氧化石墨烯还原前后对脉动热管传热的影响  

Effect of graphene oxide reduction on thermal performance of pulsating heat pipe

作　　者：沈俊杰 杨洪海[1] 张苗 李勇[1] 尹勇 陈子豪 何伟琪 张田田 SHEN Junjie;YANG Honghai;ZHANG Miao;LI Yong;YIN Yong;CHEN Zihao;HE Weiqi;ZHANG Tiantian(College of Environmental Science and Engineering,Donghua University,Shanghai 201600,China)

机构地区：[1]东华大学环境科学与工程学院,上海201600

出　　处：《化学工程》2023年第9期43-48,共6页Chemical Engineering(China)

摘　　要：工业生产中主要通过化学方法将GO(氧化石墨烯)还原,制备RGO(还原氧化石墨烯)。文中将GO及RGO应用于PHP(脉动热管),分析比较它们的结构及热物性,及其对PHP启动和传热的影响。采用闭式3回路铜制PHP,垂直强制风冷散热,蒸发段电加热功率范围10—105 W。PHP充液率约50%,GO及RGO纳米流体质量分数均为0.05%。研究表明:在水中添加GO及RGO有助于改善PHP的启动及传热。加热功率为20 W时,GO及RGO纳米流体的强化作用率分别为37.4%和16.7%。随着加热功率的增加,强化作用有所下降。对于RGO纳米流体,当加热功率为105 W时,强化作用基本消失。与RGO相比,GO纳米流体的强化作用更大。主要归因于GO纳米流体湿润性、分散性及稳定性较好,表面张力及黏度较小。Industrial production uses chemical methods to reduce GO(graphene oxide)to prepare RGO(reduced graphene oxide).GO and RGO were applied to PHP(pulsating heat pipe)and their structure and thermophysical properties were analyzed and compared,as well as their impacting on PHP start-up and heat transfer.The closed 3-circuit copper PHP was adopted,and the vertical forced air cooling was used for heat dissipation.The electric heating power range of evaporation section was 10-105 W.The filling rate of PHP was about 50%,and the mass fraction of GO and RGO nanofluids was 0.05%.The results show that the addition of GO and RGO in water can improve the start-up and heat transfer of PHP.At 20 W,their enhancements to the thermal performance achieve 37.4%and 16.7%respectively.As the heat input increasing,enhancements of the nanofluids decrease gradually.For RGO nanofluids,when the heating power is 105 W,the strengthening effect basically disappears.Compared with RGO nanofluids,GO nanofluids show greater enhancement.This is mainly due to the good wettability,dispersion and stability of GO nanofluids,as well as the low surface tension and viscosity.

关 键 词：氧化石墨烯 纳米结构 物性 脉动热管 传热 流动 

分 类 号：TK79[动力工程及工程热物理—流体机械及工程]