A second-order moment kinetic frictional stress model coupled with a non-spherical drag coefficient between particle and gas phases is proposed to model the hydrodynamics of non-spherical particle flow in downer reactor. The heterogeneous dispersions of particle and the Reynolds stresses between gas and particle are numerically simulated. Results show that predictions are in good agreement with the experimental data. An increase in irregular shape degree leads to the enlargement for the dense ring of particle volume fraction, the particle velocity and its fluctuation, the normal and shear stress, and the granular temperature, as well as the encouragement of granular temperature peaks towards wall region. Strongly heterogeneous characteristics are found at the second acceleration region, which the amplitudes of normal and shear stresses are approximately twice larger than those of fully development flow. Higher heterogeneous indexes correspond to the homogeneous flow, and its larger gradient indicates that hydrodynamics is transiting from homogenous to heterogenous flow. Frequency of article collisions is on the order of 10².

提出了一个二阶矩动摩擦应力模型，结合颗粒和气相之间的非球形阻力系数，以模拟下行反应器中非球形颗粒流动的流体动力学。数值模拟了颗粒的非均质分散和气体与颗粒之间的雷诺应力。结果表明，预测与实验数据非常吻合。不规则形状程度的增加导致颗粒体积分数、颗粒速度及其波动、法向和剪切应力、颗粒温度的致密环增大，以及颗粒温度峰值向壁区域的鼓励。在第二加速区域发现了强烈的异质特征，其法向和剪应力的幅度大约是完全发展流动的幅度的两倍。较高的非均质指数对应于均质流，其较大的梯度表明流体动力学正在从均质流过渡到非均质流。物品碰撞的频率约为 10² .