摘要
CO2气泡群在液相中的传质在化工过程中广泛存在。对CO2气泡群在3种不同流体(牛顿流体、非弹性剪切变稀流体和黏弹性剪切变稀流体)中的气液传质过程进行了研究。利用CO2探针测定了不同操作条件下CO2的体积传质系数,考察了液相浓度,气体流量以及流变性质对体积传质系数的影响。结果表明:在3种流体中,体积传质系数均随气体流量的增大而增大,随液相浓度的增大而减小。流体的黏弹性对传质具有抑制作用。基于实验数据,提出了一个新的预测泡群传质系数的经验关联式,在上述3种流体中,该关联式的预测值与实验结果吻合良好。
Mass transfer from CO2 bubbles swarm into ambient liquids is widely encountered in chemical process.The mass transfer process of CO2 bubble swarm in three kinds of fluids（Newtonian fluid,inelastic shear thinning fluid and viscoelastic shear thinning fluid） was studied.The volumetric mass transfer coefficient was measured experimentally by using CO2 probe.The effects of the liquid concentration,gas flow rate and rheological property of non-Newtonian fluid on the mass transfer of bubble swarm were analyzed.The results show that the volumetric mass transfer coefficient increases with gas flow rate,but decreases with the increase of solution concentration.The viscoelastic property of fluid inhibits the mass transfer between gas phase and liquid phase.Based on the experimental result,an empirical correlation for predicting mass transfer coefficient of bubble swarm in liquid was proposed.This new correlation agrees well with the experimental results in three kinds of fluids with different rheological characteristics.
出处
《化学工程》
CAS
CSCD
北大核心
2011年第10期22-25,共4页
Chemical Engineering(China)
基金
国家自然科学基金资助项目(21076139
20476073)
化学工程国家重点实验室开放课题(SKL-ChE-08B03)
关键词
CO2
非牛顿流体
传质
气泡群
流变性质
CO2
non-Newtonian fluids
mass transfer
bubble swarm
rheological characteristics
