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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.


Related in: MedlinePlus

Thermal conductivity of 6.6 vol.% carbon black nanofluids as a function of temperature.
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Figure 9: Thermal conductivity of 6.6 vol.% carbon black nanofluids as a function of temperature.

Mentions: The thermal conductivity of carbon black nanofluids at the concentration of 6.6 vol.% is shown in Figure 9. The nanofluids at other concentrations have the similar trends. The thermal conductivity increases with the increasing temperature. For example, the thermal conductivity of nanofluid increases from 0.622 to 0.652 Wm-1K-1 when the temperature increases from 18.5°C to 55°C. The same trend had been observed by other researchers [37-40]. The carbon black nanofluid shows high thermal conductivities at high temperatures. This can effectively improve the solar energy utilization at high temperatures. At the same time, the viscosity decreases with the increase of temperature. Therefore, the carbon black nanofluids had better solar absorption properties at higher temperatures.


Thermal properties of carbon black aqueous nanofluids for solar absorption.

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

Thermal conductivity of 6.6 vol.% carbon black nanofluids as a function of temperature.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 9: Thermal conductivity of 6.6 vol.% carbon black nanofluids as a function of temperature.
Mentions: The thermal conductivity of carbon black nanofluids at the concentration of 6.6 vol.% is shown in Figure 9. The nanofluids at other concentrations have the similar trends. The thermal conductivity increases with the increasing temperature. For example, the thermal conductivity of nanofluid increases from 0.622 to 0.652 Wm-1K-1 when the temperature increases from 18.5°C to 55°C. The same trend had been observed by other researchers [37-40]. The carbon black nanofluid shows high thermal conductivities at high temperatures. This can effectively improve the solar energy utilization at high temperatures. At the same time, the viscosity decreases with the increase of temperature. Therefore, the carbon black nanofluids had better solar absorption properties at higher temperatures.

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