摘要
为得到混合熔盐在单罐蓄热系统内的相变传热规律,本文针对具有低熔点的四元混合硝酸盐展开研究,采用VOF与焓-多孔介质耦合模型对底部加热条件下蓄热单元内相变材料(PCM)的相变蓄热过程进行模拟,并利用实验进行验证。结果表明:相变过程中罐内出现明显温度分层现象,固液界面出现波动。蓄热单元中所产生的自然对流强弱直接影响热量传递,同时固液相界面的位置决定自然对流的发展。本文研究结果对相变材料的高效利用与单罐蓄热系统的优化提供理论依据。
To obtain the phase change heat transfer mechanism of molten salt in single energy storage tank, quaternary mixed nitrate with low-melting-point is studied. A VOF and enthalpy-porosity coupled model is used to simulate the phase change process of phase change material （PCM） in the thermal storage unit under the condition of bottom heating, which is verified by experiments. The results show that the obvious temperature stratification and a fluctuation of the solid-liquid interface can be observed during the melting process. Heat transfer is directly affected by the natural convection intensity, and the position of the solid-liquid interface determines the development of the natural convection. The results in this paper can be a base for the efficient utilization of PCM and the optimization of single-tank thermal storage system.
作者
彭达文
鹿院卫
于强
刘丽华
吴玉庭
PENG Da-Wen;LU Yuan-Wei;YU Qiang;LIU Li-Hua;WU Yu-Ting(Key Laboratory of Enhanced Heat Transfer and Energy Conservation,Ministry of Education and Key Laboratory of Heat Transfer and Energy Conversion,Beijing Municipality,Beijing University of Technology,Beijing 100124,China;Beijing Municipal Administration of Senior Technical School,Beijing 102600,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2018年第10期2264-2270,共7页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.51576006)
国家重点研发计划项目(No.2017YFB0903603)
关键词
相变蓄热
混合熔融盐
数值模拟
phase change heat storage
mixed molten salt
numerical simulation
