Analysis of flow characteristic on bubbling fluidized bed using SPH Method

对鼓泡流化床内空气和颗粒的运动进行了数值模拟。在SP方法中，偏微分方程，这是颗粒相的流场的控制方程，被转化为常微分方程，这是拉格朗日型方程。常微分方程的数值分析比偏微分方程的数值分析容易得多。此外，拉格朗日分析适合于描述离散颗粒的特性。同时求解了Navier-Stokes方程和Lagrangian型方程。并进行了相应的实验。结果表明，计算结果较好地描述了实验得到的颗粒瞬时位置，并使我们能够了解鼓泡流化床中气泡的形成、合并和破裂的机理。

Air and Particle motions in a bubbling fluidized bed are numerically simulated using Smoothed Particle (SP) method for the particle phase. In the SP method, the partial differential equations, which are the governing equations for the flow fields of the particle phase, are transformed to the ordinary differential equations, which are Lagrangian-type equations. The numerical analysis of ordinary differential equations is much easier than that of partial differential equations. Moreover, Lagrangian analysis is suitable for the description of the characteristics of discrete particles. The Navier-Stokes equation and the Lagrangian type equation were simultaneously solved. The corresponding experiments were also performed. It is found that calculated results describe well the experimental instantaneous particle positions, and enable us to know the mechanisms of bubble formation, bubble coalescence and bubble disruption in a bubbling fluidized bed.