Abstract Pool boiling experiments of water-based α-Fe2O3 and γ-Fe2O3 nanofluids with different concentrations (0.005–0.100 g/L) were conducted at atmospheric pressure. Two kinds of magnetic field induced by two neodymium magnets were also applied to investigate the effects of magnetic field on the pool boiling of nanofluids. It demonstrated that the magnetic field could change the local concentration of nanofluids and produce an extra pressure on the bubble boundary. The extent of the effects was not only dependent on the intensity and distribution of magnetic field, but also the magnetism and concentration of nanoparticles. For the 0.050 g/L γ-Fe2O3 nanofluid in the presence of magnetic field induced by two mutually exclusive magnets, an enhancement in boiling heat transfer coefficient up to 28% was obtained. The results of the experiments indicated the feasibility to control the pool boiling performance of magnetic nanofluids by external magnetic field.

中文翻译：

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磁场对水基α-Fe2O3和γ-Fe2O3纳米流体池沸腾传热的影响

摘要 在大气压下进行了不同浓度（0.005-0.100 g/L）的水基α-Fe2O3和γ-Fe2O3纳米流体的池沸腾实验。还应用由两个钕磁铁感应的两种磁场来研究磁场对纳米流体池沸腾的影响。它表明磁场可以改变纳米流体的局部浓度并在气泡边界上产生额外的压力。影响的程度不仅取决于磁场的强度和分布，还取决于纳米颗粒的磁性和浓度。对于 0.050 g/L γ-Fe2O3 纳米流体，在两个相互排斥的磁体产生磁场的情况下，沸腾传热系数提高了 28%。