MWCNTs-water nanofluid as a cooling medium for energy and thermal management: an experimental study for pool boiling heat transfer applications

Owing to their ease of fabrication, oxide nanoparticle-containing nanofluids have been used in the majority of pool boiling investigations. Some investigations have reported a decline in boiling heat transfer. A significant increase in thermal conductivity was seen in the three-dimensional multi-walled carbon nanotube (MWCNT) nanofluids including extremely conducting nanoparticles, which are well-known for their favourable bulk domain heat transfer capabilities. Moreover, whereas many variables affecting the boiling point of nanofluids have been thoroughly investigated, the combined impacts of MWCNT nanoparticle ultrasonication duration and concentration have not yet received enough attention. The ultrasonication duration impact and concentration might have a major, even prevailing, impact on the surface characteristics of the depositing layers, particularly for MWCNTs with an extremely high aspect ratio. These qualities therefore have an impact on the boiling behaviours of MWCNT-based nanofluids. This work used pool boiling tests with heated copper regions in a pool of a water-based nanofluids in an environment of MWCNTs to show the consequences of concentration and ultrasonication duration. The impact of the deposition coatings created by the different MWCNTs on the boiling heat transfer features was investigated by describing the surface features of the boiling spherical surfaces through a series of tests.