铅铋基石墨烯纳米流体热物性研究  

Thermophysical properties of lead-bismuth-based graphene nanofluids

作　　者：杨涛[1,2] 赵鹏程[1,2] 赵亚楠[1,2] 于涛 YANG Tao;ZHAO Pengcheng;ZHAO Yanan;YU Tao(School of Nuclear Science and Technology,University of South China,Hengyang 421001,China;Hunan Engineering&Technology Research Center for Virtual Nuclear Reactor,University of South China,Hengyang 421001,China)

机构地区：[1]南华大学核科学技术学院,衡阳421001 [2]南华大学湖南省数字化反应堆工程技术研究中心,衡阳421001

出　　处：《核技术》2021年第12期85-96,共12页Nuclear Techniques

摘　　要：高热导率的石墨烯纳米颗粒掺进铅铋堆堆冷却剂中可显著提升其导热系数和比热容,从而提高铅铋堆的堆芯功率密度,降低冷却剂用量,有利于实现反应堆小型化和轻量化设计的目的,对于铅铋堆在偏远地区和远海的工程应用具有重要意义。本文通过不同导热系数、黏度、比热容等预测模型对金属基石墨烯纳米流体热物性进行研究,分析纳米流体强化机理,提出适用于铅铋基石墨烯纳米流体的热物性计算模型。研究结果表明:添加石墨烯纳米颗粒的铅铋基,其导热系数、比热容和黏度均得到显著提高。在保证悬浮液相对稳定的情况下,导热系数、比热容和黏度随浓度的添加显著增大,在浓度达到20%时,纳米基液的热导率可以提高80%,但此时的黏度也提升了100%左右,因此在提高浓度的同时应综合考虑对热物性的影响。[Background] The thermal conductivity of graphene nanoparticles doped into the lead bismuth reactor coolant can significantly improve the coefficient of thermal conductivity and specific heat capacity. That will improve the core power of lead and bismuth pile density, reduce the amount of coolant, and ultimately achieve the goal of reducing the reactor volume. It is of great significance for the engineering application of lead bismuth reactor in remote areas and offshore seas. [Purpose] This study aims to investigate the thermophysical properties of leadbismuth-based graphene nanofluids. [Methods] First of all, different thermal conductivity, viscosity, specific heat capacity and other prediction models were employed to study the thermophysical properties of metal-base Graphene nanofluids. The strengthening mechanism of nanofluids was analyzed, then a hermophysical calculation model suitable for lead-bismuth-based graphene nanofluids was put forward. [Results] The results show that the coefficient of thermal conductivity, specific heat capacity and viscosity of lead bismuth matrix with graphene nanoparticles are significantly improved, and the thermal conductivity, specific heat and viscosity increase significantly with the increase of the concentration when the suspension is relatively stable. When the concentration reaches 20%, the thermal conductivity of mickey fluid can be increased by 80%. However, the viscosity is increased by about 100%simultanously. [Conclusions] The influence on thermophysical property should be considered while increasing the concentration of graphene nanofluids.

关 键 词：铅铋堆 石墨烯纳米流体 导热系数 黏度 比热容 

分 类 号：TL33[核科学技术—核技术及应用]