Chemical Engineering Science ( IF 4.7 ) Pub Date : 2022-07-21 , DOI: 10.1016/j.ces.2022.117926 Wenjian Cai , Luning Li , Ri Cao , Sibo Yang , Huilin Lu
Hydrodynamics of sub- and super-critical ethanol fluid and particles were simulated using a low density ratio kinetic theory of granular flow in fluidized beds. The coexistence of a wave-like flow near the bottom and chunk-like flow at the upper part was observed in subcritical ethanol fluidized beds. During the fluidization of supercritical ethanol fluid-particle mixtures, aggregate-like structures of particles were found with increasing ethanol fluid temperatures and decreasing ethanol fluid pressures in supercritical ethanol fluidized beds. The simulated fluidization states identified reasonably with predictions using three different dimensionless numbers and stability function according to kinematic wave and dynamic wave velocities. The predicted bed expansion heights agreed with experimental data in supercritical carbon dioxide fluidized beds.
中文翻译:
基于颗粒流低密度比动力学理论的超临界乙醇流体-颗粒流化流体动力学
使用流化床中颗粒流动的低密度比动力学理论模拟了亚临界和超临界乙醇流体和颗粒的流体动力学。在亚临界乙醇流化床中观察到底部附近的波浪状流动和上部的块状流动并存。在超临界乙醇流体-颗粒混合物的流化过程中,随着乙醇流体温度的升高和超临界乙醇流化床中乙醇流体压力的降低,发现了颗粒的聚集状结构。根据运动波和动态波速,使用三个不同的无量纲数和稳定性函数预测合理地识别模拟流化状态。预测的床膨胀高度与超临界二氧化碳流化床的实验数据一致。