高黏度比时挡板结构对心形微通道内流场特性的影响  

Influence of baffle structure on flow field characteristics in heart-shaped microchannels under high viscosity ratio

作　　者：马静静 陈鸿福 刘学鑫 李鹏飞 胡临博 段振亚[1] MA Jingjing;CHEN Hongfu;LIU Xuexin;LI Pengfei;HU Linbo;DUAN Zhenya(School of Mechanical and Electrical Engineering,Qingdao University of Science and Technology,Qingdao 266100,Shandong Province,China;Zhejiang Kejian Safety and Health Consulting Co.,Ltd.,Quzhou 324000,Zhejiang Province,China;Jiangsu Pomegranate Chemical Technology Co.,Ltd.Qingdao Branch,Qingdao 266000,Shandong Province,China;Shandong Xinhua Pharmaceutical Co.,Ltd.,Shouguang 262700,Shandong Province,China)

机构地区：[1]青岛科技大学机电工程学院,山东青岛266100 [2]浙江科健安全卫生咨询有限公司,浙江衢州324000 [3]江苏石榴化工科技有限公司青岛分公司,山东青岛266000 [4]山东新华制药有限公司,山东寿光262700

出　　处：《化学工程》2025年第2期38-43,共6页Chemical Engineering(China)

基　　金：山东省自然科学基金资助项目(ZR2024MB134);山东省科技型中小企业创新能力提升工程(2023TSGC0493)。

摘　　要：由于通道尺寸小以及层流现象,微通道混合始终是一项具有挑战性的任务,尤其是对于2种高黏度比流体,其在混合过程中极易出现分层现象,导致混合不均匀进而影响反应效果。为了改善这种情况,通过改变通道内挡板类型来确定适合高黏度比液液非均相流体的混合结构,使用有限元软件Fluent模拟不同结构微通道内部的液体流动与混合,研究速度分布情况以及压力场和混合均匀性指数的变化规律,详细阐述3种不同挡板微通道内部流场的流动特点,得到不同挡板结构与混合效果及压力差之间的关系。数值模拟结果显示:3种微通道内流速大小为v_(A)>v_(C)>v_(B),压力差分别为Δp_(A)=227560 Pa、Δp_(B)=218633 Pa、Δp_(C)=223621 Pa,可得A型挡板微通道的速度及压力损失最大,表明弧形挡板结构的心形微通道更有利于高黏度比液液混合。微通道的不同挡板结构对高黏度比液液非均相的混合过程具有重大影响,对工程设计及实验具有重要指导意义。Due to the small channel size and laminar flow,microchannel mixing is always a challenging task,especially for two high viscosity ratio fluids,which are prone to layering during the mixing process,resulting in uneven mixing and affecting reaction efficiency.In order to improve this situation,the mixing structure suitable for high viscosity difference liquid-liquid heterogeneous fluids was determined by changing the type of baffle inside the channel.The finite element software Fluent was used to simulate the liquid flow and mixing inside microchannels with different structures,and the velocity distribution,pressure field and mixing uniformity index were studied.The flow characteristics of the internal flow field of three different baffle microchannels were elaborated in detail,and the relationship between different baffle structures,mixing effects and pressure difference was obtained.The numerical simulation results show that the flow velocity in the three microchannels is v_(A)>v_(C)>v_(B),and the pressure difference isΔp_(A)=227560 Pa,Δp_(B)=218633 Pa andΔp_(C)=223621 Pa,respectively.It can be concluded that the A-shaped baffle microchannel has the highest velocity and pressure loss,indicating that the heart-shaped microchannel with an arc-shaped baffle structure is more conducive to high viscosity difference liquid-liquid mixing.The different baffle structures of microchannels have a significant impact on the heterogeneous mixing process of high viscosity liquid,and have important guiding significance for engineering design and experiments.

关 键 词：高黏度比流体 心形微通道 混合效果 数值模拟 挡板结构 

分 类 号：TQ027.1[化学工程]