本文以管肋式熔盐相变蓄热结构为对象,将相变材料填充入高孔隙率泡沫金属中以弥补熔盐导热系数低的缺陷.考虑周期性边界和重力方向相邻结构的影响,以三层管肋式结构代替整个系统建立多孔介质固 液相变输运三维物理数学模型.利用数值模拟方法,探讨在重力环境中,管式加热条件下相变材料蓄热过程的传热性能.揭示出相变界面随时间的演化,以及自然对流对蓄热过程的作用机制;讨论了泡沫金属、肋片参数及加热温度对蓄热能力的影响.
The model proposed by this paper is based on the traditional tube-shell thermal energy storage device,and metal foam and fins are used to enhance the effective conductivity of phase change material (PCM).Considering the influence of periodic boundary conditions and adjacent structures in gravity direction,three-dimensional physico-mathematical model is established for representative element extracted from TESS (thermal energy storage system).The thermal behavior of this model in charging mode is analyzed under the condition of heated in inner surface by numerical method.The temporal evolution of melt front locations is explored and the natural convection mechanism of action to phase-change process is revealed.The effects of design parameters,including metal foam pore density and porosity,configuration of fin and Rayleigh number,on melting and solidifying rate and energy stored in each time step are documented and discussed.
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