On evaluation of thermophysical properties of transformer oil-based nanofluids: A comprehensive modeling and experimental study

2020 ◽  
Vol 300 ◽  
pp. 112249 ◽  
Author(s):  
Ahmadreza Ghaffarkhah ◽  
Masoud Afrand ◽  
Mohsen Talebkeikhah ◽  
Ali Akbari Sehat ◽  
Mostafa Keshavarz Moraveji ◽  
...  
Keyword(s):  
Experimental Study ◽  
Thermophysical Properties ◽  
Transformer Oil ◽  
Comprehensive Modeling

An Experimental Study of Thermophysical Properties for Quinary High-Entropy NiFeCoCrCu/Al Alloys

2016 ◽  
Vol 33 (11) ◽  
pp. 116102 ◽  
Author(s):  
Wei-Li Wang ◽  
Li-Jun Meng ◽  
Liu-Hui Li ◽  
Liang Hu ◽  
Kai Zhou ◽  
...  
Keyword(s):  
Experimental Study ◽  
Thermophysical Properties ◽  
Al Alloys ◽  
High Entropy

An Experimental Study of Free Corrective Heat Transfer in a Parallelogrammic Enclosure

1983 ◽  
Vol 105 (3) ◽  
pp. 433-439 ◽  
Author(s):  
N. Seki ◽  
S. Fukusako ◽  
A. Yamaguchi
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Nusselt Number ◽  
Correlation Equation ◽  
Transformer Oil ◽  
Experimental Measurements ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Prandtl Numbers ◽  
Rayleigh Numbers

Experimental measurements are presented for free convective heat transfer across a parallelogrammic enclosure with the various tilt angles of parallel upper and lower walls insulated. The experiments covered a range of Rayleigh numbers between 3.4 × 104 and 8.6 × 107, and Prandtl numbers between 0.70 and 480. Those also covered the tilt angles of the parallel insulated walls with respect to the horizontal, φ, of 0, ±25, ±45, ±60, and ±70 deg under an aspect ratio of H/W = 1.44. The fluids used were air, transformer oil, and water. It was found that the heat transfer coefficients for φ = −70 deg were decreased to be about 1/18 times those for φ = 0 deg. Experimental results are given as plots of the Nusselt number versus the Rayleigh number. A correlation equation is given for the Nusselt number, Nu, as a function of φ, Pr, and Ra.

scholarly journals Comprehensive Experimental Study on the Thermophysical Characteristics of DI Water Based Co0.5Zn0.5Fe2O4 Nanofluid for Solar Thermal Harvesting

Energies ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 6218
Author(s):  
Tsogtbilegt Boldoo ◽  
Jeonggyun Ham ◽  
Honghyun Cho
Keyword(s):  
Thermal Conductivity ◽  
Experimental Study ◽  
Energy Conversion ◽  
Thermophysical Properties ◽  
Base Fluid ◽  
Energy Conversion Efficiency ◽  
Thermophysical Characteristics ◽  
Magnetic Nanofluid ◽  
Solar Exposure ◽  
Water Based

The thermophysical properties of water-based Co0.5Zn0.5Fe2O4 magnetic nanofluid were investigated experimentally. Consequently, the viscosities of 0.25 wt% and 1 wt% Co0.5Zn0.5Fe2O4 nanofluid were 1.03 mPa∙s and 1.13 mPa∙s, each greater than that of the 20 °C base fluid (water), which were increased by 7.3% and 17.7%, respectively. The Co0.5Zn0.5Fe2O4 nanofluid thermal conductivity enhanced from 0.605 and 0.618 to 0.654 and 0.693 W/m·°C at concentrations of 0.25 wt% and 1 wt%, respectively, when the temperature increased from 20 to 50 °C. The maximum thermal conductivity of the Co0.5Zn0.5Fe2O4 nanofluid was 0.693 W/m·°C at a concentration of 1 wt% and a temperature of 50 °C. Furthermore, following a solar exposure of 120 min, the photothermal energy conversion efficiency of 0.25 wt%, 0.5 wt%, 0.75 wt%, and 1 wt% Co0.5Zn0.5Fe2O4 nanofluids increased by 4.8%, 5.6%, 7.1%, and 4.1%, respectively, more than that of water.

Sign in / Sign up

Export Citation Format

Share Document