设计并搭建带冷凝回流的闭合回路沸腾换热实验装置，研究了质量分数为0.000 5%、0.001%、0.002%和0.003%的水基二氧化硅（SiO2）纳米流体、水基石墨烯（GNs）纳米流体、水基和乙二醇水基SiO2与GNs混合（SiO2/GNs-DW,SiO2/GNs-EG-DW）纳米流体沸腾换热性能。结果表明：纳米流体沸腾换热性能高于超纯水；水基SiO2、水基GNs纳米流体质量分数为0.002%时沸腾换热性能最佳，临界热流密度（CHF）分别比超纯水高23.4%和37.8%；相同情况下，最大传热系数（HTC）分别比超纯水高15.7%和39.6%；水基SiO2/GNs纳米流体的CHF和最大HTC随着质量分数增加而增大，质量分数为0.003%时达到最大值，分别比超纯水高48.9%和60.2%；加入不同纳米颗粒对流体沸腾换热性能影响较大，SiO2/GNs纳米流体沸腾换热性能显著高于SiO2纳米流体和GNs纳米流体，GNs纳米流体沸腾换热性能高于SiO2纳米流体；乙二醇水基SiO2/GNs纳米流体与水基SiO2/GNs纳米流体具有相近的CHF。

An experimental closedloop boiling heat transfer device with the reflux condenser was designed and built. The boiling heat transfer properties of waterbased silica(SiO2)nanofluids, waterbased graphene(GNs)nanofluids, and waterbased and ethylene glycol waterbased SiO2 and GNs(SiO2/GNs-DW,SiO2/GNs-EG-DW)mixed nanofluids at mass fractions of 0.000 5%,0.001%,0.002% and 0.003% were studied.The results show that the boiling heat transfer performance of nanofluids is higher than that of ultrapure water. When the mass fraction of waterbased SiO2 and waterbased GNs nanofluids is 0.002%, the boiling heat transfer performance is optimal, and the critical heat fluxes(CHF)are 23.4% and 37.8% higher than those of ultrapure water, respectively.Under the same condition, the maximum heat transfer coefficients(HTC)are 15.7% and 39.6% higher than those of ultrapure water, respectively. The CHF and the maximum HTC of waterbased SiO2/GNs nanofluids increase with the increase of mass concentration and reach the maximum at 0.003%, which are 48.9% and 60.2% higher than those of ultrapure water, respectively.Adding different nanoparticles has great influence on the boiling heat transfer performance of fluid.The boiling heat transfer performance of SiO2/GNs nanofluids is significantly higher than that of SiO2 nanofluids and GNs nanofluids, and the boiling heat transfer performance of GNs nanofluids is higher than that of SiO2 nanofluids. The CHF of ethylene glycol waterbased SiO2/GNs nanofluids is close to that of waterbased SiO2/GNs nanofluids.

TK172

江苏省研究生科研与实践创新计划项目（SJCX20_1464）；船舶涂装排放治理及危废物处理技术与装备研发项目（MC-202003-Z01-07）