Abstract
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.
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