作　　者： ; ;

机构地区： 华南理工大学

出　　处： 《华南理工大学学报（自然科学版）》 2000年第2期119-123,共5页

摘　　要： 从气相含率、液体循环速度和体积氧传质系数方面研究气液两相牛顿流体在缩放型导流筒气升式内环流生物反应器内的流体力学与传质特性.内导流筒分别采用传统圆柱型和三种不同结构参数的缩放型,实验介质为空气—水两相牛顿流体系.结果表明,与传统圆柱型导流筒比较,缩放型导流筒气相含率提高10%以上,体积氧传质系数在较大范围内提高.圆柱型导流筒反应器的液体循环量(Ar·ULr)大于各缩放型导流筒反应器的液体循环量.还在Higbie穿透理论和Kolomogoroff各向同性理论的基础上建立了体积氧传质系数与操作条件管结构参数间的关联式. Hydrodynamics and mass transfer of gas_liquid two_phase Newtonian flow in the internal loop airlift bioreactor with a convergence_divergence draft tube were studied in terms of gas holdup, liquid circulation velocity and volumetric mass transfer coefficient. The bioreactor consists of one conventional draft tube and three convergence_divergence draft tubes, experimented with air_water Newtonian system. It was shown that gas holdup of convergence_divergence draft tubes is ten percent higher than that of conventional draft tube, and volumetric mass transfer coefficient of convergence_divergence draft tubes is much higher than that of conventional draft tube. Liquid circulation rate for airlift loop reactors with different convergence_divergence draft tubes is obviously lower than that for airlift loop reactors with a conventional draft tube. The correlation for calculating volumetric mass transfer coefficient, which is correlated by operating conditions and structural parameters, was obtained in combination with Higbie penetration theory and Kolmogoroff theory of isotropic turbulence.

关 键 词： 气液两相牛顿法 缩放型导流筒 内环流反应器

领　　域： [化学工程] [环境科学与工程]