固液相变蓄能中有效导热系数的数值分析与实验研究  

RESEARCH ON EFFECTIVE THERMAL CONDUCTIVITY OF ENERGY STORAGE SYSTEM WITH SOLID-LIQUID PHASE CHANGE BY NUMERICAL ANALYSIS AND EXPERIMENTS

作　　者：曾艳[1] 田怀璋[1] 余鹏[1] 陈林辉[1] 陈敬良[1] 

机构地区：[1]西安交通大学能动学院,西安710049

出　　处：《太阳能学报》2003年第4期497-503,共7页Acta Energiae Solaris Sinica

摘　　要：引入有效导热系数经验公式[3],使固液蓄能数学模型得以简化为仅用能量方程加以描述。运用热焓法求解能量方程,得到计算相变位置随时间变化曲线。并通过实验测得相变过程的实际温度场,得到实验相变位置随时间变化曲线。二者比较,证明了自然对流对固液相变换热的影响不可忽略,验证了该公式在Ra<1010,Pr<105下的正确性。The empirical formula of effective thermal conductivity was introduced, the math model of energy storage system with solid-liquid phase change was simplified to be described by the energy equation only. The curve of the change of solid-liquid interface displacement versus time can be obtained using enthalpy method. The temperature fields of actual phase change process and the actual curve can be gained by the experiments. The comparison of the two results proves that the effect of natural convection on phase change can not be neglected and the empirical formula is correct in the range of Ra10,Pr5.

关 键 词：有效导热系数 固液相变蓄能 数学模型 液相率 界面移动速率 

分 类 号：TK512.4[动力工程及工程热物理—热能工程]