Experimental investigation of thermophysical properties of Al 2 O 3 –water nanofluid: Role of surfactants

Das, Probal Kumar; Islam, Nurul; Santra, Apurba Kumar; Ganguly, Ranjan

doi:10.1016/j.molliq.2017.04.099

Cited by 122 publications

(56 citation statements)

References 33 publications

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“…Finally, the dried sample is placed in the SEM vacuumed chamber to capture the particles images [26]. Das et al [143] used TEM images to determine the stability of 99.7% pure alumina (50 nm average particles diameter) dispersed in DW, with and without surfactant, at 0.1-2.0 vol%. Sodium dodecyl sulphate (SDS), cetyl trimethyl ammonium bromide (CTAB), and SDBS surfactants were used separately in the fabrication process to form (Al 2 O 3 -SDS -DW), (Al 2 O 3 -CTAB -DW), and (Al 2 O 3 -SDBS -DW) nanofluids, which were compared to pure Al 2 O 3 / DW samples.…”

Section: Electron Microscopy Methodsmentioning

confidence: 99%

A Review on Nanofluids: Fabrication, Stability, and Thermophysical Properties

Ali

Teixeira

Addali

2018

Journal of Nanomaterials

309

178

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Nanofluids have been receiving great attention in recent years due to their potential usage, not only as an enhanced thermophysical heat transfer fluid but also because of their great importance in applications such as drug delivery and oil recovery. Nevertheless, there are some challenges that need to be solved before nanofluids can become commercially acceptable. The main challenges of nanofluids are their stability and operational performance. Nanofluids stability is significantly important in order to maintain their thermophysical properties after fabrication for a long period of time. Therefore, enhancing nanofluids stability and understanding nanofluid behaviour are part of the chain needed to commercialise such type of advanced fluids. In this context, the aim of this article is to summarise the current progress on the study of nanofluids, such as the fabrication procedures, stability evaluation mechanism, stability enhancement procedures, nanofluids thermophysical properties, and current commercialisation challenges. Finally, the article identifies some possible opportunities for future research that can bridge the gap between in-lab research and commercialisation of nanofluids.

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Section: Electron Microscopy Methodsmentioning

confidence: 99%

A Review on Nanofluids: Fabrication, Stability, and Thermophysical Properties

Ali

Teixeira

Addali

2018

Journal of Nanomaterials

309

178

View full text Add to dashboard Cite

show abstract

“…Experimentation has shown that nanofluid thermal conductivity is dependent upon base liquid [3,[9][10][11][12][13][14][15], possible surfactant [16][17][18][19][20][21][22][23], concentration [1,3,4,[7][8][9][10][11]13,15,16,[22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40], temperature [5,8,10,12,13,25,…”

Section: Nanofluid Thermal Conductivitymentioning

confidence: 99%

“…Scientists have studied the effects of various surfactants on the thermal conductivity of nanofluids [16][17][18][19][20][21][22][23]. Surfactant was mixed with the base liquid of various nanofluids in order to produce a uniform distribution of nanoparticles, and to prevent the agglomeration of nanoparticles.…”

Section: Effects Of Surfactant On Nanofluid Thermal Conductivitymentioning

confidence: 99%

“…In some cases, researchers have observed negative effects of surfactants on the thermal conductivity of nanofluids. Using a KD2 Pro Thermal Property Analyzer, Das et al [22] measured the thermal conductivity of Al 2 O 3 -water nanofluid as a function of temperature and nanoparticle volume concentration. The stability of the nanofluid was tested using CTAB, SDBS, and SDS as surfactants.…”

Section: Effects Of Surfactant On Nanofluid Thermal Conductivitymentioning

confidence: 99%

“…In general, experimental data has shown that nanofluid thermal conductivity increases with nanoparticle volume fraction [1,3,4,[7][8][9][10][11]13,15,16,[22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40]. However, in some cases researchers have observed a linear relationship between thermal conductivity and nanoparticle concentration [3,9,15,22,[37][38][39][40], whereas in other cases a non-linear relationship has been observed [1,4,7,8,11,13,16,23,[26][27][28]…”

Section: Effects Of Concentration Of Nanoparticles On Nanofluid Thermmentioning

confidence: 99%

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Nanofluid Thermal Conductivity and Effective Parameters

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Due to the more powerful and miniaturized nature of modern devices, conventional heat-transfer working fluids are not capable of meeting the cooling needs of these systems. Therefore, it is necessary to improve the heat-transfer abilities of commonly used cooling fluids. Recently, nanoparticles with different characteristics have been introduced to base liquids to enhance the overall thermal conductivity. This paper studies the influence of various parameters, including base liquid, temperature, nanoparticle concentration, nanoparticle size, nanoparticle shape, nanoparticle material, and the addition of surfactant, on nanofluid thermal conductivity. The mechanisms of thermal conductivity enhancement by different parameters are discussed. The impact of nanoparticles on the enhanced thermal conductivity of nanofluids is clearly shown through plotting the thermal conductivities of nanofluids as a function of temperature and/or nanoparticle concentration on the same graphs as their respective base liquids. Additionally, the thermal conductivity of hybrid nanofluids, and the effects of the addition of carbon nanotubes on nanofluid thermal conductivity, are studied. Finally, modeling of nanofluid thermal conductivity is briefly reviewed.

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Effects of Key Parameters on Nanofluid Thermal Performance in Heat Exchangers

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Nanofluids are utilized in cooling equipment such as heat exchangers and renewable energies such as solar cells as heat transfer fluid. The techniques for nanofluid stability enhancement and stability evaluations, such as zeta potential, electron microscopy, and photographic techniques for sedimentation, are reviewed as well as some recent achievements in nanofluid stabilization and research on the parameters affecting the thermal properties of nanofluids. Finally, the applications of nanofluids in cooling devices are described. Increased heat transfer, reduced heat transfer time and size of heat exchangers, and finally higher energy and heat efficiency could be the most significant achievements. The parameters affecting the thermal conductivity of nanofluids include concentration, temperature, particle fluid, type of base fluid, and nanoparticles.

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Experimental investigation of thermophysical properties of Al 2 O 3 –water nanofluid: Role of surfactants

Cited by 122 publications

References 33 publications

A Review on Nanofluids: Fabrication, Stability, and Thermophysical Properties

A Review on Nanofluids: Fabrication, Stability, and Thermophysical Properties

Nanofluid Thermal Conductivity and Effective Parameters

Effects of Key Parameters on Nanofluid Thermal Performance in Heat Exchangers

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