圆管内氧化石墨烯MPCM悬浮液对流传热实验研究  

Experimental research on heat transfer of microencapsulated phase change materials slurry containing GO in circular tube

作　　者：鲁进利[1] 陈星雨 韩亚芳[1] 孙彦红 尹子杰 吴丽 Jinli LU;Xingyu CHEN;Yafang HAN;Yanhong SUN;Zijie YIN;Li WU(School of Civil Engineering and Architecture,Anhui University of Technology,Ma'anshan,Anhui 243032,China;China Electronic Systems Engineering No.2 Construction Co.,Ltd.,Wuxi,Jiangsu 214000,China)

机构地区：[1]安徽工业大学建筑工程学院,安徽马鞍山243032 [2]中国电子系统工程第二建设有限公司,江苏无锡214000

出　　处：《过程工程学报》2023年第1期38-45,共8页The Chinese Journal of Process Engineering

基　　金：安徽省自然科学基金资助项目(编号:1508085QE95,2008085QE256);国家自然科学基金资助项目(编号:51306002);大学生创新创业项目(编号:S202110360220)。

摘　　要：由于氧化石墨烯(GO)的高热导率特性,将其添加至相变微胶囊颗粒内,以提高以其为基材制备的悬浮液的热导率,从而进一步强化传热。分别测试了纯水、5wt%相变微胶囊悬浮液(MPCMS)、5wt%和10wt%复合氧化石墨烯的相变微胶囊悬浮液(GO-MPCMS)的传热特性,分析讨论了壁面热流密度、雷诺数(Re)等参数的影响。结果表明,由于相变过程的影响,圆管壁面和流体温度分布呈现上升、平直、上升的变化规律;相同实验条件下,当工质为悬浮液时壁面温度与流体温度比纯水低;颗粒浓度和GO均对传热产生较大影响,相同质量分数(5wt%)时,添加GO时可使稳定后的局部努塞尔数(Nux)进一步提升8个百分点,颗粒质量分数由5wt%增至10wt%时,Nux又增加了20个百分点;与纯水相比,同时考虑GO和微胶囊颗粒的影响,相同实验条件下,相变微胶囊悬浮液平均努塞尔数(Nu)可提升1.0~2.0倍。Phase change energy storage technology can solve the problem of energy mismatch in time and space due to the latent heat absorption or release in phase change process.It has a wide application in solar energy utilization,building energy saving,waste heat recovery,and other fields.However,the phase change material has leakage problem in the process of use,so the phase change material is encapsulated and mixed with the single-phase fluid to prepare the microencapsulated phase change materials slurry(MPCMS).Furthermore,due to the high thermal conductivity properties of graphene oxide(GO),it was added to MPCM to improve the thermal conductivity of suspension prepared from GO as the substrate,thus further enhancing heat transfer.In this work,the heat transfer characteristics of pure water,5wt%mass fraction of traditional MPCMS,5wt%and 10wt%mass fraction of graphene oxide composite microencapsulated phase change material suspension(GO-MPCMS)were tested.And the effects of wall heat flux and Reynolds number(Re)on temperature distribution and heat transfer were analyzed and discussed.The results showed that,the temperature distribution of the tube wall and fluid presented the changing law of rised first,then stay flat and then rised again due to the influence of the phase change process.And under the same experimental conditions,the wall temperature and fluid temperature of suspension were lower than pure water.Both particle mass fraction and GO had great influence on heat transfer.With the same mass fraction(5wt%),the stable local Nusselt number(Nux)can be further increased by 8 percentage point when GO was added,and the Nuxincreased 20 percentage point when the particle mass fraction was increased from 5wt%to 10wt%.Compared with pure water,considering the influence of GO and microencapsulated particles,the average Nusselt number(Nu)of microencapsulated phase change material suspension can be increased by 1.0~2.0 times under the same experimental conditions.

关 键 词：潜热型功能热流体 氧化石墨烯 相变微胶囊 对流传热 实验研究 

分 类 号：TQ127.11[化学工程—无机化工] TK124[动力工程及工程热物理—工程热物理]