PHOTOTHERMAL CONVERSION CHARACTERISTICS OF Fe3O4 COATED CARBON NANOTUBE FERROFLUID UNDER ACTION OF MAGNETIC FIELD

被引：0
|
作者：
Xing M. [1 ]
Ding X. [1 ]
Jia C. [1 ]
Zhang H. [1 ]
Jing D. [1 ]
机构：
[1] Beijing Engineering Research Centre of Sustainable Energy and Buildings, School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing
来源：
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | 2023年 / 44卷 / 08期
关键词：
carbon nanotubes; magnetic field; magnetic fluids; photo-thermal conversion; solar energy;
D O I：
10.19912/j.0254-0096.tynxb.2022-0544
中图分类号：
学科分类号：
摘要：
In this paper, the photothermal conversion characteristics of water-based magnetic Multiwall Carbon Nanotube （MWCNTFe3O4) fluids were experimentally studied. MWCNT- Fe3O4 nanocomposite were synthesized by improved chemical co- precipitation method. The photothermal conversion experiments were carried out on the magnetic fluids with mass concentrations of 0.001%,0.005%，0.010%，0.050，0.100% and 0.200%，respectively. In addition, the effect of magnetic field intensity and direction on the photothermal conversion performance of magnetic fluid were investigated. The results show that the photothermal conversion efficiency increases with the increased concentration in the lower concentration range，and the 30% higher photothermal conversion efficiency than that of pure water is obtained at concentration of 0.01%. However, the photothermal conversion efficiency decreases due to the decreased light transmittance at the higher concentration. In addition，magnetic MWCNT will be oriented distribution under the action of magnetic field. The photothermal conversion efficiency is improved under the action of vertical magnetic field because its ultra-high axial thermal conductivity is consistent with temperature gradient direction to make the even temperature distribution in the fluid. The MWCNT arrangement direction is perpendicular to the temperature gradient direction，which suppresses the heat transfer in the fluid under the action of horizontal magnetic field. As a result, the photothermal conversion efficiency is reduced. © 2023 Science Press. All rights reserved.
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页码：338 / 344
页数：6
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