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Thermal properties of carbon black aqueous nanofluids for solar absorption

Dongxiao Han, Zhaoguo Meng, Daxiong Wu, Canying Zhang and Haitao Zhu*

Author affiliations

College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China

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Citation and License

Nanoscale Research Letters 2011, 6:457  doi:10.1186/1556-276X-6-457

Published: 18 July 2011

Abstract

In this article, carbon black nanofluids were prepared by dispersing the pretreated carbon black powder into distilled water. The size and morphology of the nanoparticles were explored. The photothermal properties, optical properties, rheological behaviors, and thermal conductivities of the nanofluids were also investigated. The results showed that the nanofluids of high-volume fraction had better photothermal properties. Both carbon black powder and nanofluids had good absorption in the whole wavelength ranging from 200 to 2,500 nm. The nanofluids exhibited a shear thinning behavior. The shear viscosity increased with the increasing volume fraction and decreased with the increasing temperature at the same shear rate. The thermal conductivity of carbon black nanofluids increased with the increase of volume fraction and temperature. Carbon black nanofluids had good absorption ability of solar energy and can effectively enhance the solar absorption efficiency.

Keywords:
nanofluids; solar absorption; carbon black; photothermal properties; rheological behaviors; thermal conductivity