Effect of different surfactants on the pool boiling heat transfer of SiO2/deionized water nanofluid on a copper surface

Abstract

Abstract The boiling heat transfer is one of the most widely applied heat transfer processes in today s industries. This study is an experimental investigation of the pool boiling heat transfer in a nanofluid composed of deionized (DI) water and silicon dioxide (SiO2) nanoparticles with added surfactants (Ps20, CTAB, SLS) on a copper surface at various nanofluid concentrations, under atmospheric pressure conditions. The nanofluid was synthesized using a two-step method and showed acceptable stability. The concentration of surfactant in nanofluid for all prepared nanofluids is 1 20 of nanoparticles mass. For the sake of repeatability and accuracy of the experiments, the deionized water was measured three times and was found to match the relations proposed in the literature. The results show the boiling heat transfer to be enhanced in the DI water with added surfactants compared with the deionized water. Moreover, the DI water with added surfactants observed a better boiling heat transfer compared to the DI-water-based SiO2 nanofluid with added surfactant. In addition, the boiling heat transfer was reduced as the concentration of the SiO2 nanofluid containing SLS and CTAB surfactants was increased. Meanwhile, increasing the concentration of the SiO2 nanofluid containing Ps20 surfactants from 0.01 to 0.1\u202fvol% enhanced the heat transfer. However, increasing the concentration to 1\u202fvol% reduced the heat transfer drastically. Therefore, at all heat fluxes, the nanofluid specimens with added SLS surfactants were associated with the highest boiling heat transfer, which was followed by the nanofluid with added CTAB, and the nanofluid with Ps20 (SLS\u202f>\u202fCTAB\u202f>\u202fPs20). In conclusion, ranking them by impact, anionic, cationic, and nonionic surfactants (nonionic