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

Xing Meibo; Ding Xianzhe; Jia Chaofu; Zhang Hongfa; Jing Dongliang

doi:10.19912/j.0254-0096.tynxb.2022-0544

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (8) : 338-344. DOI: 10.19912/j.0254-0096.tynxb.2022-0544

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

Xing Meibo, Ding Xianzhe, Jia Chaofu, Zhang Hongfa, Jing Dongliang

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Abstract

In this paper, the photothermal conversion characteristics of water-based magnetic Multiwall Carbon Nanotube （MWCNT-Fe₃O₄) 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.

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magnetic fluids / solar energy / carbon nanotubes / photo-thermal conversion / magnetic field

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Xing Meibo, Ding Xianzhe, Jia Chaofu, Zhang Hongfa, Jing Dongliang. PHOTOTHERMAL CONVERSION CHARACTERISTICS OF Fe₃O₄ COATED CARBON NANOTUBE FERROFLUID UNDER ACTION OF MAGNETIC FIELD[J]. Acta Energiae Solaris Sinica. 2023, 44(8): 338-344 https://doi.org/10.19912/j.0254-0096.tynxb.2022-0544

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