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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

Schematic diagram of the nanofluids photothermal property test equipment. 1, thermocouple; 2, quartz tube; 3, nanofluids; 4, insulation materials; 5, data acquisition device.
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Figure 1: Schematic diagram of the nanofluids photothermal property test equipment. 1, thermocouple; 2, quartz tube; 3, nanofluids; 4, insulation materials; 5, data acquisition device.

Mentions: The schematic diagram of photothermal property test equipment was shown in Figure 1. Carbon black nanofluids were sealed in quartz tubes (d = 26 mm, h = 150 mm). The tubes were placed in an insulation box. Insulation materials were put under and between the tubes. Each tube was filled with nanofluids of the same amount, so that the experimental nanofluids had the same endothermic and heat transfer area. Temperatures of the nanofluids were measured and recorded in real time with thermocouples inserted in the nanofluids. The measurements were directly carried out in the sun and performed twice and averaged. The average atmospheric temperature is 24°C.


Thermal properties of carbon black aqueous nanofluids for solar absorption.

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

Schematic diagram of the nanofluids photothermal property test equipment. 1, thermocouple; 2, quartz tube; 3, nanofluids; 4, insulation materials; 5, data acquisition device.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 1: Schematic diagram of the nanofluids photothermal property test equipment. 1, thermocouple; 2, quartz tube; 3, nanofluids; 4, insulation materials; 5, data acquisition device.
Mentions: The schematic diagram of photothermal property test equipment was shown in Figure 1. Carbon black nanofluids were sealed in quartz tubes (d = 26 mm, h = 150 mm). The tubes were placed in an insulation box. Insulation materials were put under and between the tubes. Each tube was filled with nanofluids of the same amount, so that the experimental nanofluids had the same endothermic and heat transfer area. Temperatures of the nanofluids were measured and recorded in real time with thermocouples inserted in the nanofluids. The measurements were directly carried out in the sun and performed twice and averaged. The average atmospheric temperature is 24°C.

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