摘要
主要从气相含率、液体循环速度和体积氧传质系数方面，研究气液两相非牛顿流体在缩放型导流简气升式内环流反应器的流体力学与传质特性．内导流筒分别采用一种传统圆柱型和三种不同结构参数的缩放型，实验条件为空气－ＣＭＣ两相非牛顿流系统．实验结果表明，与传统圆柱型导流筒相比较，缩放型导流简气相含率和体积氧传质系数均显著提高．在ＣＭＣ浓度分别为０ｍｇ／Ｌ、 １００ｍｇ／Ｌ、 １５０ ｍｇ／Ｌ及２００ ｍｇ／Ｌ的情况下，同一内管反应器随着介质粘度的增加，气相含率、液体循环速度和体积氧传质系数均下降．
Hydrodynamics and mass transfer of gas-liquid two-phase non-Newtonian fluid in an internal loop airlift reactor with a convergence-divergence draft tube are studied in terms of gas holdup, liquid circulation velocity and volumetric mass transfer coefficient. The reactor consists of one conventional draft tube and three convergence-divergence draft tubes, experimented with air-CMC solution system. It is shown that gas holdup and volumetric mass transfer coefficient of convergence-divergence draft tubes are much higher 'than those of conventional draft tube. At the same superficial gas velocity, gas holdup, liquid circulation and volumetric mass transfer coefficient decrease with CMC solutions under the same draft tube. Based on Higbie penetration theory and Kolomogoroff theory of isotropic turbulence, the correlation for calculating volumetric mass transfer coefficient is established, which is correlated by operating conditions and structural parameters.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2000年第7期1-5,共5页
Journal of South China University of Technology(Natural Science Edition)
基金
国家教育部跨世纪优秀人才培养计划基金资助项目
国家自然科学基金资助项目(29407051)
广东省自然科学基金资助项目(940758)
关键词
气液两相非牛顿流
缩放型导流筒
流体力学
传质
gas-liquid two-phase non-Newtonian flow
convergence-divergence draft tube
Hydrodynamics
mass transfer
