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Numerical simulation of gas-particle flow with a second-order moment method in bubbling fluidized beds

机译:鼓泡流化床中二阶矩法的气固两相流数值模拟

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摘要

Flow behavior of gas and particles is performed by means of gas-solid two-fluid model with the second-order moment model of particles in the bubbling fluidized bed. The distributions of velocity and moments of particles are. predicted in the bubbling fluidized beds. Predictions are compared with experimental data measured by Jung et al. (2005) in a bubbling fluidized bed and Patil et al. (2005) experiments in a bubbling fluidized bed with a jet. The simulated second-order moment in the vertical direction is on average 1.5-2.3 times larger than that in the lateral direction in the bubbling fluidized bed (Jung et al., 2005). For a bubbling fluidized bed with a jet, the ratio of normal second-order moment in the vertical direction to in the lateral direction is in the range of 0.5-2.5 (Patil et al., 2005). The bubblelike Reynolds normal stresses per unit bulk density used by Gidaspow et al. (2002) are computed from the simulated hydrodynamic velocities. The simulated bubblelike Reynolds normal stresses in the vertical direction is on average 4.5-6.0 times larger than that in the lateral direction in the bubbling fluidized bed (Jung et al., 2005). The predictions are in agreement with experimental second-order moments measured by Jung et al. (2005) and porosity measured by Patil et al. (2005).
机译:气体和颗粒的流动行为是通过气固双流模型和鼓泡流化床中颗粒的二阶矩模型来进行的。粒子的速度和矩的分布是。预计在鼓泡的流化床中。将预测结果与Jung等人测量的实验数据进行比较。 (2005年)在沸腾的流化床和帕蒂尔等。 (2005年)在带有喷嘴的鼓泡流化床中进行实验。在鼓泡流化床中,垂直方向的模拟二阶矩平均比横向方向大1.5-2.3倍(Jung等,2005)。对于带有射流的鼓泡流化床,垂直方向上的正常二阶矩与横向方向上的正常二阶矩之比在0.5-2.5的范围内(Patil等,2005)。 Gidaspow等人使用的气泡状雷诺每单位堆积密度的法向应力。 (2002年)是从模拟的水动力速度计算。在起泡的流化床中,模拟的气泡状雷诺法向垂直应力在垂直方向上平均比横向方向大4.5-6.0倍(Jung等,2005)。这些预测与Jung等人测量的实验二阶矩一致。 (2005年)和孔隙度由帕蒂尔等。 (2005)。

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