石墨烯纳米片-水纳米流体重力热管的传热性能实验研究  

Experimental Study of Heat Transfer Performance of Gravity Heat Tube Using Graphene Nanoplatelet-Water Nanofluids

作　　者：徐正基 杨峻[1] XU Zheng-ji;YANG Jun(College of Mechanical and Power Engineering,Nanjing Tech University)

机构地区：[1]南京工业大学机械与动力工程学院

出　　处：《化工机械》2020年第6期751-758,共8页Chemical Engineering & Machinery

摘　　要：制备不同充液率和质量分数的石墨烯纳米片-水纳米流体,并以石墨烯纳米片-水纳米流体作为工质,分别应用于玻璃热虹吸管和碳钢重力热管中进行重力热管传热性能实验研究,先后进行可视化实验、传热实验和启动性能实验。从可视化实验可知,加入分散剂、石墨烯纳米片的纳米流体其蒸发量大并且可以改善玻璃热虹吸管的间歇沸腾;传热实验中,30%充液率下0.250%质量分数的石墨烯纳米片-水重力热管的传热性能最好,相较于纯水重力热管输出功率最多能提高8%,传热系数最多可提高15.4%;在启动性能实验中,相对于纯水,纳米流体到达冷凝段花费时间长、冷凝段温度低,纯水重力热管启动速度更快。The graphene nanoplatelet-water nanofluids with different filling rates and mass fractions were prepared and taken as a working fluid in carbon steel gravity heat pipe and glass thermosiphon to implement an experimental study on heat transfer performance of the gravity heat pipe,including the visualization experiment,heat transfer experiment and starting performance test successively.The visualization experiment showed that,the nanofluids with dispersing agent and graphene nanoplatelets has high evaporation and can improve intermittent boiling of the glass thermosiphon;in the heat transfer experiment,the graphene nanoplatelet-water gravity heat pipe with 0.250%mass fraction and at 30%filling rate has better heat transfer performance and can increase the output power by 8%at most compared with the water gravity heat pipe along with a thermal conductivity increased by 15.4%at most;in the starting performance test and compared to the water gravity heat pipe,the nanofluids within the nanofluids heat pipe requires a longer time to reach condensation section,and for the condensation section with lower temperature,the water gravity heat pipe can start faster.

关 键 词：重力热管 传热 纳米流体 石墨烯纳米片 可视化实验 传热实验 启动性能实验 

分 类 号：TQ051.1[化学工程]