Title: Experimental investigation of the photo-thermal conversion performance of Fe₃O₄ nanofluid under a magnetic field

Authors: Tsogtbilegt Boldoo; Jeonggyun Ham; Honghyun Cho

Addresses: Department of Mechanical Engineering, Graduate School of Chosun University, Chosun University, 309 Pilmundaero, Dong-Gu, Gwangju 61452, South Korea ' Department of Mechanical Engineering, Graduate School of Chosun University, Chosun University, 309 Pilmundaero, Dong-Gu, Gwangju 61452, South Korea ' Department of Mechanical Engineering, Chosun University, 309 Pilmundaero, Dong-Gu, Gwangju 61452, South Korea

Abstract: The effect of magnetic field intensity and weight concentration on the photo-thermal conversion performance of Fe₃O₄ nanofluid (based on water/ethylene glycol, 20 wt%) was experimentally investigated in the presence of a magnetic field. The maximum increase found in the temperature of the working fluid was 22% at 0.2 wt% Fe₃O₄ nanofluid compared with that of the base fluid. In the presence of an external magnetic field, photo-thermal conversion performance increased with nanofluid concentration and magnetic intensity. For 0.2 wt% Fe₃O₄ nanofluid, photo-thermal conversion performance was increased by 11% at a magnetic intensity of 750 Gauss compared with the performance without the magnetic field. Furthermore, the maximum photo-thermal efficiency was 39% in the 0.2 wt% nanofluid after 20 min of operating time.

Keywords: ferrofluid (Fe₃O₄ nanofluid); photo-thermal conversion efficiency; magnetic intensity; optical absorbance; thermal conductivity; heat transfer; specific heat.

DOI: 10.1504/IJNT.2019.104468

International Journal of Nanotechnology, 2019 Vol.16 No.4/5, pp.244 - 250

Published online: 13 Jan 2020 *

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