化工进展2023，Vol.42Issue(12)：6180-6190,11.DOI:10.16085/j.issn.1000-6613.2023-0183
Lightnin静态混合器内气液两相混合与传质强化特性
Enhancement of gas-liquid flow mixing and mass transfer in Lightnin static mixer
摘要
Abstract
The bubble dispersion characteristics were investigated by computational fluid dynamics(CFD)coupled with population balance model(PBM)in the Lightnin static mixer(LSM).Different breakup and coalescence kernels were used to study the effect of Reynolds number(Re),gas volume fraction(αd)and the element numbers on the bubble dispersion behavior and mixing efficiency.Bubble breakup capacity and mass transfer rate were quantized via gas-liquid interfacial area and volumetric mass transfer coefficient(kLa)in LSM and Kenics static mixer(KSM).The distributive mixing performance and dispersive mixing performance of LSM and KSM were analyzed based on CoV and fluid microelement stretching rate.The results showed that Luo coalescence model and Prince model overestimated the bubbles coalescence efficiency in LSM,and the bubble size calculated by the Luo-Turbulent model was in good agreement with the experimental data.With the increase of Re and αd,the dispersion behavior of bubbles in LSM was further strengthened.Increasing the number of elements could significantly improve the gas-liquid mass transfer efficiency at higher Re condition.CoV curve showed that LSM had better distributive mixing performance than KSM,and three LSM elements could make the mixedness more than 95%.The dispersive mixing efficiency of LSM was 1.06 to 1.16 times that of KSM.The critical superficial velocities of flow pattern transition from pseudo-homogeneous to heterogeneous were identified based on pressure fluctuation signal time series in the LSM.关键词
静态混合器/气液两相流/种群平衡公式/计算流体力学/混合Key words
static mixer/gas-liquid flow/population balance equation/computational fluid dynamics(CFD)/mixing分类
化学工程引用本文复制引用
禹言芳,李毓,孟辉波,刘桓辰..Lightnin静态混合器内气液两相混合与传质强化特性[J].化工进展,2023,42(12):6180-6190,11.基金项目
辽宁特聘教授计划(辽教函[2018]35号) （辽教函[2018]35号）
国家自然科学基金(21476142) （21476142）
青岛市自然科学基金(23-2-1-236-zyyd-jch) （23-2-1-236-zyyd-jch）
辽宁省教育厅重点项目(LJKZ0429,LJKMZ20220773) （LJKZ0429,LJKMZ20220773）
辽宁省自然科学基金(2022-MS-290) （2022-MS-290）
中国石油大学(华东)引进人才科研基金(R20220113). （华东）
