铜表面-氧化石墨烯纳米涂层池沸腾换热特性实验  

Experimental Study on Pool Boiling Heat Transfer Characteristics of Graphite Oxide Nano Coating on Copper Surface

作　　者：王雪鉴 袁朝飞 赵亚楠 于涛[1] WANG Xuejian;YUAN Chaofei;ZHAO Yanan;YU Tao(School of Nuclear Science and Technology,University of South China,Hengyang 421001,China;Nuclear Power Institute of China,Chengdu 610213,China)

机构地区：[1]南华大学核科学技术学院,湖南衡阳421001 [2]中国核动力研究设计院,四川成都610213

出　　处：《原子能科学技术》2024年第5期1033-1039,共7页Atomic Energy Science and Technology

基　　金：国家自然科学基金(12205142);湖南省教育厅优秀青年项目(20B490)。

摘　　要：石墨烯材料因其优异的导热性能和化学惰性,在核反应堆先进换热设备领域有很大的应用前景。为探索石墨烯材料的强化换热性能,本文采用沸腾沉积法制备氧化石墨烯纳米涂层,开展了氧化石墨烯涂层-去离子水池沸腾换热特性实验。氧化石墨烯纳米流体工质浓度为0.001、0.003、0.005 mg/mL,加热时间控制为1 h和2 h,通过沸腾沉积在裸露铜表面制备6种氧化石墨烯涂层。以此为基础开展池沸腾实验,结果发现氧化石墨烯涂层对池沸腾换热系数的影响很小,但可显著增强池沸腾临界热流密度。从涂层表面润湿性、热导率及形貌结构变化等角度分析了氧化石墨烯涂层对池沸腾换热特性的影响机理。Graphene materials have great application prospects in the field of advanced heat transfer equipment for nuclear reactors due to their excellent thermal conductivity and chemical inertia.In order to explore the enhanced heat transfer performance of graphene materials,boiling deposition method to prepare graphene oxide nanocoatings was used in this paper.The working fluid concentrations of graphene oxide nanofluids are 0.001,0.003 and 0.005 mg/mL,and the heating time is controlled at 1 hours and 2 hours.Six types of graphene oxide coatings were prepared on exposed copper surfaces through boiling deposition.The coating surface was observed through optical photography and scanning electron microscopy(SEM).By comparing and analyzing the influence of graphite oxide coating on surface morphology characteristics,it is found through optical photos that the deposition of graphene oxide on the copper surface shows an uneven spot like distribution.With the increase of nanofluid concentration and preparation time,the coverage gradually increases.When the preparation time is 2 hours,the graphene oxide coating completely covers the substrate copper surface.The deposition of graphene oxide on the copper surface exhibits an uneven spotted distribution.Through scanning electron microscopy analysis,it is found that the uneven spots are the vaporization core during boiling.By using X-ray energy dispersive spectroscopy(EDS)to scan the element content distribution in the spot area along a straight line,it is found that the carbon element content in the vaporized core is the lowest,and the carbon element content around it first increases and then decreases.These indicate that the deposition of graphene oxide nanofluid occurs through the phase transition at the bottom of the bubble,which is the reason for the non-uniform distribution of the deposition layer spots.Using the above graphene oxide coating for pool boiling experiments,it is found that when the coverage rate of graphene oxide coating is low,its impact on pool boiling heat tr

关 键 词：氧化石墨烯 表面特性 池沸腾 换热特性 临界热流密度 

分 类 号：TL332[核科学技术—核技术及应用]