关键词: 纳米流体, 表面活性剂, 池沸腾, 多孔介质, 传热

Abstract: Heat transfer performance of nanofluids in nucleate pool boiling was experimentally investigated in 6 mm copper beads. The nanofluid was prepared by dispersing the 40nm CuO nanoparticles in the base fluid water by using sodium dodecyl benzene sulphate(SDBS) as the surfactants,and both the proportion of the mass fraction were different. Experimental results showed that the nanofluid is in stability and has a good heat transfer performance at the same concentration ranges from 0.01% to 0.03% of nanoparticles and surfactants. The nanofluid could transfer heat more effectively at the slightly higher concentration of surfactants. The best heat transfer coefficient from the range above was 41670 W/(m²·K),where the concentration of CuO and SDBS were 0.02% and 0.03%,respectively. The sedimentation occurred obviously at the larger proportion of nanoparticles,which could enhance or weaken the boiling heat transfer at the different grade. The visualization research of nanofluid pool boiling was also investigated. It could interpret experimental results by analyzing the detachment characteristics of boiling bubble. All these results in this paper can be supplied for the research of nanofluid pool boiling on porous bead-packed structures with useful experimental data.

Key words: nanofluid, surfactants, pool boiling, porous media, heat transfer