摘要
针对针翅管式相变蓄热装置的特点,建立三维针翅管相变传热过程的物理模型和数学模型,采用有限容积法,并结合"焓—多孔度"技术,数值模拟了相变材料在三维针翅管结构中融化和凝固的瞬态传热过程。揭示了相变材料固化过程界面移动规律,并与光管传热性能进行对比,研究表明:针翅管的换热性能远强于光管,且随着针翅高度、宽度、厚度以及每圈针翅数目的增加随着针翅高度、宽度、厚度以及每圈针翅数目的增加蓄热介质完成相变过程所需要的时间均有不同程度的减少,且翅高对强化换热影响最大,翅厚影响最小。模拟与Sparrow试验吻合很好。为优化蓄热器设计参数提高换热效率提供一定的理论依据。
According to character of phase change thermal energy equipment of pin-fin tube, it has been established that three- dimension physical model and mathematical model of phase change heat transfer of pin-fin tube. With finite volume method and ＂Enthalpy-porosity＂ technology, transient heat transfer process of melting and solidification about phase change material in three- dimension pin-fin tube was simulated. At the same time,it is revealed that movement law of curing process interface of phase change material and it compares with heat transfer performance of light-tube. It is showed that heat transfer performance of pin-fin tube is much more than light-tube＇ s. With the height,width,thickness and pin-fin number of pin-fin tube increased,the time that heat storage medium completes phase change is inordinately reduced and the fin height greatly impacts on heat transfer and fin thickness little impacts. Simulation accords with the sparrow experiment. It can provide a theory basis for optimizing the design parameters of heat accumulator and improving the efficiency of heat transfer.
出处
《流体机械》
CSCD
北大核心
2010年第12期64-68,22,共6页
Fluid Machinery
关键词
针翅管
相变传热
焓-多孔度
数值模拟
pin-fin tube
phase change heat transfer
enthalpy-porosity
numerieal simulation
