Three-dimensional CFD simulation of the system inlet and outlet boundary condition effects inside a high solid particle flux circulating fluidized bed riser
Three-dimensional CFD simulation of the system inlet and outlet boundary condition effects inside a high solid particle flux circulating fluidized bed riser
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DOI：
10.1016/j.powtec.2013.04.026
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发表时间：
2013-09
影响因子：
5.2
通讯作者：
B. Chalermsinsuwan;Yongyoot Prajongkan;P. Piumsomboon
中科院分区：
文献类型：
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作者：
B. Chalermsinsuwan;Yongyoot Prajongkan;P. Piumsomboon
在本研究中，基于高固体颗粒通量循环流化床立管内的三维计算流体动力学 (CFD) 模拟，研究了改变系统入口和出口边界条件的影响。考虑了四种可能的系统入口边界条件，将气体入口通道尺寸改变为最大直径的 25%（情况 1）、50%（情况 2）、75%（情况 3）和 100%（情况 4），与系统通道（分别为 0.050、0.100、0.150 和 0.200 m）相比。随着气体入口通道尺寸的增加，系统内的固体体积分数降低。通过将出口半径从 0.025 m 更改为 0.050、0.075 或 0.100 m 来改变系统出口边界条件，结果表明系统内的固体体积分数随着出口半径的减小而增加。这些结果与实验和二维 CFD 模拟相比较。此外，还讨论了网格尺寸或计算单元、时间平均范围和计算流体动力学模拟尺寸的影响。
In this study, the effects of varying the system inlet and outlet boundary conditions were investigated based on three-dimensional computational fluid dynamics (CFD) simulation inside a high solid particle flux circulating fluidized bed riser. Four possible system inlet boundary conditions were considered with varying the gas inlet channel size at 25% (case 1), 50% (case 2), 75% (case 3) and 100% (case 4) of the maximal diameter compared to the system channel (0.050, 0.100, 0.150 and 0.200 m, respectively). The solid volume fraction inside the system decreased as the gas inlet channel size increased. Varying the system outlet boundary conditions by changing the outlet radius from 0.025 m to 0.050, 0.075 or 0.100 m revealed that the solid volume fraction inside the system increased with decreasing outlet radii. These results compare well to those experimental and two-dimensional CFD simulations. In addition, the effects of mesh sizes or computational cells, time-averaged ranges and computational fluid dynamics simulation dimensions were discussed.