one of the most challenging tasks in nanofluid treatment. Other future challenges concerning mono and hybrid nanofluids are also thoroughly discussed. Moreover, a quality assessment of nanofluid preparation is also presented. Thermal conductivity models are specified as well and new representative mono and hybrid nanofluids are proposed.

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“…(A) SEM image of CCNTs. (B) TEM image of pristine CNTs [Color figure can be viewed at wileyonlinelibrary.com]…”

Section: Stabilitymentioning

confidence: 99%

A review of nanofluid preparation, stability, and thermo‐physical properties

Dey

Kumar

Samantaray

2017

Heat Trans. Asian Res.

106

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This paper represents a comprehensive review on the preparation and stability of nanofluid, the convective heat transfer coefficient and different thermo‐physical properties such as thermal conductivity, specific heat capacity, viscosity, and so on. Here, for each thermo‐physical property, measurement methods, enhancement mechanisms, and criticisms of different studies are also presented. However, based on the available literature, it is concluded that a nanofluid has, in general, better thermo‐physical properties even at a very low particle concentration (typically 1% or less) than conventional heat transfer fluids. The only drawback is high viscosity which leads to a higher pressure drop. At a very low particle concentration, this drawback can be minimized. Three tables are provided for three thermo‐physical properties namely thermal conductivity, specific heat capacity, and viscosity, which can be used as a ready reference for calculating the nanofluid properties.

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Effects of Surface Modificationon the Suspension Stability and Thermal Conductivity of Carbon Nanotubes Nanofluids

Cited by 23 publications

References 15 publications

Nonlinear Rosseland thermal radiation and energy dissipation effects on entropy generation in CNTs suspended nanofluids flow over a thin needle

Nonlinear Rosseland thermal radiation and energy dissipation effects on entropy generation in CNTs suspended nanofluids flow over a thin needle

Efficient Stabilization of Mono and Hybrid Nanofluids

A review of nanofluid preparation, stability, and thermo‐physical properties

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