垂直多孔通道中的变质量流动

Variable-mass Flow through the Vertical Perforated Channels

导出了在垂直圆形多孔通道中的分流和合流流动含重力项的动量交换方程. 通过大型冷模实验,得出了分流、合流在向上流动、向下流动时的静压分布和虚拟压强分布,应用黄金分割法进行一维搜索,得出了实验条件下分流、合流的动量交换系数为0.77和1.26,平均相对误差分别为10%和15%. 结果说明表观气速较小时,重力的影响不能忽略.

The momentum equation with gravity considered was applied to describe the variable-mass flow in the vertical perforated channel for radial packed reactors. The profiles of pressure and the virtual pressure along the perforated channels were measured for upward and downward flows in the distributor or collector on large scale mock-up. Under the experimental conditions, the coefficients of momentum exchange for distribution and collection were calculated to be equal to 0.77 with the average relative error of 10% and 1.26 with the average relative error of 15% respectively. It is concluded that gravity can not be neglected as the mass velocity is relatively small.