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Thermal properties of carbon black aqueous nanofluids for solar absorption.

Han D, Meng Z, Wu D, Zhang C, Zhu H - Nanoscale Res Lett (2011)

Bottom Line: 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.Carbon black nanofluids had good absorption ability of solar energy and can effectively enhance the solar absorption efficiency.

View Article: PubMed Central - HTML - PubMed

Affiliation: College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China. htzhu1970@163.com.

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.

No MeSH data available.


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Rheological behaviors of carbon black nanofluids of different concentrations at 27°C.
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Figure 6: Rheological behaviors of carbon black nanofluids of different concentrations at 27°C.

Mentions: Figure 6 shows the rheological behaviors of carbon black nanofluids for different concentrations at room temperature (27°C). A shear thinning behavior can be observed, and the extent of the shear thinning behavior increases with the carbon black concentration. The shear viscosity also increases with the increasing carbon black concentration at the same shear rate. The shear thinning behavior of present nanofluids is maybe due to the high concentration and aggregation structure of nanoparticles. It agrees with the results of Tseng et al. for concentrated (5 to approximately 12 vol.%) aqueous suspensions of TiO2 [32] and that of Tamjid et al. for Ag/diethylene glycol (0.2 to approximately 4.37 vol.%) [33].


Thermal properties of carbon black aqueous nanofluids for solar absorption.

Han D, Meng Z, Wu D, Zhang C, Zhu H - Nanoscale Res Lett (2011)

Rheological behaviors of carbon black nanofluids of different concentrations at 27°C.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211877&req=5

Figure 6: Rheological behaviors of carbon black nanofluids of different concentrations at 27°C.
Mentions: Figure 6 shows the rheological behaviors of carbon black nanofluids for different concentrations at room temperature (27°C). A shear thinning behavior can be observed, and the extent of the shear thinning behavior increases with the carbon black concentration. The shear viscosity also increases with the increasing carbon black concentration at the same shear rate. The shear thinning behavior of present nanofluids is maybe due to the high concentration and aggregation structure of nanoparticles. It agrees with the results of Tseng et al. for concentrated (5 to approximately 12 vol.%) aqueous suspensions of TiO2 [32] and that of Tamjid et al. for Ag/diethylene glycol (0.2 to approximately 4.37 vol.%) [33].

Bottom Line: 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.Carbon black nanofluids had good absorption ability of solar energy and can effectively enhance the solar absorption efficiency.

View Article: PubMed Central - HTML - PubMed

Affiliation: College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China. htzhu1970@163.com.

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.

No MeSH data available.


Related in: MedlinePlus