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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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Thermal conductivity of nanofluids as a function of carbon black volume fraction at 35°C.
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Figure 8: Thermal conductivity of nanofluids as a function of carbon black volume fraction at 35°C.

Mentions: Figure 8 shows the thermal conductivity of carbon black nanofluids for different concentrations at 35°C. The nanofluids at other temperatures (ranging from 15°C to 55°C) have the similar trends. It can be seen that the thermal conductivity of nanofluids increases with the increase of carbon black volume fraction. For example, the thermal conductivities of current nanofluids are 0.619, 0.632, 0.643, and 0.652 Wm-1K-1, correlated to volume fractions of 4.4%, 5.5%, 6.6%, and 7.7%, respectively. The experimental data show a near linear correlation between the thermal conductivity and the volume fraction of carbon black. It agrees with the results in the literatures [34-36]. The thermal conductivity enhancements of current nanofluids are smaller than the reported results of functionalized carbon black nanofluids [30], which can probably be attributed to the surface functionalization of carbon black nanoparticles.


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 nanofluids as a function of carbon black volume fraction at 35°C.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 8: Thermal conductivity of nanofluids as a function of carbon black volume fraction at 35°C.
Mentions: Figure 8 shows the thermal conductivity of carbon black nanofluids for different concentrations at 35°C. The nanofluids at other temperatures (ranging from 15°C to 55°C) have the similar trends. It can be seen that the thermal conductivity of nanofluids increases with the increase of carbon black volume fraction. For example, the thermal conductivities of current nanofluids are 0.619, 0.632, 0.643, and 0.652 Wm-1K-1, correlated to volume fractions of 4.4%, 5.5%, 6.6%, and 7.7%, respectively. The experimental data show a near linear correlation between the thermal conductivity and the volume fraction of carbon black. It agrees with the results in the literatures [34-36]. The thermal conductivity enhancements of current nanofluids are smaller than the reported results of functionalized carbon black nanofluids [30], which can probably be attributed to the surface functionalization of carbon black nanoparticles.

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