Influence of molecular mass of PEG on rheological behaviour of MWCNT-based nanofluids for thermal energy storage

Marcos, Marco A.; Lugo, Luis; Ageev, Sergei V.; Podolsky, Nikita E.; Cabaleiro, David; Постнов, В. Н.; Semenov, Konstantin N.

doi:10.1016/j.molliq.2020.113965

Cited by 19 publications

(11 citation statements)

References 78 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, for AG-MWCNT and TrX-MWCNT samples, a prominent shear thickening behavior occurred above 380 s À190 (trends observed in the present work for isothermal flow curves below 25°C). Lastly, investigating 0.025-0.70 wt.% MWCNT/PEG-200 and PEG-300 based nanofluids at 15°C, Marcos et al 91 also observed shear thinning behavior (corroborating with the results of Figure 7).…”

Section: Resultssupporting

confidence: 73%

“…However for AG-MWCNT and TrX-MWCNT a prominent shear thickening behavior occurred above 380 s À1 . A shear thinning behavior was also observed by Marcos et al 91 during their experimental investigation of 0.025-0.70 wt.% MWCNT/PEG-200 and PEG-300 based nanofluids at 15°C. ZnO-MWCNTs/engine oil hybrid nanolubricant with a volume fraction range of 0.05%-0.8% was experimentally studied by Goodarzi et al 92 Results have shown for 5°C and 15°C: (i) a Newtonian behavior for samples with a volume fraction range of 0.05%-0.4%; (ii) a smooth sheat thinning behavior with volume fraction of 0.6%; (iii) a prominent shear thinning behavior at 0.8% of volume fraction.…”

Section: Introductionsupporting

confidence: 70%

“…As previously described in the literature survey, there is a scarcity of works that went beyond standard viscosity versus temperature analysis. Specifically, concerning the rheological characterization of MWCNT-nanofluids at below-ambient temperatures, to the authors' knowledge, only five works, 79,85,[90][91][92] were encountered, albeit with different base fluids. Furthermore, the results obtained by Liu et al 85 and Goodarzi et al 92 are not qualitatively comparable to the ones of the present work, due to the extremely different nature of the base fluid chosen (liquid paraffin and engine oil).…”

Section: Resultsmentioning

confidence: 99%

“…In the next paragraphs, an overview of the works that applied rheological characterization to MWCNT-nanofluids, in the last 4 years, is presented. [79][80][81][82][83][84][85][86][87][88][89][90][91][92] The scarcity of works, notably at below-ambient temperatures, will be highlighted.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Cold start analysis of an engine coolant-MWCNT nanofluid: Synthesis and viscosity behavior under shear stress

Sica

Contreras

Filho

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

During cold start of internal combustion engines, coolant temperature, and thermal conductivity are key parameters in the heat transfer processes that ultimately affect pollutant emissions and engine performance. Hereupon the use of coolants with suspended nanoparticles, to enhance thermal conductivity, emerged as a promising technology. However, for Newtonian materials, viscosity also increases with nanoparticle concentration. To overcome increased pumping power, the use of non-Newtonian nanofluids makes such application potentially feasible, specifically for shear-thinning materials, in which a higher shear rate leads to reducing shear viscosity due to higher shear stress. Accordingly, a nanofluid, suitable for engine cooling (0.2 wt.% MWCNT-engine coolant/distilled water 30/70 v/v%), was here fabricated and mapped. Shear rate and temperature were varied, with focus on cold start investigation. Shear thinning and shear thickening regions were mapped according to the shear rate levels, for each temperature considered. The nanofluid behaved as shear-thinning material for the entire range of temperatures (−10°C–25°C). Above shear rates of 500 s−1 and flow curves with temperatures below −5°C, a prominent shear thickening behavior was observed. Additionally, the relative apparent viscosity data were compared with four classical models. Regarding the curve fitting parameters of a modified Herschel-Bulkley equation, above 0°C, the apparent yield stress, [Formula: see text], was invariant with temperature. Besides, for the temperature range from 0°C to 20°C, the flow index remained approximately constant. For temperatures above −5°C, infinite-shear-rate viscosity and consistency index presented a linear decrease and a third-degree polynomial-like behavior, respectively.

show abstract

Section: Resultssupporting

confidence: 73%

Section: Introductionsupporting

confidence: 70%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Cold start analysis of an engine coolant-MWCNT nanofluid: Synthesis and viscosity behavior under shear stress

Sica

Contreras

Filho

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

show abstract

“…Carbon-based nanomaterials generally possess high thermal conductivity [36], and several research groups are focusing on diamond and graphene nanomaterials to fully understand their potential in different applications. Diamond nanoparticles possess interesting mechanical, optical, thermal, and electrochemical properties.…”

Section: Introductionmentioning

confidence: 99%

Rheological behavior of stabilized diamond-graphene nanoplatelets hybrid nanosuspensions in mineral oil

Ilyas

Ridha

Sardar

et al. 2021

Journal of Molecular Liquids

View full text Add to dashboard Cite

Recent advancements in thermo-fluid technology assisted with highly thermal conductive nanomaterials have shown assuring outcomes. It is also proven that thermal conductivity alone cannot define the overall heat transfer characteristics, and the viscous properties are equally significant towards thermal management. Therefore, this research involves investigating the rheological behavior of hybrid nanosuspensions containing high thermally conductive diamond and graphene nanoplatelets (1:1). These nanomaterials are dispersed in mineral oil using a two-step technique. Hybrid nanofluids' stability is achieved using a non-ionic stabilizer Span85, exhibiting no sedimentation for a minimum of five months. Nanomaterial characterizations are performed to study morphology, purity, and chemical analysis. The flow behavior of hybrid nanosuspensions is investigated at varying nanomaterial mass concentrations (0-2 %), temperatures (298.15-338.15 K), and shear rates (1-2000 s -1 ). Hybrid nanofluids exhibit shear-thinning behavior, which is also correlated with the Ostwald-de-Waele model. The temperature-viscosity relationship is well predicted using the Vogel-Fulcher-Tammann model. Hybrid nanofluids show a maximum enhancement of 35% viscosity at 2% concentration. A generalized twovariable correlation is used to express viscosity as a function of temperature and nanofluid concentration with an excellent agreement. Three different machine learning methods, i.e., Artificial Neural Network (ANN), Gradient Boosting Machine (GBM), and Random Forest (RF) algorithms are also introduced to predict the viscosity of hybrid nanofluids based on the three input parameters (temperature, concentration, and shear rate). The parity plots conclude that all algorithms can predict big-data viscous behavior with high precision.

show abstract

Synthesis of copolymeric micelle (PEG-b-pMMA) through ATRP method for pH-triggered sustained release behaviour

Pal

Karmakar

2023

Polym. Bull.

View full text Add to dashboard Cite

Influence of molecular mass of PEG on rheological behaviour of MWCNT-based nanofluids for thermal energy storage

Cited by 19 publications

References 78 publications

Cold start analysis of an engine coolant-MWCNT nanofluid: Synthesis and viscosity behavior under shear stress

Cold start analysis of an engine coolant-MWCNT nanofluid: Synthesis and viscosity behavior under shear stress

Rheological behavior of stabilized diamond-graphene nanoplatelets hybrid nanosuspensions in mineral oil

Synthesis of copolymeric micelle (PEG-b-pMMA) through ATRP method for pH-triggered sustained release behaviour

Contact Info

Product

Resources

About