scholarly journals Evaluation of Physicothermal Properties of Silicone Oil Dispersed with Multiwalled Carbon Nanotubes and Data Prediction Using ANN

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Raviteja Surakasi ◽  
K. Ch. Sekhar ◽  
Ekrem Yanmaz ◽  
G. Yuvaraj ◽  
Jayaprakash Venugopal ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Silicone Oil ◽  
Weight Fraction ◽  
Solar Thermal ◽  
Multiwalled Carbon ◽  
Closed Loop Systems ◽  
Hidden Layer ◽  
Surface Modified

The researchers wanted to see whether MWCNTs changed the physicothermal properties of solar thermal working fluids. Assessing thermal properties is vital for solar thermal efficiency. Lubricant contains silicone oil resurfaced. It contains 0.25, 0.5, 0.75, and 1.0% multiwalled carbon nanotubes. Before dispersion in thermic fluids, nanomaterials must be properly surface modified. Between 100°C and 300°C, a fluid’s thermal conductivity and specific heat physical characteristics like viscosity and density may be inferred from data collected between 50°C and 150°C. Thermal conductivity increases by 15% to 20% when carbon nanotubes are dispersed. The pressure drop is minimal at 0.5 percent weight fraction, demonstrating the suitability of nanofluids in closed loop systems. The characteristics are forecasted using feed-forward backpropagation method and GRNN, and the best of them is selected for prediction. In this research, hidden layer neurons and factors are examined.

On the synthesis and thermal conductivity of nanocomposites with multiwalled carbon nanotubes

2015 ◽  
Vol 9 (4) ◽  
pp. 784-788 ◽  
Author(s):  
E. A. Vorobyeva ◽  
I. V. Makarenko ◽  
A. V. Makunin ◽  
V. A. Trifonov ◽  
N. G. Chechenin
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Multiwalled Carbon

Thermal conductivity of individual multiwalled carbon nanotubes

2012 ◽  
Vol 62 ◽  
pp. 40-43 ◽  
Author(s):  
M.K. Samani ◽  
N. Khosravian ◽  
G.C.K. Chen ◽  
M. Shakerzadeh ◽  
D. Baillargeat ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Multiwalled Carbon

Improved thermal conductivity of epoxy composites prepared with a mixed filler of multiwalled carbon nanotubes and aluminum nitride particles

2016 ◽  
Vol 29 (4) ◽  
pp. 484-492 ◽  
Author(s):  
Jian Jiao ◽  
Yonghong Cui ◽  
Yu Xia
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Aluminum Nitride ◽  
Multiwalled Carbon Nanotubes ◽  
Conductive Filler ◽  
Volume Resistivity ◽  
Phonon Transport ◽  
Multiwalled Carbon ◽  
Volume Percentage ◽  
The One

The thermal conductive filler/epoxy resin (EP) composites were prepared by a casting method. The effects of the multiwalled carbon nanotubes (MWCNTs), aluminum nitride (AlN) particles, and their compounds on the microstructure and thermal conductivity of the composites were investigated, in addition to the thermal properties. The results indicated that compounds of MWCNTs and AlN particles exhibited a remarkable synergistic effect to improve the thermal conductivity properties of the composites. The one-dimensional MWCNTs with superb thermal conductivity bridged the AlN particles to form an excellent network, which provides a faster and more effective pathway for phonon transport in the composites. The thermal conductivity of the 0.6 vol% MWCNTs/3.4 vol% AlN/EP composite is 0.53 W (m K)−1. In addition, the thermal conductivity of the MWCNTs/AlN/EP composites with 0.4 vol% MWCNTs and 3.4 vol% AlN is 0.48 W (m K)−1 (which is twice the value of 0.24 W (m K)−1 for the pure EP) which was much higher than the 0.4 vol% MWCNTs/EP composites (0.27 W (m K)−1) and the 3.4 vol% AlN/EP composites (0.28 W (m K)−1). Bruggeman’s equation is identified to fit quite well to the experimental results of the AlN/EP composites in the entire range of volume percentage of AlN; however, the MWCNTs/EP composites coincided better to the Russell equation. The volume resistivity of the MWCNTs/AlN/EP composites (approximately 1.8–2.6 × 1012 Ω m) exhibited only a slight compromise in comparison to the pure EP (2.5 × 1014 Ω m), which manifested the excellent insulation characteristic of these composites.

scholarly journals Thermal Conductivity of Carbon Nanoreinforced Epoxy Composites

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
C. Kostagiannakopoulou ◽  
E. Fiamegkou ◽  
G. Sotiriadis ◽  
V. Kostopoulos
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Carbon Fiber ◽  
Multiwalled Carbon Nanotubes ◽  
Epoxy Matrix ◽  
Epoxy Composites ◽  
Graphite Nanoplatelets ◽  
Multiwalled Carbon ◽  
Micromechanical Models ◽  
Carbon Fiber Epoxy

The present study attempts to investigate the influence of multiwalled carbon nanotubes (MWCNTs) and graphite nanoplatelets (GNPs) on thermal conductivity (TC) of nanoreinforced polymers and nanomodified carbon fiber epoxy composites (CFRPs). Loading levels from 1 to 3% wt. of MWCNTs and from 1 to 15% wt. of GNPs were used. The results indicate that TC of nanofilled epoxy composites increased with the increase of GNP content. Quantitatively, 176% and 48% increase of TC were achieved in nanoreinforced polymers and nanomodified CFRPs, respectively, with the addition of 15% wt. GNPs into the epoxy matrix. Finally, micromechanical models were applied in order to predict analytically the TC of polymers and CFRPs. Lewis-Nielsen model with optimized parameters provides results very close to the experimental ones in the case of polymers. As far as the composites are concerned, the Hashin and Clayton models proved to be sufficiently accurate for the prediction at lower filler contents.

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