Entity

Time filter

Source Type


Yu W.,Shanghai Second Polytechnic University | Xie H.,Shanghai Second Polytechnic University | Li Y.,Shanghai Second Polytechnic University | Chen L.,Shanghai Second Polytechnic University | Wang Q.,Qingdao Copton Petrochemical Co.
Powder Technology | Year: 2012

This paper presents an experimental investigation of rheological and heat transfer properties of Al 2O 3 nanofluids based on the mixture of 45vol.% ethylene glycol and 55 vol. % water. The Al 2O 3 nanofluids (volume fraction φ=0.02) over 45°C exhibit Newtonian behaviors, below 45°C, they will be non-Newtonian fluids. The enhanced thermal conductivity ratios of the nanofluids with the volume fraction 1.0%, 2.0% and 3.0% are 3.8%, 7.7%, and 11.6% respectively, slightly larger than those predicted by the classic theoretical models. The heat transfer coefficients of the nanofluids with 1.0vol.% and 2.0vol.% have been found an increase up to 57% and 106%, respectively, when the Reynolds number is 2000. © 2012 Elsevier B.V.


Yu W.,Shanghai Second Polytechnic University | Xie H.,Shanghai Second Polytechnic University | Li Y.,Shanghai Second Polytechnic University | Chen L.,Shanghai Second Polytechnic University | Wang Q.,Qingdao Copton Petrochemical Co.
Colloids and Surfaces A: Physicochemical and Engineering Aspects | Year: 2011

Homogeneous and stable ethylene glycol based nanofluids containing low volume concentration diamond nanoparticles have been prepared. Diamond nanoparticles, purified and surface modified by the mixture acid, consist of the highly defective structure and the active functional groups on the surface. Ultrasound and the alkalinity of solution are beneficial to the deaggregate of soft diamond particle aggregation, and the diameters of purified nanodiamond are changed from 30-50. nm to 5-10. nm. The thermal conductivity enhancement decreases with elapsed time for 1.0. vol.% DNP-EG nanofluid at pH = 7.0. While for the stable nanofluids at pH = 8.5, there is no obvious thermal conductivity decrease within 6 months. The thermal conductivity enhancement values are up to 17.23% for the 1.0. vol.% nanofluid at 30. °C. Viscosity measurements show that the nanofluids demonstrate Newtonian behavior, and the viscosity significantly decreases with the temperature. © 2010 Elsevier B.V.


Trademark
QINGDAO COPTON TECHNOLOGY COMPANY Ltd and Qingdao Copton Petrochemical Co. | Date: 2011-08-17

Antifreeze; Brake fluid; Chemical additives for enhancing the performance of lubricating oils, greases and internal combustion engine fuels. Industrial and vehicular lubricants.


Trademark
QINGDAO COPTON TECHNOLOGY COMPANY Ltd and Qingdao Copton Petrochemical Co. | Date: 2011-08-17

Antifreeze; Brake fluid; Chemical additives for enhancing the performance of lubricating oils, greases and internal combustion engine fuels. Industrial and vehicular lubricants.


Trademark
QINGDAO COPTON TECHNOLOGY COMPANY Ltd and Qingdao Copton Petrochemical Co. | Date: 2011-08-17

Antifreeze; Brake fluid; Chemical additives for enhancing the performance of lubricating oils, greases and internal combustion engine fuels. Industrial and vehicular lubricants.

Discover hidden collaborations