燃气流过有机玻璃圆管内的数值模拟

为了掌握燃气流过有机玻璃圆管的降温情况,以设计出可以实现所要求的燃气出口温度的控温装置,通过建立管内壁热降解瞬态热传导数学模型,得到移动气固交接边界计算网格的速率时间形。基于STAR-CD软件,通过编写用户子程序模拟出管中流体平均体积温度与管内壁面温度之差沿轴向的时间形。在气流与固壁之间的热流量沿轴向一致的条件下,通过加入降解退移速率的第三类热边界条件方程,求解出不同时间管内壁面轮廓沿轴向变化情况,模拟值与试验结果基本吻合。

Numerical simulation of gas through PMMA tube

To design the controlling temperature equipment with desired outlet gas temperature by learning the gas temperature decrease through PMMA tube,transient heat transfer mathematical model of PMMA thermal degradation was established,and the velocity of degradation rate of moving boundary grid between solid and fluid was obtained.STAR-CD software was used to simulate the difference between average volume temperature and interior wall temperature vs.time in axis direction aided by user subroutine programs.The third thermal boundary condition equation joined with the degradation rate of interior wall was used to get the contour of interior wall vs.time under the condition of identical heat flux between fluid and solid in axis direction.The numerical simulation results agrees well with that of measurements.