Pool boiling heat transfer characteristics of CeO2/deionized water nanofluids

Pool boiling heat transfer characteristics of CeO2 nanofluids on the smooth surface were conducted at the atmospheric pressure. The pool boiling heat transfer performance of boiling heat transfer coefficient (HTC) as a function of heat flux and mass fraction of CeO2/water-based nanofluids have been measured and discussed. In addition, the thermal conductivities, static contact angle of different concentrations of CeO2 were determined. The surface deposition of different concentrations of CeO2 nanofluids after boiling was observed, and the contact angle of deionized water on the deposition surface was measured. From the pool boiling experimental results, it was indicated that CeO2 nanofluids enhanced the boiling HTC. The optimal mass fraction of nanofluids is 0.05%, and the boiling heat transfer coefficient is 36% higher than that of deionized water. The thermal conductivity and the static contact angle increase with the increase of the mass fraction of the nanofluids. In the experimental range, the thermal conductivity increases by 1% at the maximum, while the contact angle of the nanofluid increases from 50.5° to 92.9°. The surface deposition phenomenon increases with the mass fraction of nanofluids, and the contact angle of deionized water on the deposition surface changes greatly (51.4°~134.4°). The influence of the thermal conductivity of the nanofluid can be negligible. The contact angle and the particle deposition on the boiling surface have a greater effect on the enhanced heat transfer of the nanofluid. © All Right Reserved.