泡沫金属复合PCM微结构传热储热过程模拟  

Simulation on heat transfer and thermal storage processes of foamed metal composite PCM microstructure

作　　者：徐祥贵 王丽琼[1] 王君雷 王燕 黄巧 黄云[2,3] XU Xianggui;WANG Liqiong;WANG Junlei;WANG Yan;HUANG Qiao;HUANG Yun(State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China;State Key Laboratory of Multiphase Complex Systems,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China;School of Chemical Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]北京理工大学爆炸科学与技术国家重点实验室,北京100081 [2]中国科学院过程工程研究所多相复杂系统国家重点实验室,北京100190 [3]中国科学院大学化学工程学院,北京100049

出　　处：《化工学报》2021年第2期956-964,共9页CIESC Journal

基　　金：国家自然科学基金面上项目项目(21975262);国家重点研发计划项目(2017YFB0903601);中国科学院洁净能源先导科技专项(XDA21070302);多相复杂系统国家重点实验室自主研究课题(MPCS-2019-A-10)。

摘　　要：以石蜡作为相变材料(PCM),采用六面通圆孔三维结构模型,对泡沫金属复合PCM内相变熔化过程进行了数值模拟。研究了不同材料(Cu、Al、Ni、Fe)泡沫金属孔密度和孔隙率对复合PCM传热和储热性能的影响。结果表明,泡沫金属复合PCM传热过程受热传导和自然对流作用综合影响;随孔密度增加,复合PCM完全熔化时间缩短幅度逐渐减小,且泡沫金属热导率越高,孔密度对传热速率影响越大;泡沫金属复合PCM内存在非热平衡现象,孔密度和孔隙率增加均可减小最大平均温差,但对最终平衡时间的影响却截然不同;此外,泡沫金属复合PCM单位质量储热密度随孔隙率增大而增大,相比泡沫Cu、Ni、Fe复合PCM,泡沫Al复合PCM的单位质量储热密度较大,增加速率也较大。Paraffin wax is used as the phase change material(PCM),and the three-dimensional structure model of six-sided round holes is used to numerically simulate the phase change melting process of the foam metal composite PCM.The effects of different metal foam materials(Cu,Al,Ni,Fe),pore density and porosity on the heat transfer and heat storage performance of composite PCM were studied by monitoring the liquid phase fraction and total heat storage during the phase change interface evolution.The results show that the heat transfer process of foamed metal composite PCM is affected by heat conduction and natural convection.The complete melting time of composite PCM can be shortened and heat transfer can be accelerated by increasing pore density,but the shortening range decreases with the increase of pore density and the higher the thermal conductivity of the foam metal,the greater the influence of pore density on the heat transfer rate.Thermal non-equilibrium phenomenon exists in the foamed metal composite PCM,and the increase of pore density and porosity can both reduce the maximum average temperature difference,but the effect on the final equilibrium time is quite different.Increasing pore density can shorten the final equilibrium time,while increasing porosity will prolong the final equilibrium time.In addition,the heat storage density per unit mass of foam metal composite PCM increases with the increase of porosity.Compared with foam Cu,Ni and Fe composite PCM,foam Al composite PCM has a higher heat storage density per unit mass and a higher rate.

关 键 词：泡沫金属 复合材料 相变 微结构 传热储热 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]