CAJ | 학술논문

采用基于颗粒动力学的双流体模型对FCC颗粒湍动床和挡板床内气固流动进行模拟研究，考察颗粒相壁面边界条件对其气固流动的影响。研究结果表明，采用Johnson-Jackson壁面边界条件描述壁面与颗粒的相互作用时，壁面反射系数对气固流动行为影响较大，而颗粒-壁面碰撞恢复系数影响甚微。通过将模拟结果与实验数据对比，确定壁面反射系数取0.001时能较好地描述壁面与颗粒间的作用力。对于挡板床，挡板的加入增大了壁面面积，壁面对颗粒的作用力更加显著，挡板壁面采用部分滑移条件时，穿过导向挡板向上和向下运动的颗粒数量均较大于采用无滑移条件时的结果。挡板壁面的光滑程度对其在床层中的作用有一定影响。
채용기우과립동역학적쌍류체모형대FCC과립단동상화당판상내기고류동진행모의연구，고찰과립상벽면변계조건대기기고류동적영향。연구결과표명，채용Johnson-Jackson벽면변계조건묘술벽면여과립적상호작용시，벽면반사계수대기고류동행위영향교대，이과립-벽면팽당회복계수영향심미。통과장모의결과여실험수거대비，학정벽면반사계수취0.001시능교호지묘술벽면여과립간적작용력。대우당판상，당판적가입증대료벽면면적，벽면대과립적작용력경가현저，당판벽면채용부분활이조건시，천과도향당판향상화향하운동적과립수량균교대우채용무활이조건시적결과。당판벽면적광활정도대기재상층중적작용유일정영향。
The two-fluid model incorporating granular kinetic theory was applied to simulate the gas-solid flow in FCC particles turbulent bed, and to investigate the effect of solid phase wall boundary condition on the predicted gas-solid flow behavior. The results showed that when the Johnson-Jackson boundary condition was used to describe the interaction between wall and particles, the specularity coefficient had a pronounced influence on flow behavior, while the particle-wall restitution coefficient played a minor role. The comparison of simulated results with experimental data indicated that the specularity coefficient of 0.001 was opportune to describe the interaction between wall and particles. For the turbulent fluidization bed with baffles, the introduction of baffles increased the wall area, leading to a strong interaction between wall and particles. When the partial-slip wall condition was used to deal with the wall of baffles, the predicted quantity of particles which passed through the baffles was more than that when the no-slip wall condition was used. The characteristic of baffles wall had some impact on its role played in fluidization beds.