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Improvement of photo-thermal energy conversion performance of MWCNT/Fe3O4 hybrid nanofluid compared to Fe3O4 nanofluid
- Tong, Yijie, Boldoo, Tsogtbilegt, Ham, Jeonggyun, Cho, Honghyun
- Energy 2020 v.196 pp. 117086
- carbon nanotubes, energy conversion, ethylene glycol, heat transfer, iron oxides, nanofluids, nanoparticles
- The thermal, optical, and photo-thermal energy conversion characteristics of Fe₃O₄ and multi-walled carbon nanotube (MWCNT)/Fe₃O₄ hybrid nanofluids, which was suspended in the mixture of water and ethylene glycol (weight ratio = 8:2) base fluid, were experimentally investigated under various conditions. The highest light transmittances of the Fe₃O₄ and MWCNT/Fe₃O₄ hybrid nanofluids were 89% and 29%, respectively. Besides, the maximum thermal conductivities of the Fe₃O₄ and MWCNT/Fe₃O₄ hybrid nanofluids were 0.541 and 0.562 W/m∙ᵒC, respectively, at a concentration of 0.01 wt%. The MWCNT/Fe₃O₄ hybrid nanofluid containing the high amount of MWCNT nanoparticles had almost two times higher photo-thermal energy conversion efficiency than that of the Fe₃O₄ nanofluid at the same weight concentration, thus it had a high potential to improve the heat transfer efficiency in the thermal system.