摘要
引用焓计算单元和固相分数两个概念,利用有限元离散焓方程对具有对流边界条件的一维相变导热问题作了讨论。所有参数均以无量纲形式给出。计算结果表明,当Ste(斯蒂分数)>0.2时,无论是相变界面,还是温度随时间的变化曲线均消除了传统焓法求解相变问题时常见的台阶状波动。
The enthalpy method combined with finite element discretization eliminates the common staircase like oscillations on interfacc-time curves in traditional enthalpy methods for the solution of phase change problems by adopting two concepts, the 'enthalpy calculating cell' and the 'fraction solid'. It is valid for phase change problems of two different kinds of boundary conditions. All parameters used are given in nondimensional forms to facilitate the discussion about the influcnce of Bi and Ste on such problems.
基金
国家自然科学基金
关键词
传热
相变
焓法
有限元法
对流边界
heat transfer
phase change
enthalpy method
finite element method(FEM)
