Photo-thermal properties of MWCNT-H2O nanofluid

doi:10.11949/j.issn.0438-1157.20160797

Abstract

Abstract:

Stable aqueous suspensions of multi-walled carbon nanotubes (MWCNTs) with mass fractions ranging from 0.0015% to 0.1% were prepared via two-step method.The impacts of mass fraction, setting time, and heating times on the optical absorption property of MWCNT-H₂O nanofluid were investigated according to the transmittance measured by UV-VIS-NIR spectrophotometer over the wavelength from 200 to 2000 nm.Furthermore, an insolation experiment was performed to investigate the effects of mass fraction and light irradiation times on the photo-thermal property of MWCNT-H₂O nanofluids.Results show that the transmittance of MWCNT-H₂O nanofluid was decreased evidently after the addition of MWCNTs in deionized (DI) water, and long setting time leads to smaller transmittance.Heating is beneficial to improve light-absorption property of nanofluids.An optimal mass fraction of 0.01% with respect to the best photo-thermal conversion was found.Compared to DI water, the temperature of MWCNT-H₂O nanofluid at the optimal mass fraction was increased by about 15.1℃ (or 22.7%) after a lighting time of 45 min.Additionally, photo-thermal conversion performance is enhanced with increasing the lighting time at a low concentration of nanofluid, while it is just opposite at higher concentrations.The nanoparticle agglomeration may account for the above results.

Key words: nanomaterial, solar energy, photo-thermal property, transmittance, agglomeration

摘要：

通过两步法配制了浓度范围0.0015%~0.1%（质量，下同）的多壁碳纳米管（MWCNT）-水纳米流体，并利用分光光度计对不同浓度、静置时间和加热次数下纳米流体在波长200~2000 nm范围内的透射率进行了测试。同时，还对上述纳米流体开展了闷晒实验，研究了浓度和光照次数对纳米流体光热转换性能的影响。结果表明，水中添加MWCNT后透射率明显下降，纳米流体的透射率随着静置时间的增加而减小，加热有利于提高纳米流体的吸光性能；同时，闷晒实验发现存在利于光热转化的MWCNT-水纳米流体最佳浓度（0.01%），光照45 min后与水相比最佳浓度下的纳米流体温升提高了约15.1℃（或22.7%）。另外，纳米流体浓度较低时其光热转换性能随着光照次数的增加而提高，但浓度较高时则刚好相反，纳米颗粒团聚作用可能是造成上述结果的主要原因。

关键词: 纳米材料, 太阳能, 光热特性, 透射率, 团聚

CLC Number:

TK124

QU Jian, TIAN Min, WANG Qian, HAN Xinyue. Photo-thermal properties of MWCNT-H₂O nanofluid[J]. CIESC Journal, 2016, 67(S2): 113-119.

屈健, 田敏, 王谦, 韩新月. 碳纳米管-水纳米流体的光热转化特性[J]. 化工学报, 2016, 67(S2): 113-119.

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Photo-thermal properties of MWCNT-H₂O nanofluid

碳纳米管-水纳米流体的光热转化特性

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